A double-switch allows you to operate two lights or appliances from the same location. Double switches, sometimes called "double pole," allow you to separately control the power being sent to multiple places from the same switch. For example, you might want to turn on a bathroom light separately from the ceiling fan. To wire a double switch, you'll need to cut the power, remove the old switch, then feed and connect the wires into the double switch fixture.
How to Install a Double Pole Switch
How to Wire a Double Switch (with Pictures) - wikiHow
It isn't unusual to wire two or more light and switch combinations from the same power source -- in fact, it's common practice. Typically, the source is a circuit breaker in the main electrical panel that has a rating large enough to handle the lights. It's possible to mount the switches in the same or in different electrical boxes, but the latter case involves the extra task of running a circuit cable between the boxes. You maintain the continuity of the hot wire in the circuit cable by forming pigtails at the points where it connects to the switches.
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Join , subscribers and get a daily digest of news, geek trivia, and our feature articles. The switch can control your lights, the switch can control the outlet, or the switch can control both your lights and the outlet. For example: say your countertop appliances are hogging all of the outlets in your kitchen.