The Main-Earth-Neutral system that Trumpy talked about is equivalent to British PME. It's diagram #2 in the
U.K. Power thread.
Nick revised the CAD drawings a few weeks ago to add the appropriate TN and TT designations which I didn't include on the originals.
Basically, MEN/PME is the same as standard American practice where the neutral is bonded to ground at the service entrance, although as you can see in the diagram, the exact point of bonding varies. In the European/International coding system, a normal U.S. supply would be classified as TN-C-S.
