On 01/02/2020 09:46, PeterC wrote:
On Sat, 1 Feb 2020 01:28:25 +0000, John Rumm wrote:

On 31/01/2020 16:34, Fredxx wrote:
On 31/01/2020 15:56:05, John Rumm wrote:
On 31/01/2020 14:58, Gareth Evans wrote:

I'm fairly sure that when this house was rewired that the cable
from the consumer unit to the cooker point was 6mm, but
recent discussion here has discussed 10mm and even 16mm.

Has the standard changed over the years?

There is probably a wider availability of more powerful cookers (or
hob / oven combinations) than in the past.

I would have said quite the opposite. It's quite common for an oven to
be low enough power to use a standard plug.

True, but its not usually the oven that is the main load with separate
components. Hobs with a maximum demand of 7kW are not uncommon. Whereas
that would have been very high for a complete "electric cooker" of the 70's

I've a Belling that was given to me in early '80s; it had 4x2kW radiant
rings on the hob. One is now 1100W. I rarely use more than one at a time -
just as well, as it's on a 30A MCB.
The cable isn't all that long and is in mini-trunking and above the ceiling,
so I could get away with a 40A MCB.
It has a standard oven and two grill elements, so the whole load is over 40A
by a bit.

So if you assume a max load of 40A and apply diversity - take 10A of the
actual load, then 30% of the remainder you get 10 + 0.3 x 30 = 19A, So
in reality a 32A circuit will be fine. (a 32A MCB will likely carry 40A
indefinitely[1])


[1] http://wiki.diyfaq.org.uk/images/d/d...e-MCBTypeB.png






--
Cheers,

John.

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