Four Way Switch Circuit Diagram. Click here to access note. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wirenut.
For complete instructions on wiring a basic 4 way switch see our wiring a 4 way switch article. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wirenut. 4 way switch wiring diagrams national electrical code.
Keep in mind that each light switch will count as two wires when calculating your box fill.
Rear view of an old four way switch with copper screw terminals on one side and brass screw terminals on. In the third box black and red are travelers with white going to the common. This diagram illustrates wiring for a 4 way circuit with the electrical source at the light fixture and the switches coming after. Click here to access note.
