CSLB C-46 Solar ContractorElectrical and Plumbing CodesMedium
A solar installer is planning a rooftop photovoltaic (PV) system installation for a residential property. The system includes a main service panel, a PV inverter, and a dedicated PV disconnect switch. According to the California Electrical Code (CEC), what is the maximum permitted length of the supply-side PV output circuit conductors from the PV disconnect to the service disconnecting means before overcurrent protection is required at the point of connection?
- A3 feet
- B25 feet
- C10 feet
- D5 feet
Show answer & explanationAnswer & explanation
Correct answer: C. 10 feet
The California Electrical Code (CEC) specifies a maximum length of 10 feet for supply-side PV output circuit conductors from the PV disconnect to the service disconnecting means before overcurrent protection is required at the point of connection. This ensures proper protection against overcurrents for longer runs.
Why the other options are wrong
- A. This length is too short; the CEC allows for longer runs under specific conditions.
- B. This length is too long; overcurrent protection would be required at the point of connection if the conductors exceed 10 feet.
- D. This length is too short; the CEC allows for longer runs under specific conditions.
CEC PV Supply-Side Connection Length
The maximum permitted length of supply-side PV output circuit conductors from the PV disconnect to the service disconnecting means before overcurrent protection is required at the point of connection, as per CEC.
- Applies to supply-side PV connections.
- Limit is 10 feet.
- Exceeding 10 feet requires overcurrent protection at the connection point.
Memory trick: Ten feet is the golden rule for PV supply-side length, or else protection's due.