LTLFTcomposite wrote:Why do you have a 50 amp breaker on the home unit instead of 40?
I'm beginning to think that Lasareath here doesn't quite have the knowledge yet to avoid burning his house down - these are all basic electrical questions and either one needs to do the research to learn them, or one should hire an electrician. For a short run like this, the cost should be nominal. Certainly cheaper than dealing with a garage fire.
1. Circuit breakers should never be oversized for the wire and devices they protect. Break this rule and YOUR HOUSE WILL BURN DOWN!
2. Wires should be sized according to NEC rules. Oversize your conductors and you also must oversize your ground. Ignore that chart that was posted by joewaters, it does NOT comply to NEC standards. Ignore this warning and YOUR HOUSE WILL BURN DOWN!
Guidelines for a professional install (not necessarily complete!):
0. Pull permit from local jurisdiction.
1. The L6-30 receptacle you linked to is fine. I would mount it in a metal box with metal faceplate. I would personally use a 4x4 box for the extra room.
2. You should be using 10 GA wire for a 30A circuit. You can use NM-B (aka romex) which you can get with 2 HOTs and a ground. It will be called "10-2 NM-B". The 10 is the wire gauge, 2 is number of current carrying conductors. It will have an appropriately sized ground (10 GA in this case). Note that if the romex will not be covered by drywall, you can not use it. Romex is only rated for use where people are not able to touch it. In which cause you must use conduit and individually stranded wire.
3. Make sure your metal box is grounded.
4. You will need a double pole 30A circuit breaker appropriate for your panel. I hope it goes without saying that you should cut power to the panel before working on it!
5. Get work inspected by your local inspector.