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Re: 208v Air Compressors

To: pethier@isd.net
Subject: Re: 208v Air Compressors
From: Donald H Locker <dhl@chelseamsl.com>
Date: Sat, 13 Oct 2001 02:28:50 -0400 (EDT)
Absolutely!!  And if you don't know, get someone who really does.  The
dangers are real.  I don't often see wye-connected equipment, but
that's because I usually deal with smaller stuff.

Donald.

> From: "Phil Ethier"<pethier@isd.net>
> Date: Fri, 12 Oct 2001 21:52:23 GMT
> 
> >
> >Don't know whether this will help anyone else - but what I understand from
> Donald's
> >explanation is that the three phases are equal and balanced but the neutral
> is not
> >"at the center". Makes sense to my mechanical brain.
> >
> >
> >Donald H Locker wrote:
> >
> >> Hmmmm.  I'll try some ASCII art.
> >>
> >>             C
> >>            / \
> >>           /   \
> >>          /     \
> >>         /       \
> >>        /         \
> >>       /           \
> >>      /             \
> >>     /               \
> >>    A--------n--------B
> 
> This looks like the "DELTA" configuration.  There is also a configuration 
>known
> as "WYE".  Don't mix them up.
> 
> We had a bake-out oven when I used to build electron-beam lasers.  The 
>electricians
> wired it wrong.  They didn't even have the decency to test the oven.  I did
> not know this.  There was a large contactor in a metal case mounted up on the
> top of the framework.  I flipped on the oven switch and the contactor closed.
>  An virtually exploded.  The cover blew off and bounced against our fume hood
> and back against the oven and back a few times before clattering across the
> floor.  Damn, my heart stopped.  My boss'
> 
> Get a book.  Look up these two wiring methods and be damned sure you know what
> you are doing.
> 
> Phil "that's not the only time shoddy work by folks in that lab scared the 
>hell
> out of me" Ethier

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