Quote:
Originally Posted by Fat Charlie
Cut the drywall. It's the easiest thing to cut and you can replace it afterwards.
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Seconded. I too would not double occupy the ground passage.
If your wall is deep enough to not have contact the two boxes on the outside wall can be back to back but it is usually easier to have some offset. Also be sure not to mix 240 and 120 in the same box. I think you need a shut off near the 240 outlet. And all the outlets inside the garage and out side need to be GFI.