Hi everybody
Just to add a little more fuel to the flames! We
supplied an Instrument to a well known semiconductor Manufacturer in Oregon
which was powered from two 220 volt phases. I marked the rating plate as 220
volt one phase as has been suggested. However the local inspector made us
change it to 220 volt two phase. So what is the correct definition.
Brian Harlowe
Thermo V.G. Scientific
Tel +44 (0)1342 327211
Fax +44 (0)1342 315074
> -----Original Message-----
> From: rbus...@es.com
> Sent: 02 May 2001 21:31
> To: emc-p...@majordomo.ieee.org
> Subject: AC Power Primer?
>
>
> I am in the process of assisting our publications group with documenting
> an
> ac power configuration. As simple as this sounds, it turns out there are
> varying opinions in our engineering group regarding the naming convention
> for input power, in particular single phase verses two phase.
>
> We all probably agree that a phase to neutral connection is single phase
> and
> devices that use all thee phases, whether they are 208V 60Hz or 400V 50Hz,
> are truly three phase. The discussion heats up when you are talking about
> a
> phase to phase connection on a three phase distribution (208 or 400V). Is
> this called single phase or two phase? It has been suggested that in the
> European community it is called two phase, while in the U.S. we call it
> single phase. I am looking for opinions or discussion on this issue.
>
> On a related note in the U.S. we have 240V 60Hz (two 120V drops) coming
> into
> our into our homes. This is provided by a transformer with a center taped
> winding. On the outside legs of the transformer we have 240V but between
> either outside leg and neutral (center tap) we have 120V. I would call
> this
> a single phase system with two additive (in phase) 120V windings. Again
> others have called this two phase.
>
> My apologies to the group if this is a stupid question. Its just one of
> those nagging questions.
>
> Rick Busche
> Evans & Sutherland
> Salt Lake City, Utah
>
> rbus...@es.com
>
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