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.

here we have either one phase of 230V or then 3 phase
with 120 degrees between the phases.
230V between phase to ground or 400V (third root of 3 times 230V of course)
between phases

everyone has direct 3-phase system with 230V to ground in every apartment or
house splitted up to equal load on the phases.

There cannot be any, as they come off the same transformer.

A few appliances in most houses use the full 220 VAC, such as electric
heat, clothes dryer, electric range or oven, so there cannot be a
phase differential.

Industrial electrical installations are a different thing entirely,
even if they come off the same grid and substations as nearby
residential areas. IIRC, power comes to the substation as 480 3 phase,
and it is what happens after that varies between residential and
serious industrial.

Many electricians here do little industrial electrical work after
their testing and concntrae on homes, and there are a few who
specialize in industrial work.

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

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

"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.

Tom

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

On Sat, 05 Mar 2005 14:53:04 GMT, Gary S. Idontwantspam@net wrote:

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.

The phase shift in the Western hemisphere residential power
distribution system is 180 degrees, since the system is basically a
single phase system, with a 2x110 V secondary, with the centre tap
grounded.

The rest of the world is using some three phase systems for
residential distribution, either 127/220 or 230/400 V.

Paul OH3LWR

hi!
thanks a lot for the info.
it clarified someting i've been wondering for a while.
actually i had come to the same result by myself, just wanted a confirmation

cheers,
ab

"Paul Keinanen"
On Sat, 05 Mar 2005 14:53:04 GMT, Gary S.
On Sat, 5 Mar 2005 16:37:28 +0200, "asta"
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.

The phase shift in the Western hemisphere residential power
distribution system is 180 degrees, since the system is basically a
single phase system, with a 2x110 V secondary, with the centre tap
grounded.

The rest of the world is using some three phase systems for
residential distribution, either 127/220 or 230/400 V.

Paul OH3LWR