Ground connection diagram is shown separately. Electrical outlet boxes can have numerous NM cables going in and out. The common terminal of the second 3- way switch supplies line voltage switched from the second 3- way switch through the switch boxes and back to the light fixtures using the NM white wire with black tape on each end.ĭiagrams shown on this page are simplified for clarity. The traveler wires are interchangeable on each switch. Three-way wire(which includes red, black and white wires) runs from the switch on the left to the switch on the right, with the white wire carrying ground and. A 3- wire NM connects the traveler terminals of the last 4- way switch and the second 3- way switch. Here 3-wire cable runs between L1 and L2, 2-wire cable runs from the last. More lights can be added to this circuit by duplicating the wiring shown here for each additional fixture. Step 1: Turn off power Step 2: Install boxes and run cables Step 3: Wire first switch Step 4: Wire second switch Step 5: Wire lights Most household light switches are of the single-pole variety that only allow you to operate your lights from a single location. For more than two switches, one or more 4-way switches are added between the 3-way switches. A 3- wire NM connects the traveler terminals of the first 4- way switch and the second 4- way switch, and so on. This drawing shows the wiring for multiple lights in a 4 way switch circuit with the source and fixtures coming before the switches. These wires should have black tape on both ends to indicate line instead of neutral.Ī 3- wire NM connects the traveler terminals of the first 3- way switch and the first 4- way switch. The white wire (line switched) connects the white wires of sequential NM traveler cables together and eventually connects to the common terminal of the second 3- way switch. A 3-way circuit is a lighting circuit that allows one light fixture to be controlled by two wall switches in different locations. The black wire connects to the common terminal of the first 3- way switch. This neutral wire terminates at the last light fixture box and does not travel through any switch boxes.Ī 2- wire NM connects the last light fixture box to the first 3- way switch box. The neutral (white) wire connects to the light fixture(s) and the white wire(s) of the NM cable(s) that connect between the light fixture boxes. Have another person stand at one switch, while you stand at the other. The line (black) wire eventually connects to the common terminal of the first 3- way switch. Wrap the terminals in electrical tape, and put the switch back in the wall box. In the diagram below, a 2- wire NM cable supplies line voltage and neutral from the panel to the first light fixture box on the left. This wiring configuration is no longer allowed as of the 2011 NEC if a neutral wire is not present in the switch boxes. Power enters the first light fixture box instead of the first 3- way switch box. A 4- way switch wiring option is fairly complex. I want to replace a 3-way switch for a bathroom fan, but the switch has 4 wires going into the back of it ( and 4 connectors ), but my standard 3-way switch I'm replacing it with only has 3 spots for wires.
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