Wiring Overview: Familiarize yourself with the 2-way switch terminals: common (C), L1, and L2. First Switch Connection: Connect the live wire to the common terminal, and use a 3-core cable to connect L1 and L2 to the second switch. Run Cable: Extend the 3-core cable from the first to the second switch.. When wiring a 2-way switch circuit, all we want to do is to control the black wire (hot wire) to turn on and off the load. This simple diagram below will give you a better understanding of what this circuit is accomplishing.
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A simple theory on how a 2 Way Switch works. Two types of wiring viz., Two Wire Control and Three Wire Control are explained.. When it comes to home electrical wiring, one of the most commonly used and versatile devices is the 2 way switch. This simple yet powerful device allows you to control a light or any other electrical fixture from two different locations.