In message , ARW
writes
On 19/11/2016 19:23, Andy Burns wrote:
ARW wrote:

Jack Lawson wrote:

6ft radial

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

I thought you might like to break out the adiabatic equation, until Jack
mentioned it was all within reach of the CU!


No need for all that ********.

However there is a chance that if the OP lives close to a substation
then a short circuit may destroy the MCB. That applies to all circuits
at the house.

As I was in the workshop this evening I thought I should check my claim
about my 9" angle grinder tripping the supply. Er... the MCB is in fact
a 16amp B type....


--
Tim Lamb