• Code Quiz

    Q. When sizing an equipment grounding conductor for a solar photovoltaic system, which also has ground-fault protection for equipment, what is the minimum size equipment grounding conductor required for a circuit that is protected by a circuit breaker ...
    Jan. 12, 2007

    Q. When sizing an equipment grounding conductor for a solar photovoltaic system, which also has ground-fault protection for equipment, what is the minimum size equipment grounding conductor required for a circuit that is protected by a circuit breaker rated at 30A?
    A) The ground-fault protection equipment is all that is required. An equipment grounding conductor is not required.
    B) The minimum size of the equipment grounding conductor shall be based on 125% of the photovoltaic-originated short-circuit currents in that circuit.
    C) A 10 AWG conductor, as noted in Table 250.122.
    D) An 8 AWG conductor, as noted in Table 250.66.

    Answer: C
    Because ground-fault protection of equipment is provided, you must size the equipment grounding conductor based on Table 250.122. As noted in Table 250.122, a 10 AWG conductor is required for a circuit protected by a 30A overcurrent device.

    Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].

    About the Author

    Steven Owen

    Sign up for EC&M Newsletters
    Get the latest news and updates.

    Voice Your Opinion!

    To join the conversation, and become an exclusive member of EC&M, create an account today!