how to upgrade the earthing conductor?

[SimpleSimon]

No no I understand. And I also understand why British Gas weren't happy installing with that behind it and personally I'm happy to upgrade it, also because DNO are going to change it to a PME.

 

[pushrod]

i may be inaccurate here, but theoretically the protective device, usually a 1361, will blow long before the fault current gets anywhere near it's rated breaking capacity of 16kA. it's a very rare occurence for a fault current to develop upstream of the circuit protective devices, although not unknown.

BS 1361s have a breaking capacity of 16.5 or 33kA depending on type. Think you might be thinking of the fact that if you have a CU to BS 5486 or BSEN 60439 then the enclosure is rated to withstand high PFCs and you can then record max short circuit capacity as 16kA if you have a BS1361 or BS88 (less than 100A)
I was just making the point that if someone is thinking "oh i'll upgrade the earthing" without full consideration, especially if they have older style CBs or BS3036s, which certainly won't be in such a CU, then they could be opening a can of worms as their short circuit capacity could well be 1, 2, or 3kA.

Must admit i only glanced thru the thread so don't know the full details as to whether a CU upgrade was being considered as well.