Power-Through Switches. With power-through wiring, power enters the switch box directly. The feed wire (the hot wire coming from the service panel) runs to the switch before it goes to the fixture.

Next, refer to the switch-wiring photo you took earlier to connect the existing wires to the new switch. Here’s how a single-pole switch is typically wired: The electrical box usually has two ...

NOTE: Your junction box may have a third wire, known as the ground wire. It’s always green or copper colored. If you do have this wire, Donnelly says to attach it to the green screw, which will ...