On Sat, 5 Mar 2005 10:07:03 -0500, "Tom Holden"
wrote:

"Gary S." Idontwantspam@net wrote in message
.. .
On Sat, 5 Mar 2005 16:37:28 +0200, "asta" wrote:

hi!
i've always wondered what phase-shift there is between those two 110V
lines
in an USA 220V AC net system.
There cannot be any, as they come off the same transformer.

Actually, the lines are opposite phase (180 degrees), 110 VAC RMS relative
to neutral/ground. If they were the same phase, then your 220V appliances
would see 0V.

My bad.

I don't really think of 180 as a phase shift, as much as a reverse
polarity.

Of course, both are true.

The three wire supply coming into the house is pretty standard in the
US residential electrical service, with +120/neutral/-120.

Happy trails,
Gary (net.yogi.bear)
--
At the 51st percentile of ursine intelligence

Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom