To summarise - the oven is rated at 5.18kW (22A @ 230v) (double under
counter oven) and the hob at 5.4kW (23A @ 230v).

The boss wants to have only one DP isolator above the worktop, which I agree
with, so the question is how to wire this lot in.

The oven and hob manuals state that a 30A fuse should be used with a minimum
of 4mm T&E cable.

My idea was 10mm T&E cable from the CU to the DP isolator then 6mm T&E to
two cooker outlet plates then to the appliances. The CU currently has a 32A
MCB on the cooker radial circuit, but I could change this to a 45A MCB.
However my concern is that the overall fuse is 45A, but the individual
appliances should really be 30A. Can you get fused cooker outlet plates or
something similar, or must I go for two completely separate circuits from
the CU with 32A MCBs.

This cannot be an uncommon application, but what is the best way to proceed,
with the regulations.

BTW the CU is only a few metres from the oven hob, max 4m or cable from CU
to DP switch then 1m to the appliances.

Any help greatly appreciated so I can get it done this weekend

I personally would wire two 30A supplies to two isolators.
If you wanted to hide the switches you could put them in the cupboard
at the side of the oven housing, but not right at the back where you
cant get to them. You won't need to switch them off other than
maintenance so you're not going to need to access them that often.
Also keeps both switches from being above the worktop, double happy
for the boss!
Your original way wasn't really up to scratch, the 6mm wouldn't be
protected other than by the 45A fuse, not good.
You could get 32A fuses to go by the hob & oven but you'd take up more
room than the 2 switches so would have to put them in the cupboard
next to the oven anyway, so if you have to put something in there you
may as well make it the switches, cheaper, easier and more convenient.
If the hob goes You've still got the oven, without having to take it
all out to isolate it.


SJW
A.C.S. Ltd.