Re: Want to move to all 208V for server racks

[Ingo Flaschberger <if () xip at>]

> I was just recently trying to explain this to a European friend who thought I was hallucinating this system, so I took 
> a picture.
>
> http://dl.dropbox.com/u/230717/temp/208YPanel.jpg
>
> That's a picture of one of the breaker boxes in our office, showing what you described.  There are 3 phases coming into the 
> panel, each a different coil off a Y transformer, as well as a "neutral". Those are the 4 black wires you see at the bottom. 
> You can see how the three hot phases are staggered as they go up the breaker rails.
>
> For standard 110V service, you use a single-wide breaker and send one hot phase + neutral and you get 110V. The difference between two 
> phases is 208 volts though, so you use a double wide breaker and can send to device without using a neutral wire. Just 2 hots and a 
> ground. If that's all you're doing (you don't need legacy 110V service anywhere) you skip the ground wire going into 
> the panel entirely.

that one looks dangerous.

In europe:
http://img406.imageshack.us/i/verteilerkasten.jpg/

64A 240V 3-Phase input.
Out to Servers single phase, output to airconditioners with 3 phase (not 
at this picture).

Kind regards,
        Ingo Flaschberger