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How do two switches control one light bulb?

Answer

Two switches can control the light bulb by means of three-way switch. These have somewhat difficult wiring diagrams. However, they work in such a way that the circuit can be closed from either end.
Q&A Related to "How do two switches control one light bulb?"
1. Turn off the circuit breaker or, if your home has the older Edison Base fuse box, unscrew the fuse controlling the circuit you will be working on. Remove an Edison Base fuse completely
http://www.ehow.com/how_6344500_wire-lights-contro...
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