NM Electrical Inspector (General) Practice Questions - New Mexico CID Electrical Inspector (General) Examination Exam

When must a neutral conductor be counted as a current-carrying conductor for ampacity adjustment under NEC 310.15(E)?

Never, because neutrals only carry imbalance When it carries only the unbalanced current from other conductors of the same circuit, it is not counted; it is counted when it carries a portion of the nonlinear load current, as in a 3-phase, 4-wire, wye-connected system with nonlinear loads Always, in every multiwire branch circuit Only if it is larger than the ungrounded conductors

Correct Answer:

When it carries only the unbalanced current from other conductors of the same circuit, it is not counted; it is counted when it carries a portion of the nonlinear load current, as in a 3-phase, 4-wire, wye-connected system with nonlinear loads

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