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Rcd tripping on no trip whilst doing zs reading

Craig Burton

Did a zs test today on a ring main newly installed, had done end to end & ins res & rcd tripped when i pressed meter to go. Tested on another socket circuit which was existing circuit in the property & it did the same switched off all mcb's apart from mine & it still tripped. Plugged hoover in to new circuit to see if it would trip & it was fine. Never had it before. If i was doing a periodic how can i test zs if it does this & why would it do that. 

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    Hi Craig. Just a thought, 
    Could you please specify the make and model of the tester you are using? Have you experimented with the 3-low and 2-low settings? In my experience with the Megger tester, the 2-low setting tends to avoid tripping, whereas the 3-low setting often results in a trip.

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    Hi Craig. Just a thought, 
    Could you please specify the make and model of the tester you are using? Have you experimented with the 3-low and 2-low settings? In my experience with the Megger tester, the 2-low setting tends to avoid tripping, whereas the 3-low setting often results in a trip.

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