On 30/08/2020 11:40, Graham. wrote:

6mm. Use 2.5mm to the socket, no fused spur unit required


Disclaimer, IANAE, one will be along in a moment to mark my work.
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On second thoughts the MCB is 20A so you will need a fuse with a
2.5mm spur. WTF is Adam?


No fuse needed as the overload protection is provided by the load on the
socket.

So in theory no different to a 2.5mm unfused spur off a 32A (2.5mm) ring
or 32A (4mm) radial socket circuit.

18th edition demands that the socket is RCD protected and the oven
circuit may not be.

--
Adam