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Learn why 'problem' Central Offices had surge damage - the
problem COs directly traceable to bad earthing in that building due to human failure. But then too many experts don't even know the early 1960s history of ESS-1. How many switching computers did your phone company replace in your town this year - the entire computer damaged by lightning. None. Damage not acceptable in any town, anywhere, any year .... because electronics damage from lightning is that routinely avoided. Lightning damage is routinely traceable to human failure - the technology being that old and that well proven. Cell phone sites do have halo ground. Why? Even the world record lightning strike must never damage an cell phone location. And so they install more than just a copper earth rod. In the meantime that halo ground is not why your cell phone does not work underneath the tower. Properly installed Ufer ground never damage concrete. Human fails - and then blames lightning for the concrete failure? Human is reason for failure. Damage from direct lightning strikes - especially strikes that might damage concrete - are always directly traceable to human failure. Protection from the direct strike is that routine and that easy. Rather than lecture on reading tower talk, instead read about effective lightning protection in tower talk - and why damage from lightning is directly traceable to human failure. You are quoting the wrong source if you think tower talk says lightning damage is unavoidable: http://lists.contesting.com/_towerta...il/004413.html The basic scenario is to install a Single Point Ground System that is installed at the building entry. It shunts everything to ground before it goes in the building. If you can keep it outside, then you don't really have to do much inside. http://lists.contesting.com/_towerta...st/032935.html What you're proposing to do has the makings of what is referred to as a Ufer ground. Named for its inventor, the principle of the Ufer ground is simple. ... according to Polyphaser's "Grounds for Lightning Protection" publication. http://lists.contesting.com/_towerta...er/026083.html An Ufer ground ... this may be the ENTIRE ground system. Since the concrete is conductive and there is lots of concrete area in contact with the soil, it does a pretty reasonable job. Effective protection from direct lightning strikes is routine. Lancer wrote: ... What is a problem central office building? The telephone companys lose hundreds of "channel unit" boards to lightning damage every year. Most if not all boards lost are in the remote sites, not the central office. The boards that are lost aren't due to human faillure, they are due to the fact you cannot predict lightning, and cannot totally protect against it. ... Cell sites have a copper ring of protection around the site. I have been in cell sites that were so totally shielded that my cell phone wouldn't work in them. Everything entering or leaving the site is totally protected. Quite impratical for the normal home owner. ... You might want to read up on the damage that has occured when the grounds for a tower were encased in the conctrete base that was the tower mount. They are cases were the lightning "blew" the concrete base up. I don't know which original poster you are talking about. My tower is properly earthed, a direct strike didn't damage my towers or antennas. The induced voltage that got into my network cables is what caused most of my damage. The telephone companies have much the same problem, most of the lightning damage isn't from direct strikes, its from their wireline pick up of induced voltage of a close strike. I think you need to quit reading up on it so much, and spend more time looking at whats practical and proven to work for the CB or ham radio operator. Here is a good place to start: http://lists.contesting.com/archives//html/Towertalk |
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