Running 3 phase 780s on single phase power (was RE: hams on classiccmp)
Roy J. Tellason
rtellason at verizon.net
Mon Jan 19 14:11:48 CST 2009
On Monday 19 January 2009 02:59:53 pm Patrick Finnegan wrote:
> On Monday 19 January 2009, Roger Holmes wrote:
> > > But, if you run the same load from three separate single phase
> > > circuits and (worst case) the three circuits are all the same phase,
> > > then the neutral current will be the SUM of all three phase currents.
> > > That's 3 times what it would be otherwise and runs a serious danger of
> > > melting the neutral and starting a fire.
> > I agree with all but the last bit, because if he's running it from
> > three separate supplies, surely he will have three neutral
> > conductors, so no problem.
> Not if he uses the original pdu and original power cord, which has only
> a single 10AWG neutral conductor.
Ah, THAT was the missing piece...
Now I understand what the concern is with this stuff!
Not being familiar with these systems, is that cord hard-wired in to the
computer end of things? Hooked to a single connector? Something like that?
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