bullfrog !
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It gets even more confusing when you discover there are phases of AC power. Most all RVs in the United States use a 30 amp or 50 amp single phase 120 volts. A 50 amp plug in in a garage or house is different than a 50 amp plug in an RV. Grid power in this country offers the use of multiple phases to get higher voltages and therefore higher amperage. A 50 amp plug in in a house in the United States is usually 240 volts multiple phases. Again it pays to check before you plug in and consult an electrician if you are planning on plugging in your RV to the grid with an unknown source.
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