STBRetired wrote:
If you want to be anal use 1 red, 1 black, 1 white, and 1 green. 6 GA would be fine for 25 feet from panel to outlet. 1 inch might be a little tight. I used 1 1/4 inch for mine. I did not use a box with a breaker, but I am thinking about swapping it out so that I can turn off the power from outside. Just a convenience thing, not a code issue.
What ^^^^^^^^^^^^^^ this guy said.
I used 3/4" pvc when I pulled my 30 foot run with 3 of the 6g wires and a 10g ground. I am glad no one recorded what was said. I definitely would not use that size again, but think 1" may be OK. Do get a box with breakers in it so you can turn off the breaker to plug and unplug the RV. GFCI is not recommended on the 50 amp plug, but if you get a box with a 20 amp plug included, that can be GFCI. Even though I own a 30 amp RV. While I was doing the work I decided to plan for future RVs. I used a 50 amp/30 amp/20 amp box with breakers. I am running it off of a 50 amp breaker in the house, so I can not use all 3 outlets to max amperage, but 100 amps (50 amps on each leg) is plenty for me.