In uk.d-i-y, DeeBee wrote:

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

[ ... ]

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.


The Regs allow you, sensibly, to treat the hob + oven as comprising a
single cooking appliance, to which you apply standard Domestick diversity
rules for a cooker. The combined Hamperage from your ratings is 45A.
The Diversity allowance for domestic use is "10A + 30% of the rest
+5A if you've a socket on the control panel". In your case, ass-U-ming no
such socket, the diversity-corrected load is (10 + 35*0.3) = 20.5A.
Thus it's well within Regs to use a single circuit, with a 32A MCB,
wired in 6mmsq as far as the switch (4mmsq kind-of OK on short run without
thermal insulation, but don't arse about, use 6mmsq). From the DP switch
make the connections to the hob and oven in 2.5mmsq if you already have it,
or 4mmsq if you're buying new (might as well allow for the odd Christmas
lunch peak load).

I do hope your hobnoven come with thermally resistant oversleeving for the
L and N conductors where they're connecting in to the hob, though - it
does get warm in these appliances (no s**t Sherlock ;-) and plain PVC
gets soft and less useful at higher temps (70C upwards is the usual guide)...

HTH - Stefek