17th edition and Tri rated cable

[stuartturbo]

I'll just stick to industrial seems easier LOL
and standard accepted wiring.

On the who can do it, i will post back in the new year after Building regs first visit. Then proceed from there after getting costs

 

[ban-all-sheds]

I'll just stick to industrial seems easier LOL.

You still need to understand Ohm's Law, voltage drop, how installation methods affect current carrying capacity, how temperature affects resistance etc.

None of the things you have got wrong here are due to the proposed work being in a house rather than a factory, they are due to lack of fundamental knowledge on your part.