Wiring A 4 Way Light Switch Diagram. The white wire becomes the energized switch leg as indicated by using black or red electrical tape. 4 way switch wiring diagrams national electrical code.
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. Rear view of an old four way switch with copper screw terminals on one side and brass screw terminals on.
This diagram is a thumbnail.
This 4 way switch diagram 2 shows the power source starting at the fixture. In the diagrams below the first switch 3 way common terminal connects to line voltage. A 4 way switch wiring diagram is the clearest and easiest way to wire that pesky 4 way switch. Wiring a three way switch circuit is one of the more complex electrical jobs that a homeowner can attempt.
