How to Replace a Three-Wire Power Cord With a Four-Wire Power Cord

Older 220 volt AC outlets are equipped with three wires. This presents a potential problem for people purchasing newer appliances, such as a clothes dryer, that has four. Swapping these power cords is inexpensive and safer than attempting to modify in-wall wiring. All that is needed to complete this task are simple household tools, keeping the installation compliant with the National Electrical Code. Replacement cords are available at nearly any major home improvement store or location that sells appliances.

• 1

  Access the rear of the appliance requiring the cord swap. Remove the screws holding on the metal or plastic panel concealing the flying lead end of the power cable.

• 2

  Unscrew the existing three-wire power cord, and remove the small metal grounding strap located below the other three wires.

• 3

  Screw the green wire on the four-wire cord where the ground strap used to be. Screw in the other three wires, aligned with three wires on the other side of the buss bar inside the appliance.

• 4

  Replace the panel that conceals the flying lead on the power cord and buss bar.