30A dryer wiring

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  #1  
Old 03-02-14, 10:07 AM
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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')?
 
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Old 03-02-14, 10:15 AM
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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 02:49 PM. Reason: corrected incorrect information
  #3  
Old 03-02-14, 12:00 PM
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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.
 
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Old 03-02-14, 02:16 PM
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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?)
 
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Old 03-02-14, 02:22 PM
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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.
 
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