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![]() wrote ... In article , "Szczepan Bialek" wrote: Grounded towers with the many spikes dissipate more charge then the simmilar towers with the polished big ball. That with the many spikes PREVENT (or minimalise), that with the balls CATCH (high current strokes). Much of this is speculation. It is a history: "In the early days of lightning conductors, I believe that the French didn't like the nasty pointy things which the British had installed. Instead, they decorated theirs with fancy balls at the top - with sometimes disastrous results. -- Ian" With 10 million volts; currents of 10,000 amperes and strokes that can travel 30 miles: whether you have a ball or a spike on top of a roof isn't going to make much difference. The volts appear when no chance to dissipation. To have it on the roof must be multiplicity of spikes (not one). It has been shown that a properly installed lightning rod system; and UL rated materials connected to low resistance grounds will increase the odds of protecting lives and property substantially. (The TV stations on top the Sears tower in Chicago continue to transmit even as they are being struck.) All is true. I only wanted to add something about the spikes and balls. It was nice that Ian support me with the funny anecdote. S* |
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