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4 Way Switch Wiring Diagram for Controlling One Light from Three or More Locations

4 way switch wiring diagram

Install two three terminal control units at the ends of the lighting line and place a four terminal crossover device between them. This arrangement allows one lamp to be controlled from three or more positions such as staircases, corridors, or large rooms. The phase conductor enters the first control unit, travels through paired traveler conductors, passes the crossover device, and reaches the final control unit before feeding the lamp.