Range Cooker Connection Refusal.

wallywombat: 
 

BS 7671 says that B22 etc lighting accessories must be protected by no greater than a 16A OCPD, so I see no reason why appliance manufacturers can't make a similar stipulation.

That's rubbish. GLS (general lighting service) is the lighting equivalent to a socket-outlet circuit, for general purpose lamps in that case, rather than general purpose appliances.

We are talking about specific fixed appliances.
 

Ideally, manufacturers should be specifying a range, e.g. 32A-50A, to cover maximum demand (low end), and the capacity of the terminals + the internal wiring to those terminals (high end).

Why? We are talking about fixed appliances that have a dedicated circuit. It could well be that you move up from an oven requiring 25 A to a new appliance requiring 32 A … that may need new cables run? What's the issue here? Whatever range you choose, the next appliance may well not fit that.

The annoying thing is when you have an induction hob which insists on exactly 25A breaker.
 

The only reason this one's annoying, is that B25 are not (currently) used as frequently in the UK as they are in other EU countries. It's nonsense that this could well lead to a new CU requirement because not all ranges of CU have a B25 available, but that's again a UK thing going on here, that we let happen. BS EN 60898 and BS EN 61009 have B25 as a preferred value. Why should a manufacturer have to trawl through the catalogues of all providers of CUs in the UK to see whether the CU manufacturer provides a rating that's preferred in the standard. Surely the requirement here is for manufacturers to offer the range of rated mcb's and RCBO's, not cherry-pick  … UK get on board with the British Standards please.

wallywombat: 
 

BS 7671 says that B22 etc lighting accessories must be protected by no greater than a 16A OCPD, so I see no reason why appliance manufacturers can't make a similar stipulation.

That's rubbish. GLS (general lighting service) is the lighting equivalent to a socket-outlet circuit, for general purpose lamps in that case, rather than general purpose appliances.

We are talking about specific fixed appliances.
 

Ideally, manufacturers should be specifying a range, e.g. 32A-50A, to cover maximum demand (low end), and the capacity of the terminals + the internal wiring to those terminals (high end).

Why? We are talking about fixed appliances that have a dedicated circuit. It could well be that you move up from an oven requiring 25 A to a new appliance requiring 32 A … that may need new cables run? What's the issue here? Whatever range you choose, the next appliance may well not fit that.

The annoying thing is when you have an induction hob which insists on exactly 25A breaker.
 

The only reason this one's annoying, is that B25 are not (currently) used as frequently in the UK as they are in other EU countries. It's nonsense that this could well lead to a new CU requirement because not all ranges of CU have a B25 available, but that's again a UK thing going on here, that we let happen. BS EN 60898 and BS EN 61009 have B25 as a preferred value. Why should a manufacturer have to trawl through the catalogues of all providers of CUs in the UK to see whether the CU manufacturer provides a rating that's preferred in the standard. Surely the requirement here is for manufacturers to offer the range of rated mcb's and RCBO's, not cherry-pick  … UK get on board with the British Standards please.