Wiring A 4 Way Switch Diagram. A 3 wire nm connects the traveler terminals of the last 4 way switch and the second 3 way switch. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wirenut.
Two wire cable is run from the light to sw1 and 3 wire cable runs between the three switches. This diagram illustrates wiring for a 4 way circuit with the electrical source at the light fixture and the switches coming after. The other pair of the second switch 4 way travelers connect to one pair of the third switch 4 way travelers.
When you employ your finger or even stick to the circuit with your eyes it is easy to mistrace the circuit.
A 3 wire nm connects the traveler terminals of the last 4 way switch and the second 3 way switch. A 3 wire nm connects the traveler terminals of the first 4 way switch and the second 4 way switch and so on. A 4 way switch wiring diagram is the clearest and easiest way to wire that pesky 4 way switch. The 4 way is used when you want to control the light or lights from two or more locations.
