LFMC & LFNC Fittings / Listed

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DaveEDesign

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I know some one who uses LFNC conduit (because it is easier to cut & handle), but uses this conduit with LFMC fittings (due to sturiness), is this combination not legal as these parts aren't "listed" for use together?
 
Oops, not "legal"

Oops, not "legal"

I didn't mean to use the word "legal" as I'm not trying to get a ruling on the question, but really want to understand the meaning of "listed" in the use in the NEC.
 
IMO the fitting needs to be listed for use with the specific product. Using a LFMC connector on non-metallic conduit because is sturdier is not really an option if the two products aren't listed for sue with each other.
 
Conduit and Cable Fittings all are listed with specific cable and conduit types. The use you describe will void the listing on the fitting and conduit. You will also be in violation of the NEC as Listed fittings are required for use with those conduits.
 
Listed smisted, how about grounding of exposed metal fittings. I have seen people use LFNM with LFMC connectors from a plastic ac disco box over to an ac compressor. The connector at the ac would be bonded, but not the other end of the non mettalic flex conduit. Thats no good. Code.
 
I think there is at least one brand of connectors that are listed for both LFMC and LFNC, but am not 100% sure. I seen to recall reading an ad for them.
 
If you use a LFMC fitting on LFNC and the fitting becomes energized, you would not have a ground fault path to trip the breaker. The fitting would stay energized.
 
macmikeman said:
Listed smisted, how about grounding of exposed metal fittings. I have seen people use LFNM with LFMC connectors from a plastic ac disco box over to an ac compressor. The connector at the ac would be bonded, but not the other end of the non mettalic flex conduit. Thats no good. Code.
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That's no good, because the LFMC fittings are not listed for use with LFNM. Grounding/Bonding of the exposed fitting is not really the issue. Its the bonding of the equipment on each end of that conduit to each other that is the issue.

People that don't like to read box labels will not go and look up the listing. Code requires listed fittings to be used with these conduits.
 
Wes Smith said:
If you use a LFMC fitting on LFNC and the fitting becomes energized, you would not have a ground fault path to trip the breaker. The fitting would stay energized.
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So would the metallic enclosure it was mounted onto. If you use LFNM, you are required to use a separate bonding conductor inside the conduit and connect it to both pieces of equipment (i.e. disco and AC compressor housing). If you don't have that, well everything on one side of the connection could be energized due to a fault (i.e. AC unit).
 
LFMC & LFNC Fittings

LFMC & LFNC Fittings

Actually don resqcapt19 there is at least one, made by EGS/NEER and I've been told that Rayco does also. Of course a ground wire would have to be installed in this system.
 
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