You need to check with the maker of the cable to see what csa the armour on his cable is unless you can track down the minimum specified by BS 5467 or 6346 and use that figure.
I knew the info was there, (honest), but I thought it was generic, from a manufacturer, not based on the actual requirements for armour csa in the BSs. It was only when I thought "ooh - that's handy, that table uses the BS data, I'll update the Wiki" that I realised.
Related:
So what if there was a piece of 16.0mm sq 6491X off an earth tag at each end? What would be your recorded earthing conductor size?
The copper or the steel?
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