3 Wire To 4 Wire Dryer Cord. Next where the wires are connected to the electric dryer you will need to remove the bonding jumper which goes between the frame grounded screw and the neutral terminal as shown in the 3 wire hook up wiring diagram below. Changing dryer cords from 4 wire to 3 wire tools and materials.
It s much easier and much less expensive to replace the 4 wire whip with a 3 wire whip. You are no longer allowed to install a three slot dryer outlet and if you move into a home with the newer four slot outlet your old three prong dryer will need to be refitted with a four prong cord. The only difference is the addition of an isolated ground wire separate from the neutral but the 3 wire circuit is still fine and does not have to be upgraded.
Since the code change new dryer outlets must be wired with separate neutral and ground wires.
Remove the 3 wire dryer cord and install the replacement 4 wire dryer cord. Next where the wires are connected to the electric dryer you will need to remove the bonding jumper which goes between the frame grounded screw and the neutral terminal as shown in the 3 wire hook up wiring diagram below. The 3 wire connection is now outdated where current dryers are wired with a 4 wire cable. The older 3p 3 wire dryer circuits are still legal and safe to use so there s no need to rewire your dryer branch circuit to install a new dryer that came equipped with a 4 wire appliance whip wire.