[HECnet] Number of nodes online a bit low?

[Hans Vlems]

The same here, we still say " twee-twintig" or "two-twenty" even    though we've been at 230V for quite some time.
Your calculation is correct, the old ratio was 220/380, which is now 230/400. The latter voltage and angle only between appropriate phases. I once put a VAX 8650 on an incorrectly wired outlet. Low voltage and fans turning the other way around...

Verzonden vanaf mijn BlackBerry 10-smartphone.
   Origineel bericht   
Van: G.
Verzonden: maandag 26 januari 2015 16:48
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Number of nodes online a bit low?

On Mon, 26 Jan 2015 14:49:43 +0100, Johnny Billquist wrote:

This is Europe, remember...
Normal mains are 230V, and 3-phase are 410V phase to phase. All the DEC 
equipment around here are designed to run on that stuff.

Aehm, shouldn't it be 230 * SQRT(3) = 398 (rounded up to 400) or the other way
400 / SQRT(3) = 230 (slighty rounded down)? :)

Actually, if I'm not wrong, 400 volts should be just a nominal standard voltage,
and some European countries have different real voltages, but they would be
still in range because of the allowed drift (something around plus/minus 6-10%).
I think there is something about that in Wikipedia. Again: if I'm not wrong. :)

Indeed here in Italy nominal household voltage was 220 volts up until few years
ago, and it still is: just now I have a 219 volts reading at the outlet, and I
live downtown in a quite big northern city (i.e. not countryside).

In everyday speaking even electricians still refer to 3-phase 400 volt power as
"three eighty" (lit. tre ottanta) i.e. the old 380 volt nominal voltage. :)

HTH,
G.


P.S. I think that the UK may still be on 240/415 actual voltage even if they
adhere to the European standards about the unified 230/400 delivery.