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50 amp hot tub

Posted By: watersparkfalls

50 amp hot tub - 07/06/05 03:33 AM

can you use nm 8-3 to feed a 50 amp hot tub?
Posted By: gfretwell

Re: 50 amp hot tub - 07/06/05 04:21 AM

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.
Posted By: George Little

Re: 50 amp hot tub - 07/06/05 11:16 AM

Greg- The question is not stating whether it is an indoor or outdoor spa. 680.42 and 680.43 come into play here.
Posted By: watersparkfalls

Re: 50 amp hot tub - 07/06/05 01:30 PM

it is an outdoor hot tub
Posted By: Electricmanscott

Re: 50 amp hot tub - 07/06/05 08:44 PM

Are you asking if you can run NM outside to a hot tub?
Posted By: shortcircuit

Re: 50 amp hot tub - 07/06/05 09:59 PM

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
Posted By: boggerbutt2454

Re: 50 amp hot tub - 07/06/05 10:25 PM

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.
Posted By: iwire

Re: 50 amp hot tub - 07/06/05 10:38 PM

If NM is in fact appropriate 8 AWG NM can not be used above 40 amps.
Posted By: watersparkfalls

Re: 50 amp hot tub - 07/07/05 06:22 AM

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?
Posted By: gfretwell

Re: 50 amp hot tub - 07/07/05 04:52 PM

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.
Posted By: watersparkfalls

Re: 50 amp hot tub - 07/12/05 05:12 PM

any disadvantage to using alum. vs copper?
Posted By: Speedy Petey

Re: 50 amp hot tub - 07/12/05 10:41 PM

Yes, pretty much every spa I have ever wired has specifically stated to use copper conductors.
Posted By: Speedy Petey

Re: 50 amp hot tub - 07/12/05 10:49 PM

Also, the ground is required by code to be copper, so why would you even consider AL for the other conductors?
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