How to Replace a Standard Light Switch
Understand the limits of a simple switch replacement and avoid confusing single-pole, three-way and smart-switch wiring.
What to know
Identify whether the device is single-pole, three-way, four-way, dimmer or smart.
What to check
Turn off and verify power at every conductor.
How to approach it
Photograph the existing wiring and label travelers or line conductors before removal.
Common warning signs
Use a device rated for the circuit and application.
When to stop
Do not assume wire color proves function; verify the circuit.
Common mistakes
- Replacing parts before identifying the cause
- Skipping measurements or manufacturer instructions
- Using fasteners or materials not rated for the application
- Closing the repair before checking for hidden damage
If more than two insulated conductors are on the switch, stop and identify the circuit type before moving wires.
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