50 amp fiver - 30 amp service

MFL wrote:

Allworth wrote:
Tinner,

I hope the fire doesn't burn anybody elses trailer as yours goes up in a flash. (Pun intended.)

Allworth, I agree with you, I don't see how the wiring and breakers, in a 30-20 pole could handle a 45 amp draw.

I see the adapter in my RV book, it is made by Camco. If they were truly dangerous, I don't see how they could sell them. IDK

Jerry

I'd like to see that adapter. I can't believe that any company would make an adapter that combines two circuits on different breakers. There is nothing to assure that both breakers will break the circuits at the same time. If the 20 amp breaker were to break, the 30 amp breaker is supplying 30 amps to wireing designed for only 20 amps.

EDIT This is an over simplification, but 20 amps requires 12 ga wire, 30 amps requires 10 ga wire, 40 amps requires 8 ga wire and 50 amps requires 6 ga wire. Circuit length and type of load can modify the requirement. The easiest way to provide 30 amps to a pedistal is with 10-2 w/ground wire. By making it 10-3 w/ground, it can support both a 30 amp and a 20 amp circuit. 10ga wire does not support a 50 amp circuit.