Dave Plowman (News) wrote:

They tend to be the same size as those in sockets, so will take 3 x 2.5mm
cables ok.

IME, they tend to be a good deal larger than that on modern CUs... the
screw connection on the top of the MCBs tesds to be common across the
range regardless of the actuall MCB rating. Hence are usually good for a
16mm^2 cable, and the neutral bus bar will usually have at least some
locations that will take that size.

(much depends on the type/age of CU we are talking about here)

--
Cheers,

John.

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