Independent Electrical Contractors (IEC) Year 4 Practice Exam

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• External Line Connectors (XLR) are typically used with microphone cable and have between ___ contacts.
• For show window lighting load calculations, which value shall be included for this load?
• What lug temperature rating is specified for the lugs in the described circuits?
• Class I locations are used for hazards involving
• Which statement is true regarding room storage of flammable liquids without an approved cabinet?
• Which organization provides standards referenced with NEC for grounding and bonding of limited energy systems?
• When located, a receptacle is required to be GFCI protected. Which of the following locations are included?
• A(n) ___ is a device that changes AC voltage into DC voltage in a motor drive.
• For the left-side configuration with 4-inch conduits on one row and 2-inch conduits on another, performing a U-pull between two 4-inch conduits on the side, what is the minimum left-to-right length (inches)?
• After identifying hazardous materials on a jobsite, you should plan for which of the following?
• Service entrance cables shall be supported by straps or other approved means within how many feet of every service head, gooseneck, or connection to a raceway or enclosure?
• The NEC is intended to safeguard whom from hazards arising from the use of electricity?
• A garbage disposal in the kitchen of a residence is provided with a type SO three-conductor cord that is terminated with a grounding-type attachment plug. This connection method is permitted where the ___. I. receptacle is readily accessible II. receptacle is located to avoid physical damage to the flexible cord III. receptacle is accessible IV. length of the cord is not less than 18 inches and not over 36 inches. Which of the following sets of conditions apply?
• Refer to Figure 208.51. The minimum calculated dimension for top-to-bottom length of the box is ___ inches. All conductors enter the right side of the pull box and exit the bottom. Conduit G = 3", H = 3 1/2", J = 6", K = 3", L = 4", M = 2", N = 2 1/2"
• Which factors are considered when selecting slings for moving materials?
• Which device handles the logic for each HVAC piece of equipment in building automation?
• A disconnecting means has been installed for an ESS to disconnect it from its associated wiring systems. The disconnect is installed in a separate room from the ESS for accessibility. The handle of the disconnect is required to be ___.
• In field supervision, apprentices are most commonly supervised by
• What is the required exhaust ventilation rate per square meter of floor area?
• Lightning arresters are designed to protect electrical equipment from lightning effects. Which items are protected according to typical protection schemes?
• Which item is not required to be legibly marked on the disconnecting means of an ESS?
• Each patient bed location in Category 1 spaces shall be supplied by at least ___ branch circuits.
• Which body enforces the electrical Code rules and provisions?
• Energized work is permitted if conductors and devices are energized at less than what to ground?
• Box-style cameras are most often used in which setting?
• Which connector is used to connect patch cables to network wiring?
• A(n) ___ cable indicates that the cable jacketing materials are designed to reduce overheating in high temperature areas.
• Which statement about intrinsically safe wiring labeling is true? no more than 25 feet apart.
• PV ___ is an electric power system designed to supply usable solar power by means of photovoltaics.
• An energy management system is permitted to perform which action on busbars and conductors supplied by interconnected sources?
• All appliances require listing for at least how many volts?
• The minimum size conductors permitted to be run between a generator and a distribution panelboard for a 3Ø, 300 kVA generator delivering 480 volts when conductors are run in parallel in two conduits is which of the following?
• ___ is a symptom of CO poisoning.
• Which term best describes the use of automation and controls systems to monitor and control building wide systems?
• Which statement about Type IGS cables is true?
• AC drives can easily vary the speed of a motor.
• A transceiver ___ radio frequency signals.
• Which statement about refrigerators and circuits is correct?
• For a box with conduits G=2, H=2.5, J=1.5, K=2, L=1, M=1.5, N=2 (inches), what is the minimum left-to-right length (inches)?
• In most organizations, ___ are supervised.
• Exposure to loud noises can cause ___.
• When adding loads or drives to a system with an existing AC motor drive, what should be checked?
• Triplen harmonics are divisible by 3 and cause problems on which circuits?
• In a one-family dwelling, an ESS shall not exceed ___ volts DC between conductors or to ground.
• Individual dry-type transformers rated over 112½ kVA shall be enclosed in a fire-resistant room with materials having a ___-hour minimum fire rating.
• Kilowatt-hour is a unit used to measure which quantity in EV charging?
• Flexible cords ___ AWG and larger are used to supply approved appliances and are considered protected from overcurrent by overcurrent devices.
• NEC® Article ___ covers cables for power-limited circuits.
• What is the minimum top-to-bottom length, in inches, for the pull box under the described side-to-adjacent side conduit arrangement?
• Shoring of a trench excavation prevents which hazards?
• When conductors are pulled from 2-inch side conduits into the 6-inch conduit on the bottom, what is the minimum distance between the 6-inch conduit and the bottom 2-inch conduit (inches)?
• What is the feeder demand in amps for a 70' × 50' office that is accessible to pedestrians? The office has 25 feet of show window and a connected lighting load of 3,200 VA. All lighting, including any show windows and signs, is continuous. The panel supplying the feeder is 120/240V 1-phase 3-wire.
• Conductors smaller than 1/0 AWG can be connected in parallel to supply control power provided which conditions are met?
• NFPA 70E® Article ___ covers the requirements for working on or near energized electrical circuits, systems, or parts.
• When voltage taps other than the rated taps are used, the number of turns on that winding is increased or decreased because ___.
• Transformer vaults shall be constructed of materials with a minimum fire resistance of how many hours?
• When working on a ladder, your body should not extend ___ the ladder's side rails.
• Statement: A transformer rated 25 kVA or larger must have a nameplate that includes the impedance.
• Most states require at least ___ hours of on-the-job experience before applying to take the journeyman electrician's exam.
• Which statement correctly identifies the transformer voltage relationship described as 7200 to 4160 V?
• In a PVC conduit carrying three circuits: 12 AWG conductors on a 20-A breaker, 8 AWG conductors on a 50-A breaker, and 6 AWG conductors on a 60-A breaker, what is the smallest EGC permitted to be installed in the conduit?
• Which statement about the output voltages in the standards is correct?
• Which of the following is not typically a port of a VFD?
• Electric vehicles have ___ charging ports, which means it can only be plugged into a charging station with a compatible connector.
• A 240-volt, single phase fused disconnect that feeds a motor is being tested. Readings: Load side of Fuse A to ground - 0 volts; Load side of Fuse B to ground - 0 volts; Load side of Fuse A to load side of Fuse B - 0 volts. With 100% certainty, what is the state of both fuses?
• Electromechanical devices can tolerate transient voltages of several times their ratings for a short period of time.
• Which term describes the healthcare facility power system that provides power to designated areas during disruption and minimizes disruption within the wiring?
• Access gates to suspended personnel platforms can open inward.
• Which of the following is NOT a typical application for a PLR?
• If an SPD and a lightning arrester are both installed at a service entrance switchboard and a surge occurs, which device will do all the work to handle the surge current?
• Which term describes a power system that can automatically disconnect power when a fault is detected?
• An AC drive controls the torque of an AC motor by varying the ___ applied to the motor.
• Connection from any grounding conductor of the type FCC cable shall be made to the shield system at each ___.
• At home, the ___ connector is used to charge any non-Tesla electric vehicle.
• If a single conductor in a Class A fire alarm system breaks, what happens to the pull stations?
• If you encounter an unexpected voltage during troubleshooting, what should you do first?
• Not more than ___ gallons of flammable liquid shall be stored in any one approved storage cabinet.
• A hallway that is 17 feet long requires at least how many receptacles?
• Which term refers to devices also described as nano-PLC, micro-PLC, or smart relay?
• Terminations in this setup are rated at what temperature?
• A(n) ___ is a variable-resistance electric device that divides voltage proportionally between two circuits.
• When a tripped breaker is found, what is the proper action?
• Which of the following is not a character trait?
• According to the NEC, which two branches are mandatory in a hospital's essential electrical system?
• An OTDR is not as accurate as the optical attenuation test set for measuring loss.
• Which of the following statements about eye protection for fiber optics is correct?
• What is the primary purpose of an equipment grounding conductor?
• Changes must be made to construction site emergency action plans when ___.
• ___ has the power to grant special permission, often involving exceptions to NEC® rules or other customary guidelines.
• Lightning arresters protect which components from lightning effects?
• In a vertical raceway, 1/0 AWG copper conductors must be supported at intervals not exceeding how many feet?
• When two or more power production sources are operating in parallel with a primary source of electricity they shall have compatible ___.
• Four 500 kcmil conductors are installed from the transformer to the 400-A panel. The minimum size equipment grounding jumper for the FMC between the transformer and the 120/208-volt panel is which AWG or kcmil?
• Where installed in raceways, conductors of size ___ AWG and larger shall be stranded.
• Refer to the partial cable layout for a receptacle shown in Figure 128.122. When 14 AWG AC cables (without insulated ground) are installed, what is the smallest box listed below that can be used? The box contains the duplex receptacle and Circuits B9-11 feed the outlets. Cable connectors are external.
• On a 120/240 V split-phase service, what is the voltage from phase to ground for either hot leg?
• In metal raceway installations, feeders sharing a common neutral must be installed in which manner?
• An output that can be configured for either digital or analog through software is called?
• Using the standard calculation method, what is the general lighting and receptacle minimum unit load (line and neutral) for a 3,200 sq-ft one-family dwelling with two small-appliance branch circuits and one laundry branch circuit?
• Which boundary term is used to describe the boundary that is treated as direct contact if violated?
• Which battery chemistry is described as having a longer life cycle than lead-acid batteries?
• Interior stairway lighting outlets in dwellings shall be controlled by a wall switch at each floor level where the difference between levels is ___ steps or more.
• The NEC requires bonding of switchboards and panelboards used as service equipment.
• Outdoor receptacles located in damp locations require enclosures that are...
• ANSI has detailed requirements for the ___ permitted to be used on safety signs.
• Before use, a wire rope sling should be checked for ___.
• Fire pump supply conductors on the load side of the final disconnecting means and overcurrent devices shall be permitted to be routed through a building if they are ___.
• For a set involving thirty-four 8 AWG, twenty 12 AWG, nine 6 AWG, and one 10 AWG THHN/THWN conductors in EMT between two junction boxes, which is the correct minimum size?
• The standard rating of the overcurrent protection device supplying a 240-V, 60-A electric vehicle charger should be ___.
• Which practice improves ladder safety?
• In a 120/240-volt, single-phase, 3-wire transformer-fed panelboard, circuit number 34 is connected to which conductor?
• A simple example of an 'XIO' operator would be ___.
• The jack or terminal that serves as the collection point for redundant grounding of electrical appliances in a patient care vicinity is called which?
• The most common cause of arc flash and other electrical incidents is ___.
• Which statement about accident reduction on jobsites is true?
• Which of the following is not typically listed on the transformer nameplate?
• Which of the following statements describes PV modules in terms of labeling when intended for use in PV systems?
• UF cable ampacity is based on conductors rated at what temperature?
• AC charging is the most common type and includes ___ charging in North America.
• Between a 2-pole, 20-amp circuit breaker and a load, 10 AWG 2-wire AC cable is installed. This circuit has a rating of ___ amps.
• When the service disconnection means consists of two to six service disconnects, they are required to be ___.
• A supervisor must be able to relate to several ___ of workers.
• Conduit used in limited energy installations can be which of the following?
• Most burns from electrical accidents are caused by ___.
• Any single cord-and-plug-connected utilization equipment connected to a 20-amp branch circuit not fastened in place shall have a maximum rating of ___ amps.
• Arc flash burns that occur outside the arc flash boundary are not likely to be which type of burn?
• ___ is a general term including fittings, devices, appliances, luminaires, apparatus, machinery, and the like used as a part of, or in connection with, an electrical installation.
• Taps are short conductors used to connect a feeder to which of the following?
• What is the minimum dimension for Y in inches?
• A kitchen has a cooktop rated 4 kW at 240 V and two ovens rated 5.5 kW at 240 V. What is the minimum load for this branch circuit in watts?
• Under the optional calculation method, the multifamily dwelling is permitted if which conditions are met?
• In systems where two or more sources operate in parallel with a primary source, the sources must have compatible frequency, voltage, and waveform.
• Under 230.95, the rating of the service disconnecting means is the rating of which component?
• An energy management system shall be permitted to ___ on the busbars and conductors supplied by the output of one or more interconnected electric power production or energy storage sources.
• The conductors connected to Switch 1 and extend into the wireway are best described as ___ conductors.
• Which statement best describes the optional method's approach to dwelling unit loads?
• Which of these causes more accidents on a jobsite?
• In Scenario 230.26, the smallest branch circuit conductors that can be installed between the 1-pole circuit breaker and the motor are which AWG?
• Outdoor receptacles must have which protection?
• A 400-A service not subject to physical abuse, the GEC to the ground rod must be at least ___ AWG.
• Safe work practices for suspended personnel platforms include which actions?
• A 60-gallon boiler rated 8.2 kW at 240 V, 1-phase requires a minimum size THHN/THWN copper wire between the required disconnect and the boiler of which gauge?
• An ANSUL system is a type of ___.
• For outlets installed to supply power to EVSE rated greater than 16 amps, the outlet must be supplied by which type of circuit?
• The smallest branch circuit conductors that can be installed between the 1-pole circuit breaker in a 120/240-volt, 3Ø, 4-wire panelboard and the motor are which AWG? Terminations are rated at 75°C.
• Which load category is described as correcting harmonics within the device, exemplified by low THD rectifiers?
• What is the primary function of a plenum in HVAC systems?
• Conductors installed in concealed raceways are considered ___.
• Which equipment is designed to protect electrical systems from transient overvoltages?
• Which of the following could be used in a concrete slab?
• Type SE service-entrance cables shall be permitted in interior wiring systems where all the circuit conductors of the cable are of the ___ type.
• If laid in notches in wood studs, joists, rafters, or other wood members, ___ shall be protected against nails or screws by a steel plate at least 1/16" thick.
• Compared to a wiremap tester, a TSB-67 Compliance Tester measures more parameters.
• For voltages 1000 V or less, the spacing of open service conductors in dry locations is 2 1/2 inches. Which option represents this spacing?
• What is the total nameplate load (in kW) of a kitchen with a 4 kW cooktop, two 5 kW ovens, and a 3.5 kW broiler?
• When a single-car garage is attached to a house, the NEC requires that the garage have at least ___ receptacle(s) installed inside the garage.
• UF cable shall be permitted for ___.
• Which method reduces light intensity in a space based on lighting level recommendations from the Illuminating Engineering Society?
• Which statement correctly describes the service configuration for the 50-unit apartment complex with 4 kW dryers?
• Three-phase chargers are rated at around 22 kW.
• A junction box has 12 inches of length and must accommodate a straight-pull installation with 4 AWG conductors. What is the largest raceway size, in inches, that can be installed?
• Hearing loss is affected by ___.
• A temperature gun is best described as a device that measures temperature from a distance without direct contact.
• Which description best defines a 'competent person' in trench safety?
• An 8 in by 8 in by 5 ft gutter will hold up to a maximum number of 4/0 THWN/THHN conductors. How many can be installed?
• Feeder conductors are defined as the conductors that connect the service equipment to the distribution equipment.
• For a transformer with 4% impedance that feeds a fused safety switch, the maximum fuse rating in the switch is 150 A. Which set of options correctly reflects this configuration?
• A VFD is used to control which type of motors?
• When calculating the total load of an office building and the number of general purpose receptacles is unknown, an additional load of ___ VA per square foot is required for the receptacles.
• Mating connectors for PV equipment shall be polarized and shall have a configuration that is ___ with receptacles in other electrical systems on the premises.
• Which description best fits sudden cardiac arrest?
• Which standard is used to determine arc flash boundary?
• Which statement is true about gloves in hand injury prevention?
• The person providing safety training should spend ___ to train a new employee.
• Which battery chemistry is typically noted for recyclable components?
• Which motor has the shortest tap length from the gutter to the switch?
• Service-entrance conductors must have an ampacity greater than or equal to the rating of the service disconnect.
• Which statement about marking equipment in multi-source systems is correct?
• A 240-volt, single phase fused disconnect that feeds a motor is being tested. Meter readings indicate: Line side A to line side B - 240 volts; Line side A to load side B - 240 volts; Line side B to load side A - 0 volts; Load side A to ground - 120 volts; Load side B to ground - 120 volts. With 100% certainty, what is the state of both fuses?
• In a 480Y/277 V system, what is the voltage between any phase and neutral?
• Accident prevention tags are used as which type of warning?
• When bending Type NM cable, the tightest bend permitted by the NEC has a radius of ___.
• Which voltage conduit size is correct for eight 6 AWG XHHW conductors?
• Single-phase chargers typically range from 7.2 kW to 11 kW.
• Which standard is widely used for interoperability in building automation networks?
• Category Cable ___ is the best choice to use where high performance is required.
• The component of a fire alarm system that processes inputs from detectors and initiates outputs is the
• Which statement best describes NEC Chapter relations: Chapters 5-7 relate to special occupancies and conditions along with special equipment.
• According to the reading material, most state licensing exams are between ___ hours long.
• Which system commonly provides 277 V as the phase-to-neutral voltage?
• A permitted wiring method for direct-current turbine output circuits installed inside a building from where it enters the building to the first disconnecting means includes.
• Refer to the nameplate shown in the example. The largest circuit breaker you could install is ___ A.
• The minimum dimension permitted for Y is ___ inches.
• What is the tap length for Motor #1?
• Continuous duty motors with a marked service factor not less than 1.15 shall have the minimum running overload protection sized at ___ percent of the nameplate rating of the motor.
• For a transformer vault located on the 2nd floor of a high-rise building, the minimum height of an oil-confining sill below the door into the vault is how many inches?
• A motor is controlled by a start/stop station. If the operator pushes the start button and the contactor energizes but the motor does not run. This is most likely a ____ problem.
• A one-line diagram for a power distribution system is used to determine ___.
• Which class of fires involves combustible metals?
• What is the maximum height above the floor for the center of the grip of the operating handle of a switch or circuit breaker in the highest position?
• The 120-volt circuit supplying power to a fire alarm system must be dedicated. This means it must be on a separate branch circuit serving no other loads.
• ___ is a general term including fittings, devices, appliances, luminaires, apparatus, machinery, and the like used as a part of, or in connection with, an electrical installation.
• Which statements are required to prevent water from entering service equipment?
• For Motor #1, the smallest circuit conductors between the wireway and the safety switch (75°C terminations) are which AWG?
• Which signal should be used to stop a traveling crane immediately in an emergency?
• PV conductor ampacity corrections are required when ambient temperatures exceed ___°F.
• What is the sum, in inches, of diameters G, H, and N?
• Harmonics on a power system may cause which effects?
• Regarding bleeding control in first aid, which statement is correct?
• In a 5-foot deep trench, a ladder or other safe means of getting out must be available within how many feet of your working location?
• As it relates to rapid shutdown of a PV system, the term array boundary is defined as ___ inches from the array in all directions.
• High Density Polyethylene (HDPE) conduit larger than ___ shall not be used.
• A delta-connected three-phase system typically has no neutral conductor.
• Which NEC® article covers solar PV systems?
• If it is determined that there would be no increased exposure to electrical burns or explosion, then energized conductors and devices operating at less than 50 volts would require which action prior to performing work on the circuit?
• Are stairwells required to have visible evacuation signals?
• Where a delta bank of three transformers is installed to serve a load that is comprised mostly of 120-volt loads, all three transformers must be the same size.
• A multi-layer flash suit rated at 4 cal/cm2 should be worn in which hazard risk category?
• Which term describes a brief decrease in voltage lasting less than a cycle?
• For 1/0 AWG copper conductors in a vertical raceway, the maximum support interval is 100 feet.
• Which concept maximizes occupant health and comfort by using natural lighting to reduce energy consumption and stress on the eyes?
• Which location is required to have electrical installations comply with the NEC?
• NEC Sections 422.30 through 422.35 allow which of the following disconnecting means for fixed appliances not over 300 VA or 1/8 horsepower?
