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Grounding versus Bonding

PART V. BONDING

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250.106 Lightning Protection System.

Where a lightning protection system is installed, the lightning protection system must be bonded to the building or structure grounding electrode system. Figure 250–156

Author’s Comment: The grounding electrode for a lightning protection system cannot be used for the building or structure grounding electrode [250.60]. Figure 250–157

FPN No. 1: See NFPA 780, Standard for the Installation of Lightning Protection Systems for additional details on grounding and bonding requirements for lightning protection.

FPN No. 2: Metal raceways, enclosures, frames, and other metal parts of electrical equipment may require bonding or spacing from the lightning protection conductors in accordance with NFPA 780, Standard for the Installation of Lightning Protection Systems. Separation from lightning protection conductors is typically 6 ft through air, or 3 ft through dense materials, such as concrete, brick, or wood. Figure 250–158


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