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#94070 - 07/05/05 11:33 PM 50 amp hot tub  
watersparkfalls  Offline
Member
Joined: Mar 2005
Posts: 216
Washington...Not DC
can you use nm 8-3 to feed a 50 amp hot tub?


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#94071 - 07/06/05 12:21 AM Re: 50 amp hot tub  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,077
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.


Greg Fretwell

#94072 - 07/06/05 07:16 AM Re: 50 amp hot tub  
George Little  Offline
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Joined: Jan 2004
Posts: 1,489
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.


George Little

#94073 - 07/06/05 09:30 AM Re: 50 amp hot tub  
watersparkfalls  Offline
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Joined: Mar 2005
Posts: 216
Washington...Not DC
it is an outdoor hot tub


#94074 - 07/06/05 04:44 PM Re: 50 amp hot tub  
Electricmanscott  Offline
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Joined: Jan 2002
Posts: 1,457
Holden, MA USA
Are you asking if you can run NM outside to a hot tub?


#94075 - 07/06/05 05:59 PM Re: 50 amp hot tub  
shortcircuit  Offline
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Joined: Jun 2004
Posts: 608
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


#94076 - 07/06/05 06:25 PM Re: 50 amp hot tub  
boggerbutt2454  Offline
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Joined: Feb 2005
Posts: 44
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.


#94077 - 07/06/05 06:38 PM Re: 50 amp hot tub  
iwire  Offline
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Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
If NM is in fact appropriate 8 AWG NM can not be used above 40 amps.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#94078 - 07/07/05 02:22 AM Re: 50 amp hot tub  
watersparkfalls  Offline
Member
Joined: Mar 2005
Posts: 216
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?


#94079 - 07/07/05 12:52 PM Re: 50 amp hot tub  
gfretwell  Offline


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Joined: Jul 2004
Posts: 9,077
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.


Greg Fretwell

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