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Showing posts with the label NFPA 780

Lighting Protection system for 23 m or 75 ft height exceeding building

General Information Class II Materials:   Lighting Conductors, air terminals, grounding electrodes and other associated fittings required for the protection of structures exceeding 23m (75 ft) in height. Reference:   NFPA 4.1.1.1 (B)                       Table 4.1.1.1 (B)               NFPA 780 Factory Details Height of the building 80ft or 24.386m m Roof perimeter 358 m NFPA 780 General Requirements: 1.       Air terminals are places at the locations indicated, not more than 2’-0” from the edges of ridges, outside corners, or outside edges of main roofs and must extend a minimum of 24” above object to be protected. 2.       Air terminals are spaced at 50’-0” O.C. Maximum spacing. 3.       All structural steel, rebar, framing and miscellaneous steel are made electrically continuous through construction. 4.       Air terminals 24” and over are spaced 25 feet maximum. 5.       One down conductor are p