This second drawing: How to Wire a Three Way Switch Power to Switch shows the wiring for a three way switch when the power source enters one of the three way switch boxes. Review the diagram below for basic three-way. The first drawing shows the wiring of a three way switch with the power source entering the light box. The main wire that will go from one switch to the other should have 4 wires total (black, white, ground and red).
The other terminals usually have brass screws. This common terminal usually has a red, copper or black screw and the word COMMON stamped on the back of the switch. The black wire from the power source is shown connected to the three-way switch at the common terminal of both switches. The white wire connected to the three-way switch is colored black to show it is not a neutral wire. Notice in both diagrams that the black wire is used for switching purposes in combination with the red and white wires. Whenever an electrician uses a white wire as a hot wire, he/she will put black tape or colorant on it to distinguish it as a hot wire, rather than a neutral. 3-Way Switch Wiring Diagram 3-Way Switch (Light Between Switches) Below Ive shown two variations of wiring a light between 3-way switches. On the 3-way switch, the white wire is used as an extra switch wire and is said to be colored black. You'll notice that in both diagrams, the white or neutral wire goes through the switch boxes and connects to the light - it is not switched. The trick with wiring switches is that you only switch the black or hot wire.
For example, turning the light on or off from the top of the stairs and turning it off or on at the bottom of the stairs. The S2 smart switches are perfect for that use and feature a patented solution that makes multi-way wiring fast and easy. VERY IMPORTANT! Before working on any electrical modifications of your home read the first article in this series: Electrical 1: Electrical Safety.Ī three-way switch is used for turning one or more lights on or off from two different places.
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