Where ungrounded conductors are increased in size for any reason other than as required in 310.15(B) or 310.15(C), wire-type equipment grounding conductors (where installed) shall be increased in size ____, according to the circular mil area of the ungrounded conductors.

Question

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When ungrounded conductors are increased in size for any reason other than as required in 310.15(B) or 310.15(C), wire-type equipment grounding conductors (where installed) shall be increased in size proportionately, according to the circular mil area of the ungrounded conductors. This means that the size of the grounding conductor should be increased in direct proportion to the increase in the size of the ungrounded conductor.

Where Ungrounded Conductors Are Increased in Size for Any Reason