Article View: sci.electronics
Article #10004Re: Bullshit, or NOT? AC line problems.
From: John Eaton
Date: Thu, 07 Feb 1991 17:38
Date: Thu, 07 Feb 1991 17:38
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1366 bytes
<<< < high-resistance neutral, but frankly, with today's superior power < supply designs, it's rare for that to be a real problem. --------- Todays switching supplies are superior in size,cost and efficiency but are lousy as loads. They act as negative resistance by drawing more current as the voltage decreases and tend to only draw current during the peak times of the AC cycle. This leads to problems with harmonics on the AC line. I have heard of one case where a large number of PCs on a line caused excessive current on the ground line and started a fire. Some safety agencies are looking into regulating the harmonics that a supply can put onto the AC line. <I think your CE is totally stumped and looking for excuses. ---------- Could be. I would check to see that all grounds are solid and non current carrying. Move PC's around to see if the problem follows a machine or an outlet. John Eaton !hp-vcd!johne
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!sdd.hp.com!hp-pcd!hp-vcd!johne From: johne@hp-vcd.HP.COM (John Eaton) Newsgroups: sci.electronics Subject: Re: Bullshit, or NOT? AC line problems. Message-ID: <2470012@hp-vcd.HP.COM> Date: 7 Feb 91 17:38:19 GMT References: <1991Feb5.005045.388@miavx2.ham.muohio.edu> Organization: Hewlett Packard, Vancouver, WA Lines: 23