The same 50-amp 220-volt electric source that powers an electric range can supply electricity to a hot tub or a clothes dryer. If each appliance had a plug the same shape and size, then they would have the ability to plug into the same outlet. Two types of 50-amp 220-volt plugs connect to a home's power source. A plug with three prongs uses three wires, two 110-volt hot wires and a ground. A plug with four prongs uses the same three wires plus a neutral wire.
Remove 1-1/2 inches of the plastic covering of a 6-gauge wire set with a razor knife. A 50-amp plug requires at least 6-gauge wire. A wire set has have three or four 6-gauge insulated wires inside of a plastic covering. Each wire has its own colored insulation: white, black, green and red.
Strip 1/2 inch from the end of each 6-gauge insulated wire with a razor knife. Six-gauge wires have several smaller strands of wire braided together inside of the insulation. Score a line around the wire 1/2 inch from its end, then slice the wire from the score mark to the end of the wire. Pry the insulation off of the braided wire and cut it free along the score mark. Repeat this for each insulated wire.
Unscrew the plug's housing from its base with a flathead screwdriver. The plug housing's mounting screws, located under the plug near the plug's prongs, screw through the base and into the plug's housing.
Pull the plug's housing off of its base. This reveals the plug's wire terminals and identification tags. The tags, found molded into the base next to the wire terminals, have labels that read "L1," "L2" and "G" for plugs with three prongs; plugs with four prongs have labels reading, "L1," "L2," "G" and "N" or "C." In some cases the letters "X" and "Y" replace the labels "L1" and "L2."
Push the plug's housing over the 6-gauge wire. The part of the housing that connects to the plug's base must face the wire ends.
Push the 6-gauge wire's ground wire into the plug base's "G" terminal and tighten the terminal screw with a flathead screwdriver. Wire sets with three 6-gauge wires use the middle or a green wire as the ground wire. Wire sets with four 6-gauge wires use the green wire as a ground.
Push the 6-gauge black wire into the plug's "L1" or "X" terminal. Tighten the terminal screw.
Insert a 6-gauge wire into the plug's "L2" or "Y" terminal and tighten the terminal screw. Three-wire plugs use the remaining wire, colored either white or red, and four-wire plugs use the red wire for the "L2" or "Y" terminal.
Insert the neutral wire into a four-prong plug's "N" or "C" terminal and tighten the terminal screw. Four-wire plugs use the white wire as the neutral.
Slide the plug's housing to its base and tighten the plug housing's mounting screws.