From: arl_123234@hotmail.com   
      
   On 04/24/2017 01:22 AM, Michael Moroney wrote:   
   > In Philadelphia, the electrical distribution system has many   
   > configurations similar to these:   
   >   
   > https://goo.gl/maps/CFTdNYGoY9F2   
   > https://goo.gl/maps/v9BmSQwtUWF2   
   >   
   > Two transformer cans on a pole. Notice the small lower one doesn't have   
   > any MV connections or even any MV bushings.  The two cans appear to be   
   > connected as the second link shows.  Sometimes the small can appears by   
   > itself on poles with no MV wiring whatsoever.   
   >   
   > https://goo.gl/maps/nfYPmaNk4242   
   >   
   > The small cans appear to have four lugs (and no MV bushings).  Does anyone   
   > know what they are and what their purpose is? These are densely populated   
   > urban residential areas mostly with smaller commercial businesses.   
   >   
   Hello, and it's hard to tell from the photo refs you provided.   
   Sometimes the MV bushings on pole-mounted distribution transformers are   
   mounted on the sides of the can.  Also, a single MV terminal on the top   
   of the can (typical for MV line-to-neutral connection) might not be   
   visible in the photos.  Like you, I get curious when wiring practice   
   doesn't at first appear to follow the 3-phase, 4-wire, multigrounded   
   neutral MV distribution system used over most of the U.S.  Sincerely,   
      
   --   
   J. B. Wood	            e-mail: arl_123234@hotmail.com   
      
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