Note that the OSG has a table of rule-of-thumb calculations for diversity, including one for cooking appliances. On a cooker, even if all rings are used, once the pans on them have come to the boil, they will likely be turned down considerably. Similarly, once the oven set temperature has been reached, the heating element gets turned off for a while. So a multi-thinggy oven is a good candidate for applying diversity.

A short-term overload is perfectly acceptable, hence why the OL part of an MCB is a bi-metallic strip that gradually warms up, crudely mimicking the behaviour of the overloaded cable warming up.

The thing about diversity is that it's a guess about likely usage patterns, in order to avoid hugely over-engineering everything. So, if diversity is done correctly, the worst that should happen is something tripping if you guessed wrong. If it trips frequently, the customer may need to upgrade the wiring. What should never happen is that  if you guessed wrong, the cable overheats or something sets on fire.

Or to put it another way, diversity is a gamble with convenience, but never a gamble with safety.

Note that the OSG has a table of rule-of-thumb calculations for diversity, including one for cooking appliances. On a cooker, even if all rings are used, once the pans on them have come to the boil, they will likely be turned down considerably. Similarly, once the oven set temperature has been reached, the heating element gets turned off for a while. So a multi-thinggy oven is a good candidate for applying diversity.

A short-term overload is perfectly acceptable, hence why the OL part of an MCB is a bi-metallic strip that gradually warms up, crudely mimicking the behaviour of the overloaded cable warming up.

The thing about diversity is that it's a guess about likely usage patterns, in order to avoid hugely over-engineering everything. So, if diversity is done correctly, the worst that should happen is something tripping if you guessed wrong. If it trips frequently, the customer may need to upgrade the wiring. What should never happen is that  if you guessed wrong, the cable overheats or something sets on fire.

Or to put it another way, diversity is a gamble with convenience, but never a gamble with safety.