• In a 208/120 V, 3-phase, 4-wire system, what is the voltage between the neutral and the ground?
• Temporary electric power and lighting installations shall be permitted for a period not to exceed ___ days for holiday decorative lighting and similar purposes.
• A simple example of an XIC operator would be ___.
• Which of the following is NOT an example of process manufacturing?
• A 15-amp, single-phase circuit runs from the panel to a bedroom and only energizes all the receptacles and the incandescent light in that bedroom. Assuming proper wiring, what voltage reading is plausible when you measure the line side of switch to load side of switch? (switch is off)
• To operate a TMH manufactured by Terex, you must be trained to operate a ___ TMH.
• Overcurrent protective devices shall be so selected and coordinated as to permit the circuit protective devices used to clear a fault without extensive damage to the electrical components. This fault shall be assumed to be ___.
• What is the sum of the minimum dimensions for X (24 inches) and Y (12 inches)?
• When an electrically operated trash compactor is cord-connected, the maximum permitted length of the cord is ___ inches.
• Which of the following is not a true statement concerning an equipment grounding conductor?
• Emergency action safety planning for a construction job should begin ___.
• Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the available fault current ___.
• A 45 kVA, 480 to 208Y/120-volt dry-type transformer is suspended below the ceiling of an equipment room where the ceiling is plywood attached to wood joists. The minimum clearance from the transformer to the ceiling is:
• PoE lighting circuitry is susceptible to ___, so using shielded cable will help to reduce it.
• In a 480/277 V system with a 600 V disconnect, what voltage is read between the line side of the B fuse and the load side of the C fuse when the disconnect is on?
• How many basic mounting methods exist for PV installations?
• For 125-volt, single-phase, 15- and 20-amp receptacle outlets built into a 15-kW or smaller portable generator, these receptacles shall ___.
• Which conductor is typically bonded to earth to establish a reference potential?
• Reflected laser beams ___ pose the same dangers as direct beams.
• What does the interrupting rating of a circuit breaker indicate?
• Which statement about plug-in hybrids relative to all-electric travel is true?
• For listing requirements, appliances supplied at least which voltage must be listed?
• What is the sum, in inches, of diameters J and K?
• Which statement about PV disconnect location is correct?
• Section ___ in the NEC® specifies that kitchen countertop receptacles in a house are to be GFCI protected.
• Which statement is true about a receptacle for a drinking fountain?
• For a 400-A main panel with a 600 kcmil feeder, the smallest grounding electrode conductor to the ground rod (not subject to physical abuse) is ___ AWG.
• When the motion of a traveling crane is to be slowly made, you should signal by which gesture?
• Refer to the setup where Load #1 will draw 63 amps. The smallest size for the tap conductors between Pull Box 2 and the Fused Disconnect for Load #1 is which AWG?
• A PV isolating device shall be permitted to be a finger safe ___.
• Where used in a control circuit, relay coils are connected to the ___ terminals on a programmable controller.
• Temporary electric power and lighting installations shall be permitted during the period of construction, remodeling, maintenance, ___, or demolition.
• The maximum ampacity of a 500 kcmil, integrated gas spacer cable (Type IGS) is ___ amps.
• Which of the following is not a notification device?
• Lighting tracks that are four feet or less in length must be fastened at a minimum of how many places?
• These hazards can catch fire easily and normally have a flash point of 100 degrees Fahrenheit or below.
• When a safety switch (disconnect) is installed for a piece of equipment, the maximum height of the switch handle when in the 'on' position is ___.
• What is the difference between the minimum dimensions for X and Y?
• Five 1 AWG and five 3 AWG copper THW conductors in a 20-foot IMC raceway require a minimum trade size of what?
• A NEMA Type ___ enclosure provides a degree of protection against windblown dust.
• In AC circuits with ground-fault protection of equipment, the output of interconnected power production equipment must be connected to which side of the ground fault protection equipment?
• For temporary installations, receptacles must be of the grounding type. Which of the following statements is also true?
• Which hazard class rapidly releases energy through chemical reactions?
• Which organizations publish non-NEC standards for electric vehicle charging equipment?
• Harmonics on a power system may cause nuisance tripping of circuit breakers. This statement is:
• Most of the transformers used outside the United States and Canada are designed to operate at ___ Hz.
• Using Table 4 in Chapter 9, which 2-inch raceway has the smallest cross-sectional area?
• ___ injuries are a common result of working overhead.
• All of the following copper wires are to be installed in an electrical metallic tubing that is 10 ft long. What is the minimum trade size of EMT required?
• Trade size 3/4 Schedule 40 PVC conduit shall be supported at a minimum of every ___ feet.
• For fixed multioutlet assemblies where a number of appliances are likely to be used simultaneously, a load of 180 VA for each ___ ft. shall be included in the calculation.
• Fire alarm devices must be grounded in accordance with Article 250 of the NEC®.
• Which data on a motor nameplate determines the maximum size of the overcurrent device for a 3-phase motor?
• The ___ boundary is the approach limit for unqualified individuals to reduce the risk of contact with an exposed energized electrical conductor or circuit part.
• ISO 50001 aims to improve energy use through what type of system?
• ___ is a method used to reduce noise levels on construction sites.
• Where not subject to physical abuse, the smallest permitted GEC to the ground rod from Panel LC is ___ AWG.
• Turret style cameras are often referred to as ___.
• In a poured concrete grade beam, what is the maximum size GEC required from the service equipment to the rebar in the bottom of the grade beam?
• Electric arcs can heat the surrounding air to a temperature of around ___°F.
• When a forklift is parked, which statements are correct?
• Arc flash hazards are broken down into how many Hazard Risk Categories (HRC)?
• The minimum unit load for a multifamily dwelling must not be less than how many VA per square foot?
• Energized parts within control cabinets used for fire pump systems shall be ___.
• PoE is most cost-effective when it is implemented during ___.
• Which of the following can be symptoms of an impending heart attack?
• Feeder conductors for new restaurants are not required to be of ___ ampacity than the service-entrance conductors.
• Which boundary is designed to prevent a worker from coming into contact with exposed energized parts?
• The 5-gang box partitions question: The NEC requires partitions be installed between which adjacent switches?
• A refrigerator may be supplied by a separate 15-amp circuit. Which NEC citation allows this?
• Overhead garage door receptacles must be protected by GFCI according to which NEC provision?
• Except where ___, flexible cords shall not be used unless specifically permitted.
• Utilities will require a(n) ___.
• The phase conductors of a 400-amp circuit are divided into two parallel raceways. The NEC requires which of the following copper EGCs?
• When conductors are laid in notches in wood studs or similar members, what protection is required against nails or screws?
• If a candidate has 8,000 hours of unlicensed full-time work experience, does this meet the eligibility criterion for the license without apprenticeship?
• Which of the following is an example of an OUTPUT?
• Which device is used to locate the point where a fiber is broken?
• Two duplex receptacles are installed in a double-gang box. The total minimum receptacle load for all receptacles is what value in VA?
• Which combination is considered service equipment?
• Supervisors should be aware of ___ in the field to help coworkers stay informed of current technology.
• If a 4-point saddle requires 240° of bend, which 3-point saddles can be used?
• The largest 2-pole circuit breaker that can be used to protect a 12 AWG copper Type SJO flexible cord serving a single-phase load is ___ A.
• An overcurrent device protecting service conductors for a single load may be locked or sealed to prevent ___ .
• When not in use, a laser should be ___.
• Lamps and lampholders for fixed lighting located over lanes through which vehicles are commonly driven shall be located not less than how many feet above the floor?
• What is the maximum permitted OCPD to be installed for a single 120V branch circuit supplying two sign outlets that operate continuously each day?
• For temporary installations, the NEC® requires that receptacles be ___.
• GFCI protection is required for all receptacles in commercial repair garages that use electrical diagnostic equipment, electrical hand tools, or portable lighting with respect to which receptacle configurations?
• In reliability and maintenance metrics, what term describes the initial value used to compare future measurements?
• In PLR programming, two switches in series are described as which?
• When thunderstorms are in the area, aerial lift operations should be which of the following?
• Determine the minimum standard size wireway required for a job. A section of wireway will contain thirty-two 3 AWG, forty-eight 2 AWG, and eighteen 3/0 THHN/THWN conductors.
• If it can be demonstrated that a greater hazard is created by de-energizing the conductors and circuit parts to work on an energized circuit, then it would require ___ prior to performing work on the circuit.
• What information must be included on the nameplate of a transformer?
• An energized electrical work permit is required for which of the following activities while working on energized equipment?
• An example of a rack type used in limited energy systems is which of the following?
• For interconnected sources, the feeder ampacity must be at least what percent of the power source output current?
• What is the voltage rating of the transformer bank used to feed the 42-Circuit Panelboard HB?
• Which hazard type is associated with a large release of energy during a chemical reaction and requires careful handling to avoid explosion?
• Which statement best describes an OTDR's primary use?
• A metal box or terminal fitting having separately bushed holes for each conductor shall be used whenever change is made from conduit to ___.
• The ___ is a system comprised of alternate sources of power and all connected distribution systems and ancillary equipment, designed to ensure continuity of electrical power to designated areas and functions of a healthcare facility during disruption of normal power sources, and also to minimize disruption within the internal wiring system.
• Which class of fires are kitchen fires primarily involving cooking grease and fats?
• To ensure your safety when assigned to a new jobsite, you should determine ___ on this site.
• Recessed incandescent luminaires must have thermal protection and must be marked.
• The force command is used primarily ___.
• A complete, environmentally protected unit consisting of solar cells and other components designed to produce DC power is known as a PV ___.
• In a conduit with 9 conductors, the wire to Load #3 is 6 AWG, the wire to Load #2 is 1 AWG, and the wire to Load #1 is 2/0 AWG. Each of the loads is 3Ø, 3-wire. In the high-temperature area where the temperature is 133°F, how much current can the wire to Load #3 carry?
• A 175-A service with 2/0 AWG service conductors; the minimum MBJ size is ___ AWG.
• Triplen harmonics are odd harmonics divisible by 3 and are problematic on which circuits?
• In a dwelling, what is the minimum width of a wall space that requires a receptacle outlet?
• Service-drop conductors shall have a minimum of ___ feet vertical clearance from final grade over residential property and driveways and commercial areas not subject to truck traffic where the voltage is limited to 300 volts to ground.
• The term for incident energy that results in a second-degree burn in 6 cycles or 0.1 seconds is ___.
• Which tool is used to locate breaks in fiber by emitting visible light?
• Panelboards equipped with snap switches rated at 30 amps or less shall have overcurrent protection rated at not more than ___ amps.
• What is the first step if you encounter a person who has collapsed and is breathing abnormally?
• Which option describes the purpose of bonding the neutral to the equipment grounding conductor?
• The minimum feeder-circuit conductor size, before the application of any adjustment or correction factors, shall have an allowable ampacity equal to or greater than the noncontinuous load plus ___ percent of the continuous load.
• Personnel platforms suspended by cranes or derricks can be used ___.
• Where interconnected electric power production sources are connected on the load side, equipment containing ___ devices in circuits supplying power to a busbar or conductor supplied from multiple sources shall be marked to indicate the presence of all sources.
• Which phenomenon results from contact of dissimilar metals in an electrical system?
• Which statement describes a Class I, Division 2 location?
• Service conductors installed as open conductors shall have a clearance of not less than ___ ft from fire escapes.
• Determine the minimum ampacity of conductors serving a continuous duty, Design B, 3-phase, 208-volt, 10 hp, induction-type motor.
• AND logic uses ___ switch contacts for connection to programmable controller input terminals.
• PVC shall not be permitted where ambient temperature exceeds ___ unless listed otherwise.
• In a 277/480-volt, 3Ø, 4-wire utility transformer bank feeding a panelboard, which phase is circuit 40 connected to?
• Which of the following is a personality trait?
• The minimum size underground service-lateral conductor shall not be smaller than ___ AWG copper or ___ AWG aluminum.
• Various manufacturers refer to a PLR as a ___.
• Which PV isolating device is permitted?
• Under the optional method, the 30-unit water heater scenario yields 19.8 kW. Which of the following is true about this result?
• A PLR is a solid-state control device that contains ___.
• Wall-mounted strobes must be mounted between ___ and ___ above the finished floor level.
• Which term is the measure of the amount of signal interference from one pair into the pair next to it in the same cable?
• According to NFPA 70E® 110.5(I), qualified personnel must perform a(n) ___ in order to work on exposed electrical conductors or circuit parts that are energized.
• What is the minimum branch-circuit demand for one wall-mounted oven with a nameplate rating of 20A at 240V?
• What is the minimum conductor size for a branch circuit supplying thirteen lighting fixtures rated at 1.25A at 120V each, retrofit LEDs draw 90W total per fixture, and run 10 hours daily?
• Five pieces of kitchen equipment in a restaurant would have a feeder demand factor of ___ percent.
• A surge-protection device on a feeder is required in all of the following locations except for which?
• Which code sections deal with grounding provisions for nonmetallic boxes?
• In Scenario 230.26, non-time-delay fuses with a maximum permitted rating installed in the safety switch would be rated at how many amperes?
• The surface supporting a forklift must be rated to support the weight of the load and the lift.
• The voltage at a fire pump controller's line terminals shall not drop more than ___% below normal (controller-rated voltage) under motor starting conditions.
• Where used in a control circuit, horns and sirens are connected to the ___ terminals on a programmable controller.
• Combustible material adjacent to luminaires cannot be subjected to temperatures exceeding which value?
• ___ allow for the termination of the copper cables into a jack, which is then clipped into a faceplate that holds the jack in its location on the wall.
• Ground controls can be used to operate a boom-supported lift during which circumstance?
• What is the total nameplate load (in kW) of three ovens rated 6 kW, 8 kW, and 3.5 kW, plus a cooktop rated 6 kW?
• Leather protectors are worn over rubber insulating gloves to prevent damage to what?
• When a cord-connected window air conditioner is the only connected load, the current drawn shall not exceed what percent of the branch circuit rating?
• The first impression at a safety meeting is primarily influenced by the supervisor's...
• A single-axis tracking system is more expensive than a typical fixed-tilt or roof-mounted array but can generate ___% more energy.
• A listed ___ shall be installed between a wind electric system and any loads served by the premises electrical system.
• Determine the conductor ampacity given the following: conductors are 500 kcmil THWN copper; ambient temperature is 125°F; eight current carrying conductors are in the raceway.
• A 2-pole, 20-amp circuit breaker connected to 10 AWG 2-conductor cable yields a circuit rating of ___ amps.
• Companies with a good ___ of supervision and a great chain of command typically outperform those who do not.
• There are ___ PoE type designations.
• When the manual shutdown button on a wind turbine is operated, it shall result in a parked turbine state that shall ___.
• Which test result would most strongly indicate that the transformer's neutral is not bonded within the transformer?
• A demand factor of ___% may be applied to the nameplate ratings of four or more fastened-in-place appliances in a one-family dwelling.
• When troubleshooting programmable controller modules, voltage can be measured using a ___.
• In a 120/240V single-phase, 3-wire system, a subpanel is fed with which configuration?
• Under the optional calculation method for a dwelling unit, which statement about the neutral conductor is true?
• What is the primary purpose of a UPS?
• If the EVSE nameplate rating is 6800 VA, which value is used for service/feeder calculations?
• Before use, a fiber rope sling should be checked for ___.
• For a fixed multioutlet assembly with an 18-foot run, how many outlets count toward the load calculation?
• In the context of hydraulic telescopic material handlers, when the boom is extended, the load capacity tends to:
• For the example with four 500 kcmil conductors and one 1/0 ground on a wooden pole 20 feet tall, what is the minimum Schedule 80 PVC trade size?
• Mating connectors for PV equipment shall be polarized and have a configuration that is noninterchangeable with receptacles in other electrical systems on the premises.
• For wireless power transfer equipment, the primary pad base plate shall be of a nonferrous metal and shall be connected to the circuit ___.
• Among common conduit options, which is nonmetallic?
• Which NFPA standard covers fire alarm system testing and maintenance?
• What is the minimum trade size EMT permitted to be installed between two junction boxes that are 5 inches apart, if the run contains thirty-four 8 AWG, twenty 12 AWG, nine 6 AWG, and one 10 AWG THHN/THWN copper conductors?
• You are ___ times more likely to be injured during your time off than when working.
• When slings are utilized to move materials, the slings are selected based on ___.
• Installation instructions for one manufacturer's firestopping products ___.
• Public charging stations are considered ___.
• In pull boxes or junction boxes, when any dimension exceeds what length must conductors be cabled or racked in an approved manner?
• For a 400-A circuit with two parallel raceways, the copper EGC arrangement required is two of which gauge, one in each raceway?
• Referencing a motor feeder from a 120/240-volt, 3Ø, 4-wire panelboard, what is the smallest conductor size allowed for that feeder?
• Service-drop clearance from final grade over areas not subject to truck traffic when voltage is 300 V to ground is at least how many feet?
• What is a recommended laser safety placement to reduce exposure risk to workers?
• Toxic materials may include which of the following?
• If a high-leg is present, it should be connected in the switch so that it is protected by Fuse ___.
• Refer to the nameplate shown in the example. The largest fuse you could install in a fused safety switch is ___ A.
• What does the term incident energy quantify in arc flash terms?
• Which of the following is an ungrounded conductor?
• In temporary installations, receptacles shall not be connected to the same ungrounded conductor of multiwire circuits that supply ___.
• ___ rating is the highest current at rated voltage that a device is identified to interrupt under standard test conditions.
• A(n) ___ inverter connects or interacts with the grid.
• The secondary side of a 480/277 volt to 208/120 volt transformer feeds a panelboard. The readings show varying phase-to-ground voltages and phase-to-neutral voltages around 120 V, with Neutral to Ground at 54 volts. Is the transformer operating normally? If not, what is a possible reason why?
• Which statement describes the licensing eligibility requirement that involves hours and licensing status?
• A metal switch enclosure installed in a damp or wet location shall be spaced at least ___ inches off the mounting surface.
• Which option is true about the number of 4 AWG THHN conductors in 11/2" RMC?
• When a receptacle provides power for an electric drinking fountain, the receptacle must be
• To settle a Code enforcement issue between an inspector and a contractor foreman, the ___ would have the final say.
• Which device is primarily responsible for diverting surge energy away from protected equipment at the service entrance?
• Although lasers are to be set up so that the beam is above the heads of workers, caution should be exercised to protect your sight when working ___ in an area where lasers are operating.
• The rapid shutdown label's title typography applies to which option?
• Which of the following best describes service-entrance conductors?
• A liquid with a flash point greater than or equal to 140 degrees F is called which?
• Which of the following poses the greatest hazard when working in a trench excavation?
• It is safe to blindly reach into a toolbox.
• XIO input in ladder logic is represented by which contact?
• An end-of-line resistor is used to ___.
• In Class I Division 1 locations, Group C equipment, threaded joints shall be made up with at least how many threads fully engaged?
• Statement I: All conductors of the same circuit and, where used, the grounded conductor and all equipment grounding conductors and bonding conductors shall be contained within the same raceway, cable, or cord. Statement II: Equipment grounding conductors shall be permitted to be installed outside a raceway or cable assembly. Which of the following best describes mandatory Code language?
• Conductors in the conduit between service equipment and a load are which type of conductors?
• Which of the following is true about green main bonding jumper screws in panels?
• Ladders should be inspected ___.
• Which term among the inverter options is not a standard inverter type described in PV systems?
• The statement 'Most solid-state devices are designed to tolerate transient voltages of several times their ratings for a short period of time' is:
• A turbine is to be disabled for installation and service by means of.
• The industry standard for a PV module is ___.
• A transformer vault floor in direct contact with the earth shall be constructed of at least how many inches of concrete?
• ___ can be connected to the input terminals of a programmable controller.
• How many 20-amp 120V lighting branch circuits are required for a 5,500 square-foot retail store?
