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#94070 07/05/05 10:33 PM
Joined: Mar 2005
Posts: 240
Member
can you use nm 8-3 to feed a 50 amp hot tub?

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#94071 07/05/05 11:21 PM
Joined: Jul 2004
Posts: 9,677
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G
Member
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 06:16 AM
Joined: Jan 2004
Posts: 1,507
G
Member
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 08:30 AM
Joined: Mar 2005
Posts: 240
Member
it is an outdoor hot tub

#94074 07/06/05 03:44 PM
Joined: Jan 2002
Posts: 1,457
E
Member
Are you asking if you can run NM outside to a hot tub?

#94075 07/06/05 04:59 PM
Joined: Jun 2004
Posts: 613
S
Member
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 05:25 PM
Joined: Feb 2005
Posts: 44
B
Member
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 05:38 PM
Joined: Jan 2003
Posts: 4,391
I
Moderator
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 01:22 AM
Joined: Mar 2005
Posts: 240
Member
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 11:52 AM
Joined: Jul 2004
Posts: 9,677
Likes: 9
G
Member
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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