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421.1.201

lyledunn
I note that this U.K. only regulation is now included in the new Irish standard IS10101:2020 as sub-clause 421.2. I am not sure if this is the U.K. committee persuading the Irish committee of the merits of non-combustible consumer units or if the U.K. committee has persuaded CENELEC such that the regulation will be included in future amendments to HD60364-4-42. Anyone know?

By the way, unlike the U.K. regulation the Irish equivalent does not seem to allow for the alternative of placing a plastic unit in an enclosure constructed of non-combustible material.
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    Nathaniel:

    II note that a recent review of domestic electrical fire origins in Sweden puts CUs high in the list


    What I think is the interesting question to ask, is why are CU electrical fires common, and then address the underlying cause(s). Is it DIYers using 1.5mm cable for a cooker circuit? Or loose N bar connections? Or loose MCB connections? Or MCBs themselves overheating? Or...? Could these issues be fixed by having double screws on the N bar / MCB? Or eliminating screws and moving to spring-loaded  contacts? Or increasing the spacing between MCBs? Or...?


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  • 0
    Nathaniel:

    II note that a recent review of domestic electrical fire origins in Sweden puts CUs high in the list


    What I think is the interesting question to ask, is why are CU electrical fires common, and then address the underlying cause(s). Is it DIYers using 1.5mm cable for a cooker circuit? Or loose N bar connections? Or loose MCB connections? Or MCBs themselves overheating? Or...? Could these issues be fixed by having double screws on the N bar / MCB? Or eliminating screws and moving to spring-loaded  contacts? Or increasing the spacing between MCBs? Or...?


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