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Hi - as per Pete, AC or DC?
Assuming AC, then perhaps you’re planning two phases, a neutral and an earth. In the UK the cable would need to have a circuit protective conductor travelling with the lives irrespective of the next building’s earthing design. The size of that protective conductor may increase if it also provided bonding in the new building (which it does, by the sounds).
Assuming AC, then perhaps you’re planning two phases, a neutral and an earth. In the UK the cable would need to have a circuit protective conductor travelling with the lives irrespective of the next building’s earthing design. The size of that protective conductor may increase if it also provided bonding in the new building (which it does, by the sounds).