Wire in metal conduit?

footwedgeJune 16, 2012

What does the code say about the insulation requirements for the hot, neutral and ground in a metal conduit? I would like to know if I can strip the outer jacket of a romex cable and put these conductors in the conduit.

I think this is ok but not sure about the ground. I'm aware of the fill requirement.

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circuitbreaker

If you use a metal conduit you have to use individual conductors (THHN/THWN) as the Romex wires are not rated to be used outside the sheath like that

    Bookmark   June 16, 2012 at 9:14PM
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footwedge

Thanks. Can I use romex if I leave in the sheath?

    Bookmark   June 16, 2012 at 11:17PM
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circuitbreaker

Yes you can but it will harder to pull through the conduit and you may have to use a larger conduit or derate the conductors

    Bookmark   June 17, 2012 at 4:15AM
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mike_kaiser_gw

With some exceptions, the metal conduit serves a the equipment ground so there is no need for a ground wire. In that scenario you need to use self grounding devices in firm contact with the metal junction box or use a short pigtail from the device to the box.

Of course, if you are a belt and suspenders kind of guy, you can run a separate ground wire and treat it like you would with non-metallic cable.

    Bookmark   June 17, 2012 at 10:31AM
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brickeyee

"strip the outer jacket of a romex cable and put these conductors in the conduit. "

The individual wires in NM are not marked as to type, so they may not be used for other purposes.

    Bookmark   June 17, 2012 at 5:05PM
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