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Hi guys,
Just wondering if anyone can clear up an issue.
On tncs earthing systems, can you calculate the size of the main earth?
I thought you could but main bonding conductors have to be sized to the neutral.
Just had a conversation with another electrician and he said it has to be 16mm for main earth for tncs and showed me the onsite guide. But I was under the impression in regs book it says that all earth conductors need to be either selected or calculated except from bonding conductors which for tncs need to be sized according to the neutral, and on tns bonding conductors need to be sized at least half of the main earth but no smaller than 6mm? Just wonder if you can calc main earth really, just made me doubt myself and thought I would get the opinions of others.
Cheers.
Cheers
 
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