ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Recent Posts
How's Florida doing with Hurricane Ian?
by Bill Addiss - 09/28/22 12:41 PM
Tough being a lineman's kid
by Bill Addiss - 09/28/22 12:39 PM
GFCI's pops in large numbers
by dsk - 09/26/22 04:35 AM
AFCI’s Revisited
by sparky - 09/24/22 09:58 AM
NFPA Price Increase Coming
by Bill Addiss - 09/23/22 02:22 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 37 guests, and 12 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 4 1 2 3 4
#101133 02/12/07 09:26 AM
Joined: Jan 2004
Posts: 1,507
What would you say to a contractor about his hook up on a furnace when he used a cord and cap connection instead of a direct hard wire connection?
Cord and cap connection is suitable if the horsepower rating is proper and the gauge of wire in the cord is adaquate.
The only thing I was concerned with is the manufacturer's installation instructions.
I have seen "wall heater" type installations that came out with a cord installed but I have never seen anyone connect a furnace using a cord and cap connection.

George Little
Stay up to Code with the Latest NEC:

2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep

#101134 02/12/07 10:03 AM
Joined: Nov 2000
Posts: 2,148
I think that you have a 400.8 violation.

#101135 02/12/07 02:11 PM
Joined: Jan 2005
Posts: 5,349
Likes: 1
Cat Servant
I think you have a typical "west coast" furnace installation. This is especially common where the electric is only needed for the igniter and the blower.

#101136 02/12/07 03:29 PM
Joined: Feb 2004
Posts: 75
Out here in California you would be hard pressed to find a furnace that wasn't installed like that. Usually the only time the furnaces are hardwired is in commercial applications.

#101137 02/12/07 04:33 PM
Joined: Jan 2003
Posts: 4,391
What about 422.16?

The furnace would have to be intended or identified for cord connection.

I also have a hard time believing a furnace needs 'frequent interchange.

The fact that California allows it does not mean it is indeed NEC compliant.

There are things we do here in MA that would not fly in other states.

Bob Badger
Construction & Maintenance Electrician
#101138 02/12/07 11:49 PM
Joined: Jan 2004
Posts: 1,507
Don- I agree with you on the 400.8 violation. I think unless there is some reason to connect it with a cord/cap they would specify same in the manufacturers installation guide.

And Bob- I would not think that a furnace as installed with duct work and piped in gas line qualifies for 422.16

So with you two guys backing me up- I'm Golden

George Little
#101139 02/13/07 12:15 AM
Joined: Mar 2004
Posts: 794
Here in Arizona virtually all the gas furnaces are plug and cord also. The only requirement is the receptacle must be the fused type, with an Edison fuse sized to Article 430.

Our evaporative (Swamp) coolers are also plug and cord connected, right up there on the roof, using a Midwest fused box sort of like a giant bubble cover where the cords hang out the bottom, one for the motor and one for the pump.

And yes, some of our homes are made out of mud.

#101140 02/13/07 01:01 AM
Joined: Oct 2006
Posts: 745
I know that this is kind of a stupid question, but would an electric furnace in a heat pump situation installed out west be wired with a cord and cap as well? An example would be a 50 amp range cord used for a few backup heat strip units for the inside air handler. Around here in the eastern U.S., all furnaces, regardless of fuel, are hard-wired.


"But the guy at Home Depot said it would work."
#101141 02/13/07 10:42 AM
Joined: Jan 2005
Posts: 5,349
Likes: 1
Cat Servant
No, such a heat pump would not be wired using a cord and cap.

The justifications for using cords here are a) the need to service the equipment;
b) the desire to have a receptacle available to the serviceman; and,
c) 430.109(F) recognizes that motors might be cord and plug connected, without making any restrictions as to the conditions under which this may be done.

That last reference, to 430.109(F), is not as clear as it once was. Prior editions to the code clearly stated that such "shall be permitted." The closing reference to portable motors "under 1/3 hp" not needing a horsepower rated rated plug has been the basis for limiting application of the cord & plug as a disconnecting means has been used to justify limiting this method to small motors in practice.

So, out West, one will often find fixed appliances hooked up using cord & plug, especially when the appliance can be served by an 'ordinary' 120v/15a receptacle. We will use pigtails on dishwashers, disposals, trash compactors, air cleaners, air conditioning condensers, circulation pumps, and all manner of things that "back East" might be hard-wired.

Taking the word-wrangling out of the discussion, I like the cord connection mainly because it provides a simple and sure means of disconnecting what you're working on. No more hunting for breakers! It also recognizes that the 'other trade' is not likely to be there at the same time as I; I can provide the receptacle, and he can put in his stuff.

That said, even I have some issues with this cord & plug connected furnace:

[Linked Image]

#101142 02/13/07 01:18 PM
Joined: Mar 2005
Posts: 1,213
I don't see how this is a violation of 400.8. The cord is NOT substituting "fixed wiring of a structure" because it is connecting a serviceable appliance to an outlet. None of the other restrictions in 400.8 apply; this installation isn't trying to skirt cable routing rules, it's just using a plug instead of hardwired conection at the outlet box.

Page 1 of 4 1 2 3 4

Link Copied to Clipboard

Tools for Electricians
Tools for Electricians

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
* * * * * * *

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


Member Spotlight
Sebago, ME, USA
Posts: 109
Joined: January 2005
Top Posters(30 Days)
Popular Topics(Views)
297,776 Are you busy
228,515 Re: Forum
213,347 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5