Chuck Guzis wrote:
On 11/25/2014 12:17 PM, Eric Smith wrote:
On the other hand, distributing three-phase to
residences, while great
for people with shop equipment or old computers, seems like expensive
overkill for normal homes.
And expensive. Copper isn't cheap and a 3-phase distribution
transformer costs considerably more than a single-phase one--and
provides very little advantage.
Maybe that's the case where you live, but nor here b'cause of production
Where is the advantage of two thicker wires fingle phase against four
smaller ones? If you are happy with that was NA suppliers give to you
congatulations, but all others that know better must not be happy with
I'll submit that if your goal is phase-to-phase balancing, distributing
single-phase to individual residences and then shifting the residences
to one phase or the other is probably better in that respect. In
Germany, ordinary wall receptacles are single-phase, so depending on the
homeowner to phase-balance his load is probably not the best policy. On
the other hand, doing the same for multi-residence (i.e. apartment
blocks) does make sense.
As I wrote before: Do you really think over there that all people in
Countries that aren't part of the US are some sort of Idiots?
I'm a German, are German Engeneeers stupid too?
The homes on my loop (each has its own single-phase stepdown
transformer, but the loop itself is fed by 3-phase HV) are, every few
years, rebalanced. Each residence has a large green distribution box
where the property line meets the street. All three HV lines come into
each box--re-balancing is just a matter of of swapping connections in
the box. Takes but a few minutes.
Nobody needs this...
All Power companies are doing the same here so nothing is "expensive", it
is the standard. And don#t tell me that the NA Power distribution with
small voltage single phase is economical in sight of the usage of copper...
This may not be typical for the US, but my utility is a rural electric
co-op, so there's less emphasis on profits and more on member benefits.
Chuck you don't know better, so it is ok for you. That's all.
BTW: since someone talked about step donw trannies for power tools..
that's unkown here and not needed, with some exeptions:
There are step down isolated transformers with < 42V for special sensitive
environments. That is called "Schutzkleinspannung" or protective small
voltage. That is used where people can get in touch with the conductors
or in wet envirnonments...seldom used.
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