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power surge protection

Posted on 2000-01-24
Medium Priority
Last Modified: 2010-04-26
according to surge manufacturers, salesmen, and "dummies" books and "bible" books on computers, 300-360 joules is enough to protect a personal computer, but nothing could protect against lightning.

But some manufacturers maintain that their 1500 to 2500 joule UPS battery surge protectors can protect against lightning. Is that true?
Question by:jefhatfield
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Expert Comment

ID: 2383936
""According to a primer on lightning by NASA scientists Hugh Christian and Melanie McCook (1), a lightning strike has a peak power of about one million megawatts (MW), or an average over the duration of the strike of about 500,000 MW.""

Since Watts=Joules per second,  so then if the lightning strike is direct or nearby and takes even as short a time as a fifth of a second that is still at least 100,000 MegaJoules, or only about 5 powers of 10 over the capacity of that thar UPS :-/ so go figure.


Road Warrior.
LVL 11

Expert Comment

ID: 2383943
The statement that nothing can protect against lightening is slightly erroneous however, since if you put your PC with an independant power source in a faraday cage (a big screened enclosure) then provided you had no external connections, it would be safe, maybe you'd want a modulated laser uplink to your isp tho' :-)

Accepted Solution

celtics earned 150 total points
ID: 2384902
For maximum protection I would go with a Line Interactive UPS.  A brand that is affordable yet high quality is the Opti-UPS.  We run the models 280ES and 420ES here and they are nice units backed by good warranty.  PC Connection carries the units if you want a closer look or go to their web site : http://www.opti-ups.com

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