Indeed the whole subject of insulation between Earthing systems seems rather lacking.
I agree, there are a few areas the regs and guidance are bit funny about, and that is certainly one.
(Another is the requirement to use large bonding cables even to things that are incapable by dint of the electrode resistance of carrying a large current, unless you decide it is the main electrode and then it can be less) .
But personally I like a large plastic stuffing gland into a plastic box at the load end if creating a TT island, rather than trying to fit heatshink over cut back armour.
Indeed the whole subject of insulation between Earthing systems seems rather lacking.
I agree, there are a few areas the regs and guidance are bit funny about, and that is certainly one.
(Another is the requirement to use large bonding cables even to things that are incapable by dint of the electrode resistance of carrying a large current, unless you decide it is the main electrode and then it can be less) .
But personally I like a large plastic stuffing gland into a plastic box at the load end if creating a TT island, rather than trying to fit heatshink over cut back armour.
