Regardless of what 3 way switch wiring diagram. 3 way switches are useful for large rooms with multiple entrances but require a bit more wiring than a standard single pole switch.

3 Way Switch Installation Circuit Style 3
Wiring up a 3 way switch. Fixture between two three way switches. With these diagrams below it will take the guess work out of wiring. First run a 2 wire cable from the wall power to the black screw on 1 of the switches. 12 is a heavier gauge can handle up to 20 amps and usually has a yellow sheath. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. The black line wire connects to the common terminal of the first 3 way switch.
14 has a white sheath and is good for up to 15 amps this is what you find with 14 3 or 12 3 in either case. Take a closer look at a 3 way switch wiring diagram. Wiring a 3 way light switch. This might seem intimidating but it does not have to be. In the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box. To wire a 3 way light switch youll need 2 3 way light switches 2 2 wire non metallic cables 1 3 wire non metallic cable and 2 6 inch grounding wires.
Traveler wires are interchangeable. Today we give you the tools knowledge to remove and install a 3 way light switch without electrocuting yourself. A 3 way switch allows you to turn a light on or off from two different switches. 14 3 or 12 3 the romex cable actually has 4 wires. Wiring a double switch duration. The ground wire is pigtailed with a wire connector at the switch boxes and the ceiling box.
With a pair of 3 way switches either can make or break the connection that completes the circuit to the light. Typical 3 way switch wiring nm cable. Power through switch light is controlled by two three way switches with the light between the switches and the power first going through a switch then to the light and onto the second three way switch. The wiring method will. Up next how to fix a 3 way. 3 way switch wiring diagram.
The 14 or 12 is the wire size. Wiring a 3 way light switch is certainly more complicated than that of the more common single pole switch but you can figure it out if you follow our 3 way switch wiring diagram. A 3 wire nm connects the traveler terminals of the first and second 3 way switch together.