From: k.type@example.invalid   
      
   In article ,   
   gtaylor@tnetconsulting.net says...   
   >   
   > My limited understanding agrees.  The typical home in the U.S. (I don't   
   > know about elsewhere in the world) is feed by a single phase to a   
   > transformer with a center tap that is grounded, and each of side in   
   > relation to the center tap is what I believe is called a "leg".   
   >   
      
   In Europe, distribution is a 3 phase 4-wire system.   
      
   Volage in the UK used to be 240V between any phase and neutral   
   and 415V 3-phase.   
      
   Residential areas are usual connected so that a small number   
   of homes (which could be as low as 1) is fed 240V on a single   
   phase, the next home(s) are fed from a 2nd phase, the next   
   from the 3rd phase and then the sequence repeats. This ensures   
   that the loading on all phases is reasonabl balanced.   
      
   Heavy industrial users would have 415V 3-phase supplies.   
      
   Europe had 220V/380V supplies but from 2003, European voltages   
   have been harmonized at 230V/400V although the tolerances on   
   these voltages mean that virtually nothing has changed.   
      
   --   
      
   Terry   
      
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