As said several times above, there is a lot of confusion about RV power.
The 50 amp 240 volt service to an RV is exactly the same as the split phase service to a home. Wired the same and everything. Two hots, a neutral, & a ground.
We really should look at it just like that. Part of the confusion comes when we try to explain that RV's don't use 240 volts, and that 50 amp service is really 100 amps of power. I also think we should drop trying to inject this into the discussion.
With the 30 amp 120 volt service, a lot of the confusion started many years ago. It was a big mistake to use the triangulated blade configuration for RV power. It's just too close to the old three prong dryer plug, so electricians that were used to wiring up dryers naturally assumed that the RV plug/receptacle was the same. That's why still today a lot of them get wired for 240 volts.
They should have just used the standard 5-30R or the L5-30R twist-lock configuration. That would have made things a lot simpler in keeping the wiring straight, But, as they say, that's water under the bridge.
I'm not sure we'll ever solve the confusion, but we can strive to explain it in simple terms to hopefully lessen the confusion a bit.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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