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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
    I assume that the 30 seconds comes from the type approval standarrd for RCDs - where manufacturers samples are being tested to show they meet the standard - the time between the formal test will be set to be so long that there is no question of the internals having a 'hang-over' from any earlier test.

    However, you are quite right,  any real RCD will have either analog integration with capacitors, or some kind of digital counter that resets in a few seconds at most.
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  • 0
    I assume that the 30 seconds comes from the type approval standarrd for RCDs - where manufacturers samples are being tested to show they meet the standard - the time between the formal test will be set to be so long that there is no question of the internals having a 'hang-over' from any earlier test.

    However, you are quite right,  any real RCD will have either analog integration with capacitors, or some kind of digital counter that resets in a few seconds at most.
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