plumbing nipples used with rigid conduit.

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reyamkram

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Location
Hanover park, il
Where I work I keep commig across place where there is a mixture of rigde conduit with a plumbing nipples,
and some are in a hazrdous location, where in NFPA 70 or 79, can I find this is violation or unsafe practices.
I do not is see any wiring methods in ch 3 , wher it is ok.

Thank you. for any and all information.
 
It's pretty common but not to code. If you look in the section for rigid conduit I'm pretty sure you will find a place where it says the conduit and all the fittings have to be UL listed. I seriously doubt the plumbing nipples are listed to be used in a rigid conduit system.
 
Observed some recently installed at a paint booth facility. Contractor stated they go all over country installing them this way.(n)
 
I've done a side by side of both types rigid and plumbing, because was curious of what's the diff and needed fitting not available in rigid. My unscientific finding was the galvanizing seemed to be of a different grade, and of particular note was how the interior of pipe galvanizing was "lumpier" on the plumbing fitting than the ul listed. It was so much so on some pieces that actual sharp edges were internally present on the plumbing fitting. That could be an issue when pulling wire through it. Not sure of any other differences.
 
I was under the impression that the materials are pretty similar but the electrical nipples are reamed better because they will have conductors puled through them. The threads are the same and they seem to have the same wall thickness.
 
The internal weld bead on the seam of plumbing nipples often protrudes out significantly and has rough and sometimes even sharp edges.
ANSI and UL specs on RMC would prohibit this.
 
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