Originally Posted by ironj
Im still not sure how it works. ..because with just one leg plugged in my trailer will attempt to run BOTH ac if you accidentally turn em on. (Obviously breaker trips) so what is wired to what and how does that work?...I have a progressive panel....still not convinced there IS a benefit to putting 30 to one leg over the other?
Sent from my SAMSUNG-SGH-I747 using Forest River Forums mobile app
Which breaker trips? I assume it is the main service breaker at the pedestal?
Most of the panels these days will "jump" a single 120 volt leg to run the other leg of the panel when it detects only a single leg of power. Back in the old days people used to do this manually by wiring a breaker that would accomplish the same thing. Of course the downside to auto switching is you will pop the pedestal breaker if you try to "cheat" and pull over 30 amps. The adapters give you power down both legs of the 50 amp plug, with the obvious current/amperage limits.
The other way people used to do this was to wire the second AC with it's own service cable @ 20 amps. They would plug the 30 amp coach service cable into the 30 amp and the second AC into the 20 amp.
Finally, there is one other issue with these adapters. In many parks (especially older ones), the pedestal is only serviced by 30 amp 115 volt service. They put both a 30 amp plug and a 15/20 amp plug in the pedestal as a convenience to the patrons. The problem is the service cable running the pedestal is not rated to have a 50 amp draw. Pulling 45-50 amp through these pedestals has the potential to overheat the pedestal service and cause a fire. I have not seen such a thing reported, but it is certainly possible. I would check with park personnel before you use these adapters just to make sure.