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Megger testing technique questions

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  1. michaellabeit is offline Junior Member Pro Subscriber
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    I listened in on a Megger webinar on insulation resistance testing by Jo Jewett, one of Megger's senior engineers. He said that the polarity doesn't matter for IR tests. Moreover, Megger's A Guide To Diagnostic Insulation Testing Above 1 kV states the following on page 6:


    "With modern insulating materials there is little, if any, difference in the reading obtained, regardless of which way the terminals are connected. However, on older insulation, a little known phenomenon called electroendosmosis causes the lower reading to be obtained with the positive terminal connected to the grounded side of the insulation being tested."

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