| danny burstein 2006-01-22, 9:21 pm |
| In <qdp7t11adhodhlqcv1m6h58k2h55rbmmj5@4ax.com> clare at snyder.on.ca writes:
[ snip ]
>But 208 is ONLY found in industrial or large commercial installations.
>Virtually no residential supplies are derived from 3 phase. Most 3
>phase derived supplies to single phase loads are "upped" by
>transformers (buck/boost or full isolation) to the standard 115 or
>230.
It's most assuredly not uncommon in residential settings
in NYC. I'm in an apt building right now... which uses
the "skipover" arrangement I mentioned in another post.
Basically, all three phases come into the basement, and
the apartments get two legs and neutral (and a safety ground).
The first apartment gets A and B, the second gets B and C,
the third gets A and C. Rinse, lather, repeat.
(All three legs go to the large common equipment such
as the elevator motors, maybe the water pumps, and
central air conditioning units).
This way each apartment can get 120V, and can put
two legs together for 208V (in place of 240v).
I've learned, through hard experience, the importance
of checking what the high voltage line is
actually providing... (208V is usally, but most
certainly NOT always, an acceptable substitute
for 240V).
--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
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