Buried 50A power to my RV
Yes, I should get an electrician to do this. That said: Right now, my 50A cable is stretched out along the edge of my driveway. I have a 50/30 dogbone connecting my 30A extension then a 30/15 adapt...
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PVC with a minimum #6 THHN wire would be this former sparky''s course of action. Personally, I'd go #4, but wouldn't harp too much if you opted for the #6 to save a few bucks. Don't know where you're located, but in my neck of the woods, PVC expansion couplings on the above ground risers are a must-have component. Don't be afraid to at least ask your sub-panel electrician to quote the whole job. The sub-panel is maybe a 1/2 day job at most. If it were my job, I'd lay a pretty sharp number down for you to fill some more time and not have to bounce to 2 jobsites for a day's work...especially if you were to dig the trench (Sparkies hate shovels!!!!).
