Well,,,,,,,hate to say it but your electrician might have just cost you hundreds or thousands of dollars in electrical repairs. Right now you should call your electrician and have him verify that he put in a 30 amp 120v RV circuit and not a 30 amp 240 volt electric dryer circuit.
120 volt RV circuit is okay.
240 volt Dryer circuit potentially just burned up a bunch of electronics in your RV.
Electrician should be able to say he wired it Hot Neutral and Ground.
If he wired it Hot Hot Neutral you have a problem.
