Surge / Ground / Lightning
in [Home Built PC]
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From: trader4 on 5 May 2008 12:28 On May 5, 10:54 am, "Dave" <no...(a)nohow.not> wrote: > I wonder why, since electrical codes in North America > and Britain require a ground connection at each outlet; > computer power cords are 3 wire? > > (snip) > > hot neutral ground Meanwhile, I'm still waiting for an explanation from w_ about how surege protection inside that computer can work? Where is that direct connection to earth ground, without which w_ says surge protection is impossible? Does the computer have a mythical earth ground inside? The answer is it doesn't. It is acting under exactly the same limitations and uses the same components, typically MOVs to do what a plug-in surge supressor does. w-'s answer to this is to claim that electronics, appliances, etc do not use MOVs, a claim previously smashed, because of course they do. Plus it really has nothing much to do with the question anyway, because the computer, appliance, etc still HAS NO DIRECT EARTH GROUND, without which w- says protection is impossible.
From: charles on 5 May 2008 12:41 In article <fvn72o$rta$1(a)registered.motzarella.org>, Dave <noway(a)nohow.not> wrote: > > > I wonder why, since electrical codes in North America > and Britain require a ground connection at each outlet; > computer power cords are 3 wire? > (snip) > hot neutral ground or, as we call it, Live, Neutral & Earth -- From KT24 - in "Leafy Surrey" Using a RISC OS computer running v5.11
From: spamfree on 5 May 2008 13:05 On Mon, 5 May 2008 09:28:05 -0700 (PDT), trader4(a)optonline.net wrote: >On May 5, 10:54�am, "Dave" <no...(a)nohow.not> wrote: >> I wonder why, since electrical codes in North America >> and Britain require a ground connection at each outlet; >> computer power cords are 3 wire? >> >> (snip) >> >> hot neutral ground > > >Meanwhile, I'm still waiting for an explanation from w_ about how >surege protection inside that computer can work? Where is that >direct connection to earth ground, without which w_ says surge >protection is impossible? Does the computer have a mythical earth >ground inside? The answer is it doesn't. It is acting under exactly >the same limitations and uses the same components, typically MOVs to >do what a plug-in surge supressor does. w-'s answer to this is to >claim that electronics, appliances, etc do not use MOVs, a claim >previously smashed, because of course they do. Plus it really has >nothing much to do with the question anyway, because the computer, >appliance, etc still HAS NO DIRECT EARTH GROUND, without which w- says >protection is impossible. I'm curous to know how surge suppression can work without a ground (earth) of any sort. Does the "black box" detect overvoltage and disconnect the power like an earth leakage safety switch? This might be fine for a TV, but surely not for a computer. I don't recall any computer I've owned that did not have a three wire connection to the mains. That and a MOV is OK for smallish surges, but I believe that for a large surge, the sort that will blow a telephone off the wall, one needs a large, short-path earth for the surge detector to dump the extra power down. I've got a few plug in protectors here and there to sop up a small spike, but when a storm is within a few km, I pull the phone wire out of the ADSL router, and the plug out of the mains. If I'm working at the time, I might just keep a watch on the weather radar and count lightning fashes to thunder times. It's rare that I get interrupted. I have underground power and phone lines so that gives a little extra protection, I believe. I've been told that Australian phone lines are the most vulnerable, and the most urgent to protect or disconnect. I hope to be going wireless soon which obviates this problem. jack
From: spamfree on 5 May 2008 13:14 On Mon, 5 May 2008 19:21:16 +0300, "Tzortzakakis Dimitrios" <noone(a)nospam.void> wrote: > >� "Tantalust" <Tantalust(a)paradise.net> ������ ��� ������ >news:RPidnaZzhcrV0oXVnZ2dnUVZ_hadnZ2d(a)comcast.com... >> "NB" <nobuyout(a)gmail.com> wrote in message >> news:b53f2fef-00bd-40d0-9ac1-c69b3bcadf52(a)x41g2000hsb.googlegroups.com... >>> Who is W_TOM and why has he appeared in every single thread that has >>> contained those keywords since 2001??? >> >> He an obsessive-compulsive disorder victim, apparently driven by some kind >> of bizarre fetish involving ground rods. >> >> >What kind of ground rods? I prefer steel core, copper clad ones:-) I even >have the special heavy hammer> I'm on 2000' of sand, and at the moment, my house earth is the copper water pipes, but the water corp keep adding plastic bits here and there, so I don't really trust it. I was going to hammer in a 20' length of 3/4" copper pipe under a large tree which gets the drain from my grey water. Probably the best I can do. I'm not a full bottle on earth loops yet so i don't know about leaving the water mains connection still connected. What's the best way to test an earth? I heard once that a large electric radiator (fire) connected between active (hot) and the earth will glow as per normal if the earth has good capacity. Perhaps a current comparison between the earth return and neutral return would be more informative? jack
From: Mike Tomlinson on 5 May 2008 14:09
In article <MPG.2288b7113e6f82e7989695(a)news.bcsupernet.com>, Jitt <tser827(a)yahoo.com> writes > I wonder why, since electrical codes in North America >and Britain require a ground connection at each outlet; >computer power cords are 3 wire? Many older domestic installations in N America are two-wire only (no ground.) In the UK and much of Europe, all outlets are grounded, so surge protectors do work effectively. w_tom has been informed of this fact many times but continues telling blatant lies, spreading FUD, and misrepresenting what others write. -- (\__/) Bunny says NO to Windows Vista! (='.'=) http://www.cs.auckland.ac.nz/~pgut001/pubs/vista_cost.html (")_(") http://www.cypherpunks.to/~peter/vista.pdf |