Sorry, you've lost me here. 1(a) says "replacing any fixed electrical equipment..." and 1(c) says "Re-fixing or replacing enclosures ....". What is not clear about that?Is it? As you can see not to me!This is surely fairly clear - 1(a) is about fixed electrical equipment, but 1(c) is about enclosures?
NO - you are confusing Part P and notification. It's notifiability we've been talking about but, regardless of whether one regards the job as notifiable or not (and regardless of whether one notifies or not), fitting a 10.5kW shower to a 4mm² cable would, I'm sure, be non-compliant with Part P (since that could not be regarded as making reasonable provisions for safety) - and hence illegal.... she wants a nice new 10.5kW shower installed as she is not happy with the performance of her existing 7.2kW shower, the circuit is 4.00mm T&E and the protective device is a 32B MCB.
The law according to schedule 4 allows me to put this shower in providing I do not replace the cable for new? bearing in mind BS7671 is not a legal document.
Kind Regards, John.