Services, Grounding & BondingQuestion 34 of 120
Where the grounding electrode conductor connects only to a concrete-encased electrode, what is the largest size it is required to be?
a.2 AWG copper
b.6 AWG copper
c.4 AWG copper
d.1/0 AWG copper
Explanation
The conductor to a concrete-encased electrode is never required to be larger than 4 AWG copper. The 6 AWG cap belongs to rod, pipe and plate electrodes, and 2 AWG or 1/0 would only come from Table 250.66 before this limiting rule is applied.
Law Reference: 2023 NEC §250.66(B)Practice all 120 questions free — no signup required.
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