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Its part of the reason, but the main contributor was the current carrying capacity, Knowing what lighning is capable of I would always where possible use 6mm and if a bath is fitted, use a proper cast iron one, faraday cage, much safer.
WTF??
Please quote me, from recognised documents, anything you feel will support your odd theories.
Never mind 6mm² for supp bonding, shouldn't we be using lightning conductors?
And maybe upgrade the 16mm² main earthing conductor to 95mm²? After all, knowing what lightning is capable of...