Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!gistdev!flint From: flint@gistdev.gist.com (Flint Pellett) Newsgroups: comp.sys.att Subject: Re: UPS for 3B2s? Keywords: ups 3b2 Message-ID: <1178@gistdev.gist.com> Date: 10 Jun 91 16:03:01 GMT References: Organization: Global Information Systems Technology Inc., Savoy, IL Lines: 21 If you are trying to protect a system from lightning, you ought to consider a couple of other things as well. Even when a system is fully protected by a UPS, it is not safe. Power spikes can come in over phone lines as well, and another source of trouble can simply be long runs of cable, which can be subject to induced currents if placed in a strong enough electric field. Even shielded cables can have problems, since the currents can be induced in the ground lines. We recently experienced a very close lightning strike here, and the UPS protections we had did no good-- nearly every serial port we had was fried, and every ethernet board, even in machines that were powered down at the time. Several telephones also were put out of commission. The ethernet is coax, and the serial lines all have shielded cable, so the best guess we have is that it was currents induced in the ground wires or shielding that got to things. The UPS devices are all still operational. -- Flint Pellett, Global Information Systems Technology, Inc. 1800 Woodfield Drive, Savoy, IL 61874 (217) 352-1165 uunet!gistdev!flint or flint@gistdev.gist.com