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This may help. You will need a 3 conductor with a ground to wire an RV 50 amp circuit. Most strictly 240V circuits (hot tubs, home AC’s, etc) have 2 conductor with a ground. Since RV’s are 120V, you need 3 conductors (2 hot wires and one neutral wire) along with a ground so your RV will have 2- 120V circuits. This is similar to your power panel on your home, each side of your panel is 120V (but 180 degree out of phase with each other).
If you measure each hot wire to the neutral it will read 120V, if you measure across the hot wires it will read 240V
It is important if you install a 4 wire 50A receptacle to assure the wires are landed in the correct location to avoid having one of the hot wires landed where the neutral goes which would light one of the 120V sides with 240V.
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