• These hazards can cause biological damage to body tissues from overexposure.
• In a system where a 4160 to 2400 V three-phase transformer is fed by a feeder through a circuit breaker in a main distribution panelboard, and the transformer is 45 kVA with a 3% impedance, what is the maximum feeder circuit breaker size allowed by NEC 450.3?
• In NEC Table 300.5, what term is defined as the shortest distance between the top surface of any direct-buried conductor, cable, conduit, or raceway and the top surface of finished grade?
• Why is equipment listing by a qualified electrical testing laboratory important?
• Why is an inverse-time circuit breaker used with motors?
• Which combination correctly identifies a type of programmable controller?
• A receptacle that is part of the essential electrical system may require which designation for safety and identification?
• Which statement completes the following: service heads shall have conductors of different potential brought out through separately ___ openings?
• Labeling requirements per NEC Articles 690 and ___ are extensive and provide safety warnings, inverter information, and array information.
• The minimum height permitted for dimension '?' on the drawing, where conduits are 4 in Schedule 40 PVC and contain four 600 kcmil conductors, is ___ inches.
• Where a multifamily building provides a laundry facility on the premises to all occupants, the required laundry receptacle in each individual dwelling unit is:
• In Scenario 230.26, what is the panelboard configuration?
• In a 2,500 sq ft dwelling using the optional method, the general loads total is 17,040 VA. Which of the following represents this value?
• For a 10-unit multifamily dwelling, ___ VA portion of the calculated lighting load is taken at 100% in the general lighting demand.
• Programmable controllers ___ contain a battery backup.
• A 7200 to 4160 V three-phase transformer 150 kVA in a supervised location is fed from a feeder tap protected with a three-phase fused safety switch. The transformer powers a circuit breaker in an enclosure. The maximum size of fuses for the safety switch is ___ amps. Z = 7%.
• What are the two main components of a PoE system?
• Switches rated 20 amps or less and designed for the direct connection of aluminum conductors shall be marked ___.
• In EVs, which device is commonly used to deliver rapid bursts of power for acceleration as a secondary energy storage?
• Service-entrance conductors must have an ampacity ___ the rating of the service disconnect.
• Which element is not essential to the basic operation of most organizations?
• A DC drive controls the ___ of a DC motor by varying the voltage applied to the armature.
• When you first arrive on a new jobsite, you should locate ___.
• The smallest size grounding electrode conductor connected to a ground ring from a 225-A, main breaker service panelboard is ___ AWG. The service panelboard is fed with four 4/0 AWG conductors and the ground ring is a 2 AWG copper conductor.
• To operate a TMH manufactured by Terex, you must be trained to operate a TMH: which of the following brands?
• How often should a supervisor communicate with their team?
• What is the insulation temperature rating of type THHN wire in a damp location?
• What voltage should a meter indicate between the neutral and the ground on a 208/120 V, 3-phase, 4-wire system?
• Receptacles located within patient rooms, bathrooms, playrooms, activity rooms, and patient care areas of pediatric units must be listed tamper resistant or employ a listed ___ cover.
• Raceways, cable trays, and other wiring methods for intrinsically safe wiring shall be identified with permanently affixed labels no more than what distance apart?
• Devices with built-in ___ loads are designed to correct harmonics.
• Circuits HA-1, -4, and -11 with a neutral have been pulled in EMT from a 277/480-volt, 3Ø, 4W panelboard to some high-bay luminaires. If the wire from breaker 11 comes in contact with the EMT, ___ will occur.
• Which NEC designation addresses GFCI protections for office bathrooms?
• Adequate headroom must be provided to allow employees to stand upright in a suspended personnel platform.
• An example of a rack type used in limited energy systems is which of the following?
• Which of the following installations ARE covered by the NEC?
• ___ power is the work performed by the load or circuit.
• Which of the following would be an example of an Analog input?
• A single-phase 240-volt residential central air-conditioning unit, the minimum Romex NM cable size to the unit, with THHN/THWN insulation, is which AWG?
• In Class II Division 1 locations, fittings and boxes shall be provided with ___ for connection to conduit or cable terminations and shall be dusttight.
• A common style of BNC connector is ___.
• Using the standard calculation method, what is the total dryer load (line and neutral) for eight household dryers rated at 5.5 kW each?
• As part of an emergency action plan for a construction job, the emergency telephone list must include those to be called for ___.
• When ergonomics is applied in the workplace, which outcome is directly observed?
• Which cord type has thermoset insulation?
• A dedicated circuit feeds a switch that controls a light in a dwelling. The light never works. Which could be a possible reason given typical fault patterns?
• Which option best describes the charger typically used for residential EV charging?
• The smallest standard size metal box for the following is required: one 1/2 in NM exterior connector, one 14-2 NM cable, one 20-amp 240-volt duplex receptacle, one PVC exterior connector, two 12 AWG conductors to the receptacle, one 12 AWG EGC, and two 14 AWG conductors to the NM cable with wire nuts.
• To provide for safety, ladders should be ___.
• Listed or labeled equipment for a use shall be installed and used in accordance with ___.
• Which battery type is typically used in computers and medical equipment and has also been widely used in hybrid electric vehicles?
• A 300-A service with 350 kcmil feeders; what is the minimum MBJ size?
• According to the National Safety Council, ten of eleven deaths occur due to ___ accidents.
• If a fire starts, what is the first action for an untrained person?
• OSHA and NFPA 70E require that a ___ must be trained in and familiar with the clearance and approach distances.
• Which statement about a garbage disposal installation is true?
• Where two to six service disconnecting means in separate enclosures are grouped at one location and supply separate loads from one service drop or lateral, how many sets of service-entrance conductors shall be permitted to supply such service equipment enclosures?
• Which two connectors together allow AC charging in North America?
• Which unit designates the storage capacity of a battery?
• What is a safe method to bring small tools to a ladder's working level?
• Under the optional calculation method, four or more space-heating units are calculated at what percentage of their nameplate rating?
• To allow for adequate ventilation or dissipation of heat, transformers are required to be marked with a minimum distance or clearance from walls or other obstructions.
• The NEC requires the ampacity of a feeder shall be equal to or greater than ___.
• Electrocutions are the most common cause of death in which type of lifts?
• Minimum fire rating for materials used in housing a dry-type transformer rated over 112.5 kVA is 1 hour.
• Systems in a building that can be controlled by building automation technology include all of the below except ___.
• Which of the following is a symptom of a miswired control transformer in a motor start/stop circuit?
• Using the optional calculation method, four or more separately-controlled electric space-heating units in a single family dwelling are calculated at ___% of their nameplate ratings.
• What is another name for giving feedback by starting with a positive comment, followed by constructive criticism, and ending with encouragement?
• Which measures help prevent accidents and fatalities during trenching and excavating operations?
• Which label indicates a hospital-grade receptacle?
• There are ___ basic mounting methods for PV installations.
• An electrically operated pipe organ shall have both the generator and motor frames connected to the equipment grounding conductor unless ___.
• What practice is recommended for exam preparation according to the guidance?
• Current-limiting fuses are designed to operate within what time after sensing a short-circuit current in a 60 Hz system?
• When another person has been seriously injured and is bleeding, you should ___.
• In typical organizations, which group receives direct supervision?
• In a residential split-phase 120/240 V system, what is the voltage between the two hot legs?
• The conductors shown at Point L are ___ conductors.
• SE service-entrance cables interior use requires conductors of the thermoset or thermoplastic type.
• A supervisor on a jobsite is expected to communicate with all of the following except ___.
• The disconnecting means for ESS installed in a separate room must be lockable in the __ position.
• When a conduit containing service entrance conductors runs beneath a building, what is the minimum depth of concrete required to cover a conduit for it to be considered 'outside' the building?
• In general, switches shall switch which conductor?
• In making fiber optic cable terminations, you should wear safety glasses with ___.
• Which chapters apply generally unless modified by later chapters?
• Overcurrent protection location for panelboards fed through transformers?
• Which statement describes the fault-current path in a properly grounded service?
• Which home safety items should you have?
• In a pull box, if Conduits H and K contain the same conductors, what is the minimum distance, in inches, between Conduits H and K?
• Exposure to extremely and moderately loud noise levels causes ___ hearing loss.
• Overcurrent protection for EVSE feeders must be not less than 125% of the maximum load.
• The smallest wire size for which overcurrent protection is specified in the Code is ___.
• Which term describes the process of verifying that a PV system is installed and operates as designed?
• What must the service disconnecting means plainly indicate?
• According to ladder safety, what is an acceptable way to bring tools to a working level?
• In intrinsically safe apparatus, conduits and cables that are required to be sealed shall ___.
• What is the minimum conductor size for a branch circuit supplying a motor with the following nameplate information: 115/230V 1Ø 5 hp; The supply is a 2-pole breaker in a 120/240-V 1-ph, 3W panel?
• Which could be used as a disconnecting means for a 2 horsepower, 240-volt, single-phase motor?
• Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets unless located within ___ feet of the wall.
• In Class II Division 1 locations, fittings and boxes shall be provided with which feature to permit connection to conduit terminations and maintain dusttightness?
• Where necessary to prevent ___, an automatic overcurrent device protecting service conductors supplying only a specific load, such as a water heater, shall be permitted to be locked or sealed where located so as to be accessible.
• Extension ladders should be tall enough to ___ the intended level.
• The ___ contain(s) schedules to determine when to operate systems based on occupancy.
• In a setup with a 7200 to 4160 V three-phase transformer, 150 kVA, in a supervised location, the feeder tap is protected with a three-phase circuit breaker in an enclosure. The transformer has 7% impedance and powers a three-phase fused safety switch. According to NEC 450.3, the fuses in the switch may be no larger than ___ amps.
• ___ cells are made of a single crystal and offer a higher efficiency but come at a higher price.
• Arc flash standards are addressed in which NFPA standard?
• NFPA 70E uses the measurement of ___ in determining the arc flash boundary.
• Which of the following is a character trait?
• EVSE stands for which term?
• Two ungrounded branch circuit conductors are installed to serve a load. These are installed in PVC. The 8 AWG copper ungrounded conductors are permitted to be ___.
• Which enclosure type is designed to prevent ignition of surrounding dust when an electrical fault occurs?
• A 1600-A, 3-phase, 208/120-volt service is supplied with five parallel sets of 500 kcmil ungrounded conductors. What is the minimum size for the main bonding jumper?
• A switch box will contain an isolated ground receptacle and a 12/2 with ground AC cable with exterior connector. The shallowest switch box you can use for this installation is 3" × 2" × ___ inches.
• ___ are typically used in EVs for ancillary loads.
• There are ___ types of electric vehicle chargers.
• To provide shock hazard control for firefighters inside the array boundary, the highest voltage inside the array boundary shall not exceed ___ V within 30 seconds of rapid shutdown initiation.
• OSHA ___ provide standards for bloodborne pathogen safety on construction sites.
• AC drives can be used for HVAC systems that require ___.
• Which location is explicitly mentioned as requiring NEC-compliant electrical installations?
• True or False: Electromechanical devices can tolerate transient voltages several times their ratings for a short period.
• Reactive power is the component of power that contributes to maintaining voltage levels for system stability. Which option best describes this?
• When fall protection equipment is utilized while operating lift equipment, ___ can be used as tie-off points.
• A 2-inch raceway is to be installed in a pull box for a straight pull. Conductors are 4 AWG. What is the minimum length of the pull box (inches)?
• A luminaire that weighs more than 50 pounds must be supported by other means than its outlet box. Which weight threshold is this?
• A branch circuit providing power to a bathroom receptacle may power which configurations?
• The grounded conductor for feeders shall be permitted to be sized by adding ___ percent of the continuous load and ___ percent of the noncontinuous load.
• In order to properly inspect rubber insulation gloves, any dirt or contaminates should be cleaned off the rubber. Then the rubber should be which to trap air?
• What is the easiest and most efficient method to program a robust process into a PLR?
• ___ refers to the stored energy lost over time even when a battery is not in use.
• Instantaneous-trip circuit breakers can be installed ___.
• Which NEC Article covers low voltage lighting?
• For the same 3Ø, 4-W open-delta bank, the line voltage equals ___.
• Which statement best describes the PLR as it relates to programmable controllers?
• Eight-pin, eight-conductor (8P8C) connector is commonly referred to as a(n) ___.
• Which statement best describes the location requirement for the ESS disconnecting means with respect to the energy storage component?
• In PLR logic, two switches connected in series energize the output only if what condition is met?
• Ambient temperature for the 750 kcmil aluminum conductor problem was 22°C. Which of the following is the correct ampacity for the cited scenario?
• Each apartment in a 50-unit apartment complex has a 4 kW electric clothes dryer. The service for the apartment complex is 120/208V 3-phase 4-wire. Using the standard method, what is the demand on the service for these dryers?
• Which component type is used in motor drives to control speed?
• A signal indicating an emergency requiring immediate action in a fire alarm system is a(n) ___.
• Which statement about the air-conditioner unit is true regarding its minimum circuit ampacity on the nameplate?
• Which box and plaster ring combination is used in the two-gang installation described in the first scenario to meet the NEC volume requirement?
• According to NEC Chapter 9 Table 2, what is the minimum permitted radius for a 2-inch RMC containing THWN conductors when using a single-operation bending machine?
• A 11/2" RMC nipple with three conductors can be filled to an area of ___ square inches.
• Is it permitted by NEC to mount an outdoor luminaire directly on a tree?
• Output circuits in a one-family dwelling supplied by a wind turbine shall be permitted to have a maximum voltage up to ___ V.
• Which wiring method is NOT permitted by the NEC for underground service conductors?
• In a PoE system, which device provides power to the PDs over Ethernet?
• ___ surrounds the windings in typical 'pole-mounted' transformers.
• The maximum inverter output circuit current is equal to which of the following output current ratings?
• During vibration analysis, look for ___ peaks and see if they repeat. These peaks correlate the frequency peak with the characteristics of a system, such as a motor rotation.
• Table 400.4 in the NEC is used to determine which characteristic of flexible cords?
• Which of the following statements is true about discrete I/O in programmable controllers?
• What is the total nameplate load (in kW) of a kitchen with a 4 kW cooktop and two ovens rated 5.5 kW each?
• What overarching principle do these examples illustrate about electrical service calculations?
• One consideration for an emergency action plan includes the determination of the types of emergencies that may be encountered. This is because, if the emergency is the result of a terrorist threat or action, ___ may be involved.
• GFCI protection for a feeder disconnect is required in which scenario?
• When calculating the total load on a dwelling, the minimum VA to add for the two required small-appliance circuits is
• ___ systems are designed to allow the array to follow the sun.
• What is the feeder demand in amps for a 3,000 sq-ft bank that is accessible to pedestrians? The bank has 30 feet of show window and a 5 hp 240V air conditioner. All lighting, including any show windows and signs, is continuous. The panel supplying the feeder is 120/240V 1-phase 3-wire.
• The professional association supporting the advancement of the information and communications technology profession is ___.
• Which term best describes a feeder conductor?
• When fixed multioutlet assemblies are employed, each ___ feet or fraction thereof of each separate and continuous length shall be considered as one outlet of not less than 180 volt-amps where the connected appliances are unlikely to be used simultaneously.
• Which of the following is the correct description for the zone around a bathtub and shower where luminaire parts are restricted?
• Overcurrent protection for feeders and branch circuits supplying electric vehicle supply equipment shall have a rating of not less than ___% of the maximum load of the electric vehicle supply equipment.
• LONtalk is a communication network similar to ___.
• All conductors of the same circuit and, where used, the grounded conductor and all equipment grounding conductors and bonding conductors shall be contained within the same raceway, cable, or cord.
• Which set of symptoms could indicate an impending heart attack?
• The smallest THHN/THWN copper grounded conductor that can be installed for a service is ___ when the ungrounded conductors are 1/0 THWN/THHN copper.
• Many materials used in limited energy installations are ___ as they are for line voltage installations.
• ___ may also be used as a secondary energy storage device in electric vehicles.
• Preventive maintenance ___.
• The restricted approach boundary is intended to prevent an individual from being injured by which hazard while working on exposed energized conductors or circuit parts?
• Which of the following is an example of an INPUT?
• ___ charging uses 208 or 240 volts and is able to charge an electric vehicle's battery in 4-6 hours.
• How many outside receptacles, accessible at grade level, are required for a single-family dwelling?
• What electrical phenomenon prompts the NEC to require separate neutrals for circuits feeding fluorescent fixtures with electronic ballasts?
• When conducting a vibration analysis, it is important to ___.
• Which gesture indicates the bridge should be moved?
• Which NEC provision requires GFCI protection for receptacles in office building bathrooms?
• RCA is the acronym for which organization?
• Open flames, smoking, or other sources of ignition must be kept at least ___ feet away from flammable or combustible liquids.
• A liquid-filled transformer has a primary voltage of 12,470 volts. The transformer is surrounded by a 6-foot-high fence. The overall height of the fence must be extended 1 foot with at least ___ strands of barbed wire on top of the fence.
• Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets unless located within ___ feet of the wall.
• Which device records analog CCTV signals in a standalone unit?
• For a 5 horsepower, 240-volt, single-phase motor, which of the following could be used as a disconnecting means?
• Energized parts of service equipment that are not enclosed shall be installed on a device such as a switchboard, panelboard, or control board, or any of these.
• Which statement about training time is correct?
• In North America, ___ connector standards allow EVs to charge at AC charging stations.
• In major repair garages where vehicles that are fueled with lighter‑than‑air fuels are repaired or stored, the area within what distance of the ceiling shall be considered unclassified if ventilation is provided from a point within 450 mm (18 in.) of the highest point in the ceiling?
• Electric heating appliances employing resistance-type heating elements rated more than how many amps shall have the heating elements subdivided?
• In a switch enclosure, which function does the grounded conductor provide?
• Overhead service conductors shall have a vertical clearance of not less than ___ above the roof surface.
• In a 120/240 V single-phase service, the voltage between the two hot conductors is
• Which of the following voltage systems is solidly grounded?
• In a house bathroom, receptacles are required to have which protections?
• For a classroom measuring 36 by 24 feet with a 3-foot wide door at the far end of one of the 36-foot long walls, how many receptacles are required?
• The storage capacity of a battery is designated by which unit?
• Using the standard calculation method, what is the general lighting and receptacle minimum unit load (line and neutral) for a 7-unit multifamily dwelling with one laundry circuit and two small appliance-circuits in each 1,980 sq-ft unit?
• ___ is sometimes referred to as condition-based maintenance.
• For rapid shutdown labeling, which combination of items I through V must be included on the permanent label located at each service equipment location?
• To reach at least 360 VA using 180 VA per foot, how many feet are required?
• The minimum trade size RMC required for a 45 ft run with four #12 THHN/THWN, three #10 THHN/THWN, and two #6 THHN/THWN conductors is which of the following?
• For a 12 AWG copper Type SO cord, which three-pole overcurrent protection size is permitted?
• The disconnecting means of a hermetic-type refrigerator compressor shall have an ampacity of at least ___ of the nameplate rated-load current.
• Show window load for a 12-foot long display using 200 VA per linear foot.
• Load #3 draws 52 amps; the circuit uses a 300-amp breaker and 350 kcmil conductors with 75°C lugs, 4 ft distance to the fused disconnect. What is the smallest size wire permitted between Pull Box 2 and the fused disconnect for Load #3?
• In minor repair garages, the space below the floor level in a ventilated pit is classified as what?
• Which safety rule applies to ignition sources near flammable liquids?
• The North American Charging Standard (NACS) was developed by ___.
• The grounded secondary conductor is correctly identified as the neutral.
• When run in parallel using two conduits, what is the minimum kcmil size permitted for conductors between a 480-volt, 3Ø generator rated at 500 kVA and a distribution panelboard?
• Company culture aligns with all of the following except ___.
• A(n) ___ charger is commonly at a fixed location and supplies DC power directly to the batteries inside an EV.
• A ___ is/are considered to be service equipment by the NEC.
