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Friday, July 16, 2021

Question:

Good Morning Code Friends!

We are having a debate in the office. Hopefully you can help with a neutral voice. Where in the NEC does is require everything to be listed by an NRTL?

Paul Hart

A

Answer:

Hi Paul,

Thanks for the question. The short answer is that the NEC does not require everything to be listed. Section 110.2 indicates that conductors and equipment covered by the NEC are acceptable only if approved. The term approved is defined in Article 100 as acceptable to the authority having jurisdiction. That said, most authorities having jurisdiction base their approvals on the use of listed electrical equipment. Section 90.7 provides information about qualified electrical testing laboratories that certify (list) electrical equipment. Note that some rules in the NEC specifically call out for equipment to be listed, such as Section 334.6 which requires Type NM and Type NMC cables and associated fittings to be listed. If you look at Article 376 covering Metal Wireways, there is not a requirement that wireways be listed. Note that the wireways do have to meet the construction specifications provided in Part III of Article 376.

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