Re: Explain 3 Phase

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

Original poster: "Millipede by way of Terry Fritz <twftesla-at-uswest-dot-net>" <millipede-at-carolina.rr-dot-com>

3 phase power in the US is  three 60 hertz (cycles per second) signals set
at 120 degrees apart. Thus when cycle A is peaking, cycle B is 120 dgrees
behind it and cycle C is 240 degrees behind A. Your house power is usually
supplied with 240 volt main...which is actually two 120 volt signals that
are 180 degrees oout. So when A is peaking positive, B is peaking negative.
THerefore you have a difference in voltage of 240 V. Your wall sockets have
one of the wires from the 240 paired with a neutral wire to get you 120V. So
basicly, you are gettin one phase. You can do this with a 3 phase system
also.
240 can be found at your dryer hookups and you stove hook ups. If you know
anything about home wiring, you can actually put a 240 volt cicuit breaker
in just for your coil...provided you have room or are willing to go get a
bigger panel and rewire it. Of course, if you DONT know about house wiring,
DON"T do this. These voltage and power levels are VERY lethal.
3 phase power is used in our shop to run our power supplies (we make
conveyors and robots) and some large motor driven equipment. It is more
efficient from what I understand.
Hope this helps.
Robert
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, April 22, 2001 7:07 AM
Subject: Explain 3 Phase


> Original poster: "Matt Skidmore by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <fox-at-woozle-dot-org>
>
> Hi all,
> Could someone please explain 3 phase power to me and the hooks up
> configurations that go with that? i've heard of it here on the ttesla list
> and also been looking at some substations that has labels on them
> indicating 3 phase power. looking over some of the pictures of coilers
> using pigs i have seen 3 hookups on the low voltage side of the pig. i was
> wondering how these are hooked up. is the middle post ground?
>
> also, 240 runs into the home, how do we derive only 120 from that? ive
> noticed that the 240 outlet is 4 pronged. i think i once came accross a
> post that described how to get 240 using 2 120 outlets. could i get an
> explination on how to do that?
>
> lastly, when a person gets 3 phase power to their house, doesnt most
> equipment run on single phase? im just not fully clear on it. is there a
> second phase also? thanks
>
> somewhat confused and amazed,
> fox
>
>
>