3 Way Switches Explained - How to wire 3 way light switchNotice that there is a 3-conductor cable coming into the first box, then a 4-conductor cable going from left box to right box, then a 3-conductor cable going from the right box to the load. Now for wiring, lets assume you're looking at the switch just like it shows. The Left Box: The lower left screw is the common and gets the black wire from the source 3-cond. The upper left screw gets the black wire from the right box 4-cond. The upper right screw gets the red wire from the right box 4-cond.
The first thing you will need to determine is where the power is coming from and where the switches are positioned.
3 Way Switch Wiring Diagram
In this first example, the power is coming in to the first switch, flowing along to the second switch and ends at the light. The ground wire will always be attached in each box and flow right to the end fixture.
With a pair of 3-way switches, either switch can make or break the connection that completes the circuit to the light. The whole wiring a light switch project can be. Looking for a 3 way switch wiring diagram? Here are a few that may be of interest .
This option is very similar to option 1 when wiring a 3 way switch. Here I am showing how to hook some lights up in series.
If you need more than two lights, just keep pig-tailing the white and black wires to keep the circuit going. A comment from a fellow handyman. Just that 3 way switches are a pain in the neck, especially when someone pre-wired but did no finish work, dry wall was installed and the electrician never came back, leaving this owner to hunt down every power leg and determine where every run went.
A phenomenal effort on your part! This may be one of the most common way to wire a 3 way switch.
Think of your staircase or hallway. Light switch at one end, lights in the middle, light switch at the other end.
Trace the wires carefully in the diagram so you can connect them to the proper locations. Similar to option 3 but with a series of lights in the middle of two 3 way switches. Note there are slight differences with the wiring at the light fixtures.
Be sure to mark the white wire as noted so if any future repairs or replacement is needed, whoever goes into the box will know it is marked as a hot wire. The white wire coming from the second or last light will be marked "hot" with black electrical tape.
This way, all the wires can be used with no waste.
Here is another example of wiring a 3 way switch with the power coming from the fixture. I is similar to Option 3 only with the power coming into the light fixture.
How do you hook up 3 way switches
There is no standard for wire colors on 3- way switch travelers. The colors will vary depending on whether NM cable or conduit was used. With NM cable, the wire colors for travelers will be black and red using 3- wire cable.
With conduit, the wire colors for travelers could be any color. In the 2nd diagram below, blue wires are used for travelers.
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.How to wire a 3-way switch system
The common terminal of the second 3- way switch connects to the light fixture s. The white neutral wires are connected together in each switch box.
Diagrams shown on this page are simplified for clarity. Electrical outlet boxes can have numerous NM cables going in and out. See Actual Switch Box Wiring.
Wiring a 3-way Switch, I Will Show You How To Wire A 3-Way Switch Circuit and Teach Be sure to attach a bare copper wire to the green screw on the switch. This option is very similar to option #1 when wiring a 3 way switch. Here I am showing how to hook some lights up in series. If you need more than two lights, just. Convert an existing two-way switch to a three-way switch and run new wire to the It covers running new electrical cable and connecting both switches, and.