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.

Thank you for reporting this comment. Undo
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
Thank you for reporting this comment. Undo
footwedge

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

    Bookmark   June 16, 2012 at 11:17PM
Thank you for reporting this comment. Undo
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
Thank you for reporting this comment. Undo
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
Thank you for reporting this comment. Undo
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
Sign Up to comment
More Discussions
Too much load for circuit?
I have 200 amp service to the main panel (which has...
zver11
How to get garage freezer to work in cold weather
I have a 7-year-old GE refrigerator/freezer in my unheated,...
amyf5
Replacing fan speed dial back to standard toggle?
I am removing a ceiling fan and replacing it with a...
onkyokoi
Doorbell goes off by itself.
Can anyone tell me why this would happen? It's a wired...
stu2900
electrical outlet distance to radiator
how far from a radiator should a wall electrical outlet...
amsayan
© 2015 Houzz Inc. Houzz® The new way to design your home™