Scott,
I think you're getting mixed up with the European designations: It is the IT system which has the supply floating, and apparently is used in parts of Norway.
The TT system, however, still has the neutral on the wye supply grounded. In fact in the U.K. the electricity supply regulations have required all LV public supplies to have one pole solidly grounded since about 1930.
Where TT differs from American practice is that the main ground busbar at the house has no bond to the neutral -- It is grounded solely to a local rod.
U.K. Supply Systems -- Diagram #3.
[This message has been edited by pauluk (edited 07-23-2003).]
