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

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Tue May 4 17:54:27 2004

>
> > 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!.

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.

-tony
Received on Tue May 04 2004 - 17:54:27 BST