This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. This article has been viewed 1, times. Learn more A 3-way light switch allows you to control a light source from two separate points. Note: there are several ways to install a 3 Way Light Switch.
Replace the covers for the switches, screw them into place, and turn the power back on to be in business. Part 3 of Select the proper wire size.
The Best 3 Way Switch Explanation Ever!
If originating from an electric panel or fuse box, 12 copper is the minimum size when connecting to a 20 amp circuit breaker or fuse; 14 copper is the minimum size when connecting to a 15 amp circuit breaker or fuse aluminum wire on circuits of these capacities has been prohibited for many years.
The size of all the wires in any circuit must be the same size.
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When obtaining power from a nearby electrical outlet or another circuit device, the new wiring must be the same size as those that supply the outlet. Select the proper cable type.
The power supply or feed cable should be "2 wire" or conductor cable plus a ground wire. See below for descriptions and uses of common cable types. Shut power off. This is a very important step.
Please do not skip it. Install a 2 wire cable between the power source outlet box, electric panel, etc and the first switch box. Leave inches Connect the ground wire to the circuit ground wire s with a wire nut or other approved connection see How to Connect Electrical Wire.
The ground wire should be connected to the neutral terminal bar.
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If equipped with a separate ground bar, rather than connecting to the neutral terminal bar, the ground wire can connect to the ground terminal bar. However, if all the existing ground wires connect to one bar and all the existing white wires connect to a different bar, maintaining separate ground and neutral connections is required.
Never introduce ground wire s to a terminal bar with only white or gray insulated wires connected or vice versa. If the power source is an electrical panel or fuse box, the cable should be cut at least long enough to reach the furthest termination point breaker or fuse, ground and neutral bar without the need of splicing. Install a 3 wire cable from the first switch box to the light fixture's box.
A 3 wire cable has an "extra" wire when compared to 2 wire cables, and this wire is nearly always covered in red insulation. This third wire is necessary for 3-way switch installations. Install a 3 wire cable from the second switch box to the light fixture's box.
Connect ground wires. If the switch or junction box is metal, it too must be securely grounded with a green ground screw or approved grounding clip.
Typical 3-Way Switch Wiring, NM Cable 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.
This must be done at each and every box that a cable enters and at each device that provides a termination point for ground. It is highly recommended that you complete these ground connections first, and then gently fold them into the rear of the box - out of the way - leaving only the shorter ground leads out for easy connection to devices. No ground connection is made to plastic, fiber or another non-conductive box. Connect feed wires in the first switch box. First, connect all ground wires as previously described.
The 2 wire cable feed from the power source enters the bottom of the switch box and the hot black wire connects to the common or shunt terminal on the 3-way switch. There is only one such terminal on a 3-way switch, and it is usually identified as the one having a different color terminal screw often significantly darker from the other two terminal screws not counting the green ground screw.
Connect the 3 wire cable's white insulated wire neutral directly to the 2 wire 'feed' white insulated neutral wire with wire nuts there is no connection of any white wires to this switch.
Connect 3 wire cable in the first switch box.
The 3 wire cable enters through the top of the first switch box. The red insulated wire connects to either one of the 2 unused terminal screws shown in the image above to be on the top left and right sides of both 3-way switches.
It does not matter to which terminal screw this wire is connected. Connect the black insulated wire to the remaining unused terminal screw on the switch. Connect wires in the light fixture's box. Again, connect all ground wires as previously described, if not already completed. In the light fixture's box, there will be two 3 wire cables. One 3 wire cable originates at the first switch box and has its white insulated wire as a neutral. The other 3 wire cable originates at the second switch box and will become the "switch leg".
Mark both ends of this wire by wrapping it with black electrical tape to alert others working on the circuit later that it is no longer neutral. Connect the two red insulated wires together with a wire nut. Connect the black wire coming from the first 3-way switch and the white "switch leg" wire coming from the second 3-way switch has black tape wrapped around it together with a wire nut.
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Connect 3 wire cable in the second switch box to the switch. Connect all ground wires as previously described, if not already completed.
Connect the black insulated wire to the shunt or common terminal screw of the switch once again, the common screw terminal is the different colored screw from the rest of those on the switch.
Connect the red insulated wire to one of the two unused terminal screws it does not matter which. Connect the "switch leg" white wire with black tape to the remaining unused terminal screw on the switch. Connect the fixture. The light fixture's box should have only a black wire, a white wire and a ground wire to supply power to the fixture. Finish up. Check all wire nuts for tightness and exposed neutral and hot conductor surfaces. Fold all wires carefully into the boxes and secure devices and fixture with screws.
Install plates and covers. Restore power and test. Part 4 of Understand non-metallic cables.
NM cable is easier to work than other cable types, requires no special tools or preparation, and costs less. For these reasons, it is widely used.
It is not, however, authorized for use in all installations, such as being embedded in concrete or where exposed to the risk of physical damage. Armored cable types are very similar with only slight variations. They consist of a metal jacket formed by an interlocking, helically wound band of steel or aluminum around two or more insulated wires - including one white, one black, and often one green. Cables lacking a green insulated wire use the outer metal jacket as the ground conductor.
Type AC is fabricated with a continuous internal bonding conductor in contact with the metal sheath. Of these armored cable types, only Type NM can be installed outside or for direct burial underground, and only if listed tested and labeled for that purpose.
Know the restrictions of each cable type. There are unique precautions and instructions for each type and special connectors for armored cables. For example, do not use a Romex Type NM connector on an armored cable, even though many connectors appear similar.
