Fair enough, but (a) if we're talking about the same reg (I'm still not sure!), a ring final would be non-compliant with that reg, regardless of any considerations of 'likely load' (because of the relationship between In and Iz), were it not for the 'dispensation of 433.1.204 (BYB), and (b) I'm not sure that it's necessarily appropriate to cite a regulation to make your point when application of the reg comes down to an educated guess on the part of the designer!Of course. He should make an educated guess as to the likely use - that's what designers are supposed to do.
Well, I only have the one but, as I said, it's 'within range' of both WM and TD - so maybe non-compliant!For example, a row of twin 13A socket-outlets directly under the CU in a utility room likely to contain a WM and TD would not be likely to conform.
Kind Regards, John