Turn off the power to the light circuit at the main panel. The two hot wires of three-wire cable connect to a pair of brass-colored traveler terminals on each switch. Before jumping straight into the feature specific table, let’s go through some useful information. A three-way wall switch is a common type of light switch that makes it possible to control a ceiling light or other electrical fixture from two different locations in a room. A two-way switch works differently from the one-way switch. I really would like to see a diagram of it where the dimmer will be on the end of the circuit. Applications of Two Way Switch:. There's a problem loading this menu right now. So, what is a 2 way switch? When you control a light in two separate switches, you actually have a three-way switch. This switch body does have two isolated negative inputs (T9 and T7) for each lamp or LED in the switch. Now, let’s look at the 3 way switch. Unscrew the two-way switch, disconnect the wiring, and pull it out. Using a common terminal and a selector to reroute the signal of a circuit, the two-way switch can be found in almost all electrical applications. I want to know if its possible to put two dimmer switches on one light. 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