When I installed an outlet for our Motor Home parking, even though it is set up for a 50A service, I went with a 30A service and outlet, and use an adapter. This was because with the distance I had to run, and the cost of wire for 50A as opposed to the cost for 30A. As we do not need 50A when parked at home, the 30A service was less that half the cost of what a 50A would have been. Abou all we need is just to keep the batteries charged, and the TV sometimes. If necessary, I can run one of the ACs on 30A just fine. An, like it said, it cost half as much. And no worry about it being wired wrong.