Fred, Maybe you're right. Do UPSs protect against lightning surge? I know that they protect against low frequency, low magnitude voltage dips and surges. However, I'm unsure of their ability to protect against lightning surge.
If the UPS is specified by its manufacturer to protect against lightning surge; then my question is moot. Even so, I would still wonder, does the UPS guarantee that the UPS and the equipment attached to it would survive the surge? Or does the UPS sacrifice itself in order to protect its load? If there is any question, I would seriously consider putting the surge protector in front of the UPS and protect the whole system. We must also consider the power availability angle. If the surge protector is in front of the UPS; then even if the surge protector sacrifices itself; or blows a fuse to protect the UPS from the surge; the UPS will still power all of the equipment attached to it from its battery. If the surge suppressor were after the UPS; then blowing a fuse or tripping the surge suppressor would prevent the UPS from powering its outputs. Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
