From: null@void.com   
      
   On 2/20/2014 7:54 PM, Tom Horne wrote:   
   > On Tuesday, December 3, 2013 12:07:05 PM UTC-5, bud-- wrote:   
   >> On 12/3/2013 8:25 AM, trader4 optonline.net wrote:   
   >>>   
   >>> And I'm still waiting for an answer why a system with   
   >>> two phases that differ by 90 deg is acknowledged by everyone to have two   
   >>> phases.  If they differ by 240 deg, that's two phase right?  If they   
   >>> differ by 170 deg, that must be two phases, right?  So, what magically   
   >>> happens when they differ by 180 deg that suddenly there are no longer two   
   >>> phases?   And how do the electrons know?   
   >>>   
   >>   
   >> For a garden variety split-phase supply (240/120V from a transformer   
   >> with a centertap) are there 2 "phases"?   
   >   
   > If you only have one phase supply to the transformer how can you get a two   
   > phase output.  If I put a multi tap transformer on that pole do I get a   
   > multiphase output?   
      
   The argument (at a.h.r, which was in an original crosspost) is that   
   there are 2 "phases" (leg A and leg B) (but not that it is "2-phase").   
      
   IMHO it is silly to talk about 2 voltage phases when trivially one is   
   the negative of the other. IMHO it can also lead to confusion. I don't   
   think anyone (except maybe you) clearly said one or the other was correct.   
      
   Nice to see you around once in a while.   
      
   >   
   > What about three phase, high leg delta were one of the transformers is   
   > up sized to carry the 120 volt loads and there are three ungrounded current   
   > carrying conductors off the secondary.  I suppose someone is going to   
   > argue that is four phase.   
   >   
   > --   
   > Tom   
   >   
      
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