My feelings are. If you the RV owner. That has no electrical knowledge, and hire a professional electrician, you expect that you will not have a blown A/C or whatever else fried. Case in point. I was running a contract in Salt Lake City in the federal building, I had my friend that I trained and I figured it was time to let him have a little freedom. We were doing a 480/277 panel (lighting panel) and I let him wire it up. I was in a hurry (had to get each panel done in an evening) I didn't check his work, (totally my fault) and he hooked up a neutral to another breaker (greys are neutral in 480/277 and I disagree with that practice) and when we powered up the panel we fried 300 light fixtures. It was my fault, not the federal building's fault. I should have checked his work. My Father was livid and he had a right to be (his company) and it was my fault. So the thing is, the electrician is at fault if he hooked up both hots to the 30ap receptacle. He/she should know better!!!!!
