Maybe you should re-examine the facts and not trust everything a telephone jockey has told you who is probably in India too.
I'm not trusting everything I'm told on the telephone. I'm using my common sense, intelligence and knowledge without listening to old wives tales.
If there are no exposed or extraneous conductive parts in an outbuilding, then there is nothing wrong with running 6mm 3-core SWA to it, using one core as the circuit protective conductor.
Nothing in the regs, the EAWR or anywhere else says that you can't! - regardless of the earthing system.
What do you think is going to happen with a loss of supply neutral - nothing - the current will flow down you water and gas pipes.
And if you haven't got these, then it isn't going antwhere, is it?
Are you really trying to tell me that if you have an
attached garage, and you run an SWA cable for power and lighting to it, straight through the wall of your house, that it is any different if that garage is moved three metres away from the house and becomes
detached.
As I said earlier, it's extraneous conductive parts that make the difference - and that still wouldn't mean you couldn't, it just means you have to consider the size of the bonding CSA, depending on the distance from the MET to the outbuilding - could end up something like 16mm, then you can't use your 6mm 3-core.
Those are
the facts.