If the power source is from an armored cable that lacks a full size 12 or 14 ground wire, use a metal box to extend the ground from the armored shell to the box and to the circuit's ground wire. Do this by threading a special green, hex-headed grounding machine screw into a pre-tapped hole in the metal box, or use a special green ground clip.
Become familiar with cable naming conventions. All of these cables have "trade names" which are basically derived from the number of insulated non-ground conductors, construction type and manufacturers' names. Some types of BX are also tested and approved for using the sheath as a grounding or bonding conductor.
A basic two-way switch is pretty straight forward. You'll only have three screws. The green is for the ground wire and the other two on either side are for the black hot wire. The white neutral wire is not connected to it it is typically just wire-nutted in the box. The idea behind a switch is that it opens or closes the connection on the black wire when you flip it.
Not Helpful 0 Helpful 1. Yes, but it's probably better to replace it with a regular, single-pole switch.
Then you'd connect the black power wire to one side of the switch and the black wire from the light to the other side of the switch and connect the white neutral wires together. Not Helpful 3 Helpful 2. Unanswered Questions. I have black, red, white, and ground cables coming into the fixture box. How do I wire the fixture? Include your email address to get a message when this question is answered.
By using this service, some information may be shared with YouTube. Diagnose and treat problems with the switches differently depending on the relative placement of the switches and the power source.
Helpful 13 Not Helpful 5.
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The "back wire-able" option provided on some switches and outlets allows for simple insertion of a stripped wire into a hole for connection without the need of turning a screw. Over time, these pressure connections fatigue and eventually fail, so the use of screw terminals is preferable.
Helpful 8 Not Helpful 6. When remodeling, always check the fuse or circuit breaker on which new lights or outlets are being installed.
How do you hook up a 3 way switch
Helpful 11 Not Helpful Never install a gauge wire on a circuit that is protected by a breaker or fuse that has a higher capacity than the wire you're using: 6 gauge - 50A, 8 gauge - 40A, 10 gauge - 30A, 12 gauge - 20A, 14 gauge - 15A. Do not connect smaller wires to the electric panel, unless they are the leads of a transformer for a doorbell or similar circuit.
Helpful 0 Not Helpful 0. Use the smaller, easier to work and less expensive 14 14 gauge copper Romex cable if the circuit is protected by a 15 amp fuse or circuit breaker. Very few three-way circuits switch loads on a 20 amp circuit. It is not necessary to use 12 wire branching from an existing 14 wire circuit. Number 12 gauge is required by code for kitchen and dining room receptacles, and other appliances washers, refrigerators, etc.
One wire per terminal.
Do not connect more than one wire under a screw terminal. Additionally, the wire should wrap clockwise around the screw. Only wrap solid wire around a terminal screw. Stranded wire will require fork or ring terminals to be installed crimped or soldered on the wire and the terminal screw tightened down on the fork or ring terminal. If a larger load is to be connected, the appropriately larger sized wire and circuit breaker or fuse must be installed instead.
The circuit's maximum design load - in this case watts - is determined by Volts X Amps X. The same for a 20 amp circuit: 20 X.
3 Way Switch Wiring Diagram. 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 . 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 3-way switch in the basement. Pro tip: It's likely you'll also need to replace the existing switch box with a larger one to accommodate the extra wires for Author: The Family Handyman. While a normal switch has two terminals (the "on" and the "off" positions), the three-way switch has three, obviously, which is the two normal "on" and "off" terminals, plus a third for connecting to the other switch or the device. Basically, you need all three items (Light, 3-Way Switch 1, and 3-Way Switch 2) to connect together.
Submit a Tip All tip submissions are carefully reviewed before being published. Check you local wiring rules, as your local wiring system may use a different color combination.
Helpful 6 Not Helpful 4. The red wire then goes with the other three to connect both switches. You may be wondering, "How do I hook up a Z-Wave 3 way switch? How could we not mention 3 way Z-Wave switches? The only difference is that some Z-Wave 3 way switches don't require a traveller wire, which actually makes the install a tad bit easier, however, others do, which makes installing them exactly the same as standard 3 way switches. Either way, the directions are the same. Linear's 3 way Z-Wave switches do not require a traveller wire, so if you do not have one, its okay.
In fact, if you have 3 way lighting set up in your house and you don't want it anymore, you can program one of the Linear switches to control a different Z-Wave device rather than the original light it controlled. The former is a standard Z-Wave switch and the latter is the slave unit that can be used to control either the 3 way light or a separate Z-Wave device.
Save my name, email, and website in this browser for the next time I comment. Beginner's Guide. What do 3 way switches do? How should I connect my 3 way switch? How to Wire a 3 Way Switch You have two options for wiring a 3 way switch: running the power through the switches to the light or from the light to the switches.
Black - This is a HOT wire, meaning that power is running through this wire. Make sure your fuse is turned off while wiring this kind of wire! White - This is a neutral wire paired with the black. Red - This is a switch wire or traveller wire, used to carry current inside the switch. Green or Bare - This is a ground wire that grounds the entire current. Quick Note. Option One Three way switch with the power going through a switch With this configuration, the power flows from the fuse box, through Switch 1, to Switch 2, and finally to the light fixture.
Option Two Three way switch with the power going through the light. GE Three-Way Switches. Author Recent Posts. Latest posts by Tony see all. Related Posts. Looking for a Z-Wave Robot Vacuum?