30A dryer wiring


Old 03-02-14, 09:07 AM
Thread Starter
Join Date: Nov 2013
Posts: 225
Received 0 Votes on 0 Posts
30A dryer wiring

Need to run #10 black, red, white, green for 30A dryer. This is in emt. So I think I can use the conduit as the ground. If so I connect to the back of the box with a ground pigtail. Does that pigtail have to be #10?

Or should I be pulling a #10 green/ground back to the panel (50')?
Sponsored Links
Old 03-02-14, 09:15 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 58,457
Received 1,026 Votes on 952 Posts
If you are using a 1900 (4" square box) then you can use a green ground screw in the back of the box to a jumper to the receptacle. The conduit is considered a grounding method. The pigtail does need to be #10.

I like pulling a ground even thru conduit. You could use #10 green in this case.

Sorry for the confusion on my part.

Last edited by PJmax; 03-02-14 at 01:49 PM. Reason: corrected incorrect information
Old 03-02-14, 11:00 AM
Join Date: Jun 2012
Location: USA
Posts: 1,588
Received 39 Votes on 35 Posts
NEC table 250.122 shows minimum size is #10 copper for grounding a 30 amp circuit. I didn't think that there were any exceptions.
Old 03-02-14, 01:16 PM
Thread Starter
Join Date: Nov 2013
Posts: 225
Received 0 Votes on 0 Posts
So which is it then? Can I use a #12 Ideal pigtail from the outlet to the box, do I have to run #10 all the way back to the panel or do I have to try to get a #10 around a grounding screw (that's not gonna work out well?)
Old 03-02-14, 01:22 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,142
Received 83 Votes on 71 Posts
You can use the conduit as a EGC with a #10 pigtail between the box and receptacle or run a #10 back to the panel.

A #10 can be used with the ground screw.
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: