Three Way Connection Lights. Three-way light switches control a light from two locations, such as from both ends of a staircase or hallway. Let's start by looking at how a normal light is wired so that you can understand basic residential wiring for a light switch.
How Three-Way Switches Work. by Marshall Brain. The green screw at one end is for the ground wire. The figure below shows the simplest possible configuration I moved a three way switch and (stupidly) did not take a picture of the original installation.
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In this article we're going to be looking at three way switches for lighting circuits in north America.
Always remember two way switch will have three terminals. Three-way light switches control a light from two locations, such as from both ends of a staircase or hallway. The methods shown here are some of the safest and most versatile, though not the only options.