How should equipment grounding conductors for photovoltaic (PV) system circuits be sized?

The appropriate approach to sizing equipment grounding conductors for photovoltaic (PV) system circuits is specified in NEC 250.122. This provision outlines the criteria for determining the minimum size of equipment grounding conductors based on the rating of the overload protective device. It ensures that the grounding conductors are adequately sized to facilitate the effective clearing of ground faults, enhancing safety and functionality in the system.

By following the guidelines in 250.122, the grounding conductor can properly handle fault currents without compromising the integrity of the PV system or the safety of individuals. This standardization takes into account various system configurations and helps to ensure a consistent application across different installations, thus reducing risks associated with improper grounding.

While other options may mention generic circuit loads or manufacturer specifications, these do not provide the authoritative and standardized approach that NEC guidelines and specifically Article 250.122 do, making it essential for compliance and safety in PV installations.