Split 30amp into two 15amp circuits

DrewE wrote:

LittleBill wrote:
there is literally no need for a main breaker, don't even know why people are suggesting it.

wherever he plugs in will protect the wire from the rv to the receptacle, the smaller breaker will protect the wire inside the rv.

The NEC requires a main disconnect (i.e. a main breaker, or a switch and fuses) when more than two branch circuits are used. If only two branch circuits are used, it's apparently not actually required, but still IMHO a very good idea for a couple of reasons:

1. It gives a good way to shut off the 120V power to the RV for performing maintenance or in the case of an emergency. This is likely the main reason the NEC requires it.

2. If you plug into e.g. a 50A RV receptacle and have no main breaker, a short in the electric panel or excess current use by the combined branch circuits could overload the shore power cord.

I'd rather be safe than sorry, particularly since a 30A breaker is not all that expensive.

In my dual 30A service I now have on my trailer my added load center at the trailer has only two 15A CBs (no 30A main) and you concern about the combined branch ckts overloading the shore power cord is not valid since they cannot overload the shore power cord if you are connected to a 50A pedestal power with a dogbone adapter. This is no different than using a 50A to 30A dogbone to feed a 30A trailer. Besides code requirements you have a 30A main on a typical trailer setup because the individual breakers add up to more than what the shore power cord and/or main service is capable of supplying.

Larry

Larry