3 And 4 Way Switch Wiring Diagram. This 4 way switch diagram 2 shows the power source starting at the fixture. A 3 wire nm connects the traveler terminals of the first 4 way switch and the second 4 way switch and so on.
3 way switch wiring diagram depicting all wires in the ceiling junction box. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wirenut. Here 3 wire cable runs between l1 and l2 2 wire cable runs from the last light to sw1 and more 3 wire cable runs from sw1 to the 4 way switch and then to sw2.
At each switch in the above 3 way switch wiring diagram the black wire gets connected to the common copper or black screw.
A 3 wire nm connects the traveler terminals of the first 3 way switch and the first 4 way switch. Traveler wires are interchangeable on each switch. 4 way dimmer switch wiring diagram. In fact a dimmer can be used this way in place of any of the 3.
