XPost: rec.arts.comics.strips   
   From: tkoenig@netcologne.de   
      
   Scott Dorsey  schrieb:   
   > Thomas Koenig   wrote:   
   >>But I read upthread about 220 V (or 240 V) in the US being supplied   
   >>by having two opposite phases.  How is that generated from three   
   >>phases?  Sound weird.   
   >   
   > Center-tapped transformer.  You have your 24KV mains in three-phase   
   > but you take one phase put it into a 24KV:240VCT with the center tap   
   > as your neutral and now you have two opposing hot legs off of one phase.   
   > (This is why it's called single phase power and not two-phase power,   
   > because both legs come off the same phase of the distribution network.)   
      
   Thanks for the info.   
      
      
   > There are way more complicated tricks possible with transformers.  There   
   > is actually still 2-phase power in the US, with two phases shifted by   
   > 90 degrees.  It may still exist in Sweden too, or it did when I was a   
   > kid.  This is created from a three-phase source using the "Scott-T"   
   > transformer arrangement which is truly mindbending.  As far as I know this   
   > only still exists in Philadelphia here.   
      
   Urgh.   
      
   Having 400 V / three phases going into each household certainly   
   seems easier and cleaner... (and saves on the copper/energy loss   
   balance).   
      
   --   
   This USENET posting was made without artificial intelligence,   
   artificial impertinence, artificial arrogance, artificial stupidity,   
   artificial flavorings or artificial colorants.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)