Armored cable types are very similar with only slight variations. The ground wires should all be spliced together and one or two pigtails connected from that bunch should be connected to the metal box with a and to the green screw terminal on the 3-way switch. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Use wire nuts to attach the each set of two white wires together. A, also wrap black tape around the white wire from the switch to the light. A four way switch is added when there are more than two switch locations operating the same light.
At the lights the hot source is spliced to the black wire running between lights, it does not connect to the lights. There are two methods of making 2-way switching connection one is 2-wire control and another is 3-wire control. Shown below are two fixtures between 3 way switches. A minimum of 24 cubic inches is required if 14 wire is used. Caution: Local and provincial codes should be checked before starting any wiring project. The circuit should be shut off, and the box and enclosed wiring should be inspected carefully to discover any uninsulated portion of wire which may cause the problem.
The actual installation of the wiring is different. They support hot conductors traveller wires , which receive and transfer electricity from each of the three-way switches. If in doubt, hire it out. The black or hot wire is routed to a switch and then is fed back through the connections via a white wire taped with black electrician's tape to indicate that it is hot. One 3 wire cable originates at the first switch box and has its white insulated wire as a neutral. Electric Switch Parts and Materials: Electrical parts and materials for wiring switches should be approved for the specific project and compliant with local and national electrical codes. Click Image or to enlarge Diagram Option 3.
Attach the black power cable from the wall to the general screw black in the three-way light switch. You have also to make space for the three way switch because of many wires then single switch. 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. On older wires where the color is not very distinguishable, I use colored electrical tape to identify the conductors. All three switches are connected together by a control cable.
Become familiar with cable naming conventions. Remember only two wire cable with ground is necessary for the boxes at the lights we see there. . I suggest that you change one switch. Add an extra foot for every connection you will make along the line.
Connect all ground wires as previously described, if not already completed. Please note that not every existing 3-way switch installation has the same wire colors. Fixture Controlled by Two Switches: Power Through a Switch Box Two three-way switches control one light with the electric power coming through the first switch, flowing to the second switch, and then to the light fixture. You want to zig-zag them, so they come about a bit like an accordion. Twist the stripper or rotate it 360 degrees, sliding the insulation off the wire as it breaks loose under the cutting blades.
Both three-wire and two-wire cable with ground are used. How to Fix Light Switch Wiring and Three Way Switches Application: Electrical Wiring for 3-Way Light Switches. In order to code the white wire, which is used as a power wire from the light fixture through the switches, black electrician's tape is wrapped around the wire in the boxes. Basic 2-Way Circuit - Power Coming In At Switch. Be sure to check local building codes for proper installation and permits. I have detailed, quite extensively, why a two wire control system can be problematic in the article.
Track each with a finger to its conclusion at the light fixture to ensure proper connection. Note which wires are connected to the copper or black screw terminals. If there are more than 2 lights, the red is pigtailed to the fixture hot and to the red wire running on to the next light. Take all three ends and hold them together, then twist on the wire nut so they are all securely fastened together. If a larger load is to be connected, the appropriately larger sized wire and circuit breaker or fuse must be installed instead. This switch works in combination with two three-way switches to control electricity to lights and receptacles from three locations. The neutral is spliced to the white wire feeding the first fixture, via cable C1,where it is spliced to the neutral of both lights.
At L2 this white wire connects directly to the neutral terminal on the light fixture. 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. Materials: Make sure replacement 3-way light switches have the same amperage and voltage rating as the original three way light switch, and is the switch is fully compatible with the electrical circuit, the light fixture and the type of light bulbs being used. If you find no continuity or constant continuity in any of the possible arrangements when you flip the toggle, the switch is likely defective. In this tutorial, we will show you how to make 2-way switching connection. If the switch or junction box is metal, it too must be securely grounded with a green ground screw or approved grounding clip. In the book I provide insight into identifying the fan.