![]() This wiring system is not recommended for modern implementations and if you are planning to install a new setup or replace an older one, then the previous wiring must be used. ![]() It is also called as two wire control wiring (2 Wire Control). The next wiring design is an old system which you might find in some older homes and industrial settings. Alternative Method of Two Way Switch Wiring This method is recommended as both the line and neutral wires come from the same lighting circuit (or breaker) even though it uses more wire. The following table shows the truth table for Standard Wiring i.e., 3-Wire Control of Two Way Switch, where the output (status of the light) depends on what terminal (L1 or L2) is connected to the COM terminal. If we compare this setup with digital electronics, then this is similar to an Ex-OR Gate, where the status of the light (ON or OFF) depends on the status of the COM terminals of both the switches connected to respective L1 and L2 terminals.
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