When to Use 3 Way or 4 Way Switch?
Here is key findings about When to Use 3 Way or 4 Way Switch.
Usually when a 3-way switch fails, lights can be toggled on and off at one switch, but not the other. If one of the two 3-way switches toggles the light(s) on and off, the other 3-way switch has probably failed. Follow these steps to find which switch is bad. Toggle each switch until the light come on.
Do both switches need to be 3-way?
No, you can use each switch for a different 3-way circuit. No, it isn’t necessary to replace both switches as long as the position you’re installing it in has access to the neutral.
How do I know if I 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.