How to Wire a Garage (Unfinished) - familyhandyman In a house or a finished garage, electrical cable is protected from damage by permanent wallcoverings like drywall, plaster or even wood, but that’s not the case in an unfinished garage. The key to safe, code-compliant exposed wiring is to use the framing members to protect and support the wires.Author: The Family Handyman Garage Electrical Wiring - home-garage-help Knowing what you need will help you avoid over-wiring your garage, yet keep you from under-wiring your garage. Do you need 240 volts in your garage (US)? In the US, electrical house wiring is fed by 120 volts. However, by picking up the second hot leg in your panel, your garage electrical wiring can deliver 240 volts. Why bother?