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Tool Talk Discussion Forum

OT underground electric wiring

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BobOHIO

10-30-2007 16:28:08




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Is it OK to run "indoor" wiring underground as long as it is sealed in the gray underground conduit? Also, where the conduit comed into the basement does it have to be connected to the panel, or can it stop at the wall and wire ran over to the panel. It will enter about 12" from the panel. Thanks




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BobOHIO

11-01-2007 04:54:01




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 Re: OT underground electric wiring in reply to BobOHIO, 10-30-2007 16:28:08  
Thanks everybody you saved me from making two mistakes. I asked the guy at Home Depot and he said it would be OK but I just didn't know. Figured I would ask on here to be safe and glad I did. Thanks again.



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msb

10-30-2007 20:32:36




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 Re: OT underground electric wiring in reply to BobOHIO, 10-30-2007 16:28:08  
Romex has a paper liner which wicks moisture into the insulation and any small bare spot will short out. Previous owner used it to wire the pool pump. I had to replace it this summer when it shorted out. UF is not that much more expensive, but is tougher to work with. DON"T !use it.



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Joe(TX)

10-31-2007 05:33:29




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 Re: OT underground electric wiring in reply to msb, 10-30-2007 20:32:36  
If it shorted out, it was not because of the paper, especially if it was in conduit. If it was direct buried, that was a code violation. If there were bare spots, the insulation was cut. That was the problem.
UF wire is rated for direct burial although not allowed by some codes..



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old art

10-30-2007 20:20:11




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 Re: OT underground electric wiring in reply to BobOHIO, 10-30-2007 16:28:08  
when you enter the building with conduit it is best to enter above grade so you dont get a water leak,i go up to the wood that puts you into the ceiling aera in the basement



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John T

10-30-2007 19:56:35




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 Re: OT underground electric wiring in reply to BobOHIO, 10-30-2007 16:28:08  
Heres yet one more NOPE. It dont matter if its in conduit or not, underground means underground. You can buy Underground Feeder (UF) cable which is suitable for direct burial for not much more then indoor cable but even in needs to be in conduit under driveways etc and you wanna use conduit as protection where it rises up out of the ground. Or else use the W rating as posted below if youre going with individual conductors in buried conduit.

John T

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Gerald J.

10-30-2007 18:09:58




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 Re: OT underground electric wiring in reply to BobOHIO, 10-30-2007 16:28:08  
Nope and nope. Needs to be rated for conduit us which NM isn't and needs to be in conduit the whole way into the panel.

Gerald J.



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suptscottyb

10-30-2007 17:17:55




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 Re: OT underground electric wiring in reply to BobOHIO, 10-30-2007 16:28:08  
Not sure what you mean but, I do know that most indoor wiring is romex ( vinyl or plastic sheathed) and is not intended to be put in conduit for the wet condition reason and because the added insulation may build up heat if not allowed to breath as in a conduit. As far as wire coming into the house - it can land in any sufficient j box before going to the panel if needed.



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Bus Driver

10-30-2007 16:46:50




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 Re: OT underground electric wiring in reply to BobOHIO, 10-30-2007 16:28:08  
Not sure what you mean about "indoor wiring". Underground conduit is considered to be a wet location due to condensation and potential water intrusion. NM cable used indoors is not rated for wet locations. Individual conductors for installation in conduit AND for wet locations will have a W in the identity marking, such as THW, THWN.



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weekend electrics

10-31-2007 11:01:05




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 Re: OT underground electric wiring in reply to Bus Driver, 10-30-2007 16:46:50  
not only can you NOT run indoor rated wire outside, but you can't run outdoor wire inside either

outdoor wire inside the house is a fire hazzard



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Bus Driver

10-31-2007 14:08:03




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 Re: OT underground electric wiring in reply to weekend electrics, 10-31-2007 11:01:05  
"Outdoor wire" is not a classification found in the NEC. Many individual conductors and cables are listed for use both interior and exterior. For example, read Article 340 of the NEC. Pay particular attention to 340.10 (4).



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John T

10-31-2007 15:04:34




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 Re: OT underground electric wiring in reply to Bus Driver, 10-31-2007 14:08:03  
Im pretty rusty on the NEC having retired as a design engineer over 15 yrs ago buttttt ttttt I totally agree with ya Bus Man. Conductors with insulations having say a THWN rating (the W) are rated for wet and damp locations and can be used Indoors or Outdoors. I have used UF Undergroud Feeder cable approved for direct burial outside, but inside, of course, use what used to be called Romex. Im unaware of any ban on UF inside unless its jacket would put off some sort of toxic fumes, I will have to look into that. In spaces used for air handler plenums like returns and air space above suspended ceilings etc there are specific bans on certain types of wiring and insulation classes as if theres a fire they may emit toxic gasses grrrrr rrrr

Take care

John T

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