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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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    Sparkingchip:

    I used 10 mm last week, not because it needs to be that big but it looks the part. Without looking in the book I would say 2.5 mm would have been okay.


    I agree Andy, I always use 10mm. To me, stating that 16mm is required and a C2 undermines his credibility. As do the wrong disconnection times.


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    Sparkingchip:

    I used 10 mm last week, not because it needs to be that big but it looks the part. Without looking in the book I would say 2.5 mm would have been okay.


    I agree Andy, I always use 10mm. To me, stating that 16mm is required and a C2 undermines his credibility. As do the wrong disconnection times.


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