Mastering the logic of three-way switches in your own home
In short: Ever wonder how two different switches control one light? Kevin O'Connor breaks down the mechanics and repair process for these common household components.
A three-way switch allows you to operate a single light from two different locations. Repairing a faulty unit requires identifying specific wiring, primarily the 'traveler wires.' The process begins with safety by turning off the circuit at the main electrical panel before removing cover plates and unscrewing the switches.
The core of the repair involves using a battery-powered continuity tester to distinguish traveler wires from common and ground wires. Once identified, these must be connected to the correct terminals on both switches. After securing the hardware back into the boxes and replacing the covers, the power is restored to test the functionality.
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Sources
- Summary by Intellect · source: How to Repair a Three-Way Light Switch | Ask This Old House
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