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Tool Talk Discussion Forum

NEC on furnace circuit drop

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jCarroll

07-11-2007 16:55:28

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I'm looking at a house which has a "new" furnace in an ordinary unfinished basement. The 120v power is by a NM cable dropped from the ceiling switch to the furnace cabinet, through a knockout to the interior junction box.

Seems like all the furnaces I've looked at have conduit from the ceiling to the furnace cabinet, or BX cable - instead of exposed NM cable.

Is this installation OK, or is this code deficient?

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LumbrJakman

07-12-2007 04:36:17

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Re: NEC on furnace circuit drop in reply to jCarroll, 07-11-2007 16:55:28

No way .... That wire needs to be supported at no less than 12 " from the junction box , and no less than 4-1/2' intervals in a run . Also the only way you can run it with no back boards is if the cable assembly has a minimum of 3- #8 AWG or 2- #6 AWG conductors in the assembly. The biggest violation is where a homeowner will run it across the joists in a basement with no back boards. The reason they specify the size of cable allowed to run freely across Joists , is because more than likely they will end up hanging stuff on the cable,the larger assembly should support any stuff hung on it. Clothes hangers , garden tools etc.

That installation done correctly should have a piece of pipe , (EMT) , from a junction box which houses a Fireomatic . Most tradesmen will ty-wrap the Thermostat wire to the pipe to bring to the Pony Relay. Thats not actually the proper way to do that, but its usually 24 Volts , so not a real bad violation .

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Charles (in GA)

07-11-2007 17:09:53

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Re: NEC on furnace circuit drop in reply to jCarroll, 07-11-2007 16:55:28

A NM cable in the open, unsupported except at the top and at the furnace, in thin air, not mounted on anything, nor stapled to anything, not even laying againist anything????? ????? ? I don't think so!!!!!

NEC 334.15 thru 334.30 are applicable to this situation and expecially 334.15(C) and 334.30(B)

You can view the code (but not copy, save or print) at the link below.

Link

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jCarroll

07-11-2007 19:57:10

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Re: NEC on furnace circuit drop in reply to Charles (in GA), 07-11-2007 17:09:53

Thanks, Charles.
Your NEC paragraph references were quite helpful.

jC in Ohio

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