Step 4 : Connect the wires
Check again to see that the electricity is "Off". To connect the wires the green (ground) wire is connected first, then the white (neutral) wire and then the black wires. The black wires should be connected next to each other to two 15 or 20 amp circuit breakers. The device functions best if all bends in the wire are rounded, then cut all leads to the correct length and do not coil excess lead.
Step 5 : Connect the green and white wires to ground bus bar
Route the green wire to the ground bus bar provided in the breaker panel. Some panels do not have a separate ground bus bar so the green wire must then be connected to the neutral bus bar. This wire must be connected for safety purposes. Next, route the white wire to the neutral bus bar provided in the breaker panel.
Step 6 : Connect the black wires to circuit breakers
The two black wires remaining must be connected to two separate 15 or 20 amp circuit breakers, not to each other, to insure connection across the full 240 volt AC incoming power circuit. Use a circuit tester or AC voltmeter across the black wire connection to be sure the device is providing full protection to your panel. No more than two wires should be connected to one circuit breaker so it may be necessary to add new breakers.
Step 7 : Fasten the device
Check to be sure all wires are securely fastened and all screws are tight. You can confirm that the device is wired to the correct breakers if you can read 220 or 240 volts AC between the two breakers that the device is connected to. Replace the front trim panel on the circuit breaker.
If there is no voltage between the two breakers, check to be sure that both of the breakers and the master breaker are "On". If there is still no voltage between the two breakers, then they are probably on the same leg, and you will have to select another breaker for one of the black wires. Be sure to turn off the main breaker before you attempt to move any wires.
Illustrations courtesy of Intermatic, Inc.
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