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Dryer Wiring Question #190394
11/15/09 04:53 PM
11/15/09 04:53 PM
T
Terp93  Offline OP
New Member
Joined: Apr 2007
Posts: 5
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?

Work Gear for Electricians and the Trades
Re: Dryer Wiring Question [Re: Terp93] #190395
11/15/09 05:00 PM
11/15/09 05:00 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
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.

Re: Dryer Wiring Question [Re: renosteinke] #190397
11/15/09 06:10 PM
11/15/09 06:10 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,290
Estero,Fl,usa
I hope he tested the integrity of that conduit as a grounding path.


Greg Fretwell
Re: Dryer Wiring Question [Re: gfretwell] #190399
11/16/09 12:23 AM
11/16/09 12:23 AM
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
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

Re: Dryer Wiring Question [Re: Niko] #190401
11/16/09 12:40 AM
11/16/09 12:40 AM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,290
Estero,Fl,usa
I would use my Ecos tester. That verifies < 1 ohm under a load.


Greg Fretwell
Re: Dryer Wiring Question [Re: gfretwell] #190407
11/16/09 11:09 AM
11/16/09 11:09 AM
T
Terp93  Offline OP
New Member
Joined: Apr 2007
Posts: 5
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

Re: Dryer Wiring Question [Re: Terp93] #190437
11/18/09 11:21 AM
11/18/09 11:21 AM
T
Terp93  Offline OP
New Member
Joined: Apr 2007
Posts: 5
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?


Re: Dryer Wiring Question [Re: Terp93] #190438
11/18/09 12:15 PM
11/18/09 12:15 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
How about calling the guy you hired back, and asking him to do it?

Re: Dryer Wiring Question [Re: renosteinke] #190439
11/18/09 12:21 PM
11/18/09 12:21 PM
T
Terp93  Offline OP
New Member
Joined: Apr 2007
Posts: 5
Colorado
That sounds like a plan.

Re: Dryer Wiring Question [Re: Terp93] #190449
11/18/09 10:30 PM
11/18/09 10:30 PM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
Circuits with OCPD at 30 Amps will require #10 grounding conductors unless the raceway/EMT is suitable.


Tesla
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