Code Q&A

Is it good practice to bond the lightning protection system to the building grounding electrode system?

Q. Is it good practice to bond the lightning protection system to the building grounding electrode system?

A. The Code requires the lightning protection system, if provided on a premise, to be bonded to the building or structure grounding electrode system [250.106]. This bonding connection is designed to minimize the difference of potential between the lightning protection system and the electrical system, which should reduce arcing between metal parts within the building.

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