Originally Posted by rowdydog77
I have a 30 amp trailer, if I plug into a 50 amp breaker using an adapter won't I be getting 220v? Aren't all 50 amp breakers 220v?
In simple terms, a 240 volt service consists of 2 out of phase 120 volt legs. You commonly call each 120 volt leg , L1 and L2.
You only get 240 volts when you combine the L1 and L2 legs. If they are kept separate, then each leg is only 120 volts.
A 50 amp RV, normally utlilizes each leg separate. The RV electrical panel uses L1 to power certain things, and uses L2 to power other things................never combining the two legs to get 240 volt power.
When you use an adapter, it only takes one leg (either the L1 or L2 but not both from the pedestal) and provides 120 volt to your 30 amp trailer..............and doesn't combine them to get 240 volts since it's only actually using one leg.
On the opposite spectrum, you can use a different kind of adapter that let's a 50 amp RV plug into a 30 amp outlet. This adapter shares the 30 amp 120 volt to both the L1 and L2 sides of the RV. However you are limited to 30 amps total power when connecting to a 30 amp outlet, instead of the 100 amps normally available. (50 amps per leg X 2)
This site may help explain it better.