NM Residential Electrical Inspector Practice Questions - New Mexico CID Residential Electrical Inspector Examination Exam

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Per NEC 2020 250.53(A)(2), a single rod, pipe, or plate electrode shall be supplemented by an additional electrode unless which condition is met?

The utility provides a grounded service conductor The service is 100 amperes or less A single electrode has a resistance to earth of 25 ohms or less The building is wood-frame

Correct Answer:

A single electrode has a resistance to earth of 25 ohms or less

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