On Thu, Mar 6, 2008 at 2:57 PM, Wilt, Charles <WiltC@xxxxxxxxxx> wrote:
If you can swing it, the ideal situation would be to have two UPS powering the computer room. Each
one covering half the circuits; then have any equipment with dual (or more) power supplies plugged
into separate circuits each protected by a different UPS.

I agree. It's what i always recommend and use internally. There is a
very important point in this configuration that i can't stress enough:

If you use this configuration, the load on either UPS in normal
operation MUST always be below 50% (ideally below 40%). If one of the
two UPS fails, the power demanded from the remaining UPS will be
TWICE the normal load.

This is because a system with two powersupplies will use BOTH to
supply power, and will need full power from the remaining one. I've
seen more than one setup that didn't plan for this.


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