How to Install a Breaker Box in a Detached Garage | Hunker Begin the job by turning off the main breaker in the main panel. Feed the end of the wire going to the garage into the panel. Use wire strippers to remove about a foot of the insulation on the outside of the wire. Continue by removing one inch of the outer coating from the ends of each of the wires inside. How to Install a Breaker Box in a Detached Garage A breaker box in a detached garage is usually a sub-panel to the main circuit panel in the home. The advantage of installing a breaker panel in the garage is that it allows you to have multiple circuits available while only needing to run one line to the garage from the house.
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