Xref: utzoo sci.electronics:13063 sci.physics:13729
Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!ucsd!swrinde!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!cica!iuvax!ux1.cso.uiuc.edu!midway!oddjob!matt
From: matt@oddjob.uchicago.edu (Matt Crawford)
Newsgroups: sci.electronics,sci.physics
Subject: Re: UPS (Uninterruptable Power Supplies)... kinda long.
Message-ID: <1990Jul24.211157.24653@midway.uchicago.edu>
Date: 24 Jul 90 21:11:57 GMT
References: <1990Jul21.195257.9277@cunixf.cc.columbia.edu> <1990Jul22.171116.2062@bellcore-2.bellcore.com>
Sender: news@midway.uchicago.edu (News Administrator)
Reply-To: matt@oddjob.uchicago.edu (Matt Crawford)
Followup-To: sci.electronics
Organization: Morse Science High School
Lines: 24
In-Reply-To: karn@thumper..bellcore.com (Phil R. Karn)

I'd like to leap in here with a related question.

What ratings make for a good surge suppressor?  I have a Sparcstation at
home and I live in a lightning-rich part of the country.  My whole
system draws less than 15 amps.

I see claims like 

	"clamps surges at 325 volts within 5 ns"

	"provides 10-40 dB EMI/RFI noise attentuation"

	"provides 300 joules differential plus 225 joules common
	mode protection"

	"tough enough to absorb 2 million watts of power in one
	nanosecond"

Given that I understand all the terms, and my physics hasn't
rusted so badly that I can't see that the last statement is
bupkus, what are the minimum acceptable figures to assure a great
reduction in the chance of damage?
________________________________________________________
Matt Crawford	     		matt@oddjob.uchicago.edu