dear sudev, thanks for your response. > > My office in Okhla had a fire four odd years back due to overheated > UPS left on by a user. As one of the UPS manufacturer was a tenant > downstairs I could get the following explanation: The issue is that > all UPS heat up when "inverting" supply. Over a period the insulation > of wire etc is likely to become weak leading to"leakage" (mild short > circuiting) which in turn draws more current meaning more heating > meaning more insulation breakdown and so on till the cycle results in > flames. More true in long power outages.
that's true. the irony here is that my UPS installations have worked without problems when power-breakdowns would occur daily for 6 to 8 hours non-stop, and then again go through brown-outs and all the vicious stuff that used to happen with the supply. the UPSes have handled those rough years with no breakdowns, except a blown AC or DC fuse once in a while. things have smoothened out now, with minimal breakdowns and better supply and distribution. so am even more intrigued. > Since then we have switched to APC UPS on all applications that need > 24 hour on time and with no external batteries. Some of these have > been in service for long time without problem. It is better to use a > small genset in tandem with UPS than use batteries unless you have a > setup where regular upkeep can be done. I know this is costly but fire > is deadly. right. thanks for the advice. so your APC have some maintenance-free batteries inside for a few minutes of backup while the generator fires up? tia niyam _______________________________________________ ilugd mailinglist -- [email protected] http://frodo.hserus.net/mailman/listinfo/ilugd Next Event: http://freed.in - September 28-29, 2007 Archives at: http://news.gmane.org/gmane.user-groups.linux.delhi http://www.mail-archive.com/[email protected]/
