DrewE wrote:
I would suspect it's 208 volts and you have two phases of a three phase system going to it. The only way to know for sure is to measure the voltage. It really makes no practical difference whether you have 208 or 240 volts between the legs as far as the RV is concerned, provided of course you have a properly installed outlet otherwise. Both would be permitted in campgrounds (and which one you find would depend on the nature of the electrical service at the campground).
Whether the receptacle can be converted as-is to an RV outlet or not depends on what wires are run to it. My hunch is that you would need to run an additional (neutral) wire, which may be pretty straightforward or may be rather difficult, depending on the circumstances.
It's only about two feet from the panel so adding another wire may not be hard, depending on how much room is left in the conduit. I could probably pull the three out pretty easily and pull all four together if I needed too. Don't I also need to change the breaker?