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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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    Unless the rod has a spectacularly low resistance to terra-firma, a bit of 2.5mm would do, so long as well protected against mechanical failure,  and this is reflected in the 18th edn  UK regs - which I do not have to hand or I;d give you the para number.

    The OSG does( or did at least) also say this.

    mike.
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    Unless the rod has a spectacularly low resistance to terra-firma, a bit of 2.5mm would do, so long as well protected against mechanical failure,  and this is reflected in the 18th edn  UK regs - which I do not have to hand or I;d give you the para number.

    The OSG does( or did at least) also say this.

    mike.
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