Lightning protection guide by OBO

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Last revision 2020

Vydal: OBO BETTERMANN s. r. o. Autor: OBO BETTERMANN

Strana 77 z 288

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0 0. agricultural area Terrain category III Suburbs, industrial commercial areas; forests Terrain category IV Urban areas which least 15% the area built with buildings whose average height higher than m Table 2.9) The standards contain statements regarding the following aspects: • Framework masts and towers with non-parallel main legs • Guyed masts and chimneys • Cable-stayed and suspension bridges • Torsional vibrations Wind zones Germany per DIN 1991-1-4 NA (country-specific) Zone Wind speed in m/s Speed pressure in kN/m² 1 22.10: Terrain categories according DIN 1991-1-4 TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 77 Chapter The external lightning protection system .5 0.10).32 2 25.0 0.9: Basic speeds and speed pressures (state-spe- cific data) 2nd step: Determining the terrain category (TC) Terrain-specific loads and dynamic pressures are the second factor calculating wind loads (Table 2.5 0. (Table 2.39 3 27.56 Table 2.TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 1st step: determining the wind zone The second factor that needs known when de- termining the wind load the wind load zone which the object located.47 4 30. Terrain category (TC) Definition Terrain category I Open sea; lakes with least open water the wind direction; even, flat land without obstacles Terrain category II Terrain with hedges, individual farmsteads, buildings trees, e.g