What is required for rapid shutdown of PV systems as stated in Section 690.12?

The requirement for rapid shutdown capabilities in photovoltaic (PV) systems, as stated in Section 690.12 of the National Electrical Code (NEC), focuses on enhancing safety during emergency situations, such as when first responders are required to engage with the electrical systems of a building. This regulation ensures that electrical hazards are minimized by providing a means to quickly disconnect or reduce the voltage in the system.

By equipping PV systems with rapid shutdown capabilities, the system can effectively limit the presence of live conductors and reduce risks of electric shock or electrocution. This is critical in emergency scenarios, where fire department members or other emergency personnel need to access the roof or areas surrounding the PV system safely.

The other options do not directly address the critical need for providing an immediate and effective method to reduce electrical hazards associated with PV systems. A secondary power source, manual shutdown switch, or restrictions on installation types, while they may offer some safety features or operational functionality, do not fulfill the specific requirement outlined in NEC 690.12 for rapid shutdown to enhance safety directly.