Originally Posted by jimex
Thanks again! Great info on electrical. I'm a bit of a techie and really enjoy reading this stuff.
Sent from my iPad using Forest River Forums
And thank you for allowing me a semi-hijack on your thread.
It's just important that those reading, know that the 30 amp RV outlet is ONLY 120 volt and has three wires, a hot, a neutral, and a ground.
It's when electricians (or homeowners) mistakingly believe that the 30 amp RV outlet is 240 volts, that bad things happen. They wire it with TWO hots (each at 120 volts), and usually a ground. Usually NO neutral is connected.
This is when you burn up things. You will also burn up a 50 amp RV connecting to a miswired 3-wire outlet, using an adapter...since the adapter shares the 240 volts across both legs in a 50 amp RV (which normally only has 120 volt per leg)
Looking at the schematic below for how outlets are properly wired, and even using an adapter on a 50 amp RV..... you will notice that the TT30 outlet has a L1(120 volt hot), a neutral, and a ground.
Now imagine that the neutral has been replaced with the L2(another 120 volt hot). This is what many electricians do, when they miswire the outlet using an also incorrect double pole breaker....and therefore you have 240 volts feeding the RV. Bad stuff.
Even though a 50 amp RV has two 120 volt hot legs (L1 and L2) feeding it, the RV's inside electrical distribution panel utilizes each leg separate, so that everything is STILL only 120 volts.......but you have two 120 volt legs each capable of providing 50 amps of power per leg, or 100 amps total.
So in conclusion, whether you use a 120/240 volt split phase 50 amp outlet, a 120 volt 30 amp outlet, or a 120 volt 15 amp outlet.....you are most always going to be using 120 volts only.