How to Wire a Garage for 220 Volt Power

Most garages use the same 120-volts AC power found in the home. The power needs of a garage can grow depending on what the garage will be used for. If all you will need the garage for is protecting your car, then you may not need a 220-volt line to the garage. However, if you are planning a workshop or will be using high-power tools that require 220-volts, you will need to wire a 220-volt line to the garage.

Things You'll Need

  • Double pole double throw breaker
  • 10-3 or 8-3 wire depending on what will be powered
  • 220-Volt socket.
  • Wire cutters
  • Wire strippers
  • Screwdriver

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Take one end of the 10-3 or 8-3 wire and strip 1/2 of an inch of insulation off of the red, black, and white wires. Connect the red wire and the black wire to the two bronze terminal connections inside the socket. Then connect the white wire to the common wire terminal and finally, the ground wire to the ground terminal. Cover the receptacle and mount the 220 volt receptacle box on or in the wall.

Run the other end of the wire back to the main power panel. Make sure you secure the wire along its path back to the power panel.

Shut off the power at the main power panel and remove the breaker cover screws and remove the breaker cover. Pick two adjoining slots to place the new double breaker in. Knock out those two slots in the main power panel breaker cover.

Strip 1/2 of an inch of insulation off of the red, black, and white wires. Connect the white wire and the ground wire to the common bus bar which is usually located to the left and right of the two center power bars. Connect them by using a screwdriver to loosen one of the screws enough so that the bare metal ends of the wire can be inserted through the holes underneath the screws. Then tighten the screws.

Take the red and black wires and insert each wire into a seperate screw terminal on the double pole circuit breaker. Tighten both terminals and plug the breaker into the chosen breaker slots in the power panel. Replace the breaker cover and screws and turn the power back on.

Tips & Warnings

  • Use caution when working in a power panel. It is very dangerous to work in.
  • Know what parts of a power panel have electricity at all times. Do not touch those parts.


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