Kayos
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I know nothing about that subject so cannot comment.
However, as I stated, manufacturers instructions don't overpower BS7671. Manufacturers instructions must be taken in to account.
That was one specific example, manufacturers must take the British Standard into account but they always over rule them


I hate seeing folks coiling it by winding over hand and elbow so it twists into a figure of 8, similar pulling cable/wire over the side of the drum instead of unrolling it.