I read in !emc-pstc that Price, Ed <ed.pr...@cubic.com> wrote (in
<b78135310217d511907c0090273f5190d0b...@curly.ds.cubic.com>) about '2
Phases in North America', on Thu, 13 Dec 2001:
>    At this point, you still have a single-phase system. The voltage is 
>    240 Vrms, from one "hot" line to the other. The voltage from each 
>    hot line to neutral (and ground) is 120 Vrms. 

Well, you can also look at it as a two-phase system with 180 degrees
between phases. But since the load is very rarely balanced, so the
neutral is normally a current-carrying conductor, it doesn't really meet
the criteria of a poly-phase system.
-- 
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk 
After swimming across the Hellespont, I felt like a Hero. 

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