From: gtaylor@tnetconsulting.net   
      
   On 1/26/20 3:09 PM, Michael Moroney wrote:   
   > Nameplate voltage is 120V,   
      
   "Nameplate".  I like that.  That's very "on the tin" type description.  :-)   
      
   > sometimes I see 125V probably to say something at the "high end" is OK.   
   > My outlets are 120 or 121 volts.   
      
   The small desk side UPS beside me is saying 124 VAC.   
      
   > Ancient stuff was rated at 110 or 115 volts, many tube type radios   
   > were rated at 117 volts.  I think they increased the voltage over   
   > time in small steps.   
      
   Interesting.  I wonder why that was done.   
      
   > You'll still hear electricians or others refer to "220" (volts) as   
   > the voltage to high power devices on residental split phase connected   
   > to both hots rather than hot to neutral. It's really 240 volts.   
      
   *nod*   
      
   > 3ɸ should be 208V/120V.  For three phase, phase to phase voltage is   
   > √3 times the phase-neutral voltage.   
      
   Hum.  Now I'm going to need to go back and re-read / re-watch some   
   material that mentioned rectangular & polar coordinates to confirm how   
   they were doing things.  It seems like √3 is much simpler.  I wonder why   
   trig is coming to mind.  :-/   
      
   > Same for 480V.  It is really 480Y/277V, but 277V single phase is   
   > rarely used except for industrial lighting.   
      
   *nod*   
      
   You're writing that as ɸ-to-ɸ / ɸ-to-neutral.  Where I'm used to seeing   
   ɸ-to-neutral / ɸ-to-ɸ.  I wonder why the difference.   
      
      
      
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