Two Switch Light. Normally, two or three switches that control one light are switches that are SPDT (single-pole, double-throw), unlike the simple one way switch which is SPST. Here are step by step instructions on how to wire up a two way lighting circuit or to change a existing one way light switch to a two way system.
Ever wonder how a two way light switch wiring is connected? A Two Way light switch is a simple single pole "changeover" switch with three terminals. Inside the light switch junction box, the two black (hot) wires get attached to the screws on the light switch.
The most common example of this type of switching would be on a staircase.
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It is a little more involved than simply wiring a switch at the end or in the middle of a circuit, mainly. Or you might need to wire two light switches in one box in the middle of a circuit. Circuit diagrams for two way switching of a light circuit (two wire control).