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Table 52.3. Could someone explain it to me, again, please!

alanblaby
I've done an EICR this morning, all in perfect condition, apart from two Code 3's, a plastic CU, and a boiler supply on a 1mm T+E cable.

I've marked it as a '3', as Table 52.3 says a 'power circuit' , should be supplied by a minimum conductor size of 1.5mm.

This circuit is protected by a 6 amp, type B circuit breaker, and further on, a 3 amp BS1363 fuse.

So there is no safety issue at all.


Has it ever been explained why this table has been included, and why these figures are used?
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    In a word, harmonization. 1.5mm2 is the smallest cable size associated with the continental combined lights and power circuit, as it is usually breakered at 16A or less,  in some places 10A(France) or 13A  (Swiss).

    1 mm is a bit weedy mechanically,, but it is far less likely to be snapped when permanently clipped to the wall than it is in  a flex to an appliance, and we allow it there.


    The cartridge fuse either in the plug or in an FCU near the load is a uniquely UK concept.


    However, in general the continental installations  do not have a 1mm2 cpc in their 1.5mm2 cables either, and as yet the UK has not moved to requiring a  full size CPC. Though it may happen - it has in Eire.
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  • 0
    In a word, harmonization. 1.5mm2 is the smallest cable size associated with the continental combined lights and power circuit, as it is usually breakered at 16A or less,  in some places 10A(France) or 13A  (Swiss).

    1 mm is a bit weedy mechanically,, but it is far less likely to be snapped when permanently clipped to the wall than it is in  a flex to an appliance, and we allow it there.


    The cartridge fuse either in the plug or in an FCU near the load is a uniquely UK concept.


    However, in general the continental installations  do not have a 1mm2 cpc in their 1.5mm2 cables either, and as yet the UK has not moved to requiring a  full size CPC. Though it may happen - it has in Eire.
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