Thanks for all the replies so far.....

So, some more detail....

The installation is commercial. The supply is 230/400V at 400A. After tariff metering, the supply passes through a main switch & into a 500A busbar chamber.

Connected to the busbars are around a dozen 3 phase switchfuses which supply various distribution boards around this small/medium sized factory.

The switchfuse in question contains 80A BS88 fuses and has two sets of 35mm^2 lugged onto each of the bolt-on lug terminals (one on the front, one on the rear). The submains are in SWA, glanded into trunking run above the switchfuses and each goes off to service a 12 way TPN board that supplies general light & power.  Although the boards are separate (by around 15m) they do service the same general area. There is no evidence of overloading or thermal distress in the BS88 fuses & the fuses have never blown. There are no heavy loads connected to either board - the biggest MCB present in either board being 32A TP (supplying ceeform sockets).

My thoughts are pretty much inline with you you are all saying: while perhaps not the best in terms of design it doesn't actually warrant a code at all.

Thanks for all the replies so far.....

So, some more detail....

The installation is commercial. The supply is 230/400V at 400A. After tariff metering, the supply passes through a main switch & into a 500A busbar chamber.

Connected to the busbars are around a dozen 3 phase switchfuses which supply various distribution boards around this small/medium sized factory.

The switchfuse in question contains 80A BS88 fuses and has two sets of 35mm^2 lugged onto each of the bolt-on lug terminals (one on the front, one on the rear). The submains are in SWA, glanded into trunking run above the switchfuses and each goes off to service a 12 way TPN board that supplies general light & power.  Although the boards are separate (by around 15m) they do service the same general area. There is no evidence of overloading or thermal distress in the BS88 fuses & the fuses have never blown. There are no heavy loads connected to either board - the biggest MCB present in either board being 32A TP (supplying ceeform sockets).

My thoughts are pretty much inline with you you are all saying: while perhaps not the best in terms of design it doesn't actually warrant a code at all.