From: moroney@world.std.spaamtrap.com   
      
   On 10/14/2019 4:33 PM, Terry Casey wrote:   
   > 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.   
   >   
      
   Out of curiosity, what is the typical maximum distance from the   
   transformer to the most distant residence?   
      
   Here in the US, because of the lower voltage (for most things), they   
   usually won't go more than 1 or 2 pole spans before the drop to the   
   house, and many newer setups sometimes have a transformer for every   
   house. This is for above ground installations, I can't tell about   
   underground (most newer neighborhoods) other than how many transformer   
   boxes there are along the street.   
      
   I have seen, however, older neighborhoods with as many as 12 houses on a   
   single transformer, including our summer place. Originally all places   
   had 60A service. Bad light blinking. The fact that the primary is only   
   4800 V delta doesn't help.   
      
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