This is a good exercise as it has made me revisit those darned confusing tables.
Now I see them in a second light and it's all fallen into place.
If you use single core cables inside of conduit instead of a multicore cable, as you said you were going to install conduit, then your rating changes.
The rating for a 6mm single core cable, installation method two, becomes 41 amps. Table 6.2(a)
Normally the conduit and Flexi conduit will run from the distribution board into the oven and the rest of it is joined together with internal cables which usually have those heat-resistant cables and plugs.
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