Hi Tom,
In UK wiring systems the neutral wire (current carrying conductor) is always earthed (grounded) at the supply source by the supply co. The only systems of supply that I have ever seen here are designated:
TT (local earth rod), TN-S (separate wire or armouring back to transformer) & TNC-S (known as PME in UK, neutral & earth combined in a single conductor on the power supply side & separated in consumer's installation).
Paul posted some 1st class diagrams on these systems, recently.
Any other systems would only be permitted as privately operated systems, not connected to the public mains.
David
[This message has been edited by David UK (edited 10-05-2002).]
