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AFDD Trip times

Former Community Member
Former Community Member
HI, just wondering how people are testing domestic AFDD'S 

I have been testing 30ma single pole AFDDs and im getting rcd disconnection times of roughly 80ms on 1x.

Is this normal? they consistently come up with around 80ms which is obviosly over the permissable 40ms.


my question is am i testing these wrong? is there a different way of procedure to test these devices? they are all the wylex brand if thats any help.


many thanks in advance for your responses
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    Sparkingchip:

    Unless it’s a final circuit in a TT earthed installation?


    Only if you have extremly poor Zs - a 30mA RCD should open within 150ms at 60mA (table 3A of appendix 3) - well within the 0.2s ADS requirement - which you'd get with Zs of up to 3833Ω - but then you'd be way over the 50V/Ia limit of 1667Ω anyway.


       - Andy.


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  • 0
    Sparkingchip:

    Unless it’s a final circuit in a TT earthed installation?


    Only if you have extremly poor Zs - a 30mA RCD should open within 150ms at 60mA (table 3A of appendix 3) - well within the 0.2s ADS requirement - which you'd get with Zs of up to 3833Ω - but then you'd be way over the 50V/Ia limit of 1667Ω anyway.


       - Andy.


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