This is a followup question to this answer

I plan to do something quite similar to the diagram Tester101 posted. I will pull 3-wire (10/3+g) into a junction box and then pull 2 separate 2 wires (12/2+g) from the J box to GFCI outlets. Here are the things I am looking for clarification on...

--Can I run two 20amp circuits with the above configuration?

--If so, will the dual pole breaker be labeled "40 amp" back at the panel? (like a large appliance 240v breaker, or is there some other kind of dual pole breaker that I should look for?)



You'll use a double pole 20 ampere breaker. It will have two handles that are tied together, and will say "20" on the handles.

It should look similar to this...

enter image description here
(source: homedepot.com)

I'm not sure why you're planning to run 10 AWG conductors, but typically 20 ampere circuits only require 12 AWG conductors.

  • That's helpful, thanks. One addendum to this question: Does it matter if the two circuits that share a neutral do not both go to GFI outlets? I am thinking of using one circuit for an electric stove top and the other for a GFI outlet. Any problem with that configuration (in terms of GFI tripping or otherwise)? – Mateo May 3 '15 at 18:30
  • No, both legs do not have to feed GFCI receptacles. Not sure about the legitimacy of using one leg for a cooktop though. – Tester101 May 3 '15 at 18:53
  • Why might the cooktop be a problem? This is a 110v 2-burner cooktop rated to be used on a single 20amp circuit. Is it a code issue perhaps, that the cooktop is supposed to have its own "dedicated circuit"? – Mateo May 3 '15 at 18:58

Yes, this is a perfectly valid configuration.

The breaker will be labeled as a "20 Amp" breaker. The breaker ratings are per-conductor and not total current.

They generally look just like the "large appliance 240v breaker", though there do exist some which put four breakers in one module called a "quad". One uses the quad breakers when there are no empty slots in the breaker box (though one must double-check that the box is certified to be able to be used with the "quad" breakers").

  • How would a quad breaker help if there were no empty slots? – Tester101 May 3 '15 at 2:29

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