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They are called three-way-switches. They are both wired into the same circuit that controls the light.

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โˆ™ 2015-07-15 18:43:42
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Q: How can two switches on different floors turn on one light?
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Related questions

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It is dependant on whether the switches are in wired in a parallel or series configuration. If the switches are wires in parallel then both switches would have to be off to turn the light bulb off. Either switch could turn the light bulb on. If the switches are wired in series then both switches would have to be on to turn the light bulb on. Either switch could turn the light bulb off.

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