Originally Posted by raspivey
Absolutely nothing right now. It was going to an ancient 240V window unit on an addition to the house. The wires are capped and labeled in the panel, but the breaker is still there not being used.
Ok, the reason I was asking was to see if there was existing wiring in place, and if you planned to use such. I was also curious to see if you have 3 or 4 wires running to the whatever the circuit breaker was controlling. You would have to have 4 wires to wire it as a split phase RV service using the 20 amp double pole breaker (or any double pole breaker)
I would check the cost of running the proper 4 wires size (also if you are using existing conduit, is it big enough for this) for a true 50 amp 120/240 split phase service as opposed to the proper 3 wires size for a 30 amp 120 volt outlet.
You may find out it's not too terribly much more, and then decide to just pop out that 20 amp double pole breaker and replace it with a 50 amp double pole breaker. You would then run the appropriate size wire for this, and install a 50 amp outlet. This way you could run what you need in your RV.
The only drawback (besides the initial cost of the wire, outlet and 50 amp breaker) is what size service your main panel has at your house. I wouldn't attempt this if you have anything less than a 100 amp main service, whereas 150 or 200 amp would be better.
You would have to see what all amps everything else in your house uses, and make sure not to overload the main, if using your RV at the same time.
It's ultimately your call, and you can decide what works good and fits your budget best.
This is a great link below to a site to peruse. They also have recommended wire sizes for the different applications as well as the wiring schematics/outlets for each. You can check out the 50 and 30 amp links, to help you figure it out....then price the stuff online at lowes, home depot, etc. to give you an idea.
and make sure to click on their pdf's like this