Originally Posted by FDNYdave
A 50 Amp service/RV is 240v when you plug it into a 30 AMP service(120) volts only half of your AC electrical system is energized it's possible ( probable)that the nonfunction systems are on that half of your system that's not energized.
Plugging a 30 AMP RV into a 50 amp pedestal is is a lot more straight foward then pluging a 50 amp RV into a 30 amp pedestal
Uh, in a word: BULL.
You are wrong in your "Where as" and thus half wrong in your Conclusions as well.
50 amp service, is 120/240 volt, not 240 volt, Same as the service to your house.
NOTHING in the RV uses 240 volt unless YOU have added 240 volt stuff (or a previous owner)
So what you get is 2 legs of 120 volt service, Each 50 amp,, Now I can explain why it is done this way but, .. Well, WHY?
The 50 amp plug has 4 "pins"
The round-ish one is safety ground (same on 15, 20 and 30 amp plugs by the way)
Opposite the Safety ground (on a 50) is NEUTRAL.
The sides are Leg 1 and Leg 2 of the 120/240 volt split phase power.
in short "The hot leads"
The 30 amp adapter has 3 pins, Safety ground (Describe avobe)
Neutral, and HOT.
IT connects the HOT lead to BOTH L-1 and L-2
Thus ALL the appliances and equipment gets power. Normally.
I live in a 50 amp Class A and spend much of my time on 30 amp sites so I know of where I speak.
There is such a thing as a bad adapter, I have seen them where either a wire broke, was not well connected or the outlet had one side fail and they only delivered power to one leg.
Oh, why deliver 120/240 power.. Well it's a voltage loss thing.
If you delivered 100 amps at 120 volt you would need much larger (And more costly) wire to haul the current. But by delivering 120/240 at 50 amps, you get the same 12000 watts of power, with 1/2 the current. because you can use every amp twice before sending it back.