I am out of room for extra breakers in my breaker box. I have a 220 3 wire outlet for my welder in the garage. Can I branch off of that outlet and install a 4 wire rv outlet if I run a separate neutral wire back to breaker panel? Would like to have both outlets and no adapters and I will not be using them simultaneously.
I would, as long as you provide the Neutral, you're golden but I'm sure some here are going to cringe. Be warned, there are going to be some people here that misread your post and go on and on about how you're going to fry your RV.