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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..
it would just be good if it was easily described, looking back at the installation certs over the years, its been called TN-S TNC-S and TT but mostly TNC-S
its mostly a matter of interest for me, than any great importance. it just amuses me how much confusion it causes
and, I have had, of course, a couple of people exclaiming that 'its illegal!'
it would just be good if it was easily described, looking back at the installation certs over the years, its been called TN-S TNC-S and TT but mostly TNC-S
its mostly a matter of interest for me, than any great importance. it just amuses me how much confusion it causes
and, I have had, of course, a couple of people exclaiming that 'its illegal!'
