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Dave wrote:
"The standard method is wire ties and is quite adequate for tower bases." I lost count decades ago on the towers I`ve installed. The peril is high-density current directly through concrete which always contains moisture which has not yet reacted with the cement. This is still true after a thousand years, but the concrete is still strengthening as the reaction continues. Solution to the lightning vulnerability is to bypass the tower base with multiple high-conductivity paths. It`s customary to attach a heavy copper cable to each tower leg and route these cables outside the tower base to their individual ground rods. You don`t do this on a medium wave broadcast tower as 120 radials are ground enough for the tower which rests on insulators. Best regards, Richard Harrison, KB5WZI |
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