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

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

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> 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

	WRONG AGAIN.  The normal resedential installation is a three-wire,
SINGLE-PHASE system.  (In effect, a center-tapped single-phase system.) 
A true two-phase system has voltages which are 90 degrees apart. This
definition has used since at least Tesla's time, and probably earlier.

Ed