RE: Single vs Two Phase (was - Spark gap erosion resistance)

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


Richard -

The two phases in the standard utility 3 phase Y system are 120 degrees
apart. The two phases in the standard utility delta system are 60 degrees
apart. There are no utilities using the old two phase 90 degree system. Call
your utility and ask to talk to an EE, not a salesman.

John Couture

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-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, January 05, 2002 7:18 AM
To: tesla-at-pupman-dot-com
Subject: RE: Single vs Two Phase (was - Spark gap erosion resistance)


Original poster: "Wall Richard Wayne by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <rwall-at-ix-dot-netcom-dot-com>

John.

Sorry, but standard 220 vac comes in both two and three phases from the
electrical utilities.  The two phase system is 180 degrees apart and three
phase of course is 120 degrees apart in phase.

RWW
>
> Terry -
>
> I think you will find that your electric utility would consider yours as a
> 120/240 volt single phase system. A two phase system has the phases at 90
> degrees not 180. A two phase motor would be self starting without the
> additional help a single phase motor requires. There are no utilities
using
> the two phase system anymore.
>
> John Couture