Remove the knockout panels that line up with the new breaker on the faceplate of your circuit box. Wrap the ends of the white and green wires around separate screws on the grounding bar in your circuit box and secure them in place by tightening the screws.
#WIRING A 30 AMP BREAKER INSTALL#
Install a 30-amp double-pole breaker on the circuit, then push the ends of the red and black wires into the ports on the breaker. Attach a cable clamp to the hole and thread the wires through it. Remove the front panel from the circuit box and punch out the pre-cut knockout on the side of the box. Strip the outer coating off of the last 1-2 feet (30-61 cm) of the end of the cable that will attach to the circuit box, then strip ½ inch (1.3 cm) of insulation off of the ends of each of the wires. Smaller capacities apply to aluminum wire and for. BMitchs table of values is only for copper wiring for lengths up to 80100 feet (2530 m). That is, a 50 amp breaker cannot be used on a wire rated for 30 amperes: doing so would allow the wire to overheat leading to a house fire. Push the wires and outlet into the outlet box and secure them in place with screws, then screw on the outlet faceplate. The breaker for the circuit cannot exceed the wire rating. Secure the black and red wires into the two unlabeled slots. Feed the end of the white wire into the slot with the neutral screw on the back of the outlet, and the green wire into the slot with the ground screw. Use a wire stripper to remove 1 foot (30 cm) of the coating on the outside of the cable to expose the wires inside, then strip ½ inch (1.3 cm) of the insulation off the end of each wire. Push the outlet box into the hole and screw it in securely, then pull about 1 foot (30 cm) of the cable out through the hole in the box.
Use a fish tape to thread the cable through the wall between the hole you made for the outlet box and the hole you made near the circuit breaker. Run a rigid metal electrical conduit from the side of the breaker box to the hole you drilled and attach it to the wall with conduit straps every 1-2 feet (30-61 cm). Drill a hole in the wall near the circuit breaker box that’s about 1 inch (2.5 cm) wider than the diameter of the cable. Measure the shortest route between the outlet box and your circuit breaker, then cut a 10/4 cable so that it’s 2-3 feet (61-91 cm) longer than the distance you measured. Next, use a drywall saw to cut out a hole in the right size and shape for the outlet box you want to install. To wire a 220V outlet, first switch off power at the main circuit breaker.
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