• Water heaters having a capacity of ___ gallons or less shall have a branch-circuit amp rating not less than 125% of the amp rating of the water heater?
• A fuel cell electric vehicle ___.
• For a 200-amp feeder in a single-family dwelling, what is the smallest conductor size permitted?
• Between a wind electric system and loads served by the premises electrical system, which device shall be installed to protect the premises?
• Which description correctly applies to the transition from conduit to knob-and-tube wiring?
• When working with fiber optic installations, the most dangerous hazard to your eyes is due to ___.
• If a complete electrical hazard analysis has been performed, an arc flash and shock hazard warning label will provide ___.
• Which term defines a circuit not capable of igniting a flammable gas-air, vapor-air, or dust-air mixture under specified test conditions?
• Which statement accurately reflects bloodborne pathogen transmission?
• When using the optional calculation method for dwelling units, this method considers heating or A/C loads and which other type of loads?
• A 20-A, 240-V receptacle located in a finished basement laundry room requires which protections?
• The minimum size conductors needed to connect a three-phase generator to a fused disconnect switch are ___ AWG for a generator rated 90 kVA at 480 volts.
• A fused safety switch feeds a 480 to 208Y/120-volt, 3Ø, 30 kVA transformer that supplies power to a 3Ø 100-amp main breaker panelboard. The fuses in the safety switch are permitted to be not larger than how many amps?
• A motor drive is an electronic unit designed to control the speed of a motor using ___ components.
• For a 200-A service with a transformer feeding a single set of 3/0 AWG feeders, the largest copper GEC size to the water line is ___ AWG.
• True or False: A motor controlled by a VFD is sped up or slowed down by increasing or decreasing the voltage on each phase.
• To prevent underpowering, the supply voltage to an AC motor drive must be checked when additional loads or drives are added to the system.
• One of the basic roles of a supervisor is to monitor ___.
• Flexible cords shall be connected to devices and to fittings so that tension will not be transmitted to joints or terminal screws. This shall be accomplished by ___.
• Which installation is considered outside a building?
• HRC stands for Hazard Risk Category and is used most directly to determine what?
• In a 240-volt corner-grounded delta, what is the voltage between C phase and ground?
• Which statement is not true concerning the optional method of calculation for a dwelling unit?
• Which statement is not typically included on an arc flash warning label after a hazard analysis?
• Which gesture signals the operator to raise the hoist?
• The standard PV module uses how many cells?
• The rapid shutdown label information must be provided in which languages?
• Smoke alarms and smoke detectors shall not be installed within ___ feet from a door to a bathroom containing a shower or tub.
• Compared to working at waist level, musculoskeletal injuries are far more likely when working ___.
• Which statement best describes the threshold for potentially damaging sound levels?
• In a two-circuit, shared-neutral arrangement on a 120/240 V single-phase system, the neutral current is
• A ___ output could be produced by connecting three individual 240 X 480 - 120/240 volt single-phase transformers into a bank. I. 240 volt 3Ø, 3-wire II. 120/240 volt 3Ø, 4 wire
• An optical fiber termination kit usually includes all of the following tools except which?
• A sound louder than ___ dB is considered potentially damaging.
• Which term describes a short-duration voltage increase lasting less than a cycle?
• Which EV type uses both an internal combustion engine and an electric motor but may not be charged by plugging in?
• A one-line diagram serves to determine which aspects of the power system?
• The service equipment disconnect for a manufacturing building shall be installed at a readily accessible location either outside or inside ___ entrance of the service conductors.
• In the same open-delta bank, the line voltage equals the coil voltage.
• The main bonding jumper bonds the neutral to which component in a service panel?
• Which of the following are acceptable hazardous (classified) location protection techniques for electrical and electronic equipment? I. Purged and Pressurized II. Oil Immersion III. Raintight Enclosure
• The transformer rated at 10 kVA has two separate secondary windings rated 120/240 volts. This means that each secondary winding is rated at ___ kVA.
• Which of the following is a primary goal of ergonomic hand tool design?
• If someone collapses and is breathing abnormally, you should first ____.
• Which statement describes the function of a VFD?
• Equipment operating with a poor power factor may result in ___.
• In major repair garages, the area within how many inches of the ceiling must be considered unclassified when ventilation of at least 1 cfm/ft2 is provided for lighter‑than‑air fuelled vehicles?
• Typically, ___ are supervised by ___.
• Power that is derived from a PLC's power supply and then used for inputs and outputs is ___.
• In a 277/480-volt, 3-phase, 4-wire system, the branch circuit conductors are on a 60-A circuit breaker. The load draws 52 A, and 1/0 AWG conductors would have been more suitable if the run were shorter, but voltage drop considerations require using an EGC of which size?
• Which feature helps identify essential system receptacles or their cover plates at a glance?
• In PLR programming, 'FBD' designates:
• Which device primarily protects against arc faults by recognizing arcing patterns and de-energizing the circuit?
• Ladders that can be used by two people have which configuration?
• How can PoE lighting systems be protected from surges?
• Which NEC article covers solar PV systems?
• Which statement about the PV rapid shutdown label content is true?
• When transitioning into a supervisor role, small differences in your actions can have ___ impact on results.
• Section ___ of the NEC permits nonmetallic outlet and device boxes to be installed with nonmetallic sheathed cable.
• Fastened-in-place utilization equipment that is connected to a branch circuit with other loads shall not exceed ___ percent of the branch circuit rating.
• Transferring Class I liquids up to 18 inches above the floor occurs in which classification?
• A ___ generally has larger battery packs than hybrid electric vehicles, which allows it to travel moderate distances just using electricity.
• Which of the following can be symptoms of impending sudden cardiac arrest?
• In Category 1 space operating rooms, what is the minimum number of receptacles required?
• In panelboards, where the voltage between busbars is 150 volts and the bars are opposite polarity and held free in air, the minimum spacing between the parts is ___.
• In a 480/277 V system, what is the line-to-line voltage between phase B and phase C?
• What is the minimum size copper conductor that may be used for an overhead feeder which is 35 feet in length from a residence to a remote garage?
• For a one-family dwelling, what is the minimum amperage rating for the service disconnecting means?
• Which class of fires involves combustibles such as wood, paper, plastics, rubber, and cloth?
• TVSS devices are classified by the maximum ___ measured on a per-phase basis.
• Which NEC section addresses a situation where a box selected to meet minimum volume may be too small for device installation?
• Circuit breakers and switches containing fuses shall be readily accessible and installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than ___ above the floor or working platform.
• In continuous-duty applications, motors rated above how many horsepower must be protected against overload?
• What is the minimum size of the ungrounded conductors in each conduit feeding Panel A?
• If there is a possibility of a terrorist threat, which hazards might be involved?
• Which damp-location luminaire marking code is correct?
• A four-gang plastic device box contains three 3-way switches and one GFCI receptacle. Two 14/2 w/ground NM cables enter the box to bring power to the switches and send power to other devices along the circuit. Three 14/3 w/ground NM cables enter the box to terminate on the switches. Two 12/2 w/ground NM cables enter the box and terminate on the GFCI receptacle. What is the calculated volume fill of these devices and conductors?
• An electrical hazard analysis performed prior to working on or near energized conductors establishes approach boundaries. To work in a ___ approach boundary is considered to be the same as making direct contact with an energized part, and workers must be qualified and wear proper PPE.
• A branch circuit, where 2 AWG conductors are installed, serves a single load that will not operate more than 3 hours. The equipment served by the branch circuit is marked for conductors larger than 1 AWG. These conductors can be protected by a circuit breaker with a rating no greater than ___ amps.
• What voltage should a meter indicate when placing the leads on phase A and the neutral of a 480/277, 3-phase, 4-wire system?
• A central electric furnace heating system installed in a home shall be connected to what type of circuit?
• When ___, it is permitted to install receptacles face up in bathroom basin countertops.
• At what stage of troubleshooting should you first use tools?
• In a dwelling with multiple wireless nodes, what network topology describes a network that provides seamless coverage?
• Which of the following is a valid property of containers used for flammable liquids?
• What is the minimum size of the ungrounded conductors in each conduit feeding Panel A?
• Transformer ventilation openings for transformers rated over 50 kVA are calculated at how many square inches per kVA, less the area for grates?
• For temporary wiring over ___ volts, nominal, suitable fencing, barriers, or other effective means shall be provided to limit access only to authorized and qualified personnel.
• What voltage should a meter indicate when measuring phase A and phase B on a 208/120, 3-phase, 4-wire system?
• In a dedicated circuit feeding a switch that controls a light, the light fails to illuminate even though voltage is present at the line side and load side when the switch is ON. What is the most likely fault?
• Metal faceplates for devices shall be of ferrous metal not less than ___ inches in thickness.
• In a basement with three separate unfinished areas, each with a perimeter of 30 feet, what is the minimum number of receptacles?
• Hazardous chemicals and compounds are generally which type of hazards?
• If it can be demonstrated that a task cannot be de-energized, then it would require which prior to performing work on the circuit?
• Firestopping products resist the passage of which elements between levels?
• In PoE terminology, what best describes the device that receives power from the network?
• In a 7200 to 4160-volt, 3Ø, 150 kVA transformer installed in a supervised location and supplied from a feeder tap protected with a 3Ø fused safety switch, the maximum size fuses permitted in the safety switch is:
• Which of the following is NOT a feature of a PLR?
• What is the sum, in inches, of diameters H and M?
• Among the possible box assemblies, the smallest permitted to contain the following is: Exterior MC cable connectors are used. One - 30-amp 240-volt single receptacle and One - 15-amp 120-volt single receptacle; Two - 10/2 with ground MC cables plus One - 14/2 with ground MC cable.
• For dwellings, heating or A/C loads are calculated at ___% of the nameplate rating and the largest load is used for a standard calculation.
• Which statement best summarizes the overall impact of harmonic currents on a power system?
• Each apartment in a 30-unit apartment complex has a 2 kW water heater. Using the standard method, what is the demand on the service for these water heaters?
• BACnet is best described as?
• The NEC permits transformer secondary conductors to be connected without overcurrent protection at the secondary if these conditions are met, which also include ‘all of these’?
• All racking systems ___.
• Where a transformer vault is not protected by an automatic fire suppression system, the minimum thickness for the concrete walls is how many inches?
• The OCPDs protecting circuits for supervised fire pumps are selected to ___.
• Accident prevention tags shall be used as a ___ means of warning employees of an existing hazard.
• When ___ touch together, this is a ground fault.
• In a dwelling, multiple Wi-Fi nodes can work together as a ___ to cover an entire home with a strong wireless signal.
• Which conductor installations are wet locations?
• The NEC requires simultaneous disconnect of ungrounded conductors for multiwire branch circuits that supply more than one device on the same yoke. Which device satisfies this requirement when disconnecting at the panelboard?
• Which feature of a VFD helps reduce mechanical stress during motor start?
• A ___ charger is typically found in residential applications.
• Sudden cardiac arrest is a condition that can be described as which of the following?
• For each minute a victim of sudden cardiac arrest goes without help, the survival rate drops by roughly what percent?
• A common style of BNC connector is ___.
• Which of the following is used in conjunction with manufacturer software to program PLRs?
• The use of fans to distribute the air in a closed area ___ sufficient to avoid toxic concentrations of carbon monoxide.
• A hallway in a dwelling is 17 feet long. At least ___ receptacle(s) are required to be installed.
• Which statement about AC drives is true?
• During troubleshooting, is it possible that multiple components may need attention?
• Predictive maintenance is ___.
• Which component is used to smooth the DC bus voltage in motor drives?
• An example of preventive maintenance is ___.
• Pull stations should be located within how many feet of each egress (door) on each floor?
• The maximum power to a powered device in a PoE+ system is ___.
• The minimum size service disconnect for a single-family dwelling with a computed load of 10 kVA is ___ amps.
• NEC Article ___ covers electric vehicle charging and supply equipment.
• Hazardous (classified) locations are considered special locations due to the presence of ___.
• What is a potential disadvantage of using a VFD?
• For an 11,000 sq-ft courthouse, the minimum general lighting load is which value?
• When working near exposed, energized electrical conductors, which ladder materials are suitable? I fiberglass II wooden III metal.
• Which element is commonly standardized across safety signs to aid recognition worldwide?
• Which maintenance approach is commonly referred to as condition-based maintenance?
• A(n) ___ is a device that is used to determine the location that fiber is broken.
• Maximum size circuit breaker permitted by NEC Table 450.3(A) to protect the primary of a 4160 to 480-V, 3Ø, 75 kVA transformer with 1.7% impedance in a nonsupervised location is:
• Eye protection for arc flash must protect from which type of light produced by the arc?
• There are how many methods bond telecommunications racks to a building's grounding system?
• Which of the following is an example of an INPUT device?
• When coaching, the method of providing feedback where positive feedback is offered before negative feedback is called the ___.
• If a sign's rating is 1500 VA, which value should be used for the sign branch circuit load?
• An overhead garage door receptacle shall be GFCI protected. Which section states this?
• The design of a proper firestop system must ___.
• How many outside receptacles, accessible at grade level, are required for a single-family dwelling?
• Which statement about sizing the feeder OCPD is correct?
• Which statement about licensing jurisdiction for electricians is accurate?
• When working on a PV system, important safety precautions should be followed including ___.
• A bank of three 240x480-120/240 V transformers connected together can produce which 3-phase outputs?
• A ___ reviews analytics that measure equipment performance to determine where energy is being wasted or used inefficiently.
• Which term best describes a conductor used to connect equipment to earth ground?
• NEC Article ___ covers interconnected electric power production sources.
• Which load type is generally responsible for harmonics in power systems?
• According to NFPA 70E®, it is not required to complete an energized electrical work permit for troubleshooting, voltage testing, and other diagnostic activities.
• Arc blasts can cause severe injuries, including which of the following?
• What is the minimum torque for screw-type pressure terminals used with 14 AWG or smaller copper conductors in motor controllers?
• A single-phase, 240-volt residential central air-conditioning unit has a compressor with an RLC of 28.9 amps, a 1/4 hp fan, minimum circuit ampacity 37.9 amps, and maximum fuse size 60 amps. The minimum size NM cable that can be installed (THHN/THWN insulation) is ___ AWG.
• The largest size copper GEC required to be used to building steel from a 400-A main breaker panelboard fed from a transformer with three parallel sets of 1/0 AWG is which AWG?
• Which statement about Table 220.55 is not true?
• Talking on a cell phone while working can be distracting and cause a safety hazard.
• A liquid with a flash point of 140 degrees F is classified as combustible.
• Unless enclosed in an approved storage cabinet, not more than ___ gallons of flammable or combustible liquids are permitted to be stored inside a room.
• Fastened-in-place utilization equipment that is connected to a branch circuit with other loads shall not exceed ___ percent of the branch circuit rating.
• The ___ a supervisor takes during the first three months in a new supervisor role will largely determine whether the supervisor succeeds or fails.
• When lifting or moving suspended loads, the ___ must always be within sight of the lift operator.
• Which area is particularly prone to injury when performing overhead work?
• An existing finished basement is remodeled into a new apartment. A new subpanel is installed to serve this new dwelling. The heat and A/C is supplied by the existing dwelling and will not be included in the feeder calculation. What size feeder and OCPD should be installed at this new panel? Use the following loads to calculate the feeder and subpanel OCPD. The subpanel voltage is 120/240V 1-phase, 3-wire. Floor area - 900 square-feet; 2 small appliance circuits and 1 laundry circuit; Water heater (240 V) - 3,500 W; Electric range - 6,000 W; Electric clothes dryer - 4,500 W; Sump pump #1 (120 V) - 1,176 VA (largest motor); Sump pump #2 (120V) - 864 VA; Garbage disposer (120 V) - 920 VA; Supplemental electric in-wall heat for bedroom - 3,000 W
• In load calculations, the unit used to express sign branch circuit loads is typically which?
• For general motor application, the fuse size for the motor branch circuit must be determined from___.
• A 30A 240V receptacle in a finished basement 7 feet from a utility sink requires which of the following?
• The distance for the array boundary is defined as 12 inches from the array in all directions.
• In a 480Y/277 three-phase system, what is the voltage between phase A and phase B?
• By definition, a liquid with a flash point less than 140 degrees F is called which?
• The training of any worker who uses slings and rigging should include the ability to ___.
• Which item is NOT part of the fire protection triangle?
• What is the minimum feeder demand load for two 3 kW cooktops and two 5 kW wall-mounted ovens on separate branch circuits but on the same feeder?
• Time-delay fuses are also known as which type of fuses?
• In the six-gang box example, how many cable clamps are included in the assembly?
• Which type of connector is commonly used for professional audio microphone cables?
• What term describes a group of PV modules connected together to form a larger electrical generator?
• Which circuit is dedicated to powering and signaling notification devices in a fire alarm system?
• A countertop receptacle on kitchen or bathroom counters: is it permissible to install face-up?
• For a motor circuit using a 120/240-volt, 3Ø, 4-wire panelboard with 75°C terminations, the smallest acceptable AWG for the conductor is which of these?
• Energy that is superimposed on an AC voltage waveform is a(n) ___.
• NEC Article ___ covers large-scale solar PV facilities.
• The nominal voltage between the breaker in space 4 and the neutral bar is ___ volts.
• For a flammable or combustible liquid, the ___ is the minimum temperature at which the liquid gives off enough vapor to form an ignitable mixture in air.
• The ___ section of a programmable controller provides the voltage required for internal operation and charging the internal battery.
• If the output of a 3Ø generator is 208 volts, line-to-line, and it has a neutral connection, this is a ___ system.
• When two to six service disconnecting means are grouped at one location, how many sets of service-entrance conductors are permitted to supply such enclosures?
• Which type of electric vehicle stores energy primarily in a rechargeable battery and is typically charged from an external source?
• What is the first step in the troubleshooting process?
• Which statement about labeling requirements under NEC Articles 690 and 705 is true?
• What is the demand factor for five household clothes dryers?
• Which industrial cover/box combination violates NEC when all conductors are 12 AWG?
• A ___ is an acceptable means of connecting a fastened in place EVSE to the premises wiring system.
• Surge suppression devices may include several features. Which combination lists all features?
• For the smallest EGC between switch and motor using DETD fuses and the smallest conductors, the gauge is which?
• Which Table 300.5 row would apply when none of the specified locations apply?
• The described generators are three-phase (3Ø).
• If used after being stored in a toolbox, which of the following items could be hazardous?
• What is the minimum general lighting load for a 11,000 sq-ft courthouse?
• The primary pad base plate for wireless power transfer equipment shall be connected to which circuit conductor?
• Under 230.95, the rating of the service disconnecting means is considered to be the rating of the largest ___ that can be used.
• An HDMI connector contains ___ pins, which allows for a relatively high amount of data transfer.
• Recessed luminaires not identified for contact with insulation must be kept at least what distance from combustibles?
• In the material's examples, the nighttime decibel level near a remote location is approximately ___ dB.
• An ITCB (interrupting capacity breaker) used for a branch circuit OCPD has a maximum rating; what is the largest permitted ITCB rating for branch circuit OCPD?
• The standard parameter for comparing surge suppression devices is expressed in which per-phase unit?
• On a typical jobsite, the ___ is responsible for safety training.
• A specified area or areas within protected premises on a fire alarm system is referred to as a ___.
• What term describes a set of PV modules wired in series to increase voltage?
• According to the NEC®, what is the maximum height to mount a meter?
• Which conduit carries the most wires in the described multi-conduit arrangement?
• What is the minimum general lighting load for a 60,000 sq-ft warehouse?
• Equipment grounding conductors for PV source and PV output circuits shall be sized in accordance with NEC ___.
• Which hand signal is used to stop the motion of a traveling crane in the normal course of operation?
• In dairy processing facilities and other indoor wet locations where the walls are frequently washed, conduit should be mounted with a ___ inch air space between the wall and the conduit.
• A service disconnecting means must be ___.
• Which statement best describes safe ladder use?
• Which factor is used to determine the maximum size of a standard overcurrent device for a motor when multiple data points are provided on the nameplate?
