2 Way Wiring Circuit. A Two Way light switch is a simple single pole "changeover" switch with three terminals. This shows the circuit in relation to stair lights, but your fan circuit is the same.
They are wired so that operation of either switch will control the light(s). Two Way Switching Control using Three Wires. Ever wonder how a two way light switch wiring is connected?
As such, they contribute no appreciable effect to the overall resistance of the circuit, and so the only resistance we have to contend with is the resistance in the components.
Two way switching means having two or more switches in different locations to control one lamp.
If you are going to install a new one then go for three wire control method. The power can start at a fixture or either of the two switches. How to fix: The fixes I'm going to list below are a few common ways of dealing with double tapped circuit breakers.
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