Locate one probe in the other hot receiver and keep the probe in the neutral receiver the reading should still be 120 volts. Locate one probe in one hot receiver and the other probe in the neutral receiver the reading should be 120 volts. Use your voltage meter, set on 240 volts as per the manufacturer’s instructions, to test the outlet before plugging the RV in for the first time. Switch the main breaker back on, and switch on the double-pole breaker serving the new 50 amp outlet. The red and black wires are interchangeable, meaning that it does not matter which hot receiver either wire is connected to. The two hot wires are phased at 180 degrees from each other, which is how twin 120-volt supplies are delivered to the RV rather than one 240-volt supply. Wire the two receivers to either side of the plug, which are at three and nine o' clock on a clock face, to the two hots, a red wire and a black wire. The terminal screw will be painted white. Wire the receiver directly below the half-round, which is at six o' clock on a clock face, to neutral, a white wire. Wire the receiver directly below the half-round The terminal screw will be painted green. Wire the “U” shaped receiver, properly called the “half-round,” which is at twelve o' clock on a clock face, to ground, a green or bare wire. Connect the green or bare wire to the grounding block. Connect the white wire to neutral bus-bar. Connect the red wire to one terminal on the outlet side of the breaker, and connect the black wire to the other terminal on the outlet side of the breaker. Locate an unused double-pole 50 amp breaker, or install a double-pole 50 amp breaker in a vacant location. Locate an unused double-pole 50 amp breaker The supply to the breaker board will typically be split single phase, meaning two hot wires serve the breaker board along with a single neutral connection and a single ground connection. Disconnect the breaker panel which will serve the new 50 amp outlet by shutting off the main breaker.
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