• Toxic concentrations of carbon monoxide ___ be detected by persons with a normal sense of smell.
• Which recorder is able to record both analog and digital cameras within the same unit?
• Heat detectors that must be replaced after actuating are ___.
• Which class of fires is associated with electrical equipment?
• FACU is a ___.
• 0.3 m3/min/m2 equals how many cubic feet per minute per square foot (cfm/ft2)?
• Which statement about outdoor storage tanks is correct?
• Active cooling is required only on the infrastructure side of ___ charging.
• Many hand injuries can be prevented by wearing gloves.
• Falls and equipment turn-overs are the most common cause of death in ___ lifts.
• The maximum distance allowed between the ESS disconnect and the ESS is 50 feet.
• ___ are odd harmonics divisible by 3 and cause problems on three-phase, four-wire circuits because they are not in phase with anything but themselves.
• Which arrangement best saves a life in sudden cardiac arrest: CPR and AED?
• When motors are ___ hp or greater, the motor nameplate shall include the rated horsepower.
• Which statements about hand signals used on a jobsite are correct?
• Voltage taps on a transformer primary are used when the input voltage is ___ than the rated (or normal) voltage.
• What voltage should a meter indicate when placing the leads on phase A and ground of a 480/277, 3-phase, 4-wire system?
• Which range corresponds to the locked-rotor kVA per horsepower when code letter D is on the nameplate?
• A public address (PA) system enables ___ communication.
• If a ladder is determined to be unsafe for use, it should be ___.
• Which term describes an EV charging method where power is delivered directly to the battery from a separate charger unit located away from the car?
• There are ___ types of electric vehicles.
• The minimum size of transformer vault ventilation openings for transformers rated less than 50 kVA is ___ square feet.
• Which term describes guidance for future actions?
• The wiring method used in Figure 124.103 is 14/3 w/ground AWG MC cable. Which of the device boxes listed below is the smallest you can use and not violate the NEC? Each cable contains an EGC.
• Underground service conductors between a transformer and a meter are protected against which currents?
• A fused pull-out disconnect is permitted to be installed in which location?
• In a healthcare facility, low-voltage equipment that is frequently in contact with the body must operate at which maximum voltage, unless it is intrinsically safe, double insulated, or moisture resistant?
• A supervisor's ___ is the first thing other employees see in the morning safety meeting.
• Be aware of co-workers who have a distinctive appearance, such as bright-colored shirts or shiny new hard hats, because these workers may be ___ to you or others.
• Which grounding configuration is not permitted for PV systems?
• If a system is designated as delta or wye, the system is three-phase.
• An HMI is a ___.
• Which gesture signals the operator to move the trolley?
• For the service shown, the GEC to building steel must be at least ___ AWG in size.
• A good rule of thumb is to keep smoke detectors ___ feet away from air diffusers, ceiling fans, etc.
• Which AWG size is listed as the minimum for flexible cords to be protected from overcurrent devices?
• Grounding and bonding of enclosures, cabinets, and racks for limited energy systems must follow NEC® and ___ requirements.
• ___ is defined as being surrounded by a case, housing, fence, or walls that prevents persons from accidentally contacting energized parts.
• Which tool is not typically included in a basic optical fiber termination kit?
• Transformers with ventilating openings must be installed so that the openings are not blocked by walls or obstructions. The required clearance shall be maintained on which surfaces?
• When climbing or descending a ladder, where should your back be in relation to the ladder?
• Which NEC code applies to fire alarm systems?
• Which NEC Article covers the rules necessary for the installation of appliances?
• Potassium and Sodium are classified as which hazard due to their reactivity with other chemicals?
• For cord-connected EVSEs without a cable management system, the maximum usable length of the cable is which value?
• Fire alarm is covered under ___.
• Which term designates the verification that a PV array has been installed and operates as designed?
• Which code reference requires suitable marking on a luminaire used in damp locations such as under a canopy covering a walkway into a building?
• When an electrician has been shocked, what should they do?
• In facility-wide suppression, TVSS units need to be coordinated in a(n) ___ approach.
• Which option represents the correct box size for the described two-gang plaster ring when used with a 4 × 11/2 square box?
• When the bridge of a traveling crane is to be moved, you should signal by which gesture?
• In a branch circuit protected with a fused safety switch, which rating determines the branch-circuit rating?
• Which Table 300.5 row addresses cover requirements for underground conduit located in airport runways and adjacent areas where trespassing prohibited?
• Each apartment in a 50-unit apartment complex has a 1.6 kW dishwasher. Using the optional method, determine the demand in kW on the service for these dishwashers.
• Exposure to loud noises can
• All of the following are examples of soiling except which?
• Which type of conductor is intended to carry current back to the source under normal operation?
• In Scenario 230.26, what is the motor nameplate voltage and phase?
• The stairway difference requirement for wall switch control is six steps or more. Which option reflects this requirement correctly?
• Calculate show window load for 2 linear feet.
• For an 8-foot long show window, the load is 1600 VA. Which of the following is a correct representation of this calculation?
• Conductors supplying a fire pump motor(s), pressure maintenance pumps, and associated fire pump accessory equipment shall have a rating not less than ___% of the sum of the fire pump motor(s) and pressure maintenance motor(s) full-load current(s), and ___% of the associated fire pump accessory equipment.
• A library has a total of 70 receptacles. What is the minimum receptacle load demand for these receptacles?
• The typical service voltage for one- and two-family dwellings is
• ___-connected primaries are more common.
• For use internationally, many safety signs include ___.
• Where the opening to an outlet, junction, or switch point is less than 8 inches in any dimension, each conductor shall be long enough to extend at least ___ inches outside the opening of the enclosure.
• In parallel conductors, which statements are true?
• For an installation with not more than two 2-wire branch circuits, the service disconnecting means shall have a rating of not less than ___ amps.
• Which statement about small-appliance and laundry loads in relation to Table 220.45 is correct?
• Accident rates can be reduced by ___.
• In boiler installations, the copper conductor used between the disconnect and the boiler must be sized using THHN/THWN insulation. Which gauge satisfies the minimum sizing for an 8.2 kW, 240 V, 1-phase boiler?
• When a safety switch is installed adjacent to the motor, the maximum size DETD fuses permitted are ___ A.
• Arc rating is used to describe a material's performance when exposed to which hazard?
• In PLR programming, two switches in parallel are described as which?
• For Motor #2, the minimum tap conductor size is which AWG or kcmil?
• Which term describes an alarm signal indicating an emergency requiring immediate action by occupants?
• Locations where flammable anesthetics are employed are Class I, Division I locations that shall extend ___.
• The entire floor area in a major repair garage without ventilation, up to a level of 18 inches above the floor, is considered a what location where Class I liquids, hydrogen, natural gas, or LPG are transferred?
• Luminaires located on the outside of an office building under a covered entryway may be marked as suitable for which locations?
• Of the two to six service disconnecting means in a panel, only a disconnect used for ___ is permitted to be remote from the other disconnects.
• When circuit breakers are installed with the switch operation either UP or DOWN, pulling DOWN on the handle turns the breaker ___.
• In the 480 to 208Y/120-volt transformer example, what is the line-to-line voltage on the secondary?
• Handholes are not required in metal parking lot light poles if the base is hinged and the pole is how many feet or less in height?
• In order to establish an effective ground-fault current path, impedance must be ___.
• A service panel MDP with a 300-A main breaker and conduit containing 350 kcmil conductors. The minimum size main bonding jumper is ___ AWG or kcmil.
• A fused combination motor starter controls a 3-phase motor. Line side voltage is 480 volt. There is a control transformer to reduce the voltage to 120 for the controls. The starter is controlled by a start/stop station. The start button is pushed, and the motor runs slow and then trips the C overload. What would be a possible reason for this fault?
• What is the term for the mounting hardware used to support PV modules on a site?
• Which statement is true about surge protection in PoE systems?
• Why is it important to understand the malfunction when troubleshooting?
• When the trolley of a traveling crane is to be moved, you should signal by which gesture?
• Using the optional calculation method, less than four separately-controlled electric space-heating units are calculated at what percent of their nameplate ratings?
• Which action is required when a task cannot be de-energized and involves energized equipment?
• Which Table 300.5 row addresses cover requirements for underground conduit in one- and two-family dwelling driveways and outdoor parking areas, and used only for dwelling-related purposes?
• Harmonic problems in equipment can cause the following symptoms except for ___.
• The feeder conductor ampacity shall not be less than that of the service-entrance conductors where the feeder conductors carry the total load supplied by service-entrance conductors with an ampacity of ___ amps or less.
• When an electrician has been electrocuted, he has ___.
• In PoE terminology, a device that receives power from the network is called a Powered Device (PD).
• Unless specifically listed for the purpose and location, the coupling means of electric vehicle supply equipment shall be stored or located at a height of not less than ___ inches above an indoor parking surface.
• Ground-fault protection is required for a feeder disconnect if any of the following conditions apply.
• Which is one of the primary responsibilities of a supervisor?
• It ___ possible to suffer a severe injury when blindly reaching into a toolbox.
• Which statement about partitions in a multi-gang switch box is true?
• A surge-protection device is required to be installed on a feeder in all of the following locations except for ___.
• Which statement describes a permitted use for flexible cords?
• A 7200 to 4160 V three-phase transformer 150 kVA in a supervised location is fed from a feeder tap protected by a three-phase fused safety switch. The transformer supplies power to a circuit breaker in an enclosure. According to NEC 450.3, the maximum size of the circuit breaker in the enclosure is ___ amps.
• For a high-voltage transformer installation, how many strands of barbed wire are required on top after extending the fence by 1 foot?
• Which of the following is not allowed to act as a concrete encased electrode?
• Under the optional method for a single-family dwelling, general loads beyond the initial 10 kW are calculated at a ___ percent demand factor.
• A qualified electrical testing laboratory ___ electrical products to provide a basis for approval by inspectors in the field.
• Which statement best describes the ventilation openings calculation for transformers rated over 50 kVA?
• Panelboard rating for incoming service 277/480?
• A feeder is tapped and a circuit breaker in an enclosure protects the tap. The transformer is 4160 to 2400 V, three-phase, 225 kVA with 4% impedance, located in a nonsupervised location, and it supplies a three-phase main breaker panelboard. Under NEC 450.3, the maximum size of the circuit breaker in the CB enclosure is ___ amps.
• Plate electrodes shall be at least ___ inches thick when made of nonferrous metal.
• One type of router is a ___ router.
• Hooks, slings, and associated hardware used for mechanical lifting must ___.
• Service-entrance or feeder conductors whose demand load is determined by the optional calculation are permitted to have the neutral load determined by 220.61.
• When operating at different speeds, a motor may be required to deliver ___ to a driven load.
• What is the minimum demand for a single branch-circuit serving one 4 kW cooktop and two 5 kW wall-mounted ovens?
• A sustained increase in temperature can reduce the life of a transformer by what percentage?
• Generally, the grounding electrode conductor shall be ___ without a splice or joint.
• If THREE individual, single-pole breakers are handle tied and used for a 3Ø circuit, which statement is true?
• The largest 1-pole circuit breaker that can be used to protect a 12 AWG copper Type SJO flexible cord is ___ A.
• What is the recommended maximum voltage drop percentage across feeders and branch circuits?
• Which statement best describes the purpose of grouping conductors by color (blue, black, red, white) within the conduits?
• A VFD's ability to maintain performance through the full speed range is described as maintaining what?
• Metal guy wires used to support turbine towers are ___ required to be connected to an equipment grounding conductor.
• NEC Article 722 addresses which category of circuits?
• Many hand tools have a(n) ___ design and can prevent musculoskeletal injuries when properly used.
• In a multi-source system feeding a bus from multiple sources, equipment containing which type of devices in circuits shall be marked to indicate the presence of all sources?
• What size Schedule 40 PVC is required for eight 6 AWG XHHW conductors?
• Programmable controllers ___ be configured in a system using a personal computer.
• EOL refers to ___.
• Which type of cord can be used on portable appliances?
• In a three-bedroom circuit described as having issues with bedroom 2 while bedroom 3 has none, neutral coming apart in bedroom 2 switchbox is suspected. What is the most plausible fault location?
• Although in the early stages, an intended use of ___ charging is on streets to charge fleet vehicles, such as buses.
• What is the total nameplate load (in kW) of two 3 kW cooktops and two 5 kW ovens?
• For the motor sizing example, the minimum conductor size is
• Each plate electrode shall expose not less than how many square feet of surface to exterior soil, and shall be installed not less than how far below the surface of the earth?
• A ground ring must be at least ___ feet long.
• NEC Table 722.135(B) covers which of the following?
• In locating access points for buried limited energy cables during testing, repair, or rerouting, which technology is commonly used?
• The minimum thickness for ferrous metal faceplates is 0.030 inches.
• To qualify for a residential journeyman electrician license without attending apprenticeship school, the applicant must have at least how many hours of full-time work experience as a licensed Apprentice Electrician?
• The overall usable length of the cable for cord-connected EVSEs is not to exceed 25 feet unless the listed EVSE is equipped with a ____.
• The minimum concrete cover required for a conduit carrying service entrance conductors under a building to be considered outside is measured in inches and equals 2 inches.
• Safety discussions should include weather conditions because weather affects decisions about clothing and planned tasks.
• In Scenario 230.26, what device serves as the disconnecting means for the motor?
• In vibration analysis, why is it important to identify peaks that repeat?
• Aerial lift equipment includes ___ lifts.
• Most electric vehicle charging stations charge by the ___.
• Which statements describe rules for trenching and excavation operations?
• Which enclosure rating provides corrosion resistance and protection against water ingress suitable for washdown areas?
• The maximum number of 4/0 THWN/THHN conductors that can be installed in an 8 by 8 by 5 ft gutter is which value?
• Firestop materials can be used to seal which areas?
• A VFD is made up of the following except for ___.
• Materials ___ emit thermal energy well.
• In intrinsically safe apparatus, sealing conduits and cables is to minimize passage of gases, vapors, or dusts.
• A(n) ___ inverter has the capability of operating as either off-grid or grid-tied.
• What is the minimum trade size Schedule 80 PVC that can be installed up a wooden pole that is 20 feet tall containing four 500 kcmil conductors and one 1/0 AWG ground, all THHN/THWN copper?
• Can a dedicated (individual) branch circuit share a neutral with other circuits in a multiwire branch circuit according to the NEC?
• A fire protection triangle includes which systems?
• Table 400.4 in the NEC can be used to find which of the following?
• A single receptacle installed on an individual branch circuit shall have an amp rating not less than ___ percent of the rating of the branch circuit.
• The best plan is to prevent exposing employees to hazardous materials. One method is to
• On construction sites, NEC requires that all 125-volt, 1Ø, 15-, 20-, and 30-amp temporary receptacles have what protection?
• Overcurrent protection for feeders and branch circuits supplying EVSE shall be sized for ____.
• In building automation, which device is commonly used to present data or control panels to technicians?
• Enclosed ___-type luminaires shall be installed in ducts or plenum chambers used to transport environmental air when illumination is necessary for maintenance and repair.
• In a 400-A main breaker panelboard fed from a transformer with a single conduit containing four 500 kcmil conductors, what is the smallest size copper wire permitted to be used as the main bonding jumper?
• Which statement is true about a fuel cell electric vehicle?
• Which camera type is typically used for covert surveillance and may be hidden from view?
• Which inverter type is described as interacting with the utility grid to coordinate power exchange?
• The parallel conductors in each phase or neutral shall ___.
• What is the primary purpose of a Visual Fault Locator (VFL) in fiber optic testing?
• What does PoE stand for in networking and lighting applications?
• An interconnection agreement is a legally binding contract between which parties?
• In Class II Division 1 locations, which wiring methods are approved for use?
• What is the maximum length of cord for a trash compactor?
• Under the rule for applying the 75% demand factor to EVSE, which condition is necessary?
• What is the maximum pulling force for Category cable?
• In Scenario 230.26, what is the motor horsepower?
• Which combination best describes safety signs used internationally?
• Service disruptions are often a result of ___.
• What type of voltage does PoE use to power low voltage devices over Ethernet cables?
• The misuse of a laser can cause ___.
• NEC generally permits a circuit breaker to carry what percent of its rating when supplying a load not operated more than 3 hours?
• A ___ is a type of programmable controller. I. PLR II. PBC III. PAC
• When working with a new employee on a jobsite, you can assume he knows ___ about safety procedures and practices.
• What is the smallest volume junction box that can be used for a configuration with conduits #1 and #4 each containing twenty-four 10 AWG wires, conduits #2 and #5 each containing twelve 6 AWG wires, conduits #3 and #6 each containing sixteen 8 AWG wires, and all conductors are wire-nutted inside the box with grounds equal to the circuit conductors?
• AC drives can vary the speed of a motor using which configuration?
• NEC Article 805 covers which circuits?
• Which statement best describes NEC provisions for flexible cords?
• If a 7-unit condo has a total minimum small-appliance load of 21,000 VA, what is the implied per-unit small-appliance load?
• Motor drives can increase the speed of a motor without reducing ___.
• When a motor's starter coil energizes but the motor does not start, which issue is most likely?
• Which standard is used to determine the motor branch circuit fuse size?
• With regard to Greater Hazards, which of the following is not an example of increased or additional hazards according to OSHA 1910.333(a)(1) Note 1?
• Which eyewear option is not part of the recommended eye protection when making fiber optic terminations?
• The IEC defines DC voltages between 0 and 120 volts as which category?
• Which of the following best describes the allowed disconnecting means for fixed appliances under NEC rules when not over 300 VA?
• In the context of transformer protection, if a transformer has 3% impedance, which percentage describes its impedance?
• ___ rating is the highest current at rated voltage that a device is identified to interrupt under standard test conditions.
• Which class of fire extinguisher is used for kitchen grease fires?
• Type TC power and control cable may be used ___.
• A hermetic refrigerant motor-compressor's branch-circuit short-circuit and ground-fault protective device shall be capable of carrying what percent of the motor's starting current?
• Which color group is used for neutral conductors in the described wiring scheme?
• ___ is scheduled at regular intervals.
• Regarding intrinsically safe labeling distances, which is true?
• Where circuits from the input or output terminals of energy storage components pass through a wall, floor, or ceiling, a disconnecting means shall be provided within sight of the energy storage component and be ___.
• For voltages of 1000 or less, individual open service conductors in dry locations should be separated by how many inches?
• Which THHN/THWN copper conductor is the smallest size permitted for a feeder with a 200-amp breaker in a single-family dwelling?
• When feeder conductors share a common neutral and are installed in a metal raceway, they must be enclosed within the same raceway.
• Where separate equipment grounding conductors and supply-side bonding jumpers are installed in a dry-type transformer enclosure, which of the following is required for all grounding and bonding conductor connections?
• For interconnected electric power production sources, where the power source output connection is made to a feeder, the ampacity of the feeder must be greater than or equal to ___ the power source output circuit current.
• A ___ is also called an 'all-electric' vehicle.
• The disconnecting means of an ESS shall be legibly marked in the field to indicate the following except for ___.
• A ___ is equipped with a power-limiting source, thus reducing the potential for a large fault current.
• Which type of maintenance is performed to prevent failures by replacing components before they fail?
• Not more than how many gallons of combustible liquid may be stored in any one approved storage cabinet?
• NEC® Article ___ covers cables for power-limited circuits and fault-managed power circuits.
• Is the conduit between the street lighting poles covered by the NEC? The street lighting and conduit were installed in the utility easement as shown in the drawing at the right and is under the control of the utility company.
• In dwelling unit general lighting load calculations, which areas are not included in the floor area for the calculation?
• Each piece of HVAC equipment controlled through building automation has its own?
• What height above floor is specified for energized parts inside control cabinets used for fire pump systems?
• What is the term for the compartment that connects an air handling unit to the ductwork in an HVAC system?
• Underground service grounded conductors shall be insulated except ___.
• How many circuits does the 42-Circuit Panelboard HB contain?
