Tom is right. It is exactly like house wiring, 4 wire, hot 1, hot 2, neutral, and ground. It does have 240 vac coming in, but it is used internally as two 120 vac lines. Few 5ers use anything needing 240 vac, but some larger motor homes do sometimes have 240 vac devices. Although some people have installed 240 vac clothes dryers in their 5ers.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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