4 Way Switch Diagram Power At Switch. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wirenut. 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.
This 4 way switch diagram 2 shows the power source starting at the fixture. A 4 way switch is a double pole double throw dpdt switch. Two of the terminals are brass and labeled input the other two are black and labeled output.
I have a standard circuit with a 3 way switch on each end and one 4 way switch in the middle.
A 4 way switch must be wired between two 3 way switches as shown in the diagrams on this page. 4 way switches can be quickly identified by the 4 screw terminals in addition to the green gnd screw terminal. 4 way light switch with power feed via the light. In the diagrams below the first switch 3 way common terminal connects to line voltage.
