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AFDDs AMD 2

John Peckham
In response to the suggestion of separate threads for individual changes to the 18th I thought I would start this one for AFDDs.


So what are the forum members views on the new requirement for AFDDs?


What is the safety case for the change? E.g impact on public safety, fires etc.Evidence?


What is the impact on the installation industry? How easy to fit, cost advantages disadvantages etc?


Will you feedback to the BSI on the changes and what will you say?


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  • 0
    Chris Pearson:
    Sparkingchip:

    Just how can An AFDD like this be installed in an UK tin can consumer unit?


    See four posts up the page for details. What seems rather odd is that when you look up these devices, it says nothing about the type of CU which is required. It took quite a bit of searching to find the answer.






    The fourteen mod consumer unit in the illustration supplies three circuits.

    main switch = 2

    SPD = 2

    3 x AFDD = 9

    1 x unusable = 1

    Total = 14


    The double stacked CU could supply around eleven circuits bearing in mind AFDD are not required on lighting circuits, I am not sure if you can transition from the dual pole to single pole busbar to fit one mod MCBs or RCBOs next to AFDD.


    They seem to think that three AFDD would be sufficient in an installation with the majority of circuits not being protected by them.


    That rules out retrofitting them as replacements in the majority of homes.


    Andy B.


Reply
  • 0
    Chris Pearson:
    Sparkingchip:

    Just how can An AFDD like this be installed in an UK tin can consumer unit?


    See four posts up the page for details. What seems rather odd is that when you look up these devices, it says nothing about the type of CU which is required. It took quite a bit of searching to find the answer.






    The fourteen mod consumer unit in the illustration supplies three circuits.

    main switch = 2

    SPD = 2

    3 x AFDD = 9

    1 x unusable = 1

    Total = 14


    The double stacked CU could supply around eleven circuits bearing in mind AFDD are not required on lighting circuits, I am not sure if you can transition from the dual pole to single pole busbar to fit one mod MCBs or RCBOs next to AFDD.


    They seem to think that three AFDD would be sufficient in an installation with the majority of circuits not being protected by them.


    That rules out retrofitting them as replacements in the majority of homes.


    Andy B.


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