Using a 30 amp RV outlet allows the RV to use 120 volt service. Before starting, make sure all the power is turned off in the RV. It is important to be safe when working with wiring. To wire a 30 amp RV outlet, simply follow the color coding of the wires, to make sure the old and new are wired up the same. The black wire is the hot wire, the white is neutral, and green is ground. The hot wire connects to the 5 o'clock position on the outlet when looking at the back, where the wires connect. The green goes to the 12 o'clock position, and finally the white is in the last position, opposite the black wire. Replace the outlet. Check everything with a meter, to make sure everything is done correctly, or it could case damage, even catch fire. Once everything is done correctly, turn the power back on and check the outlet.