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#59656 - 12/12/05 04:42 PM 3 wire for new construction?
NJ Wireman Offline
Member

Registered: 08/26/04
Posts: 179
Loc: New Jersey (South Jersey)
I was told that for the new 2005 code that (NM) romex for applainaces ie; water heater, ac disconnect, dryer must now be in 3 wire. Is this true and if so can some one please state a code # reference. I am racking my head trying to find this but have been unable.

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#59657 - 12/12/05 04:50 PM Re: 3 wire for new construction?
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
There is no such NEC requirement, a 2 conductor with ground is all that is needed

Roger

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#59658 - 12/12/05 04:52 PM Re: 3 wire for new construction?
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
You can not feed a 240/120 dryer with a 3 wire.
_________________________
Bob Badger
Construction & Maintenance Electrician
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#59659 - 12/12/05 05:01 PM Re: 3 wire for new construction?
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
One must ask the question right, to get the answer right :-)

At one time- not so long ago- it was the practice to "ground" the case of a range or clothes dryer by bonding it to the third wire- which also served as the "neutral" for any 110 loads the appliance might have had.

This is no longer allowed on NEW dryers and ranges, nor is it allowed to run NEW circuits this way. Section 250.140 is the place to start reading...

So, today, we no longer bond the case to the "neutral" wire. We run an additional wire to serve as the ground wire.

If an appliance has no 110v loads, then the third prong of the plug is a true "ground" prong.

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#59660 - 12/12/05 05:12 PM Re: 3 wire for new construction?
NJ Wireman Offline
Member

Registered: 08/26/04
Posts: 179
Loc: New Jersey (South Jersey)
so renosteinke
then would you or wouldn't you use 3 wire?

i have done several ovens micro/convection over the last year where they came with a set up of a black , a red, a neutral and a ground? for a 220 set up 30 amp and man i must say i love this place that was quick 3 responces in no time. Gotta love it thanks kenny

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#59661 - 12/12/05 05:20 PM Re: 3 wire for new construction?
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Whoa, I only (stopped reading at) read "water heater and ac disconnect", shame on me.

Iwire and John are correct, on 120/240v appliances, a three insulated conductor with equipment grounding conductor wiring method must be used.


Roger

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#59662 - 12/12/05 05:36 PM Re: 3 wire for new construction?
NJ Wireman Offline
Member

Registered: 08/26/04
Posts: 179
Loc: New Jersey (South Jersey)
but john says yes and i wire says no?

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#59663 - 12/12/05 06:05 PM Re: 3 wire for new construction?
Electricmanscott Offline
Member

Registered: 01/12/02
Posts: 1478
Loc: Holden, MA USA
Two hots, one neutral and one ground (very untechnical I know) require two hots, one neutral and one ground feeding it.

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#59664 - 12/12/05 06:08 PM Re: 3 wire for new construction?
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
NJ Wireman, actually I think John and Iwire are saying the same thing,

Iwire said
 Quote:
You can not feed a 240/120 dryer with a 3 wire.


I think Iwire means there must be four conductors

John said
 Quote:
So, today, we no longer bond the case to the "neutral" wire. We run an additional wire to serve as the ground wire.


Roger



[This message has been edited by Roger (edited 12-12-2005).]

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#59665 - 12/12/05 06:58 PM Re: 3 wire for new construction?
NJ Wireman Offline
Member

Registered: 08/26/04
Posts: 179
Loc: New Jersey (South Jersey)
I see i thought when he said three wire, i mis understood. I thank all for their help.

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