How to Make a Two-Wire, 250-Volt Electrical Circuit

Screw the plastic wiring box to a stud with a screwdriver at the location required using round-head screws. Install sheathed cable between the wiring box and main circuit breaker panel. Have enough cable at the wiring box to insert 10 inches into the box and 4 feet into the main panel.

Remove 8 inches of sheathing from the cable at the outlet wiring box with the cable stripper. Remove 4 feet of sheathing from the cable at the circuit breaker panel.

Insert the cable into a cable hole in the back of the plastic outlet wiring box. Strip 3/4 inches of insulation from the end of each of the two insulated wires with the cable stripper. Color the last two inches of the white wire's insulation black with the permanent marker. Insert the end of the bare ground wire 3/8 inch into the terminal bending hole on the cable stripper and bend the wire end in half. Repeat for the two insulated wires.

Turn all three terminal screws on the outlet counterclockwise to loosen them. Place the bare ground wire around the green ground terminal and the other two wires around the remaining terminals. Turn the terminal screws clockwise to tighten them.

Push the outlet into the wiring box as you fold the wires behind it. Fasten the outlet to the wiring box with the supplied screws. Place the outlet cover over the outlet and fasten it in place with the screw or screws.

Turn off the main circuit breaker and remove the screws that hold the panel cover in place. Lift the panel cover off and set it aside. Install the two-pole circuit breaker according to the type and manufacturer. Most hook onto a bar, then press into place and click when they seat.

Insert the cable into the main panel. Guide the bare ground wire neatly to the ground bus, identified by the bare wires attached to it. Cut the wire to length and insert the wire 1/2 inch into a terminal position and tighten the terminal screw. Neatly route the remaining two wires to the new circuit breaker and trim them to length. Strip 1/2 inch of insulation from the wires, insert the bare ends into the circuit breaker terminals and tighten the screws.

Remove two breaker positions from the panel door to make room for the new circuit breaker with the pliers to bend the rectangular tabs off. Replace the panel cover and install the screws. Turn on the main circuit breaker and the new circuit breaker.