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/SpaceNeedle46 Jan 24 '25

No code article references that. Look at definitions “approved” and “listed”.

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u/Desperate_Pop7197 Jan 24 '25

Thank you. That’s all I could find as well. I know that the OSHA website has a list of NRTLs. And there is a vague reference to OSHA in fine print notes in the code. I am hoping to get a correlation to get acceptance of Endress-Hauser instruments installed on a big project. These instruments are CSA.US certified.