Services & DistributionQuestion 70 of 521
A feeder is protected by a 100 A overcurrent device. Using Table 250.122, the minimum size copper equipment grounding conductor is:
a.12 AWG
b.10 AWG
c.8 AWG
d.6 AWG
Explanation
Table 250.122 lists an 8 AWG copper equipment grounding conductor for circuits protected at 100 A. A 10 AWG is the value for 60 A, and 6 AWG is for larger ratings up to 200 A, so both miss the 100 A row.
Law Reference: 2023 NEC §250.122Practice all 521 questions free — no signup required.
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