How to Install a Garage Electrical Subpanel

Power is the backbone of any functional workshop, and a dedicated subpanel is the only way to ensure your garage handles heavy tools and lighting without tripping the main house circuits. When done correctly, this setup provides a clean, organized, and scalable power hub that keeps your equipment running smoothly and safely. Success in this project hinges on strict adherence to the electrical code regarding wire gauge, conduit type, and grounding. A well-installed subpanel should feel like a permanent extension of your home's electrical system, offering enough headroom for future needs while keeping your workspace safe from overloads.

1. Size for Today and Tomorrow. Determine your amperage needs based on the tools you plan to run. Purchase a panel with enough circuits for your current needs plus at least 30% room for future growth.
2. Anchor the Panel Square. Select a location on a wall stud near your workspace but away from potential water sources. Screw the panel enclosure securely to the studs using code-approved mounting hardware.
3. Route the Supply Safely. Install electrical metallic tubing or rigid conduit from your main service panel to the garage subpanel location. Use appropriate fittings to ensure the conduit is continuous and grounded.
4. Connect at the Source. Turn off the main house power before opening the main service panel. Install a double-pole breaker and connect your hot, neutral, and ground wires to their respective terminals.
5. Isolate and Distribute Power. Feed your wires into the subpanel and secure them with cable clamps. Connect the hots to the main lugs, the neutral to the isolated neutral bar, and the ground to the grounding bar.
6. Organize for the Future. Run your individual circuit cables to outlets and lights throughout the garage. Connect the black wires to your new breakers and the white and bare wires to the neutral and ground bars respectively.