On Sat, 19 Nov 2016 14:10:54 +0000, 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!


cheers