A 30 amp plug has three prongs – a 120 volt hot wire, a neutral wire and a ground wire – and is generally used on RVs with lower load requirements. A 50 amp plug has four prongs – two 120 volt hot wires, a neutral wire and a ground wire – that supply two separate 50 amp, 120 volt feeds.

Does a 50 amp RV run on 110 or 220?

Can I plug my 50 Amp RV into 110V or 220V? Yes, it is possible to plug a 50-amp RV into almost any 120v electrical service and not damage your RV. But 220V service should never be connected directly to your RV. All RV electrical systems use 120V electrical service.