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Thread: Copper Tubing used as conduit?

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    Copper Tubing used as conduit?

    I found an electrical panel that has a copper tube apparently being used as an electrical conduit. Is this legal?
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    I'd say no since it's not a listed raceway.

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    Quote Originally Posted by 480sparky View Post
    I'd say no since it's not a listed raceway.
    I agree. I guess in theory you can use it as a stub or chase, however that's not the application here.

    at first I thought it was Mi cable until I looked in the panel. No idea why anyone would have used copper, it's considerably more expensive than an equal size of EMT.
    Electricians do it until it Hertz!

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    Quote Originally Posted by NewtonLaw View Post
    I found an electrical panel that has a copper tube apparently being used as an electrical conduit. Is this legal?
    This may be a silly question, but that isn't 3-conductor MI by any chance, is it?

    ETA:
    OK, missed the second part of JFletcher's post, but why are you sure it isn't MI?

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    MI doesn't have insulated conductors, as far as I have ever seen.
    The more they overthink the plumbing, the easier it is to stop up the drain

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    Quote Originally Posted by dkidd View Post
    MI doesn't have insulated conductors, as far as I have ever seen.
    I have never seen MI in the wild but if the conductors are uninsulated how do they prevent shorting to the metal conduit?

    ETA: So I went and looked it up and answered my own question. The insulation is stuffed around the bare conductors inside the sheath.
    Bob

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    Quote Originally Posted by petersonra View Post
    I have never seen MI in the wild but if the conductors are uninsulated how do they prevent shorting to the metal conduit?
    The name says mineral insulated. I would presume there is insulation it just isn't thermoplastic insulation.
    I live for today, I'm just a day behind.

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    maybe it is actually brass. they do make brass conduit and fittings.
    Bob

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    Quote Originally Posted by petersonra View Post
    maybe it is actually brass. they do make brass conduit and fittings.
    OK, but that means someone has way more money than they need.

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    Quote Originally Posted by petersonra View Post
    maybe it is actually brass. they do make brass conduit and fittings.
    Yes, possible, and it would have been interesting to see a fitting, or maybe the fitting where it enters the panel. But I'm guessing someone just used copper tubing - maybe because they could bend it easily? Hard to be sure from the picture.

    I would question the fill also - looks like the wire is packed in there. I'm surprised they managed to pull the wire in that unless its really short. That kind of makes me wonder if its MI or something like that where the conductors were already part of the assembly.

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