Electrical 4 Way Switch Wiring Diagram. Click here to access note. Rear view of an old four way switch with copper screw terminals on one side and brass screw terminals on.
I have a few of the most common ways in wiring a 4 way switch to help you with your basic home wiring projects. 4 way switch wiring diagrams national electrical code. The white wire becomes the energized switch leg as indicated by using black or red electrical tape.
Keep in mind that each light switch will count as two wires when calculating your box fill.
In the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box. A 3 wire nm connects the traveler terminals of the first 3 way switch and the first 4 way switch. The black line wire connects to the common terminal of the first 3 way switch. In the diagrams below the first switch 3 way common terminal connects to line voltage.
