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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
    And it’s not a simple click out, in in upgrade to add RCBOs or AFDD to an older Wylex and Crabtree consumer units.


    The new Wylex RCBOs and AFDD don’t fit onto the comb busbar as they don’t have the slot behind the terminal screw, only the hole for a pin busbar.


    New Crabtree devices look like they should fit older consumer units, but don’t as they are not compatible. I replaced an entire Crabtree consumer unit because someone fitted a new split load RCD to replace an older one and the busbar overheated melting the shroud, the manufacturer said they should not have fitted the new device in the older CU.


    Andy Betteridge
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  • 0
    And it’s not a simple click out, in in upgrade to add RCBOs or AFDD to an older Wylex and Crabtree consumer units.


    The new Wylex RCBOs and AFDD don’t fit onto the comb busbar as they don’t have the slot behind the terminal screw, only the hole for a pin busbar.


    New Crabtree devices look like they should fit older consumer units, but don’t as they are not compatible. I replaced an entire Crabtree consumer unit because someone fitted a new split load RCD to replace an older one and the busbar overheated melting the shroud, the manufacturer said they should not have fitted the new device in the older CU.


    Andy Betteridge
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