NM CID EL-1 Practice Questions - New Mexico CID EL-1 Electrical Distribution Systems, Including Transmission Lines Examination Exam

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A 200 A New Mexico service uses 3/0 AWG copper ungrounded conductors and a concrete-encased electrode. What is the smallest copper grounding electrode conductor New Mexico permits to that electrode?

8 AWG copper, because 250.66(A) caps a rod at 6 AWG and a CEE may be smaller 6 AWG copper, the rod-electrode cap in 250.66(A) 4 AWG copper, because NMAC 14.10.4 forbids a CEE tap smaller than 4 AWG 3/0 AWG copper, matching the ungrounded conductors

Correct Answer:

4 AWG copper, because NMAC 14.10.4 forbids a CEE tap smaller than 4 AWG

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