In California this is a moot point as they have run out of electricity :)
> OK, I just have to get my two cents in regarding electrical services
>in
>the U.S.
> There are still quite a few 120 volt, single phase residential
>services
>in use that have never been converted to 240 volts. 240 volt single phase
>is
>the most common residential service, but there is no standard amperage.
> 208/120 volt, 3 phase is commonly used for small commercial buildings.
> 480/277 volt, 3 phase is commonly used for medium to large commercial
>buildings.
> 240/120 volt, 3 phase services are delta systems with a 210 volt
>stinger
>leg. These are occasionally found in old commercial or industrial buildings
>in my area, but the local utility is gradually phasing these out. The
>stinger leg can be used on 240 volt, 3 phase loads, or on 208 volt, single
>phase loads when accompanied by the neutral conductor.
> Higher voltages are frequently used in large facilities or campuses,
>and
>many other types of systems are used for the specific needs of
>manufacturing
>facilities, but these should be of no interest to hams.
>
>Jim Smith, KQ6UV
>
>
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