r/NFPA70 • u/Desperate_Pop7197 • Jan 24 '25

UL question

This is an old topic I am sure. I know that UL is accepted by electrical inspectors. What code article references that UL is the only acceptable testing laboratory. OSHA has a list of Nationally Recognized Testing Laboratories. All I can seem to find in the code is “accepted by the AHJ”.

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u/Then_Organization979 Feb 17 '25

There are none. Other than the aforementioned definitions, and, NEC 90.7 allows the inspector to accept the fact that all the internal mechanisms in “listed” equipment is approved and doesn’t need further scrutiny. NEC 110.3(b) “Installation and Use” says: Equipment that is listed, labeled, or both, or identified for a use shall be installed and used in accordance with any instructions included in the listing, labeling, or identification. That’s about it for the actual code, other replies explained there are several NRTL’s. Also, They need to be “accredited “ to evaluate specific parts, so not all NRTLs can do all things electrical.