Surge / Ground / Lightning
in [Home Built PC]
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From: Sjouke Burry on 6 May 2008 14:45 Tzortzakakis Dimitrios 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> > > Can you trim W_tom with that?? Or is he incurable?
From: nicksanspam on 5 May 2008 06:53 w_tom wrote: > Same is described by van Deursen and van der Laan when lightning > caused damage to a nuclear hardened maritime radio station. Did they > cry, "Woe is me. Nothing can stop lightning damage"? Of course not. Nono. They cried "w_tom is me. Stop lightning damage I can." Nick
From: trader4 on 6 May 2008 15:08 On May 6, 12:08 pm, "Michael A. Terrell" <mike.terr...(a)earthlink.net> wrote: > w_tom wrote: > > > On May 4, 9:09 pm, "Michael A. Terrell" <mike.terr...(a)earthlink.net> > > wrote: > > > The same thing we did in the studios and transmitter sites. Use a > > > combination of protection at the building's main disconnect, and > > > individual protection at each critical device. The only thing that I've > > > lost in the last ten years was when lightning hit a huge pine tree, and > > > cut the top half of it off. It landed on the ground right over the > > > buried telephone line, and a second strike blew out the modem and MOV > > > protection on the phone line. > > > You suffered damage from a lightning strike and call that effective > > protection? Modems are most typically damaged by surges entering an > > AC mains. Outgoing surge path would be the phone line to earth via a > > telco installed 'whole house' protector. Damage from lightning is > > effective protection? After spending how much for all those > > protectors, you call that protection? > > Where did I say HOW was protected? It was my second week at that > station, and the chief engineer took off on a long overdue vacation. If > you would learn to read, rather than just do mindless rants you wouldn't > look so stupid. At that time the building had a UFER ground, and a > three phase protection system at the meter CTs. That didn't prevent the > damage, as you claim it should. > > > Phone lines do not use MOV protectors. Basic information that you > > would have learned if not wasting time insulting people. > > Sorry, _wacko_ but you are the one slinging insults and ignoring > proof from hundreds of people. > > > MOVs have > > too much capacitance. Phone line 'whole house' protectors use other > > technologies with lower capacitance. > > Gee, _wacko_ you've never seen ANY modern business telephone > equipment? Gas tubes are fragile and very expensive. The protection > isn't to save the privately owned telephones, it it to limit damage to > the building. Even that mid '60s 1A2 system had every output of the > power supply fused to prevent a fire. Explain why an MOV's capacitance > is high enough to affect a phone line. Never mind. I have a Nitsuko/NEC > DX2NA-32SYTEMEM KEY TELEPHONE SYSTEM in front of me, and every CO line > in it has a MOV across the line. Once more, you're preaching lies and > using deceit to try to make others look bad. > > ,http://refurbishednitsuko.net/productInfo.aspx?productID=75978489-9ac....> > is the Central Office line card for four telephone lines. See the black > MOVs to the right of each pair of fuses? > > <http://refurbishednitsuko.net/productInfo.aspx?productID=f5453e33-047....> > is the card for four standard 2500 type telephones, or equivalent > equipment. See the pairs of black MOVs over the blue connectors at the > bottom of the screen? They are all japanese, with no brand markings. > > <http://www.epcos.com/web/generator/Web/Sections/Publications/PDF/SIOV...> > is the Epcos MOV databook, with datasheets for Telecom applications. > page 213 list the TELECOM MOV data. > > Every line into that studio building had a long distance call device > diverter in the line that had MOV across the phone line. Every one of > them survived the direct hit to the building and STL tower. That's more > than can be said of your ability to use reason, and learn new things. > > You need to get your head out of 1920 and learn modern electronics. > The one thing we learned today is that you don't know any more about > Telecom that you do lightning protection, or reading comprehension. > W_ denies MOVs are commonly used in typical electonics or modern appliances too. He had to, because he can't answer the obvious question of how MOVs can be used effectively in these applications, yet they can't work in plug-in protectors and the only way to get any protection is to have a nearby direct earth ground. Faced with the problem of MOVs providing protection in electronics/appliance without an earthground, he simply denies MOVs are used in electronics and appliances. Here's the references that I provvided him on that one: Here, from Appliance Magazine and Appliance Design websites: http://www.appliancedesign.com/CDA/Articles/Electronics/BNP_GUID_9-5-... "New thermally enhanced MOVs help protect a wide variety of low-power systems against damage caused by over-current, over-temperature and over-voltage faults, including lightning strikes, electrostatic discharge (ESD) surges, loss of neutral, incorrect input voltage and power induction. These devices help provide protection in a wide range of AC line applications, including AC mains LED lighting systems, PLC network adapters, cell-phone chargers, AC/DC power supplies (up to 30 VA as input power for 230 VAC input voltage), modem power supplies, AC panel protection modules, AC power meters, and home appliances. " http://www.appliancemagazine.com/print.php?article=1778&zone=1&first=1 "Protecting increasingly sophisticated and complex control boards from misconnection, power surges, or short circuit damage is of particular concern to the equipment manufacturer. Although appliance transformers, their enclosures, and connections are capable of withstanding higher voltage transients, the use of sensitive solid- state devices on the board necessitates improved overcurrent, overtemperature, and overvoltage control. Coordinating overcurrent and overvoltage protection can also help designers comply with safety agency requirements, minimize component count, and improve equipment reliability. A metal oxide varistor (MOV) overvoltage protection device used in a coordinated circuit- protection strategy with a line-voltage-rated PPTC overcurrent device helps manufacturers meet IEC 6100-4-5, the global standard for voltage and current test conditions for equipment connected to ac mains."
From: Tantalust on 5 May 2008 08:17 "w_tom" <w_tom1(a)usa.net> wrote in message news:6bf6aafc-99ed-47e6-95b3-b98f5a2df8ae(a)d1g2000hsg.googlegroups.com... On May 4, 1:24 pm, "Tantalust" <Tantal...(a)paradise.net> wrote: > Why do you have this pompous attitude; constantly sermonizing down to > people > as if they're your little, personal kindergarten class? >Ask polite or technical questions =snip= "Boys and girls....claaaasss........be *polite* to our nice, kind kindergarten teacher.....". LOLOL
From: Tantalust on 5 May 2008 09:24
"w_tom" <w_tom1(a)usa.net> wrote >Yes, plug-in protectors do have limited protective functions. Look at poor w_tom starting his back-pedalling. Back-pedalling, back-pedalling, back-pedalling. |