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Joined: Apr 2007
Posts: 5
OP
New Member
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Hello, I have dryer hookup question. I purchased a new dryer, and I hired an electrician to replace the old 1950’s 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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Joined: Jan 2005
Posts: 5,476 Likes: 3
Cat Servant Member
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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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Joined: Jul 2004
Posts: 10,024 Likes: 37
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I hope he tested the integrity of that conduit as a grounding path.
Greg Fretwell
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Joined: Aug 2006
Posts: 356
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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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Joined: Jul 2004
Posts: 10,024 Likes: 37
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I would use my Ecos tester. That verifies < 1 ohm under a load.
Greg Fretwell
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Joined: Apr 2007
Posts: 5
OP
New Member
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Thank you for the help. I’ll ask him if he tested the integrity of that conduit as a grounding path. If the answer is no, I’ll ask him to run an additional EGC to be safe. This site is a great resource.
Thanks again
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Joined: Apr 2007
Posts: 5
OP
New Member
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I’m 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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Joined: Jan 2005
Posts: 5,476 Likes: 3
Cat Servant Member
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How about calling the guy you hired back, and asking him to do it?
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Joined: Apr 2007
Posts: 5
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New Member
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Joined: Jun 2004
Posts: 1,273
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Circuits with OCPD at 30 Amps will require #10 grounding conductors unless the raceway/EMT is suitable.
Tesla
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Posts: 27
Joined: December 2004
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