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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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  • 0
    AFCI were soley created to deal with the lack of earth fault loop impedance in the US

    Eh? GFCIs would sound to match that description (equivalent of our RCDs) - AFCIs (supposedly) detect arc faults - where the earth fault loop impedance would make little or no difference as none of the series arc faults and only one kind of parallel arc fault would involve the earth loop.

       - Andy.
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  • 0
    AFCI were soley created to deal with the lack of earth fault loop impedance in the US

    Eh? GFCIs would sound to match that description (equivalent of our RCDs) - AFCIs (supposedly) detect arc faults - where the earth fault loop impedance would make little or no difference as none of the series arc faults and only one kind of parallel arc fault would involve the earth loop.

       - Andy.
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