<strong>Yahoo Message Number: 98100</strong> I received question from a electrical vendor today who will be installing a 50 amp service box at my Son home for me. This is the question:<br/><br/><br/>"Also is your dad's RV a four or a three wire hook up?" <br/>I think for us that have 50 amp we are all four wire, two 120 v from each side of neutral. Can anyone in the group have a good answer I can send...