VAX Cluster on Ebay in OK (was Re: More DEC equipment spottedin

From: Patrick Finnegan <pat_at_computer-refuge.org>
Date: Tue May 4 19:11:40 2004

On Tuesday 04 May 2004 17:54, Tony Duell wrote:
> > > 240V three-phase is a delta setup, with the neutral half-tapped
> > > between two phases, giving 240V phase-to-phase, 120V
> > > phase-to-neutral on two of the phases, and 208V phase-to-neutral
> > > on the third one.
> >
> > That doesn't sound much like what I think of as neutral - ie,
> > something that has zero nominal voltage to ground.
>
> There is no such thing as ground!.

Sure, there is. It's the voltage potential present on a long electrode
inserted into the earth. :)

> If you've generated a 3-phase supply with one of the phased
> centre-tapped (as we're describing here) complelete isolated from
> everything else (including ground), then you can ground any point of
> it that you like -- including one of the phases or the centre-tap
> point. Of course once you've picked a point to connect to ground,
> then you can't ground any other point in the circuit as well.

Exactly.

Pat
-- 
Purdue University ITAP/RCS        ---  http://www.itap.purdue.edu/rcs/
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Received on Tue May 04 2004 - 19:11:40 BST

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