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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:
    Grumpy:

    Thanks both. So, are we saying that if you can't do the sums then you have to use 16mm? There isn't a definitive statement in the BBB like there was in the OSG?

    Mind you he only "presumed" the main earth was 6mm instead of 16mm so am I to assume he couldn't find one? Surely that might have been worthy of a comment, as might the presence of three electric showers, disconnection times of 0.4 and 5 seconds . . . I'm beginning to wonder if I've wasted my dollar!!


    Are those the disconnection times entered on the certificate when he has condemned the earthing?




    That’s common mistake made on TT result sheets


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    Sparkingchip:
    Grumpy:

    Thanks both. So, are we saying that if you can't do the sums then you have to use 16mm? There isn't a definitive statement in the BBB like there was in the OSG?

    Mind you he only "presumed" the main earth was 6mm instead of 16mm so am I to assume he couldn't find one? Surely that might have been worthy of a comment, as might the presence of three electric showers, disconnection times of 0.4 and 5 seconds . . . I'm beginning to wonder if I've wasted my dollar!!


    Are those the disconnection times entered on the certificate when he has condemned the earthing?




    That’s common mistake made on TT result sheets


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