How To Wire a Square D QO220GFI 240v, 20-amp Double Pole Breaker

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Chuck B

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Hi Guys:

I'm wiring a new 240v, dedicated 20-amp GFI protected circuit for a cottage bathroom wall heater. Just purchased the above breaker and now when looking at it I am a bit perplexed. Have wired a lot of 110, some 220 but no 220 GFI breakers. Licensed builder, not electrician.

The white curled wire from the breaker goes to the neutral bar on the QO panel bar. Correct?!

I see two "top of the breaker" brass screws on the breaker adjacent to one another that I believe are the black and white (taped/marked black for "hot") load power lines to the 240v wall heater.

Note: The wall heater ONLY has two leads and a grounding screw available.

Confusion: Where does the bare copper ground wire go? To the ground bar or the breaker as described
next?

Next to the curled up white wire on the breaker that I attach to the neutral bar on
the panel, there is an open spot on the breaker for a third wire.
What should go there? The bare copper wire? Instead of attaching it to the ground bar on the
panel? Or is that just there for a 3-wire system (black, red, white) and can I leave blank.

Thanks.
 

Stuff

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Yes, the white curly-q goes to the neutral bar and the bare copper goes to ground. Leave the 3rd terminal on the breaker unused. This is normal for a true 240 volt load.
 

Speedy Petey

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Did you know that the GFI breaker was not required? Or did it require it in the instructions (which I have never seen btw)?
 
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