The rapid shutdown initiation for a single PV system shall occur by the operation of any single initiation device, which may include a ___.

The rapid shutdown initiation for a single PV system shall occur by the operation of any single initiation device, which may include a ___.

• A. cord-and-plug disconnecting means
• B. service disconnecting means
• C. readily accessible SPDT switch
• D. PV monitoring system

Answer: (B)

Rapid shutdown is designed so that a single control can quickly de-energize the PV array conductors within a short time. A single initiation device must be able to interrupt the PV power at a readily accessible point, effectively isolating the PV system from the building’s electrical system. A service disconnecting means fits this role because it is the standard, widely accessible switch that can cut power to the entire PV system from the utility side of the point where the system connects to the building. Using this single device ensures a straightforward, reliable way to initiate shutdown for safety. Cord-and-plug disconnects aren’t universally applicable to all installations and aren’t guaranteed to meet the required rapid-shutdown setup in every configuration. A readily accessible SPDT switch could work if installed as the initiation point, but the service disconnect is the most common, consistently recognized option that satisfies the single-point control requirement. A PV monitoring system merely provides status and control signals and does not physically interrupt power, so it doesn’t meet the initiation requirement.

Rapid shutdown is designed so that a single control can quickly de-energize the PV array conductors within a short time. A single initiation device must be able to interrupt the PV power at a readily accessible point, effectively isolating the PV system from the building’s electrical system. A service disconnecting means fits this role because it is the standard, widely accessible switch that can cut power to the entire PV system from the utility side of the point where the system connects to the building. Using this single device ensures a straightforward, reliable way to initiate shutdown for safety.

Cord-and-plug disconnects aren’t universally applicable to all installations and aren’t guaranteed to meet the required rapid-shutdown setup in every configuration. A readily accessible SPDT switch could work if installed as the initiation point, but the service disconnect is the most common, consistently recognized option that satisfies the single-point control requirement. A PV monitoring system merely provides status and control signals and does not physically interrupt power, so it doesn’t meet the initiation requirement.