To wire a breaker box, attach the grounding wire to the metal bar with setscrews, remove 1/2 inch of insulation from the wires, insert them into the circuit breaker, and push on the circuit breaker to lock it into place. Before working on a breaker panel, turn the power off.Continue Reading
Flip the main breaker switch, which is the largest switch, to the off position.
Place the grounding wire into an open terminal on the grounding bus bar, and tighten the setscrews. The grounding wire is the bare, copper-colored one. If the breaker box does not have a specific spot for the grounding wire, insert it into the neutral bus bar, which is the metal bar with setscrews that runs around the breakers.
Using a wire stripper, remove 1/2 inch of insulation from the white wire. Insert the end of the wire into an open terminal on the neutral bus bar, and tighten the setscrew to keep it in place.
Remove 1/2 inch of insulation from the black wire, and do the same to the red wire, if you have one. Insert the black wire into the terminal on the circuit breaker, and install the red wire into the second terminal.
To lock the circuit breaker into place, slide the end with the hot wire under the tab for the hot bus bar, which runs down the center of the panel, and push the other end toward the neutral bus bar.
Knock out the hole for the new breaker switch, and screw the cover back on. Turn off all the breakers before restoring power.