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Thread: code compliant or not - "romex" in conduit

  1. #1
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    Question code compliant or not - "romex" in conduit

    Is it permissible to use NMC/Romex in conduit, like for an a/c whip?

    I was told no by our senior sparky and an inspector years ago, but have since heard it is okay per NEC. I did some reading in the section someone quoted, but I a not sure that applies: NEC code 334.15 .

    Thanks

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  2. #2
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    I don't think so only in underground conduit.

  3. #3
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    I see it done almost universally, could just strip off sheathing if concerned about it.

    last inspection inspt commented can't bundle a bunch of wires through a 1 1/2" romex clamp in panel now.
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  4. #4
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    not approved for damp locations . even though the cable contains thhn wire it is not marked

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    Quote Originally Posted by Galt View Post
    not approved for damp locations . even though the cable contains thhn wire it is not marked
    You're referring to with the jacket removed correct ?

  7. #6
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    No can do. I will sleeve it in a couple feet to a disconnect but even that is not code compliant

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  8. #7
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    In a pinch .... Strip off the yellow ... or orange sheathing , and the paper ofcourse , so you only have the wires , and I doubt anyone would notice the difference

  9. #8
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    A few years ago a State Fire Marshall said it was not approved. He said something about the jacket on the romex acting like insulation if the wires got warm when inside conduit.

  10. #9
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    what does he say about wires in an insulated wall cavity? or under 16" insulation in attic? or buried in sparyed foam in wall?

    in attic or close to roof on top, you actually have to derate wire in some cases, or if more than one circuit run in a conduit. inspect was being a butt in one area so checked all that stuff on a job cust later backed out on.
    Col 3:23


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  11. #10
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    I vaguely remember something about the insulation on stranded single conductor wire has a different type of insulation than the single core wire in 'romex'... something about the insulation on the single conductors in romex is more vulnerable to snagging and shorting.

    You electrical guys... is that part of the code or no????
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  12. #11
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    Quote Originally Posted by pacnw View Post
    Is it permissible to use NMC/Romex in conduit, like for an a/c whip?

    I was told no by our senior sparky and an inspector years ago, but have since heard it is okay per NEC. I did some reading in the section someone quoted, but I a not sure that applies: NEC code 334.15 .

    Thanks

    NO, it specifically stats in the code you cannot use NM cable in wet locations and yes inside the conduit is considered a wet locations if used outdoor.

  13. #12
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    Quote Originally Posted by VTP99 View Post
    NO, it specifically stats in the code you cannot use NM cable in wet locations and yes inside the conduit is considered a wet locations if used outdoor.
    Yup, not allowed outdoors for the reasons you say 300.9, 310.10, but along with that,NM is only rated for
    60degC, 140degF a conduit in the sun could get hotter than that and the allowable ampacity can't exceed that
    of a 60degC wire. Got to use a wire with a "W" in it's ID.
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