This method might be used when power is available in the ceiling but switch boxes are on opposite walls it is often easier to run the cable up into the ceiling light box instead of between switches. Wiring diagram for a 3 way switch one of the many wiring diagrams showing different methods of wiring a three way switch circuit.
The switches will be identified by a label on the common terminal and or the terminal screw will be a different color.
3 way light wiring diagram. Make sure to wrap black electrical tape around the ends of all white wires used as travelers between the. By doing it yourself you can also save a lot of money and make a significant improvement to your home. The location of this common terminal may vary according to the manufacturer of the switch.
Three way switches are used any time two switches are needed to control a light. 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. October 2 2010 by the internet electrician.
This might seem intimidating but it does not have to be. In wiring three way switches the power wire is connected to the common terminal usually marked com. 3 way switch wiring diagram variation 3.
This presentation shows the internal workings of three ways and how a light can be controlled from two different. 3 way switch wiring diagram. Connect the wires to the new three way switches with ground screws using one of the two wiring diagrams fig.
The 3 wire cable consist of a black wire a white wire and a bare copper wire while the 4 wire. In this diagram the source for the circuit is at the light fixture and the two switches come after. 3 way switch wiring with light first.
Two wire cable runs from the light to sw1 and 3 wire cable runs between sw1 and sw2. In this 3 way switch wiring diagram the power in line enters the light box but 3 rope cables are then installed between the light box and each switch box. 3 way switch wiring diagram line to light fixtureline voltage enters the light fixture outlet box.
With these diagrams below it will take the guess work out of wiring. Take a closer look at a 3 way switch wiring diagram. 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.
If not marked the common terminal may be color coded black or brass. No longer allowed after 2011 nec if no neutral wire in switch boxes 3 way switch wiring diagram light fixture between switchesline voltage enters the first 3 way switch outlet box light fixture is located between switch boxes no longer allowed after 2011 nec if no neutral wire in switch boxes. This electrical wiring diagram shows power into light switch box 1 wire to light from switch box 1 and from switch.
In the following illustrations track each wire with a finger. How to wire a 3 way switch and connect two 3 way switches to an existing or new light fixture is one of those diy projects a homeowner can tackle on their own. Pick the diagram that is most like the scenario you are in and see if you can wire your switch.