Installing Light Switch 2 Wires December 16, 2018 APNT. This application note explains the difference between 2-wire and 3-wire lighting systems and helps you understand which version you have in your installation. www.vesternet.comElectrical . diy.stackexchange.com Amp Wire Diagram3 Way Intermediate Switch4 Prong 240v PlugTriton Trailer Wiring DiagramSingle Outlet SwitchRoller Shutter Switch Wiring DiagramHow To Hook Up Thermostat To FurnaceHow To Wire Outdoor Lights To A Switch