Pls explain 30amp vs 50amp wiring and breaker

[luberhill]

Ok so is this correct;
say my RV has a 30amp service and I want to wire an outlet in my pole barn. I just use a STANDARD 30amp single pole 110 breaker and run 10 gage romex to the outlet ?

Now lets say I have a 50amp service, I assume I can run that on the 30 amp service but only one side of the line on the RV will be hot ?

Now lets say I want to run a 50amp outlet ....I assume I have to use a 220 50 amp double pole breaker so that it feeds power to both sides ?

And would I need 8gage wire ?

[CA_Traveler]

When you use the 30/50A adapter then all 3 hot legs are connected so that you have 120V everywhere in the 50A RV. But you will be limited to 30A total draw.

Yes dual 50A CB. 50A is 120/240V 50A 4 wire single phase just like a home stove. Use 6 gauge wire. 50A effectively gives you 2x 120V 50A circuits or 100A total as it's a rare RV that has 240V appliances.

[Grit_dog]

Look at wiring diagram for both. That’ll help understand it.

[time2roll]

Yes.

No, the adapter will connect both sides of the RV to the single pole supply. Everything will work to the limit of 30 amps.

Yes.

#8 is only good for maybe 10'.... better to use #6.

[Dave_H_M]

Bumpyroad wrote:

luberhill wrote:


Now lets say I have a 50amp service, I assume I can run that on the 30 amp service but only one side of the line on the RV will be hot ?
?

???

:h need more info or something

[Bumpyroad]

luberhill wrote:


Now lets say I have a 50amp service, I assume I can run that on the 30 amp service but only one side of the line on the RV will be hot ?
?

???

[Ron3rd]

You might consider 8 GA for 30 amp if it's a long run.that's what I used for a 70 foot run

[Ava]

I think you have it figured out correctly. There are several posts about that wiring with good diagrams attached. Try searching it out.