3 Way Switch Wiring Diagram Power Into Light. This example shows the power-in cable entering the first switch box along with. Three-way light switches control a light from two locations, such as from both ends of a staircase or hallway.
Three-way switches allow you to control lights from two locations - from two doorways to a room Turn off the power to the circuit, disconnect the switches from the wires, and take the light bulbs Use better grade switches for a longer-lasting repair.
Two light switches connected to the same power source can control a single light fixture too.
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Screw the switches back into their boxes, put the switch plate covers on, and turn the power on to test the switches. This page contains wiring diagrams for household light switches and includes: a switch loop Here a single-pole switch controls the power to a light fixture. Click diagram to view full size.