Thanks for the advice so far. I now have a local qualified electrician engaged with this and an installation plan for TT earth at the hot tub and suitable cascaded RCD protection with selectivity at the supply end.
Out of interest, how would you usually achieve complete isolation of the two earthing systems at the isolator? In this case would the only incoming earth from the supply be via the armour of the SWA?
Out of interest, how would you usually achieve complete isolation of the two earthing systems at the isolator? In this case would the only incoming earth from the supply be via the armour of the SWA?
