Quote:
Originally Posted by diugo
I got the impression that no breaker is ganged, so both panels are strictly 120V. When he refers to double breakers or "20 20", I think he means type BRD---two half-height breakers in a full-height slot.
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Ganged circuit breakers are fairly common. They are used for inputs to power panels. In the event of a problem in a 50A setup, you would want both hots to trip at the same time. In a 30A setup, you still want them ganged so that both hot and neutral open, since neutral is also a current carrying leg. I'm not completely familiar with the 50A panels used in RVs, but in marine 50A panels, we actually use a three pole ganged curcuit breaker so all three legs trip, two hots and a neutral. In the household type panels I've seen, the neutral is not switched, only the hots, and all the neutrals go to a common buss bar for each leg.
That's why I was confused, and still am, when the OP called them main breakers and wanted to replace one of them.