All electric ranges require a 220/240-volt power outlet to supply power to the range. The outlet has either three or four prong receptacles, the number of which depends on the building codes in effect at the time of the outlet's installation. Older building codes permitted the grounding of appliances using the neutral wire, while newer building codes require a dedicated ground line, resulting in a fourth prong. If you are moving from a new house to an older house, you likely need to change the power cord on your range from a four-prong to a three-prong cord.
Unplug the dryer from the power outlet.
Remove the terminal block cover, located on the rear of the dryer. Remove the three screws from the terminal block, securing the power cord wires to the terminals.
Remove the grounding screw, located to the side or above the terminal block.
Loosen the screws on the power cord strain relief, then remove the old power cord.
Insert the new power cord through the strain relief, ensuring that the wires can easily reach the terminals. Tighten the screws on the strain relief to secure the cord into position.
Insert the grounding screw through the grounding strap, then reinstall the ground screw. Position the grounding strap so that it falls over the center terminal.
Insert one of the terminal screws into the connector on the end of the white wire. Install the screw through the hole on the grounding strap and into the center terminal. You must connect the grounding strap to both the center terminal and the grounding screw to ground the dryer properly.
Insert one of the terminal screws into the black wire connector. Connect the screw and wire to the left terminal.
Insert the other terminal screw into the red wire connector. Connect the screw and wire to the right terminal. On some power cords, there are two black wires, rather than one red and one black. Connect the other black wire to the right terminal if this applies to your cord.
Replace the terminal block cover, using the screw that was removed to secure it.