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CSA of main earthing conductor for TT

Grumpy
Morning! Has the minimum CSA of the main earth to the rod changed in the 18th ed? I can't find any reference to it in the BBB (except when buried). 

I have a guy who is insisting on 16mm whereas I "thought" it could be much less if not buried and protected against corrosion and mechanical damage. I only have table 4.4(ii) in my 17th ed OSG as corroboration. Thanks.
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    Zoomup:

    543.1.1 allows you to go down to 4.0mm2 if certain conditions are met.


    Z.


    I get that Zoom but the man still has to do some sums and if he can't then the default appears to be 16mm. He could do with a nice numpty table like that in my 17th ed OSG!


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  • 0
    Zoomup:

    543.1.1 allows you to go down to 4.0mm2 if certain conditions are met.


    Z.


    I get that Zoom but the man still has to do some sums and if he can't then the default appears to be 16mm. He could do with a nice numpty table like that in my 17th ed OSG!


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