How to Perform Megger Test on Final Distribution Board Step by Step?

To perform a Megger test on a final distribution board, first ensure all end-user loads such as lights and motors are disconnected, along with any installed electronic meters. Confirm that there is no incoming live power supply. The insulation resistance should be measured between ground and phase, ground and neutral, and between all phases in a three-phase system. The acceptable insulation resistance value must be above 1 megaohm. For cables like 4-core copper XLPE/SWA/PVC rated for 400/480 volts, tested at 1000 volts, the minimum insulation resistance should also exceed 1 megaohm. It is necessary to disconnect the cable from the main distribution board and transformer feeder pillar before testing.
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