Quote:
Originally Posted by Uberschaf
I have read where they have to install a large grid (like chain link) in the soil to dissipate the lightning strike not just a ground rod.I only see them using a ground rod.
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The "chain link" described is a grounding mat that is used by electric utilities to ground high voltage transformers at substations like the one off of Belle Meade Circle. The ground rods for residential properties are typically 10 ft long, five eights inch thick steel copper clad rods that are driven two feet below grade. In some soils they may need to go deeper which is the responsibility of a qualified installer of lightning protection systems. The number of ground rods needed is dictated by the national standard on lightning, NFPA-780, Standard for the Installation of Lightning Protection Systems.