HV Test Services: Switchgear Testing , AC & DC Hipot
A 50Hz AC overvoltage pressure test is recommended for switchgear even though DC is allowed at much higher levels.
Note that the test needs to be completed between phases and separately in an open and close state to ensure comprehensive testing takes place.
A high milli-ammeter reading does not necessarily indicate a breakdown in the insulation. Breakdown of insulation is where the milli-ammeter becomes unstable and increases suddenly where the voltmeter drops.
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