02/22/2026
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The wiring for a 3-way switch setup, enabling control of a single light fixture from two different locations. The power source feeds into one switch and connects via a 2-wire cable to the fixture, while a 3-wire cable connects the two switches. The red and black wires act as "traveler" wires, allowing the switches to alternate control. The white wire is re-marked as "hot" to denote it’s carrying power, deviating from its usual neutral role. The common screw, typically copper or black, connects the hot wire on each switch. Ground wires (not shown) should be attached for safety at each box. This setup is ideal for large rooms, stairways, or hallways where multiple entry points require switch control.