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Is it ok to run electrical wires in schedule M copper tubing? I have recently installed electric cove heaters in my house and I do not want to run the wires through the wall. I am thinking about using copper tubing to hide the wires in a sort of "industrial" decorative way.

Thank you

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  • I don't know what the NEC has to say about this but just on first principles it seems that copper would be exactly what you would choose to maximize the dangerous effects of inductive heating via accidental eddy currents. – A. I. Breveleri Apr 8 '20 at 16:33
  • @A.I.Breveleri -- actually, steel is far worse than either Cu or Al re: eddy current losses. (It's why ferrous pans work a treat on induction, where copper or aluminum pans just don't work at all in that scenario). – ThreePhaseEel Apr 8 '20 at 23:47
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    If you really want the copper color, you could get red brass RMC, but oh boy, that's going to be expensive.... – ThreePhaseEel Apr 8 '20 at 23:47
  • @threephase I did not know that was a thing. Does anyone stock it? – Harper - Reinstate Monica Apr 9 '20 at 23:30
  • @Harper-ReinstateMonica -- it was used in some pool systems where GRC and EMT didn't provide enough corrosion resistance, and perhaps in other corrosive environments as well (before PVC-coated GRC was a thing). I suspect it's special-order-only nowadays though – ThreePhaseEel Apr 10 '20 at 1:51
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No, that's not a listed wiring method. Also, the wires would never make it around the corners.

But why not just use EMT, then? It has the same industrial look, and it's easy to work with once you get the hang of it. Paint it copper if you really want to.

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