My workshop (attached garage) is currently wired with 110V receptacles fed from the main panel in the house by #10/3 with ground (1 black, 1 red, 1 white, 1 ground) attached to a double-pole 30A breaker.
I'd like to power a 13A, 220V table saw, and need to install a 220V receptacle. It would also be convenient to install a couple of "extension" receptacles around the perimeter so that I have of the option of changing my shop layout. I see two options, and would welcome advice.
Extend the existing wiring around the shop, using double-ganged boxes for a 110V receptacle on one side, and a 220V receptacle on the other side. The 220V receptacle would use both hots and the ground, and for the 110V side, I would draw from either hot leg to create a split receptacle.
Install a subpanel in the workshop, fed from the currently-installed 30A breaker in the main panel, and create separate circuits for 110V and 220V. Each circuit would receive its own breaker.
- Option 1 seems most straightforward. But is it correct or safe?
- If choosing Option 2, what size breakers should I use for the 110V and 220V circuits?