smkettner wrote:
Lowes Item #: 246872 | Model #: 3830-CC6
http://www.lowes.com
Nema 30-tt outlet with box:
Item #: 242306 | Model #: CHU4S
http://www.lowes.com
Lowes also has a box with 30-tt and 5-20 GFI outlet and breakers but then it gets into the $200 range.
I installed the second of these for my RV. In my case, I thought it simplest to run the wires to the box from the soffit (inside of EMT), and I had to special order the hub adapter for the box to attach the conduit to. An alternative would be to use the knockouts in the bottom of the box and a couple of bends or elbows, but that seemed untidy and prone to collecting moisture.
Lowes also sells heavy-duty light switches rated at 30A. One on the inside of the house/garage makes a dandy disconnect switch that doesn't cost an arm and a leg.