NFPA 780 - 2017

Standard for the Installation of Lightning Protection Systems

1.1 Scope.

1.1.1 This document shall cover traditional lightning protection system installation requirements for the following:

(1) Ordinary structures

(2) Miscellaneous structures and special occupancies

(3) Heavy-duty stacks

(4) Structures containing flammable vapors, flammable gases, or liquids that can give off flammable vapors

(5) Structures housing explosive materials

(6) Wind turbines

(7) Watercraft

(8) Airfield lighting circuits

(9) Solar arrays

1.1.2* This document shall address lightning protection of the structure but not the equipment or installation requirements for electric generating, transmission, and distribution systems except as given in Chapter 9 and Chapter 12.

1.1.3 This document shall not cover lightning protection system installation requirements for early streamer emission

systems or charge dissipation systems.

1.2* Purpose. The purpose of this standard shall be to provide for the safeguarding of persons and property from

hazards arising from exposure to lightning.

1.3 Listed, Labeled, or Approved Components. Where fittings, devices, lightning conductors, air terminals, or other components required by this standard are available as listed or labeled, such components shall be used.

1.4 Retroactivity. The provisions of this standard reflect a consensus of what is necessary to provide an acceptable degree of protection from the hazards addressed in this standard at the time the standard was issued.

1.4.1 Unless otherwise specified, the provisions of this standard shall not apply to facilities, equipment, structures, or installations that existed or were approved for construction or installation prior to the effective date of the standard. Where specified in this standard, the provisions of this standard shall be retroactive.

1.4.2 In those cases where the authority having jurisdiction determines that the existing situation presents an unacceptable degree of risk, the authority having jurisdiction shall be permitted to apply retroactively any portions of this standard deemed appropriate.

1.4.3 The retroactive requirements of this standard shall be permitted to be modified if their application clearly would be impractical in the judgment of the authority having jurisdiction, and only where it is clearly evident that a reasonable degree of safety is provided.

1.5 Mechanical Execution of Work.

1.5.1 Lightning protection systems shall be installed in a neat and workmanlike manner.

1.5.2* The individual(s) responsible for the installation shall be certified for fitness on the requirements of this standard by the authority having jurisdiction.

1.5.3 Where required by the authority having jurisdiction, compliance of the completed installation with the requirements of this standard shall be certified through a physical onsite inspection by a qualified and impartial organization acceptable to the authority having jurisdiction.

1.6* Maintenance. Recommended guidelines for the maintenance of the lightning protection system shall be provided to the owner at the completion of installation.

1.6.1 Periodic Inspection. Periodic inspections or testing for compliance to this standard shall be done at intervals determined by the authority having jurisdiction.

1.7 Units of Measurement.

1.7.1 Measurements shall be presented in inch-pound units followed by the equivalent value presented in SI units in parentheses.

1.7.2 A given equivalent value shall be approximate.

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