A 3 way switch has three screws plus the green grounding screw. 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.
October 2 2010 by the internet electrician.
3 way electrical wiring diagram. The most important screw is the black one 3 way switch diagram tips. This electrical wiring diagram shows power into light switch box 1 wire to light from switch box 1 and from switch. The travelers actually pass the electricity between the two 3 way switches as well as the 4 way switches shown in the 4 way switching wiring diagrams.
Traveler wires go on the brass screws. These switches do not have an on off position like single pole switches. It is true that there are several wiring configurations for wiring 3 way light switches and all of the wiring configurations will depend on where the incoming circuit power is located and once that is identified the rest of the three way wiring connections are straight forward.
Watch all videos below for easy steps. Continuous hot and light feed wire goes on black screw. 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.
14 3 with ground or 12 3 with ground wire best to use between switches. 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. Unfortunately not all 3 way switches are wired.
3 way switches are used to control lights with two switches. 3 way switch diagrams for multiple light fixtures. 3 way switch wiring diagram line to light fixtureline voltage enters the light fixture outlet box.
The diagrams below show the conventional wiring for 3 way switches. This is the most common and the easiest wiring diagram to follow of any of the wiring diagrams for a 3 way switch circuit. 3 way switch wiring diagram variation 3.
It is important to understand how these are wired before attempting to troubleshoot or replace. Wiring diagram for a 3 way switch one of the many wiring diagrams showing different methods of wiring a three way switch circuit. To illustrate the wiring of these 3 way switches switch boxes and fixture boxes are not shown but are obviously required for every application.
This wire diagram shows the wiring for source power into the first three way switch then 3 wire cable to the next 3 way light switch and then on to the light or light fixtures.