What size must the DC system grounding electrode conductor be at a minimum for photovoltaic systems?

The minimum size for the DC system grounding electrode conductor in photovoltaic systems is specified to ensure both safety and effectiveness in grounding. In this context, the correct answer indicates that an 8 AWG conductor is the minimum acceptable size.

The reasoning behind this requirement is rooted in electrical safety standards, which are designed to handle potential fault currents and provide a reliable path for electrical discharges. An 8 AWG conductor has sufficient conductivity and durability to connect the photovoltaic system to its grounding electrode, helping to prevent electrical shock hazards and potential damage to the system.

Larger conductors lower on the gauge scale (like 6 AWG or 4 AWG) would also be acceptable but are not necessary for the minimum requirement, while smaller gauges like 10 AWG do not meet the necessary safety specifications for effective grounding in photovoltaic applications. Therefore, 8 AWG is the established minimum size that balances adequate electrical conductivity with safety considerations for grounding in these systems.