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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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    EV chargers were not discussed when I did the 16th Edition course.


    If you are installing an EV charger with TT earthing just for the charger to create a TT island and the 32 amp charger is supplied by 6 mm cable, what size does it’s earth conductor need to be?
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  • 0
    EV chargers were not discussed when I did the 16th Edition course.


    If you are installing an EV charger with TT earthing just for the charger to create a TT island and the 32 amp charger is supplied by 6 mm cable, what size does it’s earth conductor need to be?
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