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Each 3-way switch in these examples are controlling the power source to the same load. When wiring a 3-way switch circuit, we will be using a 3-wire cable known as romex coming from the source (such as the breaker box). Then a 4-wire cable going between the two 3-way switches and then a 3-wire cable going from the switches to the load. The switch is rated up to 10amp at 125v although I'll be using it for 12/24v DC. I don't have a wiring diagram but I believe the video shows things clearly enough. At the 3 way switch, the white cable wire is marked black and connected to the common terminal. At the other end, the white wire is marked black again and spliced to the black wire running the hot terminal on the light. The black and red wires running between the switches connect the travelers together. This first step will eventually send power directly to the Light fixture. B) Connect the Black (hot) wire (coming from the Romex cable that leads to your circuit panel) to your New 3-way light switch (#1) – you will connect the hot wire to the hot terminal on the 3-way switch, which is usually Black and stands alone. Take a closer look at a 3 way switch wiring diagram. Pick the diagram that is most like the scenario you are in and see if you can wire your switch! This might seem intimidating, but it does not have to be. With these diagrams below it will take the guess work out of wiring. Interested in a 4 Way Switch Wiring Diagram. Option 3. Fixture Between Two Three-Way Switches 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 ground wire is pigtailed with a wire connector at the switch boxes and the ceiling box. 12 Volt 3 Way Switch Wiring Diagram – 12 volt 3 way switch wiring diagram, Every electric structure consists of various diverse components. Each part should be set and connected with other parts in particular manner. Otherwise, the structure will not work as it ought to be. How to Wire a Three-Way Electrical 12-volt Switch by Phil Altshuler . Three-way low-voltage switches are available in several different varieties. There are rocker, toggle and push-pull styles, and they come in a large number of colors and designs. These switches are in automobiles, boats and recreational vehicles. Directions for Wiring a 3-Way Light Switch Yourself Turn off the correct circuit at your electrical panel. Add an electrical box for the second three-way switch in the basement. It’s likely you’ll also need to replace the existing switch box with a Feed a length of 14-3 type NM cable (or 12-3. In the 1st diagram below, a 2-wire NM cable supplies power from the panel to the first switch box. The black (line) wire connects to the common terminal of the first 3-way switch. A 3-wire NM connects the traveler terminals of the first and second 3-way switch together. Traveler wires are interchangeable on each switch.