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What earthing arrangement is this?
Former Community Member
The supply is from a private transformer in a four core cable 3ph + n. The cable armour is earthed and connected to the MET. However there is also a green and yellow cable connected to the neutral terminal at the main isolator going back to a the transformer casing. The transformer is only 5 or 6 metres away. I think this must have been intended to make it a tncs supply but seems to me to just create parallel neutral conductors. Or is it tn-s-c-s? I have only been able to go off visual inspection because I could not disconnect the supply..
No we are not - the wiring within the transformer is just as much at phase or neutral voltage as the wiring outside. Of course the voltage changes each time it links round the core flux, but it is still an integral part of the circuit.
No we are not - the wiring within the transformer is just as much at phase or neutral voltage as the wiring outside. Of course the voltage changes each time it links round the core flux, but it is still an integral part of the circuit.
