Quick Answer
You can install rooftop PV without complying with NEC 690.12, but it's crucial to ensure compliance with local building codes, permits, and inspections. Local jurisdictions may impose stricter requirements than the NEC, so it's essential to verify their regulations. In some areas, homeowners may be exempt from NEC requirements.
Understanding NEC 690.12
NEC 690.12 outlines the requirements for rapid shutdown systems (RSS) in rooftop PV installations. An RSS is designed to quickly disconnect the PV array from the electrical system in the event of a fire, preventing electrical shock or additional fuel for the fire. The NEC standard specifies a maximum residual voltage of 1.2 kV at the point of disconnection.
Complying with Local Regulations
Some jurisdictions may not require compliance with NEC 690.12, but it’s essential to verify local building codes and regulations. Homeowners may be exempt from NEC requirements if their PV system is below a certain capacity (e.g., 10 kW in some areas). However, it’s crucial to ensure compliance with local electrical codes and permitting requirements.
Alternative Solutions
If you cannot or do not want to comply with NEC 690.12, you can consider alternative solutions, such as using a PV array that meets the UL 1741 standard for rapid shutdown. These arrays are designed to disconnect from the electrical system quickly in the event of a fire, providing a safer alternative to traditional PV systems. However, it’s essential to verify that these alternative solutions meet local building codes and regulations.
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