humm 0.35 is poor & high! I get 70mm by the skin of my teeth on cablecalc but 95mm on other software so I would be looking at 95mm. I would also be looking at trying to get that ze down.
You did say BS88 63a with 60a load and 180m
It says that if you can't meet the requirements you can still use TN system if its a dwelling. The code of practice goes on to say that there are way to help reduce the touch voltage as getting the required low Ra is unlikely. I'm not saying it does not happen but how many open circuit PEN...
20 amp should be fine supplying your 16amp socket as you say its covered in OSG part H3.
Out of interest have you hit mainly drains installing your earth rods for your EV chargers ?
The Department for Environment, Food and Rural Affairs (defra) tell you in there "Code of Practice for the Welfare of Horses, Ponies, Donkeys and their Hybrids" that your electrical installation should be installed/maintained and tested to current BS7671.
Part P has nothing to do with what you...
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