Another question about Romex in conduit

[Special K]

Does not 334.15 A thru C permit the use of nm cable. in this case

 

[haskindm]

Nothing in article 334 allows the installation of type NM, with or without the sheath in a wet location. According to the NEC this installation is a wet location.

 

[Special K]

314.15A Cable shall closely follow the surface of the building finish. 314.B cable shall be protected from physical damage etc.

 

[Special K]

According to article 344.10 I can use RMC under all atmospheric conditions and occupancies. So am I limited to what wire I can put inside the pipe?

 

[George Stolz]

The problem is, the wiring method is NM. The piece of tubing or conduit is a sleeve for physical (mechanical) protection, not the wiring method.

At any rate, we can physically protect it until we are blue in the face, but physical protection does not alliviate the prohibition from installing it in wet locations, and from the requirement to clamp it to any boxes it enters.

Edit to add:

So am I limited to what wire I can put inside the pipe?

Yes, see 310.11.

 

[Special K]

one more question: If this was a hazardous location? What wire would I be limited to use. The RMC is not only used for Mechanical protection but it also becomes waterproofing for the wire. The RMC installed inside of buildings in the floor has no particular wire installed in it yet water always migrates into the pipe eventually. I believe the intent of the code is that the wire can not be used as stand alone! And does anybody know what wire is actually inside nm cable?

 

[haskindm]

one more question: If this was a hazardous location? What wire would I be limited to use. The RMC is not only used for Mechanical protection but it also becomes waterproofing for the wire. The RMC installed inside of buildings in the floor has no particular wire installed in it yet water always migrates into the pipe eventually. I believe the intent of the code is that the wire can not be used as stand alone! And does anybody know what wire is actually inside nm cable?

Hazardous location would not effect the conductors, just the wiring method. Since the individual conductors in NM are not labeled, we do not know what they are. That is why you cannot strip NM and then install it in a conduit. They may be THHN or THWN, you don't know and the inspector cannot tell since you have removed the marking. 310.11 tells you the marking that must be on all "cables or conductors". If you remove the marking, you have rendered the wires unusable.