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A three-way light switch allows the light to be controlled from two locations. How does this work?

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There might be some confusion because the type of switch you need (single-pole, double-throw) is usually called a three-way switch in the US, and a two-way switch in the UK. So for two switches to control the same lights, you need two SPDT switches, and you can find the wiring diagram on Wikipedia.

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Between the two switches is another cable wire connecting both switches. then they both work like train track switches alternating the on/off current to the fixture.

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