• For 1/0 AWG copper conductors in a vertical raceway, the maximum spacing is which of the following?
• An arc-fault protective device that recognizes arcing characteristics and de-energizes the circuit when an arc fault is detected is called what?
• If the impedance of the ground-fault current path is too high, what is a likely consequence?
• The ability of an overcurrent device to safely open under fault conditions is referred to as its ___ rating.
• Small drives that control three-phase motors can be supplied with which power configurations?
• Apparent power is measured in ___.
• A(n) ___ allows for two-way communication.
• Who is commonly responsible for safety training on a construction site?
• What is the total nameplate load (in kW) of two 3 kW cooktops and one 5 kW wall-mounted oven?
• ___ creates dynamic growth.
• Which hazard type, upon contact with skin, can cause severe skin damage?
• Fiber optic innerduct is orange in color to indicate it is ___.
• Proof of your training to operate a laser ___ by OSHA officials.
• Supplementary overcurrent devices shall not be required to be ___.
• ___ show hotter temperatures as dark red and cooler temperatures are shades of blue.
• The conductors for a standby generator shall be sized not less than ___% of the generator's nameplate rating.
• Wind electrical systems include components such as ____.
• In a standard delta-connected three-phase system without a neutral, there is no neutral conductor.
• Flexible cords and cables used to connect the moving parts of turbines shall be.
• If you witness a collapse and you are trained, which action sequence is recommended?
• A branch circuit provides power to a receptacle in bathroom #1 in a dwelling. This branch circuit is permitted to also provide power to ___.
• Gloves that are too large can ___.
• Which type of interference does shielding reduce in PoE lighting circuits?
• IDC stands for ___.
• Only ___ are permitted to perform construction, maintenance, and interconnection requirements for wind electric systems found in the NEC.
• NAND logic uses ___ switch contacts for connection to programmable controller input terminals.
• Six metal device boxes ganged together to form a 6-gang box. One GFCI receptacle, four single-pole switches, and one motion switch will be installed in the box assembly. The box assembly contains four ungrounded conductors, five grounded conductors, five switch legs, and six grounding conductors. Five cable clamps are contained in the assembly. All the conductors are 12 AWG. Each of the ganged boxes is required to be 3" × 2" × ___ inches.
• The NEC® specifies that tamper-resistant receptacles be installed in ___.
• You are installing a GEC to the main water line from a 200-A, main breaker Panel LC. ___ AWG is the largest size copper wire required. As shown in the data, the panel is fed from a transformer with one set of 3/0 AWG wire.
• NAC stands for ___.
• Under NEC, which article covers communications circuits?
• The surface supporting a forklift must be rated to support the weight of the ___.
• Which system tends to consume the majority of power in a building?
• Which conductor type must be present in each switch box or enclosure according to NEC requirements?
• What voltage should a meter indicate when measuring the line side and load side of a B fuse inside a 600-volt disconnect when the disconnect is on and the system voltage is 480/277?
• To interconnect equipment grounding terminals across panelboards serving the same patient care vicinity, the copper conductor must be at least which gauge?
• What is the minimum size (3 wire + ground) SO cord that could be used as a flexible connection for the motor supplied from a 120/240-volt, 3Ø, 4-wire panelboard?
• What term describes a leader who fosters trust, openness, and collaboration within a team?
• What is the minimum thickness of the sealing compound in a one-inch sealing fitting?
• A ___ location is a location in which volatile flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are handled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containers or closed systems from which they can escape only in case of accidental rupture or breakdown of such containers or systems or in case of abnormal operation of equipment.
• Where a service mast is used for the support of service-drop conductors, it shall be of adequate strength or be supported by ___.
• Recessed luminaires that are not identified for contact with insulation must be kept at least how far from combustible materials?
• When equipment listed for charging electric vehicles requires ventilation for indoor charging and is supplied by a 60-amp branch circuit and operates at 240 volts three-phase, the minimum mechanical ventilation for the total number of vehicles that can be charged at one time is ___ cfm.
• AC - DC general use snap switches may be used for control of inductive loads not exceeding ___% of the rating at the voltage.
• Which of the following would be considered an OUTPUT device in a control circuit?
• In an area used for patient care, Type MC cables shall have an outer metal sheath that is ___ as an acceptable grounding return path. I. listed II. identified III. approved
• A transformer vault is installed on the 3rd floor of a high-rise building and is not protected by an automatic fire suppression system. What is the minimum floor fire rating required?
• The purpose of connecting the main bonding jumper is to ___.
• Which listed conductor has a greater ampacity in a dry location compared to a wet location?
• In a 277/480-volt, 3Ø, 4-wire system, the line-to-line voltage is 480 V.
• A telescopic material handler ___ rated to lift a maximum load.
• A(n) ___ is a power quality event where there is a very brief period of reduced voltage, from sub-cycle to 60 cycles in length.
• The minimum number of branch circuits in a dwelling is found in which NEC section?
• In the NEC, which article specifically governs fire alarm systems?
• Which of the following conductor installations are in locations that are considered to be wet?
• Which statement about hand signals on a jobsite is true?
• Which description best matches the requirement to qualify for the license without attending apprenticeship school?
• The EVSE can be subjected to the 75% demand factor provided the dwelling has at least four fixed in place appliances. This statement is:
• Which of the following is not a personality trait?
• Which of the following factors influences sling selection: environmental conditions, load type, or load size?
• ___ energy is the amount of instantaneous heat energy produced by an arc flash.
• What is the maximum size standard size overcurrent device permitted for a 3-phase 460-volt 75 HP fire pump when the nameplate reads Code letter "J" and FLA of 93 amps?
• Which NEC Article covers cables for power-limited circuits and fault-managed power circuits?
• The neutral loads supplied by the panel will not exceed 310 amps; the neutral in each conduit must be at least a ___ AWG or kcmil.
• A single receptacle installed on an individual branch circuit shall have an amp rating not less than ___ percent of the rating of the branch circuit.
• When sealing a penetration in a fire-rated wall using a specific caulk, which alternative could complete the seal if the specified product is unavailable?
• Conductors of AC or DC circuits rated 1000 volts AC, 1500 volts DC, nominal, or less shall be permitted to occupy the same conduit if ___.
• PoE exclusively functions over ___ because the powered devices are localized.
• For purposes of the NEC®, interior metal water piping is considered to be exposed when installed above a lay-in ceiling.
• A primary reason for equipment grounding is to provide an effective ground-fault current path. The impedance of the grounding path is directly related to the amount of time a fault exists before the OCPD operates. When impedance is higher, the fault lasts ___ time.
• The equipment grounding conductor connecting the normal and essential branch-circuit panelboards serving the same patient care vicinity must be not smaller than which gauge?
• For the installation in Figure 230.252, the smallest BC conductors permitted are ___ AWG or kcmil.
• For a suspended personnel platform, the ___ shall determine that all systems, controls, and safety devices are activated and functioning properly.
• Where used in the NEC®, the term shall not indicates that an action is ___.
• The wind turbine shutdown procedure must be defined and permanently posted at the shutdown location and at the disconnect or turbine controller if the locations differ.
• What is the minimum distance to keep surcharge loads from the edge of a trench?
• The maximum switch port power in a PoE++ Type 4 system is ___.
• Which of the following listed conductors has a greater ampacity when used in a dry location compared to when used in a wet location?
• Which statements describe uses of firestopping products?
• Which statement is true about torque in a VFD-controlled motor across the speed range?
• Hand injuries caused by powered tools with sharp blades or rotating parts ___ be prevented by wearing cut-resistant leather gloves.
• Which class of fires includes flammable liquids, grease, gasoline, and oil-based paints and thinners?
• Safety discussions on a jobsite should include local weather conditions because these conditions can affect decisions concerning __. I. suitable clothing II. planned tasks or operations.
• A motor is controlled by a start/stop station. The operator pushes the start button. The starter energizes, but the motor does not run. This is more likely a ____ problem.
• The largest permitted ITCB breaker for Motor 1 is what amperage?
• After conducting an inspection, it is important to document ___.
• A ___ recharges its battery through using regenerative braking or by plugging-in to an electric vehicle charging station.
• Uninsulated exposed parts, such as electrical conductors, buses, terminals, or components, shall operate at not more than ___ volts in wet locations in Class III, Divisions 1 and 2 locations.
• For farm buildings, the load for feeders, service conductors, and service equipment shall be computed using the demand factors of Table 220.102(B) when the load is supplied by how many branch circuits?
• If PoE cable length surpasses ___, data signals will degrade.
• What is the minimum size box or box assembly required to contain: Two 10/2 with ground MC cables, one 12/2 with ground MC cable, a 30-amp 240-volt single receptacle, and a 20-amp 120-volt single receptacle?
• Which of the following is an example of a crimp lug fitting?
• In workplace safety, mishandling of materials is the single largest cause of accidents and injuries. Which option best represents this statement?
• Section 404.2(A) NEC requires switching be done only in the ___ conductor.
• For temporary installations, Type NM and Type NMC cables shall be permitted to be used in any dwelling, building, or structure, up to a maximum height of ___ feet.
• NEC® Article ___ covers communications circuits.
• What voltage should a meter indicate between phase A and phase C on a 240-volt delta system?
• Hearing protectors should___.
• Electric vehicle charging ports are characterized by what key feature?
• Each secondary winding of a transformer delivering 120/208 volts on its secondary supplies 120 volts.
• Which Table 300.5 row should be used for underground conduit under a building?
• A fused safety switch installed in a Class II Division 2 location shall be ___.
• A ground ring must be installed with a minimum length of ___ feet.
• What helps when troubleshooting circuits?
• Lubricating machines ___.
• ___ are potentially infectious.
• Before entering a trench excavation, who must inspect the site?
• Dry-type transformers installed indoors rated over 35,000 V must be installed in a vault.
• Output voltages to electric vehicles: which statement is true?
• Which of the following best describes service-drop conductors?
• In a center-tapped 240 V single-phase service, the voltage between the two hot legs is
• Which statement about noise-reduction on construction sites is supported by the material?
• The conductors in Conduit II are protected by a circuit breaker of what type and rating?
• Most transformers used outside North America are designed for which standard distribution frequency?
• How many conductors are contained in each conduit in the 210.10 example?
• If smoke detectors are mounted on a wall, they should be installed between ___ and ___ inches from the ceiling?
• Which statement about the main bonding jumper is true?
• Per NEC, the branch circuit for a fire alarm system is required to be supplied by which?
• Nursing homes and limited care facilities require two separate branches for essential services. Which pair are they?
• When a nongrounded-type receptacle is replaced with a GFCI receptacle that supplies no other outlets, what labeling must be applied to the GFCI?
• Which of the following is a correct eye-protection requirement for fiber optics?
• What is an advantage of PoE?
• Which electrical component is used to decrease primary voltage to a lower voltage for control circuits?
• Which term describes the process of terminating copper cables into a jack using insulation displacement?
• The NEC requirement for generators is that they shall be of a type suitable for the ___ in which they are installed.
• When installed underground with only earth and grass as cover, polyvinyl chloride conduit must have a minimum of ___ inches of cover.
• In a PoE system, power and data are delivered over what?
• Which option best describes the smallest box assembly required to house a duplex receptacle fed by MC cables with two hots and two neutrals?
• XIC input in ladder logic is represented by which contact?
• The branch circuit comprises which of the following?
• A disconnecting means of adequate capacity for at least ___ percent of the input required for the momentary rating or ___ percent of the input required for the long-time rating of medical X-ray equipment, whichever is greater, shall be provided in the supply circuit.
• Between the disconnect and a boiler, copper conductors must be of which insulation rating?
• Which tool is primarily used to strip the protective jacket from fiber optic cables prior to termination?
• The PV disconnecting means location requirement is that it must be readily accessible.
• A circuit breaker feeds a 480 to 240/120 V single-phase transformer rated 750 VA. This transformer supplies 240/120 V three-wire to a fused safety switch. Per NEC 450 Article, what is the maximum fuse size allowed to be installed in the safety switch?
• In a dual-conduit installation for a 3-phase system, with three 350 kcmil conductors in each parallel run and a 600-A circuit breaker, what is the smallest EGC gauge allowed to be installed in each conduit?
• A ___ is a minimum or starting point used for comparison.
• In data presentation, which element shows trends over time by connecting data points with lines?
• In a conduit with 9 conductors, Load #3 uses 6 AWG and the 133°F high-temperature rating applies to its current-carrying capacity. What is the current rating of Load #3 wire according to the problem data?
• Fiberglass ladders are preferred around exposed energized conductors because they are nonconductive.
• Which system is designed to allow two-way communication inside a building and is distinct from a public address system?
• One benefit of using building automation technologies is ___.
• In typical pole-mounted transformers, the windings are surrounded by which coolant?
• Electrical systems that are required to be grounded are connected to earth in a manner that will limit the voltage imposed by ___.
• Which device is an initiating device?
• UPS stands for what?
• The smallest permitted size system bonding jumper for Panel LK is AWG ___.
• The maximum allowable ampacity of a 750 kcmil XHHW aluminum conductor is ___ amps when there are six current carrying conductors in the raceway, the raceway is installed in a wet location, and the ambient temperature surrounding the raceway is 22°C.
• What is a key requirement for the disconnecting means in typical residential installations?
• The load ratings of a suspended personnel platform ___.
• When inspecting fiber rope slings before use, which conditions should be checked?
• Conducting an annual elevator inspection is an example of ___.
• For fire pump circuit protection, the required rating is 125% of the fire pump motor full-load current and 100% of the associated fire pump accessory equipment.
• The small-appliance and laundry loads shall be included with the general lighting load and subjected to the demand factors provided in NEC Table 220.45.
• Which of the following is considered a personality trait?
• The smallest THHN/THWN copper grounded conductor for a service is ___ when the ungrounded conductors are 1/0 THWN/THHN copper and the load on the neutral is expected to be 120 amps.
• A motor controller enclosure that is subject to occasional prolonged submersion shall be NEMA type ___.
• If a 11/4" EMT raceway containing three conductors is already filled to 20% of its allowable fill, what is the raceway’s remaining conduit fill cross-sectional area in square inches?
• When conductors are run in parallel between a generator and a distribution panelboard, how many conduits are used?
• Under the optional method, the 40% demand factor for electric space heating applies to how many separate units?
• In weather-exposed service raceways, which construction is specified for enclosing service entrance conductors and allowing drainage?
• Installing phase conductors, neutral conductors, and equipment grounding conductors of a circuit together in the same metallic raceway is required to avoid induction that causes which effects?
• In the described conduit arrangement, the 8 AWG conductors in Conduit I are which type?
• Under what conditions may equipment grounding conductors be run in parallel?
• To prevent explosive gas accumulation from energy storage devices, which measures are recommended?
• The refrigerator may be on a separate 15-amp circuit; which citation indicates Exception 2?
• In a 3-gang masonry box stamped at 47.4 in3 that will contain two 4-way switches and one 3-way switch, with eleven 12 AWG THHN/THWN conductors terminating on the switches and no EGCs installed, how many additional 12 AWG conductors may be pulled through this box unspliced and unlooped?
• A ___ uses regenerative braking and its internal combustion engine to recharge.
• Under NFPA 70E, which statement about troubleshooting and diagnostic activities requiring an energized electrical work permit is true?
• What article in the NEC addresses fire alarm systems?
• The Code rules and provisions are enforced by ___.
• The definition of a branch circuit is ___.
• The continuity of a grounded conductor shall not be dependent upon the device in ___.
• The device that converts AC input to DC within a motor drive is the
• If it is impractical to locate the service head above the attachment point, the maximum distance between them is?
• Firestopping products and materials include which of the following?
• ___ is used in audio, phone, video, communication, and data applications.
• Which cable is used for high-bandwidth data transmission with light signals?
• For temporary installations, required tests for the assured equipment grounding conductor program shall be performed at intervals not exceeding ___ month(s).
• An EMT raceway carries a 1/0 AWG copper insulated grounding electrode conductor from the service-entrance equipment across the ceiling to an underground water pipe. Which description best matches code requirements for this EMT raceway?
• As the noise level increases, the decibel level ___.
• Which type of camera is designed to be mounted on a ceiling and aimed downward using mounting hardware?
• The largest 3-pole circuit breaker that can be used to protect a 12 AWG copper Type SO flexible cord is ___ A.
• For a motor drive, the control and drive functions are controlled by ___.
• Low distortion loads correct harmonics within devices such as which of the following?
• No hanging luminaire parts can be located within a zone measured 8 ft vertically from the top of the bathtub rim and 8 ft vertically from the top of the shower stall threshold. Which description matches this zone?
• Flexible cords and cables shall not be ___.
• An electrical service is grounded to ___.
• Prior to any demand factors being applied, the minimum small-appliance branch circuit load for a 7-unit condo would be ___.
• What is the minimum clear space between the top of the open-bottom switchboard and a plywood ceiling?
• The identification of the grounded conductor in a flexible cord shall be permitted to be by ___.
• On a jobsite, wearing gloves that are too small may ___.
• In a 480Y/277 V system, the voltage from a phase conductor to neutral is
• A 15-amp, single-phase circuit runs from the panel to a bedroom and only energizes all receptacles and the lighting. Assuming proper wiring, what voltage reading would be plausible when measuring the receptacle neutral conductor to ground?
• In troubleshooting, how should you proceed to gather information?
• Which value is used to determine the minimum circuit ampacity for the unit as listed on the nameplate?
• In Class III locations, circuits for electric cranes operating over combustible fibers shall not be ___.
• Which wiring methods are approved for fixed wiring in an area above Class I locations in a major repair garage?
• In a 120/240-volt, 1Ø, 3-wire system, the circuit connected to the A-phase conductor is designated as AØ.
• An optical time domain reflectometer (OTDR) provides information on which of the following?
• Flammable or combustible liquids are not permitted to be stored in ___ used by people for safe egress.
• A 45 kVA, 480 to 208Y/120-volt dry-type transformer is located in front of a plywood telephone equipment board attached to the wall. The minimum clearance from the transformer to this combustible wall covering is:
• This type of hazard is poisonous and can cause sickness or death. Exposure occurs through inhalation or physical contact.
• A show window is calculated at which VA per linear foot?
• Where accessible to other than qualified persons, a means shall be provided to disconnect a(n) ___ associated with ESS equipment where it is energized from both directions.
• ___ is a bloodborne pathogen.
• As appropriate to the energy storage technology, provisions shall be made for sufficient ___ of any possible gases from the storage device, if present, to prevent the accumulation of an explosive mixture.
• In general, a building or structure shall be supplied by only ___ service(s).
• A 240V clothes dryer located in a finished basement laundry room requires which protection?
• Before using any type of aerial lift equipment, you should inspect the work area for the presence of ___.
• The return current of nonlinear loads can cause ___ of the voltage waveform.
• The service disconnecting means shall plainly indicate which of the following?
• In temporary wiring, NM and NMC cables may be used in dwellings with no height limitation. True or False?
• Arc flash protective clothing with a rating of 4 cal/cm2 is intended for which hazard risk category?
• Unsupported runs of armored cable shall be permitted to be unsupported where the cable is not more than ___ inches at terminals where flexibility is necessary.
• OSHA requires hearing protection when working in an area where the noise level is ___ dB or above.
• Which of the following conductors are permitted by the NEC® to be installed in the same raceway with the service entrance conductors?
• Open service conductors or multi-conductor cable without an overall jacket shall have a clearance of not less than how many feet from windows, doors, or similar locations that open?
• Which statement correctly describes the classification criteria for flammable versus combustible liquids?
• The impedance percentage of a transformer (for example 8%) primarily influences which of the following related protections?
• A single-family dwelling contains three ovens rated at 6 kW, 8 kW, and 3.5 kW; a cooktop rated at 6 kW; and a broiler rated at 3.5 kW. What is the minimum demand for the ungrounded service entrance conductors?
• A very brief period of increased voltage, from sub-cycle to 60 cycles in length, is called a ___.
