From: gtaylor@tnetconsulting.net   
      
   On 1/26/20 3:49 PM, Michael Moroney wrote:   
   > Yup. For old timers...   
      
   :-)   
      
   > Probably just to get more power through a circuit by changing one   
   > big transformer upstream. Not enough of a change to need to upgrade   
   > insulators etc.  Maybe.   
      
   *nod*   
      
   > It's trig that had to be done just once.  Anyway, draw a triangle with   
   > 2 sides 120 (volts) long and the angle between them 120 degrees. Find   
   > the length of the third side.   
      
   I'm starting to re-watch some videos on 3ɸ on MathTutorDVD.com, and I'm   
   seeing a reference to ± 30° in combination with the √3.  So I suspect   
   there is more to this particular discrepancy.  I'll respond with more later.   
      
   > (if you split the third side in half and draw a line from the midpoint   
   > to the vertex with the 120 degree angle, you produce two standard   
   > 30-80-90 right triangles if that's easier for you.)   
      
   Did you mean 30° / 60° / 90°?   
      
   30 + 80 + 90 = 200° ≠ 180° that all triangles that I know of add up to.   
      
   It sounds like you might be talking about a phasor.  But I don't think   
   I'm correctly unpacking what you're talking about.   
      
   > It's the standard notation you'll see in specifications/instructions   
   > etc.   
      
   Thank you for explaining.   
      
      
      
   --   
   Grant. . . .   
   unix || die   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)