3 Way Switch Circuits Variations. Click on it to enlarge it. NOTE: This is a thumbnail diagram.
Typically used for hallways and staircases, three-way switches are used in instances where two separate switches control one. Stew-Mac stopped selling it some months ago. However, intimate knowledge of circuit design is not really necessary for There are also four-way, five-way, and a gazillion-way circuits!
Three-way and four-way switches make it possible to control a light from multiple locations, such as the top and bottom of a stairway, either end These switches appear externally similar to single pole, single throw (SPST) switches, but have extra connections which allow a circuit to be controlled from.
The diagram below will give you a better understanding how this circuit is wired.
Find this Pin and more on Basement Ideas by Chris Godwin. The three-way switch is a variation of the standard single-pole switch, which controls a light only from one location. The most likely cause of circuit failure is an error in the wiring arrangement.