NRTL & NEC Listing Requirements

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TPWCO

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We are working on a project that involves remote electronic metering of various panelboards & switchboards, etc.

The components (meter, CT's, PT's, fuse block, shorting terminal block, etc.) are all UL listed & approved by the AHJ, including the NEMA 3R 18" x 24" hinge cover enclosure the components are to be installed in.

The components are being installed per the client's standard, pertaining to wire size, mounting methods, clearances, etc. & being done so per code. Is there anything in the code, or a UL requirement that these components assembled in the field need to be NRTL (nationally recognized testing lab) as an "assembly" & have a separate NRTL label attached?

Where is the cut-off point when NRTL labeling is concerned?

Example 1: take a 4 sq. j-box & connect a 1/2" conduit, install 2#12 wires with a wire nut, is this now considered an "assembly" & requires a NRTL label, even though each component is NRTL & installed per their manufacturer's requirements?

Example 2: install a Watt Stopper power pack in the same j-box... you just changed the previous "assembly"... does that mean that a new NRTL label is now required?

Example 3: take a NEMA 3R 12" x 12" pull can & install a lighting contactor & wires, etc., a common installation done all across the country... is this considered an "assembly" & therefore would require a separate NRTL label?

I know that NEC Article 110.2 & definitions for "Approved", "Labeled" & "Listed" clearly state that the AHJ has the say over what does & does not require a NRTL label, but the AHJ in this case does not clearly identify that an "assembly" of listed components is required to have a separate NRTL label... neither does NEC, nor OSHA.

Obviously, it would open a huge can of worms if every "assembly" of NRTL components would require separate testing/listing, when there are literally millions of installations across the nation where this would be required.

If someone could shed light on this, I'd appreciate it.

Thanks!
 
To use your example, locally if a contractor purchase a 3R cabinet and a contractor, installed and wired them, there would seldom be a question.
He, as a licensed contractor, completed all the wiring.
If, on the other hand, he purchased a pre-wired assembly where he simply terminated on a terminal block, that assembly would need to be NRTL.
(In actual practice, most of the local inspectors, if it was evident that the "assembly" was to NEC would accept it)
Again, locally the NRTL requirement normally becomes an issue on "assemblies" wired to some specifications other than the NEC, or it is an "assembly" of components where their can be some question as to their
compatibility (involving such issues as withstand ratings, etc)

The info I am providing is based on local practices.
 
NRTL listing requirements

NRTL listing requirements

Thanks augie47...

Your point is well taken, however, each of your references to "assembly" or "assemblies" is the part that is in question here.

Can anyone direct me to either a NEC, UL, or an OSHA document that clearly defines an "assembly" & that as an assembly, a label is therefore required?

Again, in this installation, all components are NRTL & all are installed according to NEC & the clients' installation standards, including mounting methods & required clearances.

I've searched all through UL & OSHA web pages & find numerous references to enclosures, components, devices, etc., but not one reference of these items requiring a NRTL label once installed together as an assembled group of components, assembled in the field.

If anyone can shed light on this, that would be great.
 
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