XPost: alt.home.repair   
   From: null@void.com   
      
   On 12/3/2013 11:58 AM, Andrew Gabriel wrote:   
   > In article<529e1008$0$49510$c3e8da3$fdf4f6af@news.astraweb.com>,   
   > 	bud--  writes:   
   >> 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"?   
   >   
   > In maths/physics, you have two phases with a mathematical   
   > relationship of -x (or a 180 deg phase shift).   
   >   
   > In electrical distribution, two-phase is a specific jargon term   
   > which means something else.   
   >   
   > There's no one right answer - it depends on the context of the   
   > discussion.   
   >   
      
   The context is, specifically, in US power distribution is a split-phase   
   supply called 2 phase with a phase A and phase B.   
      
   (Not "2-phase", which as you say is rather different.)   
      
   I don't think you have much split-phase over the pond. If I remember   
   right, construction sites may have 120/60V circuits.   
      
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