At the line switch box the black wire of the two wire line cable gets connected to the copper or black screw terminal on the three way switch. Two black and one red.
3 Way Switch Wiring Diagram
What is the red wire in a three way switch. 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. This 3 way switch wiring diagram shows how to wire the switches and the light when the power is coming to the light switch. In this diagram the incoming hot wire attaches to the first switchs common dark colored terminal. Remember the black wire that you wrapped around the traveler wires is the common. Wall switches used to control ceiling light fixtures or other fixtures come in three types. With nm cable the wire colors for travelers will be black and red using 3 wire cablewith conduit the wire colors for travelers could be any color.
The 3 wire cable enters through the top of the first switch box. For example a long hallway or stairway might use a pair of three way. 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. You should have three remaining wires in each box. The red and black wires travelers of the 3 wire cable get connected to the common terminals on the three way switch. Well cover the easier scenario first.
It could be there is or once was a three way switch in play. Keep in mind that the traveler terminals for red black wires are universal and will work regardless of which one the traveler wire is connected to. Most common is the single pole switch the type used to control a light fixture from a single locationthe next most common is the three way switch which is commonly used to control a light fixture from two different locations. C now connect the traveler red black wires from the new 3 wire romex cable to the two traveler terminals at the top of 3 way switch 1 the first switch. 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. The three way switch is a variation of the standard single pole switch which controls a light only from one locationa third type is the four way switch which is used in conjunction with two three way switches to control lighting from more than two locationsthis configuration may be used in open plan homes or in large kitchens or great rooms where a central bank of lighting fixtures might.
3 way switch wire colorsthere is no standard for wire colors on 3 way switch travelersthe colors will vary depending on whether nm cable or conduit was used. Each 3 way switch in these examples are controlling the power source to the same load. The two hot wires of three wire cable connect to a pair of. Strip all three wires with wire strippers. Connect 3 wire cable in the first switch box. Or it could be the red wire is the wire going to the fixture and the black wires are the live wires.
Take your three way switch. It doesnt matter which traveler goes on which common terminal. 3 way switch wire diagram power to light switch. When you see a red wire in a light switch box it can mean two things. You will see a black screw and two gold screws on the switch. It does not matter to which terminal screw this wire is connected.
Gallery of What Is The Red Wire In A Three Way Switch
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