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

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Transformer secondary conductors are not considered protected by the primary overcurrent device unless they comply with NEC 240.21(C). For the 10-foot secondary conductor rule in 240.21(C)(2), which condition must the inspector verify?

The secondary conductors have an ampacity not less than the secondary current rating of the transformer, and the length is not more than 10 feet, with termination in a single overcurrent device Any secondary conductors 25 feet or less are automatically protected by a 125 percent primary breaker Secondary conductors never require overcurrent protection if the transformer is listed The secondary conductors need only be 14 AWG copper

Correct Answer:

The secondary conductors have an ampacity not less than the secondary current rating of the transformer, and the length is not more than 10 feet, with termination in a single overcurrent device

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