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A building lightning protection system cannot be used as the grounding electrode required for a building electrical power system; however, can it be used as the grounding electrode for a separately derived system?

Question asked by Terry Super on Jan 31, 2017
Latest reply on Feb 1, 2017 by Brian Baughman

We're adding a separately derived system (step-down transformer) on the roof of a building that has a lightning protection system installed.  Can the separately derived system be grounded by bonding to the lightning protection system or does it need a separate grounding electrode conductor to a grounding electrode?

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