On Monday 12 April 2004 00:15, Erylon Hines wrote: > On Sunday 11 April 2004 07:39 pm, Marc wrote: > > On Sunday 11 April 2004 04:14 pm, John Wilson wrote: > > > On April 11, 2004 06:58 am, Anne Wilson wrote: > > > > One caveat, Steve. We had a telephone wire going round the > > > > outside of the house like that. One day we had a thunderstorm, > > > > lightning found the cable, and the whole system (including a > > > > mini-switchboard setup) was fried. > > > > > > > > Anne > > > > > > My guess, Anne, is that someone either bypass the circuit > > > protection on the telephone lines to run the wiring or it wasn't > > > grounded properly. That should never have happened. > > > > > > I do this for a living and I've run wire around the outside of > > > buildings in climates where thunder and lightening are a dime a > > > dozen and I've yet to have this happen to anything that I've > > > installed. Where I have seen it happen is where either the > > > protection has been bypassed or the ground has been severed. > > > > > > For your own piece of mind get that part of the entrance to your > > > house checked or you might end up with a fire if you get hit by > > > lightening again. > > > > > > ttfn > > > > > > John > > > > but a good solid hit can get past it with ease. If you want to find > > out about lightning protection talk to someone who does > > maintainance and repair on telecommunications equipment where tall > > antenna towers are involved. Those guys often learn a LOT about > > proper lightning protection from the school of hard knocks. > > > > Marc > > I work at a large power production facility, and a lightning strike > on one of the high voltage transmission towers took out 37 PLC's in > and around the powerhouse, and about a dozen security card readers at > entrances. Lightning arrestors "usually" protect the equipment, but > no protection is infallible. It only has to fail one time and the > damage is done. > > e I live in tornado alley #5. Thats the BIG honkers, thunderstorms frequent. I installed some communications equipment in Miss. and have often replaced every active component it the lighting system due to lightening. It is my theory that the difference here and there is due to the grounding system. In town each home has a ground rod installed by the electric system provider and likely a ground rod provided by the phone co and maybe all tied into the water system so that the entire town is tied to a very large ground system so the entire area is at one common potential. It is not at all common to have a strike in town. Normally lightenting strikes in the country where grounds are isolated and tend to float(small area). But the one thing that is known. Lightening can and will do whatever it wants. -- Regards; Hoyt
Ignore the past and you will fail! Ignore the future and you have already failed!
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