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#190394 - 11/15/09 12:53 PM Dryer Wiring Question
Terp93 Offline
New Member

Registered: 04/04/07
Posts: 6
Loc: Colorado
Hello, I have dryer hookup question. I purchased a new dryer, and I hired an electrician to replace the old 1950ís three wire outlet with a four wire outlet. He recommended not replacing the existing wiring, and that the conduit that runs from the outlet to the panel could be used as the ground, so there was no need to run a separate ground wire.

When he connected the new four wire dryer cord to the appliance, he attached the green ground wire to the metal frame along with the yellow/green wire. Now comes the question, should the yellow green wire be attached to the frame as well, or should it be connected to the Neutral post? There is no ground wire going from the outlet to the panel, so this configuration seems correct. What do you guys think?

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#190395 - 11/15/09 01:00 PM Re: Dryer Wiring Question [Re: Terp93]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5299
Loc: Blue Collar Country
SOunds correct to me. Yellow/green is a common identifier for the ground wire, and the whole purpose of the 4-prong receptacle is so that you do NOT connect the ground to the neutral.

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#190397 - 11/15/09 02:10 PM Re: Dryer Wiring Question [Re: renosteinke]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
I hope he tested the integrity of that conduit as a grounding path.
_________________________
Greg Fretwell

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#190399 - 11/15/09 08:23 PM Re: Dryer Wiring Question [Re: gfretwell]
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
Greg,
Integrity of the conduit for an effective ground fault current path has always been my concern. so I always try to install an additional EGC.

How do you test the integrity of the conduit?
_________________________
Be kind to your neighbor, he knows where you live


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#190401 - 11/15/09 08:40 PM Re: Dryer Wiring Question [Re: Niko]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
I would use my Ecos tester. That verifies < 1 ohm under a load.
_________________________
Greg Fretwell

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#190407 - 11/16/09 07:09 AM Re: Dryer Wiring Question [Re: gfretwell]
Terp93 Offline
New Member

Registered: 04/04/07
Posts: 6
Loc: Colorado
Thank you for the help. Iíll ask him if he tested the integrity of that conduit as a grounding path. If the answer is no, Iíll ask him to run an additional EGC to be safe. This site is a great resource.
Thanks again

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#190437 - 11/18/09 07:21 AM Re: Dryer Wiring Question [Re: Terp93]
Terp93 Offline
New Member

Registered: 04/04/07
Posts: 6
Loc: Colorado
Iím going to add a ground wire, but I have a ground wire size question. The dryer feed is a 10/3. Can I use a 12 wire as a ground, or do I need to use a 10?

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#190438 - 11/18/09 08:15 AM Re: Dryer Wiring Question [Re: Terp93]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5299
Loc: Blue Collar Country
How about calling the guy you hired back, and asking him to do it?

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#190439 - 11/18/09 08:21 AM Re: Dryer Wiring Question [Re: renosteinke]
Terp93 Offline
New Member

Registered: 04/04/07
Posts: 6
Loc: Colorado
That sounds like a plan.

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#190449 - 11/18/09 06:30 PM Re: Dryer Wiring Question [Re: Terp93]
Tesla Offline
Member

Registered: 06/16/04
Posts: 1280
Loc: Sacramento, CA
Circuits with OCPD at 30 Amps will require #10 grounding conductors unless the raceway/EMT is suitable.
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Tesla

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