I have removed an old AC unit that ran off 220v and replaced it with a new unit that is 120v. It is #10 wire with black, white and bare copper. It used to be a feed to an old hot tub but when the last AC unit was installed they just used the circuit for that. When installing the new plug can I just move the common from the hot side of the double breaker to the grounding bar or do I need to change out the breaker?

Black to the breaker, white to the neutral "bar" and ground to the grounding "bar" Change the breaker to a single pole, 20 amp and install a blank where the other pole of the dbl pole breaker was.

Black to the breaker, white to the neutral "bar" and ground to the grounding "bar" Change the breaker to a single pole, 20 amp and install a blank where the other pole of the dbl pole breaker was.

The breaker is in a box below the meter. There seems to be only one grounding/neutral bar. Can they be hooked to the same bar?