Four Way Switch Connection Diagram. 4 way switches have four terminals each with two pairs of travelers one set usually black and one set usually brass color. A 4 way switch must be wired between two 3 way switches as shown in the diagrams on this page.
Rear view of an old four way switch with copper screw terminals on one side and brass screw terminals on. 4 way switch wiring diagrams national electrical code. In the diagrams below the first switch 3 way common terminal connects to line voltage.
Conventional 4 way switch wiring.
A four switch configuration will have two 3 way switches one on each end and two 4 way switches in the middle. To view it at full size click on the diagram. The white neutral splices to the white to the light. Click here to access note.
