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Because the cable has capacitance, and an AC source would not be able to distinguish between capacitance and leakage.

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14y ago

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Why is AC meggering not used?

You do not use AC to megger a device, because the purpose of meggering is to measure the insulation resistance of the device. You use DC to do that. If you used AC, you would be unable to differentiate between insulation leakage and capacitance.


Can you use ac supply for cable meggering?

No. The cable has capacitance, and an AC source would not be able to distinguish between capacitance and leakage.


Megger testing is done with DC or AC votage?

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Why you use DC in megger?

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