3 Wire Control Circuit Applications January 5, 2019 What is an RTD . Learn about resistance temperature detectors (RTD) components, and types. Including 2, 3, or 4 wire RTDs and their uses. www.jms-se.comTwo Wire Inductive Proximity Sensors: The Universal Donor. www.cgco.com House Light WiringBrass Light Switch DimmerConnecting Ac To FurnaceAc Electrical DiagramTork Time Clock Wiring DiagramWiring 110v Light SwitchElectric Outlet Switch4 Wire Electrical Connectors