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.
