"Andy Wade" wrote in message
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I would very strongly discourage the 4-core SWA approach here, because its
unconventional nature could be quite dangerous for the unwary. Using two
2-core SWAs will bolster up the armour CSA nicely too.


I think the opposite is true from the point of view of CSA size. 4 core SWA
meets the Cu equivalent of 10mm2 from 4mm2 cables upwards whereas with 2
core cables you need to be using 10mm2 cable before the Cu equivalent hits
10mm2. (I am assuming you might want the SWA to act as main equipotential
bonding).
See http://www.earthingnuts.co.uk/pdf/pvc_xlpe.pdf

Unconventional is not necessarily unsafe. Labels and diagrams......

Regards
Bruce