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flex size connecting multiple ovens

wallywombat
The existing cooker circuit is 6mm² on a B40. The customer wants to replace the free-standing cooker with 2 built-in ovens and an induction hob. Will each cable from cooker outlet  to device need to be the full 6mm², (e.g HO7RN-F) or can I get away with anything smaller and more convenient (e.g. what's supplied with each oven/hob, if anything)? The final purchasing choice hasn't been made yet, so I don't know whether any of the devices will be suitable for a 13A plug/FCU, which can obviously accept a smaller cable.
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    If you use 2.5 mm2 flex (may be smaller) are the appliances capable of overloading that? Presumably not.


    Which leaves fault protection. The extra impedance of the flex will be negligible.


    Look at it another way: would the internal cables within a freestanding cooker be 6 mm2 or smaller?


    ETA: if you have three 2.5 mm2 cables, the total is greater than the 6 mm2 fixed wiring.
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    If you use 2.5 mm2 flex (may be smaller) are the appliances capable of overloading that? Presumably not.


    Which leaves fault protection. The extra impedance of the flex will be negligible.


    Look at it another way: would the internal cables within a freestanding cooker be 6 mm2 or smaller?


    ETA: if you have three 2.5 mm2 cables, the total is greater than the 6 mm2 fixed wiring.
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