3 way switching refers to a circuit where two switches control the same light or lights. They are used to control lights from two different locations, such as hallway switches or stairwell switches. In a 3 way switch, one of the switches is the power source, and the other switch is used to control the lights.
How Does 3 Way Switching Work?
3 way switching is achieved by using special switches called 3 way switches. These switches have three terminals instead of the normal two, and they are designed to be used in pairs. The power source is connected to one switch, and the other switch is connected to the lights. When the switches are in different positions, the circuit is open and the lights are off. When the switches are in the same position, the circuit is closed and the lights are on.
In a 3 way switching circuit, power enters at one switch and the hot wire is connected to the common terminal. The other two terminals are called travelers, and they are connected to the travelers on the other switch. The other switch is connected to the load (lights) and the neutral wire.
Wiring Diagram for 3 Way Switching
The wiring diagram for a 3 way switch is fairly simple. The power source is connected to one of the switches and the other switch is connected to the lights. The switches are then wired together using travelers. The wiring diagram can be diagrammed as follows:
| Wire | Color | Terminal |
|---|---|---|
| Hot | Black | Common |
| Traveler 1 | Red | Traveler |
| Traveler 2 | White or Black | Traveler |
The black wire is connected to the common terminal on one switch, and the red and white or black wires are connected to the travelers on both switches. The white or black wire on the second switch is connected to the load (lights) and the neutral wire.
FAQs
What is the difference between a 3 way switch and a 4 way switch?
A 3 way switch controls a light or lights from two locations, while a 4 way switch controls a light or lights from three or more locations. A 4 way switch is used in combination with two 3 way switches to control lights from two or more locations.
What is a double pole switch?
A double pole switch is a switch that has two separate circuits that can be controlled independently. They are commonly used to control high voltage appliances, such as heaters or air conditioners, and are not used for lighting circuits.
Can I use a dimmer switch with 3 way switching?
Yes, dimmer switches are available that can be used with 3 way switching. However, special dimmer switches must be used that are specifically designed for use with 3 way circuits.
What is a three wire switch?
A three wire switch is a type of switch that has three wires connected to it. They are commonly used in lighting circuits to control a light or group of lights from a single switch. They are not used in 3 way switching circuits.
Can I use a regular switch instead of a 3 way switch?
No, a regular switch cannot be used in a 3 way switching circuit. 3 way switches have three terminals instead of two and are specifically designed to be used in pairs to control a light or group of lights from two separate locations.
In conclusion, a 3 way switching circuit is a great way to control a light or group of lights from two separate locations. By using special 3 way switches and wiring them correctly, you can achieve this type of control with ease.
