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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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    https://www2.theiet.org/forums/forum/messageview.cfm?catid=205&threadid=61562




    That thread shows more confusion.

    Do posts on here ever get reported back to the relevant Committees? Geoff?

    Why dont we get some guidance, as, at the moment, a boiler on a 1mm T+E circuit needs to be replaced in a rented house, as it does not comply, which is mad, as it is totally safe.

    In fact 1.5 mm² T&E is no use for a power circuit because the CPC is only 1.0 mm² (524.1) unless it is a spur using an FCU (Appendix 15)


    524.1 references Table 52.3. 

    App. 15 is informative, and doesnt show 10 or 16 Amp circuit protection, so obviously smaller cable is not used in the diagrams.

    With good design, and circuit calculations, a 1mm conductor will be more than adequate for a 3 amp 'power circuit' load. 

    But it cannot be used due to Table 52.3.

     


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  • 0

    https://www2.theiet.org/forums/forum/messageview.cfm?catid=205&threadid=61562




    That thread shows more confusion.

    Do posts on here ever get reported back to the relevant Committees? Geoff?

    Why dont we get some guidance, as, at the moment, a boiler on a 1mm T+E circuit needs to be replaced in a rented house, as it does not comply, which is mad, as it is totally safe.

    In fact 1.5 mm² T&E is no use for a power circuit because the CPC is only 1.0 mm² (524.1) unless it is a spur using an FCU (Appendix 15)


    524.1 references Table 52.3. 

    App. 15 is informative, and doesnt show 10 or 16 Amp circuit protection, so obviously smaller cable is not used in the diagrams.

    With good design, and circuit calculations, a 1mm conductor will be more than adequate for a 3 amp 'power circuit' load. 

    But it cannot be used due to Table 52.3.

     


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