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NEC 250.122(B)

Question asked by dmatern on Nov 15, 2019
Latest reply on Nov 16, 2019 by chiefns830

In regards to NEC 2014 250.122(B). Assume calculations show that a  370 wire sizing ampacity is required for a feeder, and #500 KCMI copper conductor is selected to feed this load from a 400 amp circuit breaker prior to upsizing for any reason with a #3 copper equipment grounding conductor (EGC). If, due to voltage drop, this feeder is changed to (2) parallel #250 KCMIL copper, to what size is the EGC to be increased to in this situation (as ratio of conductor sizes equals 1).

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