On 19/11/2016 14:10, Andy Burns wrote:
Jack Lawson wrote:

6ft radial

For a 20A type C MCB, the maximum Zs is 1.15 ohms to ensure 0.4s trip
time, I think it's fair to say 6' of 2.5mm^s cable meets that
comfortably, 60 metres would be getting marginal!


A 16A or 20A C type type will be OK with that sort of run. No
calculations are needed.

A 32A B type will also be OK and will have the added advantage that it
will annoy dennis.



--
Adam