The indicator screwdriver can be found, perhaps, in every home. As you know, with its help you can check the presence or absence of voltage. The diode is on - voltage is present, off - there is a problem. Meanwhile, the possibilities of the indicator screwdriver are much wider than most owners are used to thinking.
Before you start checking the wires or circuit, you need to make sure that the screwdriver is in working order. You can touch it to the outlet or surge protector, and at the same time mark the phase and zero. In which hole the light will light up, there is the phase. When checking, do not touch the top of the tool.
If the apartment is being renovated, and wires stick out of the walls in all rooms, the owner has a natural question: "Where is the phase?" Everything is especially difficult if the wires are of the same color. Using an indicator screwdriver and an auxiliary wire, we can ring the circuit. Nobody forbids using the “old-fashioned” method with a control lamp and a battery, but an indicator screwdriver will faster perform the same function.
Even with this tool, you can check the grounding of household appliances. It is enough just to turn on the machine and touch it with a screwdriver. In our case, the indicator lit up even when we simply brought the tool to the surface without having time to touch it. Conclusion: there is no grounding.
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A source: https://novate.ru/blogs/251020/56506/
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