National Electrical Installation Standards

Standards as High as Your Own

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Wednesday, December 21, 2016

Question:

I look forward to reading CQD every morning, Please help me with GEC vs EGC and what 250. tables to use when. Thanks in advance David

David Cotter

A

Answer:

Hey David thanks for your question.

Grounding electrode conductors (GEC) are sized based on Table 250.66 unless one of the provisions in 250.66 (A), (B), or (C) allows a smaller size.

Equipment grounding conductors (EGC) are sized based on Table 250.122 unless one of the provisions in 250.122 (A) through (F) apply.

Table 250.102(C)(1) is new for the 2014 NEC and is used to size main bonding jumpers, system bonding jumpers, supply side bonding jumpers and also grounded conductors that are intended to carry fault current.

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