EGC Size Correction Calculator

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NEC Section 250.122 (B) states:
“If ungrounded conductors are increased in size for any reason other than as required in 310.15(C), wire-type equipment grounding conductors, if installed, shall be increased in size proportionately to the increase in circular mil area of the ungrounded conductors.

Exception:
Equipment grounding conductors shall be permitted to be sized by a qualified person to provide an effective ground fault current path in accordance with 250.4(A)(5) or (B)(4).”