Uploaded April 2022 | Updated September 2026, 44 minutes ago

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How to find out which of several circuit breakers supplies power to a specific load.
I made a tester using a 6.8k ohm resistor and switch, a neon lamp for this.
It can generate a leakage current of 30mA at AC 220V.
When applied to 120V GFCI, leakage current is 15mA.

Materials :
Plastic Bottle
6.8k ohm 2W Resistor
150k ohm 1/4W Resistor
Neon Lamp
Push Switch(Normally Open)
Alligator Clips