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The conventional form of lightning protection, lightning arrestors or Franklin Rods, are just metal rods mounted on the top of a structure and then grounded using a series of conductors. This system is intended to protect the structure by making lightning preferentially strike the lightning rod, instead of the structure, allowing the dangerous electrical surge to be grounded by passing through the conductors and then the ground rod.
Based on the class of protection for the structure, decided using a lightning risk assessment system, the lightning arrestor has a defined zone of protection. If any part of the structure goes is outside this zone of protection, more lightning protection, conductors and grounding will be required.
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