A simple voltage tester can be much more than it seems. Discover how understanding its hidden functions can revolutionize your approach to everyday electrical work.
Why Can the Voltage Tester Light Up on Both Sides of an Electrical Outlet?
It’s common for a voltage tester to light up on both sides of an outlet, surprising many DIY enthusiasts. Several reasons explain this phenomenon:
Residual voltage: In cases of an open or poorly connected circuit, stray voltages can circulate, triggering the tester’s light.
Polarity reversal: Incorrect wiring can mislead the tester into indicating that both terminals are live.
Electromagnetic induction: In environments with strong electromagnetic fields, weak currents can form, enough to light the tester.
Important: Stay vigilant—such behavior often signals a malfunction in the electrical installation.
How to Distinguish Live and Neutral Wires with a Voltage Detector
Using a voltage detector properly takes a bit of skill. When you touch the inside of a socket:
If the light turns on, you have touched the live wire.
If no light appears, you have likely touched the neutral wire.
Correct identification of conductors is essential to avoid accidents, especially during installation or repair work.
Alternative Use: Checking Circuit Continuity
see next page
