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Electrical Wire and Cable

How to Test a Light Switch

By Dave Rongey - Summary:

How can I use a voltage tester to check a light switch? The Most Common Methods for Testing a Light Switch, Testing a Switch with a Continuity Tester, Testing a Switch with a Voltage Tester.

Testing a Light Switch

Electrical Question: How can I use a voltage tester to check a light switch?

Any theory will help.
Thank you.

This electrical wiring question came from: Angel, a Handyman from Joliet, Illinois.

Dave’s Reply:
Thanks for your electrical wiring question Angel.

How to Test a Light Switch using Electrical Testers


Application: Testing a Light Switch.
Skill Level: Intermediate to Advanced – Best performed by a qualified electrician.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester or Continuity Tester.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the light circuit, turn it OFF and  Tag it with a Note before working with the wiring.
Notice: Testing with the circuit power on can be dangerous and should only be done by qualified or experienced electricians.

The Most Common Methods for Testing a Light Switch

Why a Tester May Read Voltage while the Light Switch is Off

More about Light Switches

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