Three Way Switch Definition March 4, 2019 Understanding Three. Three-way wall switches control a light fixture from two locations in a room. They are always installed in pairs and use special wiring connections. www.thespruce.com Industrial Electrical Wiring Diagram SymbolsMotorguide Wiring Diagram230v Relay Wiring DiagramSwitch Wiring Schematic110 220v Motor Wiring DiagramHunter Ceiling Fan Wire Color CodeHow To Wire Sockets In Series2 Way Relay Switch