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#94070 - 07/05/05 08:33 PM 50 amp hot tub
watersparkfalls Offline
Member

Registered: 03/08/05
Posts: 210
Loc: Washington...Not DC
can you use nm 8-3 to feed a 50 amp hot tub?

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#94071 - 07/05/05 09:21 PM Re: 50 amp hot tub
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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.
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Greg Fretwell

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#94072 - 07/06/05 04:16 AM Re: 50 amp hot tub
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Greg- The question is not stating whether it is an indoor or outdoor spa. 680.42 and 680.43 come into play here.
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George Little

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#94073 - 07/06/05 06:30 AM Re: 50 amp hot tub
watersparkfalls Offline
Member

Registered: 03/08/05
Posts: 210
Loc: Washington...Not DC
it is an outdoor hot tub

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#94074 - 07/06/05 01:44 PM Re: 50 amp hot tub
Electricmanscott Offline
Member

Registered: 01/12/02
Posts: 1478
Loc: Holden, MA USA
Are you asking if you can run NM outside to a hot tub?

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#94075 - 07/06/05 02:59 PM Re: 50 amp hot tub
shortcircuit Offline
Member

Registered: 06/27/04
Posts: 608
Loc: massachusetts
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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#94076 - 07/06/05 03:25 PM Re: 50 amp hot tub
boggerbutt2454 Offline
Member

Registered: 02/27/05
Posts: 44
Loc: Concord NC USA
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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#94077 - 07/06/05 03:38 PM Re: 50 amp hot tub
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
If NM is in fact appropriate 8 AWG NM can not be used above 40 amps.
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Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#94078 - 07/06/05 11:22 PM Re: 50 amp hot tub
watersparkfalls Offline
Member

Registered: 03/08/05
Posts: 210
Loc: Washington...Not DC
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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#94079 - 07/07/05 09:52 AM Re: 50 amp hot tub
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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.
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Greg Fretwell

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