3 May
2004
3 May
'04
3:14 p.m.
208 is really a 240 volt 3 phase system measured in a
star
Is it? I'd assumed it was 120V neutral-phase, which is then 208V phase-phase.
In the UK we get 415V 3-phase, which is 240V (our normal mains voltage)
between each phase and neutral, and 415V between any pair of phases.
I have not looked at any 3 phase power supplies for
computers, but I
would bet they are 240 volt 4 wire and don't bother with the neutral at
all, just 3 phases and a ground.
Not at all. A very few PSUs are genuinely 3-phase, and some large disk
drives have 3 phase motors. But in the case of DEC machines at least, the
individual PSUs are single-phase units run between a phase and neutral
(star connected). Of ocurse the load is approximately balanced between
the 3 phases (or it is if the machine is configured properly).
-tony