I don't hold a current copy of regs (I did 16th in 2004 and hold only the brown books of the age). I haven't made much of an effort to check it but so far I've seen nothing which allows it, only things appearing to exclude it.
As I (and others0 have said, nothing in the regulations 'excludes' it. The thing which many people seem to think 'excludes it' is informative guidance in the (not 'normative') in Appendix 15 ...
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As for "nothing which allows it", 433.1.1 very much
does 'allow' a Method C 4mm² cable protected by a 32A MCB to supply multiple sockets - and you do not need too look/worry any further than that. The fact that there are two bits of 2.5mm cable (usually of unequal lengths) in parallel between that 4mm² cable and the 32A OPD dopes not alter anything.
Appearing in EICR's means something has to be seen to be done to 'correct it'.
Yes, if coded as C2 (or C1) it means that,
in the opinion of the person providing the EICR, something has to be seen to be done to 'correct it', since C2 means that, again i
n the opinion of the person providing the EICR, the person regards it as 'potentially dangerous'. However, BS7671 gives no guidance as to what is, and what is not, 'potentially dangerous' so one 'inspector may give a C2 to something which few, if any, other electricians would. It is difficult to talk about 'wrong' or 'incorrect', since it is a matter of personal opinion/judgement (which, in my opinion, it shouldn't be in most cases) but when gets close to that when few, if any, other electricians would have the same opinion.
However, in the case we are discussing, I would suggest that it is just
plain wrong (not just a 'difference of opinion') if something which is compliant with BS7671 should be given
any code, let alone C2 (or C1).
Assuming Appendix 15b is as described (I have no dispute on the matter) it seems it has passed many sparks by, either that or they are deliberately ignoring it.
See the preamble to the Appendices of BS7671 included above. There is nothing unacceptable about 'Ignoring' the guidance given in any of the Appendices, other than Appendix.
Kind Regards, John