How to Safely Wiring a Double Gang Box

How to Safely Wiring a Double Gang Box


Wiring a double gang box allows you to have two switches controlling two separate lights or outlets from one box. While this can be a useful way to consolidate controls, it's important to wire it properly for safety. In this guide, I'll walk you through the steps I take to safely wire a double gang box.

Gather Materials

Before starting any electrical project, it's essential to have the right materials on hand. Here's what you'll need to wire a double gang box:

Turn Off Power

Before touching any wires, use a voltage tester to confirm the power is OFF at the circuit breaker. Working on live wires can result in a serious shock hazard. Better to take a minute to flip the breaker than get injured.

Mount the Box

If this is a new install, start by mounting the double gang box between two wall studs. The box should be flush with the wall surface so switches mount properly. Secure box to studs with appropriate screws.

For existing boxes, remove old switches and disconnect all wires before installing the new double gang box. Mount the new box in the same spot as the old one.

Run and Connect the Wires

Here's how I wire a double gang box to control two separate lights:

Follow diagrams properly to know which wires splice together with LINE vs LOAD.

Install the Switches

With the wiring complete, install the switches into the box:

Testing and Use

Before closing up the wall, test that both switches work properly:

And that covers the basics of safely wiring a double gang box! Let me know if you have any other questions. Stay safe when working with household electrical.