On Thu, 01 Feb 2007 22:07:32 -0500, wrote:

On Thu, 01 Feb 2007 12:39:16 -0600, Mark Lloyd
wrote:

On Wed, 31 Jan 2007 23:11:50 -0500, wrote:


Just to be sure we're still talking about the same thing, it's AC from
a center-tapped transformer secondary with the center tap grounded?

Are you using a definition of "phase" that DOESN'T apply to the
120/240VAC electrical system? What it that definition?

There is only one secondary winding so it is single phase. The center
tap does not change that.

Yes, there is one winding. That doesn't keep the reference point (for
measuring voltages) from being in the middle (center tap), and
different phases being measurable depending on which end of that
winding you measure at.

The center tap is actually in the center, meaning the voltage will be
the same which ever end you measure. What is different if not phase?
If nothing was different, you could put a wire between those points
(the ends of the winding) and have no current flow (so your 240V
appliances couldn't be working).
--
Mark Lloyd
http://notstupid.laughingsquid.com

"Unlike biological evolution. 'intelligent design' is
not a genuine scientific theory and, therefore, has
no place in the curriculum of our nation's public
school classes." -- Ted Kennedy