"Volts500" wrote in message
...
Subject: Wiring a 480V Single Phase Circuit
From: "PrecisionMachinisT"
Date: 7/17/2004 8:25 PM Eastern Daylight Time
Message-id:


"volts500" wrote in message
...

"PrecisionMachinisT" wrote in message
...


At any rate, a better description IMO would have been something like
"
a
two wire service, usually one phase of a three phase supply"

One phase to neutral of a 480 volt 3 phase supply is single-phase but
the
voltage is only 277 volt. The OP wanted to know what single-phase 480
volt
was. Chris was absolutely right, whenever 2 phases of a 3 phase
system
are
combined, the resultant sine-wave is single-phase. (It's called
single-phase because _that's_ what it is.)


Horse ****.

Makes absolutely no differance how it is derived--could be from a single
phase generator, or battery backup with an inverter and still be single
phase.

You need to toss the three phase reference out the door because it is of
absolutely no value in defining single phase power.....


Get a clue, dummy. In order to get 277/480v from the power co. it's gonna
be 3
phase. Obviously you have NO conception of how single phase power is
derived
from 3 phase power.


..........DAMN........I'M IMPRESSED.........

**** off, you imbecile--and just see how far you get by calling people
names.

The OP never mentioned 277 volts....YOU DID THIS, ostensibly as an excuse to
call someone a "dummy".....But if I want 277v though, I certainly dont have
to derive it from a polyphase system.....

Again, voltage has nothing to do with it. Single phase is nothing more than
a single a/c circuit, you scope it and it alternates between a high and a
low voltage.

You only have a single phase.....this is as opposed to a polyphase
system....

http://dictionary.reference.com/sear...gle-phase&r=67

[
1 entry found for single-phase.
sin·gle-phase (snggl-fz)
adj.
Producing, carrying, or powered by
]

The voltage can be changed easy enough with transformers--run it here....run
it there....isolate it....center tap it, its split phase---but STILL, SINGLE
PHASE......makes no differance how it was derived.......use an old telephone
crank for all I care......

FWIW, I actually have some motors that run on FOUR and some that even run on
FIVE PHASES--commutation is via PWM technology.....


You have the cart in front of the horse--three phase being three single
phase circuits that are 120 degrees out of phase from each other,
connected
together in a star or a triangle configuration.


What do you think a WYE connection is?


Could be one of the examples above--why dontcha just go ahead and take a
wild guess ???


And by the way, anyone who knows diddly squat about power distribution is
likely not very impressed at your obvious attempts at further clouding
the
issue by your rattling off various types of three phase service, bringing
in
line to line and center tap voltages, control transformers, streetlight
wiring and all the rest of the irrevelant crap.

I should have known that a moron like you couldn't understand basic
electric
disribution.


You havent a clue as to what I might or might not understand, and your doing
yourself no favors by continuing with the name calling here.


Looks like you're another one of those alt.H(ack)VAC wannbe
electrician's........as you are making an ass of yourself over knowledge
common
to the electrical industry. There is no doubt that you have never done
electrical work for a living to make the statements that you have made. Go
back
to doing machine work and leave the wiring to the sparkies before you kill
yourself or someone else.


.....LOL.....

I was wiring residential and building shortwave radio from scratch at the
age of ten years old.......

.....AND.....

As to your "alt.H(ack)VAC wannbe" statement--you are really starting to
sound a LOT like some of them guys there with this "leave the wiring to the
sparkies before you kill yourself or someone else" attitude, no?

....ALSO....

Where *I* live, you dont need a license to do electrical work, it just has
to pass inspection--you just can't charge for it with no license.....

I've wired up many, many new services--and I never once been gigged by the
inspectors.......

The last one I did was for myself, a 400amp ct single phase setup with a
pair of 200 amp panels, each panel also feeding a 100 amp to a 50 hp rotary
transformer to generate three phase for the machine shop, this "generated"
power being fed into a pair of three phase panels, branch circuits then
feeding the machinery.

The rotary units I engineered and wired myself, inside of a pair of hoffman
24x36 cabinets--they're protected with overload contactors and they start at
the push of a button, a 220/120v transformer providing control
voltage.....if mains power is interrupted for even a split second the entire
system drops out in order to prevent possible utility line spikes from
damaging the connected load.

You can fool some of the people some of the time.....

http://www.allaboutcircuits.com/vol_2/chpt_10/1.html

"The term "single phase" is a counterpoint to another kind of power system
called "polyphase" which we are about to investigate in detail."

"Single phase power systems are defined by having an AC source with only one
voltage waveform."

Doh!!!

--

SVL