Equipment grounding conductors for PV source and PV output circuits shall be sized in accordance with NEC ___.

Equipment grounding conductors for PV source and PV output circuits shall be sized in accordance with NEC ___.

• A. 250.122
• B. 250.4
• C. 250.66
• D. 250.102

Answer: (A)

Sizing the equipment grounding conductor for PV source and PV output circuits follows the same rule as other circuits: the conductor size is determined by the overcurrent protection device that protects that particular circuit, using Table 250.122 in the NEC. This ensures the grounding path is large enough to safely carry any fault current back to the source long enough for the protective device to trip, preventing an unsafe voltage on equipment or a shock hazard. In PV systems, this applies to both the PV source circuit and the PV output circuit. The specific EGC size is chosen based on the OCPD protecting each circuit, not just the general circuit type. For example, if a PV circuit is protected by a 20-amp device, the required copper EGC would be at least the size shown for 20 A in Table 250.122, typically #12 copper. Larger OCPDs call for larger EGCs accordingly. The other code references listed address different grounding and bonding provisions or use different criteria, so they don’t specify the sizing rule for EGCs based on the protecting OCPD in this context. Thus, the correct NEC reference for sizing is 250.122.

Sizing the equipment grounding conductor for PV source and PV output circuits follows the same rule as other circuits: the conductor size is determined by the overcurrent protection device that protects that particular circuit, using Table 250.122 in the NEC. This ensures the grounding path is large enough to safely carry any fault current back to the source long enough for the protective device to trip, preventing an unsafe voltage on equipment or a shock hazard.

In PV systems, this applies to both the PV source circuit and the PV output circuit. The specific EGC size is chosen based on the OCPD protecting each circuit, not just the general circuit type. For example, if a PV circuit is protected by a 20-amp device, the required copper EGC would be at least the size shown for 20 A in Table 250.122, typically #12 copper. Larger OCPDs call for larger EGCs accordingly.

The other code references listed address different grounding and bonding provisions or use different criteria, so they don’t specify the sizing rule for EGCs based on the protecting OCPD in this context. Thus, the correct NEC reference for sizing is 250.122.