How does the NEC treat solar photovoltaic systems in relation to utility interconnection?

How does the NEC treat solar photovoltaic systems in relation to utility interconnection?

• A. PV systems are exempt from NEC interconnection requirements when connected to the grid.
• B. PV systems must comply with NEC Article 690 (and 705) requirements for interconnection and overcurrent protection; rapid shutdown requirements are in 690.12.
• C. PV systems only require compliance with Article 310 for conductors.
• D. PV systems must follow NFPA 70E guidelines for safety in interconnection.

Answer: (B)

Solar PV interconnection is governed by NEC rules that apply specifically to PV sources and their connection to the building and the utility. The PV system must comply with Article 690, which covers how PV equipment, conductors, backfeed protection, disconnects, and labeling are installed. When the PV system is connected to the utility and operates in parallel, Article 705 provides requirements for the interconnection point, backfeeding, and protection coordination. In addition, rapid shutdown safety is addressed in 690.12, requiring PV conductors to be de-energized rapidly to reduce shock hazards for emergency responders and workers. NFPA 70E relates to electrical safety in the workplace and does not govern interconnection, and Article 310 deals with conductors sizing rather than interconnection specifics. So, interconnection with the utility must follow NEC provisions in 690 (and 705), with rapid shutdown requirements in 690.12.

Solar PV interconnection is governed by NEC rules that apply specifically to PV sources and their connection to the building and the utility. The PV system must comply with Article 690, which covers how PV equipment, conductors, backfeed protection, disconnects, and labeling are installed. When the PV system is connected to the utility and operates in parallel, Article 705 provides requirements for the interconnection point, backfeeding, and protection coordination. In addition, rapid shutdown safety is addressed in 690.12, requiring PV conductors to be de-energized rapidly to reduce shock hazards for emergency responders and workers. NFPA 70E relates to electrical safety in the workplace and does not govern interconnection, and Article 310 deals with conductors sizing rather than interconnection specifics. So, interconnection with the utility must follow NEC provisions in 690 (and 705), with rapid shutdown requirements in 690.12.