265V is a common top voltage threshold, but you'll need to look at the equipment specs.
The US grid is specified to produce 120/240V +-5%. So 240 could be up to 254V and still be in spec. (240V+12V) Equipment is supposed to accept at least +-10%, so up to 264V. (240V+24V). Personally I'd set the threshold at at least 255V. On Tue, Sep 5, 2023, 4:09 AM <dmmoff...@gmail.com> wrote: > Do any of you smart guys know how far out of whack does AC voltage have to > be to cause trouble? > > > > We have an NMS monitoring rectifier input voltage and it’s current alarm > threshold is 250V. Occasionally that goes off and everyone ignores it. > I’d like to set an alarm threshold where we should actually be alarmed > about it. > > > > The Vertiv rectifier spec sheets claim we get full efficiency up to > 300VAC, and the alarm threshold in their default config is 326V. So I’m > not so concerned about those. There’s probably other stuff on fire before > the rectifier gives a hoot, but the other stuff might matter. We usually > have an air conditioner separate from the rectifier, and occasionally in > places there’s a UPS with something on it that can’t run on DC. > > > > -Adam > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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