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RCD S type testing

Sparkymania
Hi all


I was using the RCD S type test on a Megger MFT1711.


It does a 30 second countdown from when the test button is pressed before doing the test. This seems to have no function at all. Although you can bypass this delay by pressing the test button again I still don't see what this delay would do.


Any thoughts on this?



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  • 0
    My understanding is the tester gives the RCD a tickle to check it doesn’t trip to early to ensure it should discriminate with a 30 mA RCD downstream stream of it that should trip before the 100 mA time delayed RCD, from memory at less than 70 mA  and less than 130 mS.


    Andy Betteridge
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  • 0
    My understanding is the tester gives the RCD a tickle to check it doesn’t trip to early to ensure it should discriminate with a 30 mA RCD downstream stream of it that should trip before the 100 mA time delayed RCD, from memory at less than 70 mA  and less than 130 mS.


    Andy Betteridge
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