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"Megger" is an abbreviation of MegOhm meter, ie a device for measuring insulation resistance, in the MegOhms range.
Why do we measure insulation resistance?
If the electrical insulation does not have sufficient resistance:- Humans may be harmed by coming into contact with dangerous voltages- High voltages may leak into computer equipment, damaging it- Lightning surges can cause the insulation to fail- Current can flow through the insulation, heating and weakening it. Eventually, the wires touch (maybe starting a fire), the generator gets overloaded, and the intended load receives no power- This can happen if water gets into equipment; water can conduct electricity, if it has some chemical compounds dissolved in it. Poor quality insulation is bad for everyone using electricity.