ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Recent Posts
Anybody comment on materials pricing?
by gfretwell - 06/10/21 01:33 PM
2 pole GFI feeding 1 and 2 pole loads
by gfretwell - 06/04/21 02:27 AM
Lock-down Thread
by HotLine1 - 06/01/21 08:15 AM
Updated Forum Software
by Admin - 05/31/21 12:09 AM
Square D "All-In-One" Panelboard
by HotLine1 - 05/29/21 12:13 PM
New in the Gallery:
2020 - 2021 Winter Project
2020 - 2021 Winter Project
by Bill Addiss, April 29
Garden 2021
Garden 2021
by Bill Addiss, April 26
Who's Online Now
1 members (Scott35), 45 guests, and 15 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
#94070 07/05/05 11:33 PM
Joined: Mar 2005
Posts: 236
can you use nm 8-3 to feed a 50 amp hot tub?

2017 / 2014 NEC & Related Books and Study Guides
#94071 07/06/05 12:21 AM
Joined: Jul 2004
Posts: 9,643
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
Joined: Jan 2004
Posts: 1,507
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
Joined: Mar 2005
Posts: 236
it is an outdoor hot tub

#94074 07/06/05 04:44 PM
Joined: Jan 2002
Posts: 1,457
Are you asking if you can run NM outside to a hot tub?

#94075 07/06/05 05:59 PM
Joined: Jun 2004
Posts: 613
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...


#94076 07/06/05 06:25 PM
Joined: Feb 2005
Posts: 44
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
Joined: Jan 2003
Posts: 4,391
If NM is in fact appropriate 8 AWG NM can not be used above 40 amps.

Bob Badger
Construction & Maintenance Electrician
#94078 07/07/05 02:22 AM
Joined: Mar 2005
Posts: 236
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
Joined: Jul 2004
Posts: 9,643
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
Page 1 of 2 1 2

Link Copied to Clipboard

Tools for Electricians
Tools for Electricians

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Posts: 46
Joined: May 2007
Top Posters(30 Days)
Admin 11
Trumpy 10
Popular Topics(Views)
280,291 Are you busy
213,384 Re: Forum
200,328 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5