centos-bounces at centos.org wrote: > Brunner, Brian T. wrote: >> centos-bounces at centos.org wrote: >> >>> And the APC Smart-UPS 750 units are not all that expensive >>> either. Even the 1500VA units are a lot less expensive then they >>> were 5-10 years ago. $250-$300 to protect $2000-$6000 worth > of hardware is worth it in my book. >> >> To what extent does a UPS *protect* the hardware? >> Maintaining up-time during brief brown-outs is one thing I expect of >> a UPS,Orderly shutdown is another thing I expect of a UPS. >> >> *protection* of the PC from irregularity in the AC Mains by a UPS, >> however, I question. Rather, it seems, any power irregularity that >> would kill a PC by propagating through the PSU will also propagate >> through the UPS. >> >> NO UPS MADE TODAY (according to my reading of the stats on >> advertisements) eats lightning strikes and asks for more. >> >> So per your experiences and greater technical savvy: What PSU/PC kill >> power irregularities will be stopped by which UPS? > > Really? That's what you read in the specs? Yes. Compare the joules rating (as being stopped by a UPS with surge suppression) to the joules required to damage the computer on the other side of a PSU. So per your experiences and greater technical savvy: What PSU/PC kill power irregularities will be stopped by which UPS? Robert Heller suggested that UPS architecture matters: AC->DC::DC Batteries::DC->AC Where input AC is electrically decoupled from output AC. Not many adverts for UPS's explain whether this is the case with their UPS. > Here, I thought that good quality surge protectors would do that, > and my UPS does says surge protection as well as UPS. IIRC, UPSs, and better surge > protectors, offer a multi-thousand dollar warranty if it doesn't stop a large > surge and your system's fried. Have you tried collecting on said warranties? Be prepared to prove that the surge that fried your hardware did not exceed the joules rating on the surge suppressor. Insert spiffy .sig here: Life is complex: it has both real and imaginary parts. Life is not measured by the number of breaths we take, but by the moments that take our breath away. //me ******************************************************************* This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept for the presence of computer viruses. www.Hubbell.com - Hubbell Incorporated**