How to Replace a Single-Pole Combination Light Switch

Replacing a light switch is a handy skill for any DIY homeowner to learn. A single-pole combination light switch is a multi-function device that fits in a standard wall box and

typically combines one or more single-pole switches (or a switch with another component such as a receptacle or USB port).

The most common version is a dual single-pole combination switch—two independent single-pole switches side-by-side that share a common power feed but control separate lights, a light and a fan, or similar loads. Each switch operates from one location only (unlike three-way switches). These types of switches save space and reduce the number of wall boxes needed. Replacement is similar to a standard single-pole switch but involves more terminals and wires.

Warning: Electrical work carries risks of shock, fire or injury. Always turn off power at the breaker and verify it is disconnected. If the wiring is complex, damaged, aluminum, or you feel unsure, then hire a licensed electrician. Local codes may restrict DIY electrical work.

Step by Step

Step 1

Turn off the power. Go to your electrical panel and switch off the breaker that controls the

combination switch. Confirm by trying the switches—they should do nothing. If breakers are unlabeled, turn the lights on and flip breakers until they go out (or shut off the main breaker).

Step 2

Unscrew and remove the faceplate. Insert the non-contact voltage tester into the box near every screw terminal and exposed wire. There should be no indication of voltage. If the tester activates, return to the panel and shut off the correct breaker.

Step 3

Remove the old combination switch. Unscrew the two mounting screws that hold the device to the electrical box. Gently pull the entire combination unit out of the box, taking care not to damage the wires.

• 

• 

Step 4

Photograph the wiring from several angles. These photos will be your primary reference for reconnection.

Step 5

Disconnect and identify the wires. A typical dual single-pole combination switch has one or more common/line (hot feed) terminals, separate load terminals for each switch, plus a green grounding screw.

Step 6

Loosen the terminal screws (or release push-in connections with a small screwdriver) and carefully remove each wire.

Note: Neutral wires usually pass through the box and are not connected to a basic single-pole combination switch unless the device includes a receptacle or other component that requires a neutral. Leave neutral bundles alone unless they were originally connected to the old device.

Step 7

Make sure the new switch matches the original configuration, amperage and voltage rating.

Step 8

Straighten any loops. Use wire strippers to clean and strip about 3/4 to 1 inch of insulation to expose fresh copper.

Step 9

To install the new combination switch, connect the bare copper or green ground wire(s) to the green grounding screw first. Use needle-nose pliers to shape a loop and tighten it securely around the screw. Use a pigtail and wire nut if multiple grounds are present.

Step 10

Attach the common/line (hot feed) wire to the appropriate common or line terminal(s),

replacing the connections according to the reference photo. Connect each load wire to its

corresponding switch terminal (brass-colored screws). Form clockwise “C” or “J” hooks with

the wire, so it tightens under the screw head as you turn it.

Tighten all the screws firmly but avoid over-tightening. (We prefer screw terminals over push-in connections for better long-term reliability.)

Cut away any excess exposed wire around the terminals. Double-check that no bare wires are touching each other or the box.

If the new switch has a breakable tab between terminals and your original setup shared a single feed, leave the tab intact or follow the manufacturer’s instructions and your photo.

Step 11

Install the new switch Carefully fold the wires back into the box

so nothing is pinched. Align the combination switch and secure it with the mounting screws (do not over-tighten).

Step 12

Reinstall the cover plate. Return to the breaker panel and turn the circuit back on. Test each switch independently to confirm it controls the correct light or device. Check for any heat, buzzing, sparking or unusual behavior—if present, shut off power immediately and recheck connections (or call a professional).

When to Call a Pro

Seek help if the wiring appears burned, brittle or nonstandard; if there is aluminum wiring; if the box is damaged or overcrowded; if the combination includes complex features (dimmers, smart functions, or multi-way switching); or if local regulations require licensed work. Proper grounding and secure connections are critical for safety.

Tools and Materials

• New single-pole combination switch that matches the original configuration, amperage (usually 15A or 20A), and voltage rating

• Screwdrivers (Phillips and flat-head; insulated preferred)

• Non-contact voltage tester

• Wire strippers and needle-nose pliers

• Electrical tape

• Flashlight

• Optional: gloves, safety glasses, wire nuts, and a matching cover plate

Electrical Safety Precautions

• Never rely on the wall switch alone, because power can still be present in the box. Turn off the correct circuit breaker and tag or cover it so no one restores power while you work on the circuit.

• Test every terminal and wire with a non-contact voltage tester before touching anything. Confirm the tester works on a known live source first.

• Match the replacement device exactly (number of switches,

terminals, and ratings). Do not force a different type into the box.