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.

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).”