• Which term describes interference at the transmit end of a twisted-pair cable from a transmit pair to an adjacent pair, as measured at the far end?
• Which term describes an arrangement of PV modules fixed at a tilt angle?
• When field terminating an output cable to an electric vehicle, which cord or cable is an acceptable flexible means for the installation?
• In the United States, on average, construction-industry back injuries are ___% higher than back injuries reported from other industries.
• Which motor parameter often must be reprogrammed for a specific installation, even though most parameters are factory programmed?
• A PV string is ___ or more PV panels connected in series.
• Which of the following statements correctly describes the protection requirement for temporary receptacles on construction sites?
• PV cells are made of ___.
• Tamper-resistant receptacles are required in which locations?
• In a temporary installation, flexible cords and cables shall be protected from accidental damage. Sharp corners and projections shall be avoided. Where passing through doorways and other ___, protection shall be provided to avoid damage.
• In these motor conductor sizing scenarios, terminations are rated at what temperature?
• In a minor repair garage, the space below a ventilated pit used for lubrication and servicing is classified as what?
• The rapid shutdown label's title must have a minimum height of at least 3/8 inch.
• Can NEC permit splicing of short branch wires with wire nuts to reach the breaker?
• Emergency action safety planning for a construction job includes the posting of a floor plan in a conspicuous location. This floor plan should show the locations of ___.
• In a panel with an upper 250 A breaker feeding Load 1 and a lower 400 A breaker feeding Load 2, one conduit runs from the panel to a pull box with 250 kcmil conductors for the 250-A breaker and 500 kcmil conductors for the 400-A breaker. The smallest EGC permitted in this conduit is which AWG?
• Type SO cord has ___ insulation.
• You installed a 3-pole, 300-A breaker in a panel and ran 3 AWG circuit conductors to a motor. The smallest EGC you can run with the circuit is which AWG?
• Multiple PV cells create a PV ___.
• ___ is a healthcare facility space in which failure of equipment or a system is likely to cause minor injury to patients, staff, or visitors.
• ISO 50001 is a standard intended to improve energy use through a(n) ___.
• A trench excavation must be inspected by a competent person under which circumstances?
• Which option best describes the EVSE service feeder load calculation outcome?
• Dry-type transformers installed indoors rated over what voltage must be installed in a vault?
• In dwelling load calculations, what is the purpose of applying demand factors?
• Transformers with ventilating openings must be installed so that the openings are not blocked by walls or obstructions. The required clearance shall be:
• Which conduit diameter is the largest among G, H, J, K, L, M, N?
• What is the locked rotor current of a 3-phase 460-volt 40 HP fire pump when the nameplate states Code letter "F" and FLA of 54 amps?
• Under NEC, which article covers optical fiber cables?
• Which term describes a controller that integrates PLC logic with advanced control features in a single unit?
• To prevent water from entering service equipment, service-entrance conductors must
• Which of the following disconnecting means is permitted for a 240-volt, single-phase water heater?
• Maximum number of 120-volt, general-purpose receptacles the NEC permits to be placed on a 20-amp, 120-volt, single-pole breaker in a commercial building.
• Among the transformer ratings present in the scenarios, which is the largest?
• What gauge is used in conduit number 2 in the described arrangement?
• Which of the following is an unsafe act on a jobsite?
• Fuses installed for motor branch circuits are typically dual-element time-delay because these OCPDs can hold which current for a short period of time to allow the motor to start?
• For 1" LFMC, the maximum distance from a box to the first support strap is ___ ft.
• Workers are permitted to work beneath suspended loads when which condition would apply?
• Which enclosure type is required for luminaires installed in ducts or plenums used to transport environmental air?
• The Grand Canyon at night has a decibel level of about ___.
• A motor is controlled by a start/stop station. The operator pushes the start button. The motor starter makes odd noises and heats up. This is more likely a ___ problem.
• If the minimum dimension for Y is halved, what is the new value in inches?
• Using a ___ allows a patch cable to connect the electronic equipment to the network wiring.
• Harmonics cause undesired current on electrical systems, leading to overheating. Which term describes this current?
• What device keeps batteries from overcharging by regulating voltage and current from solar panels to the battery?
• If a person with a simple broken bone is moved, ___.
• ___ is the ratio of the actual power delivered by a load divided by the input power required by the load to operate.
• Refer to a transformer that supplies 120/208 volts on its secondary windings. This means that each winding (X1 to X2 or X3 to X4) is supplying ___ volts.
• A ___ changes primary voltage to lower voltage.
• ___ have a much longer life cycle than lead-acid batteries and offer reasonable energy and power capabilities.
• Motor drives provide energy savings when used with ___ loads.
• A(n) ___ is used to perform a fast termination method referred to as 'insulation displacement'.
• Which of the following is NOT typically considered a component of wind electric systems per NEC?
• A disconnecting means was installed for an ESS to disconnect it from all wiring systems it is connected to. The disconnecting means was installed within sight from the ESS. The disconnect is not permitted to be installed ___ feet away from the ESS.
• Which device is defined as a solid-state control device that is programmed and reprogrammed automatically to control an industrial process?
• The minimum size aluminum feeder conductors for a post office requiring a 125-amp subpanel is ___.
• HDPE conduit larger than what size shall not be used?
• Which programming method is used to program PLCs in manufacturing environments?
• When the optional method is used, a demand factor of ___ is permitted to be applied to the calculated load of a 15-unit multifamily dwelling.
• Which of the following provides clearance requirements from walls for proper ventilation of transformer enclosures?
• Per NEC®, the 120-volt circuit supplying power to a fire alarm system must be ___.
• A ___ charger may be approached from either side as up to two docking stations may be mounted to it.
• Which term describes a condition that indicates a fault needing maintenance, but is not an actual alarm or supervisory?
• Which device uses maximum power point tracking to improve the output of each solar module in a PV array?
• A multiwire branch circuit from a 120/240-volt 1Ø, 3-wire panelboard will be used to supply power to a double single-pole switch. The NEC® requires that a multiwire branch circuit supplying more than one device or equipment on the same yoke have a means to simultaneously disconnect all ungrounded conductors at the panelboard where the branch circuit originated. This means that ___ can be used to disconnect the circuits from the receptacle.
• Plug-in-type overcurrent protection devices or plug-in-type main lug assemblies that are ___ shall be secured in place by an additional fastener that requires other than a pull to release the device from the mounting means on the panel.
• What is the minimum fire resistance rating for transformer vault walls?
• In a programmable logic controller (PLC), the components such as inputs, outputs, timers, and counters are typically what type of elements in the control circuit?
• A single large building may be provided with two or more separate services if permitted by which of the following?
• Using the optional calculation method, what is the VA total for the 'general loads' in a 2,500 sq ft dwelling with the following loads? 2 - Small-appliance branch circuits 1 - Laundry branch circuit 1 - 1 kW dishwasher 1 - 5.5 kW clothes dryer 1 - 1,600 VA pump motor 1 - 7.5 kW electric range
• The smallest conductors permitted to be run, paralleled in two separate conduits, between a 3Ø, 250 kVA generator and a 480-volt distribution panelboard are which size?
• Outdoor storage tanks for flammable or combustible liquids shall be kept at least ___ feet from a building.
• Under the horsepower requirement rule, the motor nameplate must list horsepower when the motor is at least ___ hp.
• A bathroom with a counter space length of 7 feet including the sink requires how many receptacles?
• When operating a telescopic material handler, as the boom is extended, the load capacity ___.
• Service heads shall have conductors of different potential brought out through separately ___ openings.
• Which color is orange for innerduct?
• Standards of power quality include the following:
• Each state and local jurisdiction may have different requirements for licensing.
• Which wireless protocol is commonly used for low-power, short-range home automation devices?
• For each farm building or load supplied by how many branch circuits is the load computed using the demand factors of Table 220.102(B)?
• Which of the following is not required on a motor nameplate?
• In raceways, which conductors must be stranded?
• The load for a required sign branch circuit shall be computed at a minimum of which value?
• In a raceway containing 30 current-carrying conductors, the ampacity of each conductor is reduced to ___ percent of that for a single conductor?
• Voltage taps on the primary are used to accommodate input voltage variations.
• For lubrication service rooms in minor repair garages to be unclassified, mechanical ventilation must provide how many cubic feet of air per minute per square foot of floor area?
• Which of the following is an example of discrete manufacturing?
• There are two primary types of ___ chargers: single-phase (7.2 kW-11 kW) and three-phase (22 kW).
• A 120/240-volt, 3Ø, 4-W open-delta bank delivers power to a load. The line current equals ___.
• Voltage taps on a three-phase transformer are ___.
• In the indoor installation described, the smallest wires that can be connected to the transformer primary are which size?
• Wall-mounted strobes should be mounted between which heights above the finished floor?
• In a Category 1 space operating room, what is the minimum number of receptacles required?
• Which of the following are components of an emergency action plan for a construction job?
• Which of the following is NOT an example of a racking system?
• A transformer secondary tie is a circuit opening at ___ volts or less between phases that connects two power sources or power supply points.
• Great coaches promote all of the following except ___.
• For small air conditioner motor-compressors, fused protection may be used if the protective device rating is not more than what percentage of the motor's rated current?
• Which hazard category includes materials that can cause tissue damage via chemical action such as erosion?
• Which statement is correct regarding bonding a grounding conductor when using EMT from service to a water pipe?
• The NEC® does the branch-circuit conductors for a range to be sized at less than the nameplate rating of the range.
• A code letter D is marked on a motor nameplate. What is its locked-rotor kVA per horsepower?
• When making fiber optic terminations, which eyewear feature is specifically recommended?
• When overcurrent devices are selectively coordinated and a fault occurs somewhere on a branch circuit, what should happen?
• Parking garages are considered to be ___ locations.
• LED lights flickering may be a symptom of harmonics on a power system.
• In a VFD, which component converts DC voltage back into AC to drive the motor?
• When a ladder is identified as unsafe, what is the appropriate action?
• Wall-mounted audible devices must be mounted so the top of the device is at least ___ below the ceiling and the top is at least ___ above the finished floor level.
• The rapid shutdown initiation for a single PV system shall occur by the operation of any single initiation device, which may include a ___.
• Which NEC article completes labeling requirements for PV systems along with 690?
• Where wires pass through an opening in an enclosure, conduit box, or barrier, which shall be used to protect the conductors from sharp edges within generators?
• Which percentage is used to calculate the minimum feeder-circuit conductor size by applying the continuous load percentage?
• A 120/240-volt, 1Ø, 3-wire system is commonly known as what?
• For service and feeder calculations, the EVSE load shall be calculated at either ___ or the nameplate rating of the equipment, whichever is larger.
• An A(n) ___ changes DC voltage into AC voltage.
• Which location is not typically considered process manufacturing?
• In PLR, two inputs connected in parallel perform which Boolean operation?
• Sizing the grounded conductor for feeders can involve adding percentages of loads. Which combination is permitted?
• Which of the following is a feature of Level 2 charging?
• A ___ switch is permitted to be used to control a 277-volt fluorescent lighting circuit.
• In wireless charging, the device external to the electric vehicle that transfers power via contactless coupling is called the:
• A fault code displayed on a motor drive could indicate a(n) ___.
• Which statement is true regarding PVC ambient temperature limits?
• To protect occupants from carbon monoxide, which measure is essential?
• Stairwells shall contain visible signals for evacuation.
• ___ is the use of automation and controls systems to monitor and control building wide systems.
• A pulse width modulator converts DC voltage into ___.
• A light over top of a set of stairs works some of the time but not always. What could be a possible reason for this fault?
• Before use, an alloy steel chain sling should be checked for ___.
• What is the maximum interval, in months, for testing the assured equipment grounding conductor program in temporary installations?
• In a motor start/stop circuit, which of the following would be a plausible root cause if the motor runs slowly and trips the overload after pressing the start button?
• A PV module is made up of many PV cells.
• To work on energized circuits, electricians are required to
• ___ is/are generally the producers of harmonics on electrical systems.
• DETD fuses in the feeder are used to provide what function?
• The optional method of calculation is permitted for a multifamily dwelling if which conditions are met?
• Which safety switches are permitted to be used as the disconnecting means for a 240-volt, 1Ø water heater?
• Cables in conduit with a gas/vapour tight continuous sheath capable of transmitting gases or vapors through the cable core shall be sealed in Division 1 after removing the jacket and coverings.
• The cover plates for receptacles supplied from the hospital's essential electrical system must have a distinctive ___ to be readily identifiable.
• Eye protection for fiber optic work should include which of the following?
• A ___ is a Wi-Fi enabled device with a switch that plugs into a standard receptacle.
• Vertically-mounted switches shall be ___ when in the up position.
• Installation of electrical power production sources operating in parallel with a primary source(s) of electricity shall be performed ___ by qualified persons.
• A blown fuse will appear ___ on a thermal scan.
• In a control circuit, which devices are typically connected to the output terminals to indicate alarms or status?
• Many of the components in ___ batteries are recyclable.
• When examining equipment for safety, it is the intent of the Code that ___ internal wiring or the construction of equipment need not be inspected at the time of installation of the equipment if the equipment has been listed by a qualified electrical testing laboratory.
• In a conduit, the 8 AWG copper ungrounded conductors are permitted to be stranded. Which option correctly matches this requirement?
• In the described generator setups, the distribution panelboard is fed from a generator that provides what voltage?
• In a 480 V three-phase system, the line-to-line voltage is
• Which type of power system has a transmitter at the power source and a receiver near the load, constantly monitoring circuit parameters and able to open the circuit in the event of a fault?
• Which conduit diameter is the smallest among G, H, J, K, L, M, N?
• Which of the following is NOT an example of actuation of fire alarm control equipment?
• In wireless EV charging, the device outside the vehicle that transfers energy via contactless coupling is called the:
• When a 3Ø, 4-W supply system delivers 277/480 volts, the system has line-to-line voltages that are ___ volts.
• Sustainable energy includes ___.
• The floor plan used in an emergency action plan should include which elements?
• What is the maximum overcurrent protection rating allowed on infrared heating lamps used on commercial or industrial applications?
• Triplen harmonics are harmonics divisible by which number?
• What does ampacity describe?
• Among work-related injuries treated in emergency rooms, hand and finger injuries are the ____ numerous.
• In a circuit, loose conduit couplings and connectors can affect the opening time of an OCPD in which condition?
• Conductor size units between a generator and a distribution panelboard can be expressed as which of the following?
• Plate electrodes of nonferrous metal shall be at least ___ in thickness.
• Which statement best describes the role of the end-of-line resistor in a fire alarm loop?
• Sling training should enable workers to perform which of the following?
• Which camera type is designed to be hidden from view?
• Electric equipment shall be installed in a professional and ___ manner.
• Equipment grounding conductors shall be permitted to be installed outside a raceway or cable assembly.
• An office building has a calculated receptacle load of 65 kVA, what is the permitted demand for these receptacles?
• Which action would not be considered a greater hazard under OSHA 1910.333(a)(1) Note 1?
• Are all conductors wire nutted inside the box in the small junction box example?
• LONtalk is a communication network similar to which standard used in building automation?
• Per NEC®, the circuit disconnect means for a fire alarm system shall have red identification and be identified as ___.
• When replacing an existing two-wire nongrounded receptacle where no equipment grounding conductor exists, which option is permitted?
• A receptacle with a green dot on an ivory face is which type?
• What is the minimum number of receptacles required in a basement with three separate unfinished areas, each with a perimeter of 30 feet?
• For a transformer rated below 600 volts with coordinated thermal overload protection, the primary overcurrent protection may be set at up to what percent of the transformer's rated current for a transformer with 8% impedance?
• Which electrical phenomenon can be introduced into a power system by using VFDs?
• In a damp or wet location, a metal switch enclosure must be spaced at least how much from the mounting surface?
• For a three-phase wye system, the line-to-line voltage equals the line-to-neutral voltage times the square root of 3.
• When ergonomics is utilized, ___.
• Safety protocols ___ eating and drinking in the work area when handling fiber optic cable.
• Which standard governs energized electrical work permits and arc flash boundaries?
• Service entrance cables, where subject to physical damage, shall be protected by which of the following? I. EMT II. IMC III. RMC
• The main function of capacitors in the DC bus of an AC motor drive is to ___.
• For a feeder supplying household cooking equipment and electric clothes dryers, the maximum unbalanced load on the neutral conductor shall be considered as ___ of the load on the ungrounded conductors.
• Assigning a new employee to work ___ is a good method to provide him with training and guidance in working safely on a jobsite.
• Which PoE designation contains the highest per-port power in the described system?
• In an emergency action plan, which item would be considered a hazard that could prevent or impede an orderly exit?
• NEC® Article ___ covers audio signal processing, amplification, and reproduction equipment.
• Which of the following locations would require GFCI protection for receptacles, according to the provided guidelines?
• Which item is not required on a motor nameplate according to the material?
• Under NEC, the generator frame and motor frame must be bonded to the equipment grounding conductor unless they are effectively insulated from ground and the motor driving it.
• What is the product of the minimum dimensions for X and Y (in square inches)?
• A VFD is a type of motor controller that varies the ___ and ___ supplied to an electric motor in order to control its speed.
• The use of programmable controllers eliminates the need for ___.
• In Panel II, the busbars are ___ conductors.
• NEC Article 640 covers which equipment?
• What is the minimum permitted distance, in inches, between the two 3-inch conduits in the layout where all conductors enter from the right and exit the bottom?
• A transformer rated ___ kVA or larger shall be provided with a nameplate giving the name of the manufacturer, rated kVA, frequency, primary and secondary voltage, and the impedance of the transformer.
• Among the options for the indoor installation, which is the conductor size specified as the transformer primary?
• Metal studs, saw blades, razor knives, and the like are sharp surfaces and could be contaminated with bloodborne pathogens.
• A liquid-filled transformer has a primary voltage of 12,470 volts and is surrounded by a 6-foot-high fence. The fence height must be extended 1 foot with at least how many strands of barbed wire on top of the fence?
• In PLR, two inputs connected in series perform which Boolean operation?
• In the indoor installation, what is the purpose of the wireway (gutter)?
• In a circuit feeding thirteen lighting fixtures rated at 1.25 A each (LEDs drawing 90W per fixture), the minimum conductor size is
• Switches and circuit breakers used as disconnecting means to appliances shall be ___?
• In a service grounding system, which of the following is a grounded conductor?
• The recommended maximum total voltage drop on both feeders and branch circuits is ___ percent.
• There are ___ basic I/O symbols used in the programming diagrams for programmable controllers.
• Circuits for electric cranes operating over combustible fibers in Class III locations shall not be ___.
• Preventing crosstalk requires which measures?
• Interior metal water piping located more than ___ ft from the point of entrance to the building shall not be used as a part of the grounding electrode system.
• Which of the following is an acceptable protection technique for hazardous locations as listed in the material?
• Which statements are true about flexible cords?
• For a 3/4-inch Schedule 40 PVC conduit, the minimum support distance is ___ feet.
• An electrode that does not have a resistance to ground of ___ ohms or less shall be augmented by one additional electrode.
• Which statement best describes passing cords through doorways or openings in temporary installations to avoid damage?
• Overhead service locations: If it is impractical to locate the service head above the point of attachment, the point of attachment shall be no further than how many inches from the service head?
• A 15-amp, single-phase circuit runs from the panel to a bedroom and only energizes the receptacles and the lighting in that bedroom. Assuming proper wiring, what is a plausible voltage reading when measuring the receptacle phase conductor to ground?
• A refrigerator receptacle in a dwelling can be fed from a ___.
• In a 120/208 V, 3-phase, 4-wire system, what is the voltage from phase A to neutral?
• The first action to take when another person is seriously injured is to ___.
• Which of the following items could be hazardous and cause an injury if stored in a toolbox?
• A fire pump is permitted to be supplied by ___ the main distribution (service) panel.
• Which of the following is not an element of an energized electrical work permit?
• The following are examples of racking and support systems except ___.
