Four Way Switch Wiring Diagrams One Light. The diagrams for 3-way switch wiring we broke down into the following sections see below. A 4 way switch wiring diagram is the clearest and easiest way to wire that pesky 4 way switch.
3 way switch wiring diagram. A two-wire cable C2 is run from the light to the first switch SW1 and a 3-wire cable runs between all the switches. How a 3-Way Switch Works.
The source power black wire is coming in from the left.
Its important to realize you must put the line wire on the single black screw on the one 3-way switch. With a pair of 3-way switches either can make or break the connection that completes the circuit to the light. Wire a Switched Outlet. In this diagram the source for the circuit is at the light fixture and the two switches come after.