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) __.

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) __.

• A. Emergency system
• B. Egress system
• C. Communications system
• D. Interactive system

Answer: (D)

The main idea is preventing backfeeding energy into the building wiring when the utility power is lost. If a storage or vehicle-to-grid system could push energy back through the EVSE and into the premises, it creates a serious safety hazard for anyone working on the lines outside. To avoid that, the ESVE must be part of an interactive system. An interactive system is designed to coordinate with the utility and the building so energy exchange is controlled and the system can island from the building during an outage, preventing backfeed to the premises. The other options don’t address this interconnection and safety requirement: an emergency system is about powering essential loads with its own separate source, while egress and communications systems are not about preventing backfeed.

The main idea is preventing backfeeding energy into the building wiring when the utility power is lost. If a storage or vehicle-to-grid system could push energy back through the EVSE and into the premises, it creates a serious safety hazard for anyone working on the lines outside. To avoid that, the ESVE must be part of an interactive system. An interactive system is designed to coordinate with the utility and the building so energy exchange is controlled and the system can island from the building during an outage, preventing backfeed to the premises. The other options don’t address this interconnection and safety requirement: an emergency system is about powering essential loads with its own separate source, while egress and communications systems are not about preventing backfeed.