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Something else to note between the 30 and 50.
Thirty amp is strictly 120VAC, hot, neutral, and ground.
Fifty amp is 120/220VAC, hence the four wire plug. you have TWO hot wires, a neutral, and a ground.
Had a friend get his trailer fried because the local handy man transferred the wires from the fifty to the thirty because the thirty was having problems and he didn't know what he was doing. Instead of grabbing the hot, neutral, and ground, the idiot grabbed the two hots and a ground pumping 220 into the 110 trailer system. Can we say smoke signals anyone?
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