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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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  • Former Community Member
    0 Former Community Member
    mapj1:

    UK doesn't need AFDDs, for the matter all of the IEC world.


    I'm inclined to agree, I'm not even convinced by the sparse data available from the US experience that they are all that especially useful in 110V land either, but neither of us are writing the UK regs.

    If we did they'd look a bit different.

    And there would not have been discussion threads like these where the need for AFDDs or otherwise is discussed at length.
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    Just look at the history. AFCI were soley created to deal with the lack of earth fault loop impedance in the US. UK wiring regs front and center stage in research. 


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  • Former Community Member
    0 Former Community Member
    mapj1:

    UK doesn't need AFDDs, for the matter all of the IEC world.


    I'm inclined to agree, I'm not even convinced by the sparse data available from the US experience that they are all that especially useful in 110V land either, but neither of us are writing the UK regs.

    If we did they'd look a bit different.

    And there would not have been discussion threads like these where the need for AFDDs or otherwise is discussed at length.
    one  

       two  

     three    

     four     
    five

      M.




     





    Just look at the history. AFCI were soley created to deal with the lack of earth fault loop impedance in the US. UK wiring regs front and center stage in research. 


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