• The maximum size fuse for the primary of a 480 to 240 V, 1Ø, 15 kVA dry-type transformer is:
• Given a 3 AWG THHN copper conductor with two current-carrying conductors in the raceway, ambient temperature 35 C, terminations rated at 60 C, the ampacity is ___ amps.
• The shallowest 4 in by 2-1/8 in device box permitted for a setup with one hot, one neutral, and one EGC, with all conductors 14 AWG THHN/THWN, is which of the following?
• A branch circuit is supplying a single hermetic refrigerant motor-compressor for an air conditioning unit. If a 30-amp fuse will not start the motor-compressor, the maximum rating of the branch-circuit short-circuit and ground-fault protective device may be increased to ___.
• The overall usable length for cord-connected EVSEs can be extended beyond 25 Feet if the equipment is equipped with a ____.
• A rate of rise heat detector will respond when the temperature rises at a rate exceeding a predetermined amount, usually about ___ degree(s) per ___.
• Each patient bed location in Category 1 space shall be provided with at least ___ receptacle(s).
• In power electronics, what is the function of an inverter?
• Three branch circuits with separate neutrals passing through four-foot fluorescent fixtures connected end-to-end are allowed to be installed under NEC?
• NEC 300.4(E) requires that boxes and raceways installed under roof decking be which?
• A 240V clothes dryer located in a finished basement laundry room requires which of the following?
• If the disconnecting means for EVSE rated greater than 60 amps is located in a remote location from the equipment, which combination of statements is required?
• Which parameter is commonly adjusted to control the startup behavior of a motor via a VFD?
• The key to taking written exams is to
• The general categories of harmonic producing nonlinear loads are some of the following except for ___.
• Three ungrounded and one grounded conductor are installed in a single conduit from a 120/208 V, 3-phase, 4-wire panelboard. By NEC, these conductors are a multiwire branch circuit.
• Taking multiple passes over an exam is an effective test taking technique if
• For an outdoor water filtration receptacle, what type of cover should be installed?
• In general, there shall be a means provided so that, upon loss of voltage from the utility, energy cannot be backfed through the electric vehicle and the supply equipment to the premises wiring system unless the ESVE is part of a(n) __.
• What is the minimum feeder demand for a 17 kW range?
• The feeder originates from a 120/240-volt, 3Ø, 4-W switchboard or panelboard. This description describes the feeder as being what type of supply?
• During thermal imaging of electrical equipment, the equipment should be operated at or above what percent of nominal load?
• In no case shall conductors in cablebus be smaller than which AWG?
• There are ___ methods to bond telecommunications racks to a building's grounding system.
• A bathroom in a dwelling has a counter space of 7 feet including the sink. How many receptacles are required to serve this area?
• Which standard is commonly used to enable interoperability among building automation devices?
• If the minimum dimension for X is doubled, what is the new value in inches?
• A(n) ___ is a solid-state control device that is programmed and reprogrammed automatically to control an industrial process or machine.
• For a 3-phase, 208-volt, continuous-duty motor of 10 horsepower, the conductor ampacity is approximately which value?
• In building automation wiring, cables range from which gauge?
• A converter changes AC voltage into DC voltage using ___.
• A(n) ___ circuit breaker has an intentional delay between the time the overload is sensed and the time when the breaker operates.
• When selecting a VFD for an application, which item is not typically a consideration?
• PV Modules intended for use in PV systems shall be ___ or be evaluated for the application and have a field label applied.
• ___ protectors are gloves worn over rubber insulating gloves to prevent damage to the rubber glove.
• A new central air-conditioning unit is to be installed to replace an old one. The nameplate information is 1Ø 240 volts MCA 29.7 MOCP 40-A fuses. The existing circuit has 8 AWG NM cable connected to a 50-amp breaker and a fused safety switch near the unit. Which action is acceptable?
• Which NEC section addresses sensor (automatic) control of lighting in a residential bathroom?
• Which conduit type is not listed as acceptable for use in a concrete slab?
• What is the largest 1-pole breaker allowed for a 12 AWG copper Type SJO flexible cord?
• Fixture wire on a 30-amp branch circuit is permitted to be ___.
• BACnet is ___.
• Which camera type is described as modular, allowing component interchange?
• What does TIA stand for in the context of telecommunications standards?
• Which factor primarily limits data signal reliability in PoE when the cable is too long?
• The Code has assigned the color ___ to the high-leg of a 4-wire delta-connected secondary.
• What is the minimum dimension for X in inches?
• Monocrystalline solar cells are typically more expensive due to their what structural characteristic?
• A 240-volt, 3Ø feeder supplies power to four motors. Motor 1 is 50 hp, motor 2 is 40 hp, motor 3 is 30 hp, and motor 4 is 10 hp. The minimum size feeder conductors permitted are ___.
• VFDs can be programmed to ___ an electric motor.
• Which of the following best describes the protection arrangement for the conductors described as Conduit II being protected by a three‑pole 80‑amp circuit breaker?
• In a 120/240-volt, 3Ø, 4-W open-delta bank delivering power, the line current equals the winding current.
• Temporary power installations are permitted during which of the following activities?
• A ___ converts communication protocols from one format to another.
• Overhead service conductors shall have a minimum clearance from final grade of 24½ feet when installed over which location?
• OSHA Cranes and Derricks standard addresses which aspects of suspended personnel platforms?
• The operable part of a fire alarm pull station must be mounted between which two floor inches?
• Each apartment in a 30-unit apartment complex has a 2 kW water heater. Using the optional method, what is the demand on the service for these water heaters?
• Which hazard category is commonly associated with materials that may ignite or explode under heat or pressure?
• ___ shows temperatures as gradients. Hotter temperatures are brighter and cooler temperatures are darker.
• The top of a wall-mounted audible device must be at least 6 inches below the ceiling and 90 inches above the finished floor.
• NABCEP® stands for ___.
• Which of the following safety considerations often influences planning and attire on a jobsite due to weather?
• Which loads are typically used as fixed appliance loads in dwelling calculations?
• Safety protocols regarding eating and drinking in the fiber optic work area are to ___.
• ___ is necessary for an organization to function.
• A very long underground branch circuit in Schedule 40 PVC runs from a 120/208-volt, 3-phase, 4-wire panel to the load. The branch-circuit conductors are connected to a 30-A circuit breaker. The conductors are 2 AWG. The smallest EGC that can be installed in the PVC is ___ AWG.
• Three bedrooms on the same circuit. Bedroom1 is closest to the panel, then bedroom2, then bedroom3. The overhead light and receptacles work in bedroom1. The overhead light does not work but all receptacles work in bedroom2. Nothing works in bedroom3. What's the most plausible reason for this fault?
• When the hoist of a traveling crane is to be raised, you should signal by which gesture?
• In infrared thermography, which property is most directly associated with the rate of energy emission from a surface?
• Mishandling of materials is ___ of accidents and injuries in the workplace.
• The conductors at Point II are ___.
• A 20-foot or lesser height with a hinge base means handholes are not required. Which option matches this height?
• For a one-family dwelling, the service disconnecting means shall have a rating of not less than ___ amps, 3-wire.
• In general, how many service(s) should supply a building or structure?
• A ventilated pit in a minor repair garage for heavier‑than‑air fuel is considered unclassified provided there is ventilation of at least 1 ft3/min/ft2, where exhaust air is evaluated at a point within how many inches of the floor?
• A 5 HP 208V fire pump is operating 15% above its full load current rating. What is the minimum voltage at the contactor terminals per the NEC®?
• Which item is the most dangerous hazard to eye safety during fiber optic work?
• A(n) ___ is not required if the limited approach boundary is crossed only for visual inspections and the person performing inspection will not cross the restricted approach boundary.
• For lighting circuits, NEC Section 404.2(C) requires a(n) ___ conductor to be provided in each switch box or enclosure.
• A pendant luminaire mounted in a clothes closet is which?
• Which activity is representative of preventive maintenance for electrical systems?
• Where a transformer vault is not protected by an automatic fire suppression system, the minimum fire rating for the roof is how many hour(s)?
• A motor controlled by a start/stop station runs slowly and then trips the overloads. This is most likely a power problem.
• A single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of ___ or less shall be augmented by one additional electrode.
• Which statement about outdoor luminaires attached to trees is true under NEC?
• Which item is not typically included as a standard component in a PLC control circuit?
• Which device is commonly used to mitigate harmonic currents in a circuit?
• The smallest branch circuit conductor size permitted in a given installation is 2/0 AWG. Which of the following lists that size among the options?
• To save the life of someone who collapses from sudden cardiac arrest, which statement is correct?
• For a 480 V, 3-phase, 60 Hz air compressor, which safety switches are permitted as the disconnecting means?
• Which device can be attached to a network so file storage can be a separate device on the network?
• Which factor is most important when choosing gloves for manual handling tasks?
• Pull stations are typically mounted at which height range from the floor?
• A dedicated circuit feeds a light in a dwelling. The light never works. What could be a possible reason for this fault?
• For a panel with a 175-A main breaker and service entrance conductors of 2/0 AWG, what is the smallest size permitted for the main bonding jumper?
• What is the minimum clearance from the bottom of a pole-mounted 240-V transformer to the ground?
• An example of a harmonic solution that is commercially available would be a(n) ___.
• An unventilated pit or depression below the floor level in a major repair garage is considered to be what location, extending up to the floor level where Class I liquids, hydrogen, natural gas, or LPG are transferred?
• An AC motor drive is underpowered or overloaded when the difference between full-load voltage and no-load voltage at the output terminals exceeds what percent?
• Which of the following is not an initiating device?
• Chapters 5, 6, and 7 of the NEC relate to:
• For a safety switch installed near a motor with the maximum permitted DETD fuses, when the smallest permitted circuit conductors are used between the switch and the motor, the smallest size EGC permitted is which AWG?
• The minimum number of 120-volt, 15-amp lighting circuits required for a dwelling with a 70 × 30 ft floor area is
• What is the minimum feeder demand for twelve single-phase 12 kW ranges supplied by a 3-phase, 4-wire 120/208 V feeder?
• A receptacle installed outdoors in a location protected from the weather or in other damp locations shall have an enclosure for the receptacle that is ___ when the receptacle is covered.
• Which label should be applied to an unsafe ladder?
• The arc rating is the value the describes materials' performance to an exposure of an electrical arc discharge.
• For buried limited energy cable, which reference point is often used to locate access points for testing, repair, or rerouting?
• Which color is standard for a neutral conductor in most residential wiring?
• Formal interpretations of the Code may be found in which publication?
• In a 3Ø panelboard with vertical busbars, the CØ feeder conductor is connected to the busbar on which side?
• A 120V clothes dryer located in a finished basement laundry room requires which of the following circuit protections?
• For interconnected electric power production sources, when a phase opens, the output shall be automatically disconnected from all ungrounded conductors. Which side of the protection equipment should the output connect to?
• For service and feeder calculations, EVSE load shall be calculated at either 7200 VA or the nameplate rating of the equipment, whichever is larger.
• In a dwelling, what is the minimum width of a wall space that requires a receptacle outlet?
• PoE uses ___ for powering low voltage lighting sources and controls them using pulse-width modulated signals over the same Ethernet cable.
• Which statement describes the licensing prerequisites for eligibility without attending apprenticeship school?
• A switch or circuit breaker should disconnect all grounded conductors of a circuit ___.
• Which practice helps maintain ladder stability?
• In a general discussion of panelboard conductors, which statement is true?
• PLCs are modular and consist of which of the following parts?
• What is the correct color to use for an intrinsically safe conductor?
• Which term best describes conductors that run from the main service to a distribution point or subpanel?
• For a programmable controller, the most common I/Os are ___.
• If a transformer is protected by a code letter on its nameplate and a FLA value, which pieces of information are used to size the overload protection?
• Refer to Figure 208.51. The minimum calculated dimension for left-to-right length of the box is ___ inches. All conductors enter the right side of the pull box and exit the bottom. Conduit G = 3", H = 3 1/2", J = 6", K = 3", L = 4", M = 2", N = 2 1/2"
• Conduit can be ___ and provides a pathway for the limited energy wires to run through walls and ceilings and from floor to floor.
• Which class of fires involves combustible metals such as magnesium or sodium?
• Panelboards supplied through transformers shall have their overcurrent protection located on which side of the transformer?
• Where provided with a disconnecting means listed as suitable for service equipment, and where overcurrent protection is provided, an interconnected electric power production source is permitted to connect to a service through a(n) ___.
• Conductor protection for fire pump motors: the protective device shall be rated at not less than what percent of the motor's full-load current?
• In a 120/208-volt 3-phase, 4-wire system, the nominal voltage between any two hot conductors is
• In your home, you should have which safety items?
• ___ may be connected ahead of service switches. I. Surge arrestors II. Cable limiters
• In a tapped feeder scenario with a 4160 to 2400 V three-phase transformer 225 kVA in nonsupervised location, Z = 4%. The transformer supplies a 3Ø fused safety switch. The fuses can have rating not more than ___ amps.
• A ___ is responsible for the maintenance and upkeep of a building or facility and ensuring the building or facility meets legal requirements and health and safety standards.
• A bare conductor can be used for a grounding electrode conductor where it is installed between a service panel and a steel beam that is part of the building structure.
• Which statement about instantaneous-trip breakers is true?
• Splicing branch wires to extend reach— NEC permits?
• According to OSHA regulations, posted warning signs ___ required in an area when lasers are in use.
• Only containers that ___ shall be used for the storage and handling of flammable and combustible liquids.
• The NEC is intended to safeguard from hazards arising from the use of electricity. Which statement best reflects this purpose?
• True or False: Transformers are required to be marked with a minimum clearance for ventilation.
• Two separate secondary windings rated at 120/240 V on a transformer have a total rating of 10 kVA. Each winding is rated at ___ kVA.
• In a fire alarm system, a defined area within the protected premises that is monitored as a single unit is called a
• Which device category is typically used to prevent fault-related damage in PoE and lighting systems?
• The ___ is focused on wireless personal area networks and is typical for home automation.
• Which term describes the long conductors that run from the service equipment to the distribution equipment?
• Which boundary is the most restrictive among the exposure boundaries referenced, and is crossed only by qualified personnel?
• The return current of nonlinear loads can cause what kind of distortion in the voltage waveform?
• A dedicated circuit feeds a light in a dwelling. The light is on all the time. What could be a possible reason for this fault?
• If a 3-pole, 300-A breaker feeds a motor and 3 AWG conductors are run to the motor, the smallest EGC gauge is which?
• A 300-amp breaker feeds a 225 kVA transformer whose secondary leads go to a panelboard with a 200-amp main; the secondary run is 13 feet. The conductors must be at least which size?
• Where practicable, contact between dissimilar metals anywhere in the system shall be avoided to eliminate the possibility of ___.
• Which connector is commonly referred to as RJ45 plug?
• When circuit conductors are installed in conduit between the disconnecting means and the fire pump, both located within the building, these conduits shall be ___.
• Which of the following best describes a corner-grounded delta connection?
• For interconnected electric power production sources, when one or more phases of the primary source opens, the output of interactive electric power production equipment shall be automatically ___ all ungrounded conductors of the primary source.
• Which PPE term defines the ability of equipment to withstand an arc flash without failure?
• Which device uses maximum power point tracking to improve output of each solar module?
• Green main bonding jumper screws furnished with residential type panels should be installed in ___.
• A network switch with a PoE-enabled port is an example of a(n) ___.
• Five 10 AWG THHN/THWN copper conductors are installed in a conduit in an area where the summertime temperature is 138ºF. What is the maximum size OCP permitted to protect the conductors in the conduit?
• Which NFPA standard specifically addresses arc flash safety, risk assessment, and labeling?
• Smoke alarms and smoke detectors shall not be installed within ___ feet from a stationary or fixed cooking appliance.
• Nontime-delay fuses with a rating of ___ A are the largest permitted to be installed in a disconnect switch for a motor.
• What is the primary purpose of a motor drive?
• A fused switch is permitted to be located ___.
• Which chapters apply generally unless modified by later chapters?
• Home automation systems may consist of many systems that are connected to one another ___.
• Which statement about ventilation in major repair garages is true?
• Which device creates connections between two fiber optic cables to ensure continuity of communication between telecommunication devices?
• When should emergency action safety planning for a construction project begin?
• For those who work in the construction trades, ___ is/are a major cause of hearing loss.
• Positive feedforward is a term used to offer suggestions of what to do in the___.
• The minimum left-to-right length of the pull box, given the current conduit arrangement, is what value (inches)?
• If the ungrounded service conductors are 1/0 AWG copper, what is the minimum size of the grounded conductor?
• Sound masking is typically found in ___.
• Both AC and DC motor drives are used to control the ___ of a motor.
• NEMA Type 3 enclosure provides protection against windblown dust.
• Which of the following is an advantage of using VFDs?
• Which statement correctly describes support for a service mast used to support service drops?
• The optional calculation can be used to find the total ampacity of a multifamily dwelling with natural gas cooking equipment.
• The NEC requires that receptacles be installed so that the grounding slot is located on the ___.
• X-ray equipment installed in a hospital may be served by a hard-service cord with a suitable plug provided the branch circuit rating does not exceed ___ amps.
• In a fire-rated assembly, which statement is true about firestop products?
• Which practice most consistently strengthens supervisory effectiveness?
• For eight 5.5 kW dryers using the standard method, the line-to-neutral loads are respectively 26,400 VA and 18,480 VA. What is the approximate ratio of line to neutral loads?
• The disconnect for a fire-protection water pump may be remote from other disconnects.
• For two to six disconnects, where should they be grouped?
• What is the fixed appliance load (line and neutral) for a single-family dwelling with the following loads supplied from the same feeder? Water heater - 4000 VA at 240V; Dishwasher - 1300 VA at 120V; Food waste disposer - 1100 VA at 120V; Trash compactor - 950 VA at 120V; Attic fan - 1176 VA at 120V.
• Which conduit material is specified for weather-exposed service enclosures?
• For a transformer vault located on the 2nd floor of a high-rise building, the minimum fire rating of the door into the vault is how many hours?
• In a 120/208 V three-phase system, what is the voltage between phase A and neutral?
• What is the minimum general lighting load for a 60,000 sq-ft warehouse?
• The entrance chain (or gate) on a scissor lift ___.
• A 15-amp, single phase circuit runs from the panel to a bedroom and only energizes all the receptacles and the incandescent light in that bedroom. Assuming everything is wired and working correctly, what voltage reading would be plausible when you measure the line side of switch to load side of switch? (switch is on)
• Which event most often leads to service disruptions?
• What should you assume about a new employee's safety knowledge?
• The ampacity of type UF cable shall be that of ___ conductors.
• What is the typical distance from a stationary cooking appliance to a smoke alarm?
• When inspecting a fiberglass ladder for safety, which issues should you check for?
• ___ detect motion and ambient light levels.
• NEC Article ___ covers energy storage systems.
• Which statement about grounding electrodes is true?
• Where 32 amps is flowing in circuit conductors protected by a 30-amp breaker, this is an example of which condition?
• Which pair constitutes the two mandatory branches of a hospital essential electrical system?
• In a pull box where all conductors enter the left side and exit the bottom, what is the minimum top-to-bottom length (inches)?
• The disable command is used primarily ___.
• In a programmable controller circuit, to which type of terminal are relay coils typically connected?
• What is the maximum number of 4 AWG THHN conductors permitted in 11/2" RMC?
• Pin 6 in a T568B wiring pinout corresponds to which color wire?
• You are upgrading a central air unit from a 30-amp circuit to one rated at MOCP 40 A. The unit nameplate shows MCA 29.7 A. Which action is permitted when upgrading the protection?
• An extended interruption of AC power is called a(n) ___.
• Conduits shall be considered outside a building when installed under which condition?
• For bathroom receptacles, which combination of protections is required?
• Which Table 300.5 row addresses cover requirements for underground conduit located under streets, highways, roads, alleys, driveways, and parking lots?
• What is the rating of the circuit breaker protecting Conduit II conductors?