NFPA 780: Standard for the Installation of Lightning by Nfpa

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Additional resources for NFPA 780: Standard for the Installation of Lightning Protection Systems, 2011 Edition

Example text

3. ) connected to ground by at least one down conductor. 3 Ground Ring Electrodes. Ground ring electrodes shall be uninsulated conductors meeting or exceeding the requirements for Class II conductors. 3 For nonmetallic masts using a pole guy wire as a down conductor, the guy wire shall be a continuous metal cable without any ceramic or insulating sections. 4. 4 Each metallic guy cable shall be bonded at its lower end to the grounding electrode(s). 2 Grounding of Masts. 9 m (3 ft) from the structure foundation or footing.

1 Copper conductors shall be tinned. 2 All copper conductors shall be of the grade required for commercial electrical work and shall have at least 95 percent of the conductivity of pure copper. 3 The use of conducting materials other than copper, such as aluminum, stainless steel, and bronze, shall be permitted, provided they meet all requirements in this chapter. 4* Carbon fiber composite (CFC) shall not be used as a conductor in a lightning protection system. 3 Strike Termination. 1* Zone of Protection.

1 Application. This chapter shall provide the minimum requirements for lightning protection of structures housing explosive materials. 3 kg (25 lb) or less, or where exclusion is justified by a risk assessment. 2 This chapter shall not apply to structures where the protection conflicts with airfield or flightline operations, as determined by the AHJ. 1 Metallic (Faraday-Like) Cage. 2 Single or Multiple Masts. 5, using a striking distance of 30 m (100 ft) radius. rods, and other grounding systems connected to the ground ring conductor.

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