3 Way Wall Switch May 28, 2019 Understanding Three. Three-way wall switches are most commonly used to control a light fixture from two locations, such as from both ends of a hallway or stairway. www.thespruce.com Wire Types Chart3 Wire Dryer OutletNissan Radio Wiring Diagram2080 Of2 Wiring DiagramWiring Diagram RelayConnecting Lights In Series5 Pin Flat Trailer ConnectorToro Lx425 Wiring Diagram