A three-way switch has three terminals; a four-way has four. These control a light from two or three switch locations, such as at the top and bottom of a stairwell, at either end of a hallway, or in a large room with multiple entrances.
Can a 4 way switch be used as a 3 way?
Sure, a 4-way is essentially two 3-ways in one device. Usually a 4 way switch has 2 (IN) screws and 2 (OUT) screws. Using one of the (IN) terminals is the same as the common terminal on a 3 way.
When should you use a 4 way switch?
You use 4-way switches in situations where you want to control a light or other fixture from more than two locations. For example, the second-floor hallway lights in my own home are controlled at four different locations. To accomplish this, you must have two 3-way switches and two 4-way switches.
What is a 4 way light switch used for?
4-Way Switches Four-way switches are used to control lighting from three or more locations. Four-way switches are used in combination with three-way switches. There are four terminals that provide two sets of toggle positions on a four-way switch.
How do you tell if you have a 3 way switch?
A more positive way to identify a 3-way switch is to look at the body of the switch and count the number of screw terminals: a 3-way switch has three terminal screws plus a ground screw. Two of the terminals are a light color—bronze- or copper-colored—and are called travelers.
Can you put a dimmer on a 3 way switch?
3-Way Dimmer Switches When using a 3-way dimmer switch, you should only have one dimmer on the circuit. The other switches (you can have more than one) must be on-off switches only. In this setup, the light level is controlled from a single location, whichever light switch you replace with the dimmer switch.
Why does my three-way switch not work?
Sometimes, a 3-way circuit doesnt work because someone tried to replace a defective switch and did not properly connect the wires. Disconnect all three wires (or four, if the outlet is grounded) from both switches. Separate the wires so that they are as far away from each other as possible. 2) Turn the power back on.