Re: IS 240VAC two-phase - NO

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: dhmccauley-at-spacecatlighting-dot-com 

 > >240VAC is correctly denoted as SPLIT single phase.  It is NOT two phase.
 > >
 > >It is simply a centertapped, 240VAC single phase line from a single phase
 > >transformer.
 > >
 > >
 > >Dan
 > >
 > >
 > >
 > >Two phase denotes a phase angle difference of 180 degrees. The sum of all
 > >phases in any system must always equal 360 degrees. The standard home
 > >electrical system in the US is two phase, 180 degree difference( two
times
 > >180 equals 360). Each phase is 125 volts RMS to neutral, and 250 volts
RMS
 > >from phase to phase.
 > >
 > >allan
 > >
 >
 > weird....
 >
 > when testing the house wiring with my O-scope ..  the 120V shows a single
 > sine wave ...   when testing the 240 system it shows 2 sine waves ( had to
 > use both leads)
 >
 > so how does a single phase get "split" via a center tap transformer to
 > produce the opposed phases ???
 >
 > Scot D

Its just a center-tap winding with NEUTRAL tied to the center tap.  Just
like the output of a simple filament transformer.
Draw the circuit and you'll immediately see why this is.

Dan