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From: neal@mnopltd.UUCP
Newsgroups: unix-pc.general,comp.sys.att
Subject: Re: Brownouts, shorts, explosions and the unix pc.
Message-ID: <173@mnopltd.UUCP>
Date: 18 Jan 91 14:12:38 GMT
Reply-To: gatech!stiatl!mnopltd!neal
Organization: MNOP Ltd., Atlanta, Ga.
Lines: 28
Distribution:


->In article <1991Jan7.124138.19055@ims.alaska.edu> floyd@ims.alaska.edu (Floyd Davidson) writes:
->>
->[ ... lots of good stuff deleted ... ]
->>If you do want to do something along these lines, wrap a couple
->>turns through a high Q toriodal core.  ...
->
->issue ... uh, suffice it to say a lightning strike took out a high
->voltage line and put it squarely in contact with the 220V feed to
->his neighborhood.  He details the types of protection he had and what
->types of stuff survived and what didn't.  In general MOV/coil circuits
->handle lightning strikes if they are several miles away or on the other
->side of a step-down transformer.  More serious stuff - like what 
->happened to Mr. Pournelle - can only be dealt with properly via an
->UPS, preferably with an isolation transformer and a good over-voltage

There is quite a variety in UPS's's.   Many do leave your equipment directly
connected to the power line.    Some provide isolation.   I am aware of Best
UPS's's, which put a big ferro-resonant transformer between you and the 
power line at all times.   They say this can reduce a 2kv jolt down to 3v.
They also weigh a ton...  

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Neal Rhodes                       MNOP Ltd                     (404)- 972-5430
President                Lilburn (atlanta) GA 30247             Fax:  978-4741
                             emory!mnopltd!neal 
                         gatech!emory!mnopltd!neal 
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