http://thomaswilburn.net/source/images/sample_sine.jpg A utility company sine wave is the blue line. The gray represents a stepped sine wave.
In reality the utility output is generally full of jagged spikes :) On Tue, Aug 3, 2010 at 10:31 AM, Maglinger, Paul <[email protected]> wrote: > Interesting, but isn’t A/C power typically a sine wave? Or is it implying > that the UPS generates a “special” sine wave that is different than what the > utility company generates? 60Hz is the norm, is it not? Surge strips are > typically no more than some metal oxide varistors placed across hot, neutral > and ground. Some put torodial coils for noise reduction, but I don’t know > of anything in any of them that would damage the UPS or the surge strip. > > > > IMHO, I think the more accepted reason not to do it is because of the > temptation to plug in more devices than the UPS is designed to handle, and > thereby overload it. > > > > -Paul > > > > > > From: David Lum [mailto:[email protected]] > Sent: Tuesday, August 03, 2010 12:01 PM > To: NT System Admin Issues > Subject: Guilty, will change after reading this. > > > > - do not plug surge protectors into a UPS. If they UPS runs on batteries it > will usually generate a step sine wave which may destroy surge protectors > (in particular tricky to find power strips without surge protector) > > > > http://isc.sans.edu/diary.html?storyid=9319 > > > > David Lum // SYSTEMS ENGINEER > NORTHWEST EVALUATION ASSOCIATION > (Desk) 971.222.1025 // (Cell) 503.267.9764 > > > > > > > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
