They must be attached to the structure and not mounted to drywall. Indoor sub-panels are usually mounted between 2 x 4 studs and are not weathertight. Always check the product rating to make sure you’re using the correct wires. For a six-space panel used indoors, a 100-amp wire size is needed, while a two-space outdoor panel can work with a 60, 100, or 200-amp wire. And make sure to use insulated electrical tools to avoid injury. Nonmetallic flexible cables must be used to carry ground wire, while an armored steel cable can be used as a grounded connection. Here are the appropriate sizes/amp ratings:Īlways use copper for a ground wire (and never as a neutral wire). Only 600-volt copper wire should be used. Tools you’ll need for installation include a screwdriver, hammer, voltage tester, flashlight, wire strippers, lineman’s pliers, and long-nose pliers.įor materials, you’ll need the sub-panel, mounting screws, a feeder cable approved for the application, staples or cable clamps, circuit breakers, and an approved feeder breaker. Grounds and neutrals can only be connected to the main panel. There is no main breaker here and the sub-panel must have separate bus bars for neutral and ground wires. The main panel’s feeder breaker works as the main disconnect for the subunit. It’s also beneficial if your existing electrical panel doesn’t have room for new breakers. This component is suited for homes that can’t accommodate tandem circuit breakers, which allow two circuits to be controlled from one slot. However, we’ll explain the basics of sub-panel installation to help you understand what it involves. It’s best to hire an electrical contractor, as this project entails working with wiring and other high-voltage electrical components. To connect the two panels, you’ll need a thick three-wire cable. You might need a sub-panel if there aren’t enough circuit breakers in your main electrical service panel.
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