Wayne Dohnal wrote:
Because of capacitive and/or inductive coupling, an ungrounded RV will assume a potential above ground potential, at a non-hazardous current level. If the coupling was perfectly even between the ground and hot and neutral, a 30 amp RV would float at 60 volts. Most power converters are a major contributor to this effect, but even the wiring plays a role.
While I agree that most RVs will "float" without the ground connection, the problem is it is difficult for the average user to tell whether the tingle they feel is the normal "float" or a fault that could cause a dangerous shock hazard. The importance of a good ground connection cannot be over emphasized.