Secure - I take your comments constructively, thank you. I do think only 1 is possibly valid, though. The OP has specified the total fused load in this unit is 65Amps (a 45A, 15A and 5A) no diversity applied. This is less than such a unit could be facing with 2 x 30A ccts and 2 X 5A ccts - I cannot see that the size of the tails, which will have been fused accordingly by the DNO, is going to be a limiting factor.
The point re the switch's 63Amp continuous load limit and the fusing limit was/is, AFAIK, a limit applied to BS3036 rewirable fuses, based on the peak let through current and the time current characteristics of the fuse (for the same reason that a .725 rating factor is applied for cable sizes protected thereby - which requires a 30A cct to be cabled as if the peak load were 42A). Whether this design resulted from the fact that fuse wire came in a 30A size or vice versa I don't know. I've just been through the, limited, Wylex data I have here and cannot find it listed as a limit with Wylex listing a 45A cartridge fuse for use with this kit. I will check this with Wylex on Mon, but, as I say, there's no indication of it in the Wylex docs I have. The CU, other than this switch, is not limited.
It is a fact, though, that many many of these units had cooker ccts installed right from the start - fused as this OP's is. If you had been called to this OP's house to disconnect the old cooker and connect his new, would you have refused to do it? Would you have disconnected the existing cooker and left it disconnected for the reasons you give above?
It would not have been any less safe or compliant after the new cooker had been installed than before - or indeed, in any way, unsafe, IMVHO, but I will confirm with Wylex and post their reply asap (even if it proves me to have been talking OOMA).
The point re the switch's 63Amp continuous load limit and the fusing limit was/is, AFAIK, a limit applied to BS3036 rewirable fuses, based on the peak let through current and the time current characteristics of the fuse (for the same reason that a .725 rating factor is applied for cable sizes protected thereby - which requires a 30A cct to be cabled as if the peak load were 42A). Whether this design resulted from the fact that fuse wire came in a 30A size or vice versa I don't know. I've just been through the, limited, Wylex data I have here and cannot find it listed as a limit with Wylex listing a 45A cartridge fuse for use with this kit. I will check this with Wylex on Mon, but, as I say, there's no indication of it in the Wylex docs I have. The CU, other than this switch, is not limited.
It is a fact, though, that many many of these units had cooker ccts installed right from the start - fused as this OP's is. If you had been called to this OP's house to disconnect the old cooker and connect his new, would you have refused to do it? Would you have disconnected the existing cooker and left it disconnected for the reasons you give above?
It would not have been any less safe or compliant after the new cooker had been installed than before - or indeed, in any way, unsafe, IMVHO, but I will confirm with Wylex and post their reply asap (even if it proves me to have been talking OOMA).
