CSLB C-46 Solar ContractorElectrical and Plumbing CodesMedium
A solar contractor is planning the installation of a new rooftop PV system for a residential client. The system will be connected to the supply side of the existing service equipment. According to the National Electrical Code (NEC), what is the maximum permissible distance from the utility service conductors for the PV supply-side connection?
- A18 inches
- B12 inches
- C6 inches
- D10 inches
Show answer & explanationAnswer & explanation
Correct answer: B. 12 inches
NEC 705.11(A) specifies that a PV supply-side connection must be made at the service equipment and must be located within 12 inches of the utility service conductors' termination point to ensure short, protected connections.
Why the other options are wrong
- A. 18 inches exceeds the maximum permissible distance specified by the NEC.
- C. 6 inches is too short and not the specified maximum distance.
- D. 10 inches is close but not the exact maximum distance specified by the NEC.
NEC PV Supply-Side Connection Distance
The maximum allowable physical distance from the utility service conductors' termination point at the service equipment where a PV system's supply-side connection can be made, as per NEC 705.11(A).
- Applies to supply-side PV interconnections.
- Ensures short, protected connections.
- Aids in emergency disconnect procedures.
Memory trick: Keep the solar connection close to the main power heart.