krowitz%richter@UMIX.CC.UMICH.EDU (David Krowitz) (12/14/89)
I've been looking into buying a surge suppressor for the DN4000 I have at home, and they seem to range in price from $15 to $150. They all seem to have the same basic features (both common mode and differential mode (ie. protecting both "hot" to ground and "common" to ground) protection), so why do the prices vary so much? Anyone got a recommendation as to a particularly good brand to buy? -- David Krowitz krowitz@richter.mit.edu (18.83.0.109) krowitz%richter.mit.edu@eddie.mit.edu krowitz%richter.mit.edu@mitvma.bitnet (in order of decreasing preference)
art@AERA785.MITRE.ORG ("Art McClinton") (12/14/89)
Date sent: 14-DEC-1989 00:57:54 GMT > >I've been looking into buying a surge suppressor for the >DN4000 I have at home, and they seem to range in price >from $15 to $150. They all seem to have the same basic >features (both common mode and differential mode (ie. >protecting both "hot" to ground and "common" to ground) >protection), so why do the prices vary so much? >Anyone got a recommendation as to a particularly good >brand to buy? > -- David Krowitz What you are paying for is the ability to "re-act quickly" and handle a large spike. A cheap surge supressor will not re-act quickly. It uses a circuit breaker to shunt the spike. Also as the load increases, it is harder to develop a quick a dirty (read that cheap) solution to protect. Thus it is almost impossible to get a cheap surge protector for a DN10000. * *---Art * *Arthur T. McClinton Jr. ARPA: ART@MITRE.ORG *MITRE Corporation Phone: 703-883-6356 *7525 Colshire Dr Internal Mitre: ART@AERA785 or M10319@MWVM *McLean, Va. 22102-3481 DCS: MCCLINTON * FAX: 703-883-6308
rtp1@tank.uchicago.edu (raymond thomas pierrehumbert) (12/14/89)
Can anybody recommend any surge suppressor at all for a DN10000, cheap or otherwise? Is one really necessary, or does the power supply take care of the important stuff (like lightning hits)?
dkukral@encad.Wichita.NCR.COM (Dean Kukral) (12/14/89)
In article <8912131719.AA18047@richter.mit.edu>, krowitz%richter@UMIX.CC.UMICH.EDU (David Krowitz) writes: > I've been looking into buying a surge suppressor for the > DN4000 I have at home, and they seem to range in price > from $15 to $150. They all seem to have the same basic > features (both common mode and differential mode (ie. > protecting both "hot" to ground and "common" to ground) > protection), so why do the prices vary so much? > Anyone got a recommendation as to a particularly good > brand to buy? > An EE friend of mine thinks that surge suppressors in this price range are not worth alot. We had reliability problems with our Apollos and tried surge suppressors, hoping they would help. We paid about $100 each and got the kind with the drop-out protection, i.e. when the electricity went off, the surge protector stayed off. The idea was that when the electricity came back on, it had a surge which was the real cause of most of our problems. After installing the surge suppressors, it seemed like we had less trouble. However, about that time the DN3000's started coming in, and then we took part in Mentor's upgrade program to upgrade all of our nodes to DN3000's. The newer nodes have been much more reliable, and I doubt that it was the surge suppressors that did it. We still use the surge suppressors, though - just in case they do some good. They are cheap compared to the cost of down-time. And they are a one time only expense. -- Dean Kukral, NCR Peripheral Products Division, Wichita, Kansas dean.kukral@wichita.ncr.com
lampi@pnet02.gryphon.com (Michael Lampi) (12/15/89)
There are a number of power conditioner/uninterruptable power supply
manufacturers that claim to offer systems in the 2KVA and up range, which
covers the requirements of the 10000.
BTW, if you have an 'empty' 10000, you only need to provide 15 amps (and can
probably plug your UPS into a 20 amp circuit). A more fully loaded DN-10000
will require something more substantial.
Michael Lampi MDL Corporation 213/782-7888 fax 213/782-7927
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