+1 with Dan...
Another on codes- Usually a garage ceiling with a living space above or garage wall with adjacent living space is double layer of sheet rock to act as a firewall.
Next EZ-Boxes are also called remodel boxes. It's an easy box to install. You cut the hole with a very tight fit. When you tighten the screws in it, it possitions 2 arms that swing out behind the sheet rock and sandwiches the sheetrock between the arms and the lip of the box. I'll say again- trim to a tight fit (or the lip won't hold).
I have an outlet every 4 feet, then one on each side of my garage door. ! have 4 240v outlets, but I have welding equipment, my shop compressor, one I use as input power from my Generator (when needed)... and a Wolfe Tanning Bed.
Usual expense is with the breakers, rather than the wire... Also check with a local hardware store on codes... Some local is garage with GFI. Mine was this way, I have the GFI outlets daisy chained to other outlets on some circuits. One I have a GFI breaker.
Things that are around 15 amp and cycle (start/stop/start...) Should be on their own circuit.
Last edited by MAFoElffen; 06-23-2012 at 11:57 PM.