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UK Swa as main earth ?!?

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Discuss Swa as main earth ?!? in the UK Electrical Forum area at ElectriciansForums.net

I'm making a lot of assumptions, but if 100A is a sufficient max demand total for the 3 properties (eyebrow raised a bit), volt drop is ok, the CPC is sized by calculation for ADS of the switched fuse and you proceed as you suggest to make this distribution circuit TT the far end so each property is not connected to a PME supply....
..then my understanding is that you need to be above half the distribution circuit's calculated CPC size to support bonding within that building.
(I've got concerns that this hasn't been sufficiently planned, you've inherited a mess and someone else's attempts at a plan, along with a customer not wanting to spend money, and it sounds as though a 3ph supply should have been considered.)
 
westward10 said:
What is 25.0, the tails from the head?
What size earthing conductor is installed from the head?
Click to expand...
This is what Ive got supply end straight into the swa. Earth is 16mm
[ElectriciansForums.net] Swa as main earth ?!?
 
Judging by the supply cable I doubt your main protective bonds need to be above 10.0 and if that cable is 120.0 it's armour will support 10.0.
 
westward10 said:
If it becomes TT the distribution cpc is not relevant.
Click to expand...
Obviously it's electrically irrelevant and I'm not trying to pick an argument that flies in the face of common sense....

Thing is, I've never found anything in the regs to specifically say how to size bonding in a separate building that becomes TT at point of entry.
541.1.1 seems to make no distinction for TT, just PME or non-PME, and the line about separate buildings.
Is there another section somewhere that is relevant ? Or is it just one for common sense?
Thanks.
 
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