From: arl_123234@hotmail.com   
      
   On 06/21/2016 11:21 AM, gfretwell@aol.com wrote:   
      
   > The typical distribution in SW Florida is ~13kv wye connected with 3   
   > phases on the main routes and a single phase going down residential   
   > streets. I know they use delta distribution in other places with  all   
   > 3 phases going down the streets and the transformers tap 2 of them. I   
   > assume that is what you are seeing. They pick up the ground at the   
   > secondary of the transformer and again at the service entrance to the   
   > home. Can you get a picture of a transformer?   
   >   
      
   Hello, and if you Google images on 2-bushing distribution transformers   
   you'll see a number of examples.  Other than the additional HV insulator   
   they have the same footprint as a one-bushing transformer of equivalent   
   power handling capability.  Of course you can still use a 2-bushing   
   transformer with the HV bushings connected line-neutral as long as the   
   transformer HV side is designed for the correct MV distribution voltage.   
     Most of the time these days (at least in the U.S.) you don't see a   
   single MV-to-LV transformer connected line-line (as opposed to   
   line-neutral) unless for some reason you don't have a neutral to connect to.   
      
   Incidentally, in the suburb of metro Washington DC where I reside, the   
   above ground 4-wire MV distribution uses 34.5 kV line-line, 19.9 kV   
   line-neutral.  I think this is near the practical (safe?) limit for   
   line-line MV distribution voltage level.  Sincerely,   
      
   --   
   J. B. Wood	            e-mail: arl_123234@hotmail.com   
      
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