Four Way Switch Wiring Diagram. This 4 way switch diagram 1 shows the power source starting at the left 3 way switch. The black line wire connects to the common terminal of the first 3 way switch.
Rear view of an old four way switch with copper screw terminals on one side and brass screw terminals on. The 4 way is used when you want to control the light or lights from two or more locations. 4 way switch wiring diagrams national electrical code.
Basic 4 way switch wiring diagram.
Click here to access. The 4 way is used when you want to control the light or lights from two or more locations. Basic 4 way switch wiring diagram. Two wire cable is run from the light to sw1 and 3 wire cable runs between the three switches.
