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Joined: Mar 2005
Posts: 240
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can you use nm 8-3 to feed a 50 amp hot tub?
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Joined: Jul 2004
Posts: 9,931 Likes: 34
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I think not. NM is not one of the approved wiring methods in 680 part II. I also could have problems with the ampacity, based on the nameplate rating of the spa and mfg instructions. 8ga is only good for 40a in the 60c column.
Greg Fretwell
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Joined: Jan 2004
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Greg- The question is not stating whether it is an indoor or outdoor spa. 680.42 and 680.43 come into play here.
George Little
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Joined: Mar 2005
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Joined: Jan 2002
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Are you asking if you can run NM outside to a hot tub?
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Joined: Jun 2004
Posts: 613
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Romex (type NM) is allowed in the interior of a one family dwelling or the interior of a structure associated with a one family dwelling...
But read the instructions with the tub and labels at the control box behind the skirt of the tub. Some require a full size EGC to be run with the circuit conductors...
shortcircuit
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Joined: Feb 2005
Posts: 44
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Shorties right read your Manufacture's manual most spa manufacture's will put min. wire size and I've found more times tahn not it is a #6 copper, but check your manual. If customer doesn' know call dealer they bought it from.
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Joined: Jan 2003
Posts: 4,391
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If NM is in fact appropriate 8 AWG NM can not be used above 40 amps.
Bob Badger Construction & Maintenance Electrician Massachusetts
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Joined: Mar 2005
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no i am not asking if i can run the nm outside. just wondering if i can calculate hot tub as a motor to use smaller wire.
any thoughts against using 6-3 aluminum?
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Joined: Jul 2004
Posts: 9,931 Likes: 34
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A spa is a combination load with a significant part that is a "toaster wire" heater. The answer is in the manufacturer's instructions unless you want to start reading nameplate ratings and calculating. You are still stuck in the 60c column with Romex.
Greg Fretwell
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Posts: 806
Joined: October 2004
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