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So I could join the SWA into a IP65 rated box and attach a banjo, nut and cpc to Earth the SWA?The right hand side of your board with the lighting MCBs isn't RCD protected and the blank will be a spare way- so subject to a decent Ze you could simply fit an additional matching MCB for the new SWA, but it will have to be glanded properly, possibly into a small metal enclosure to ensure the armour is earthed. EDIT= Ah I've just seen your post stating T&E for the first part of the run, so the SWA can be glanded into a weatherproof enclosure with an earthing nut and lead to the CPCs.