Lightning protection guide by OBO

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Last revision 2020

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

Strana 75 z 288

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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 75 Chapter The external lightning protection system . Table 2.04 0. 3rd step Calculate the value the coeffi- cient km • Material air: km = 1 • Material concrete, brickwork: km = 0.5 • m Calculation separation distance: s kc/km 0.04 2nd step Calculate the value the coeffi- cient kc (simplified system) • conductor (only the case isolated lightning protection system): kc = 1 • conductors: kc = 0.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 Procedure for calculating the separation distance according DIN 62305-3 1st step Calculate the value the coeffi- cient ki • Protection class ki = 0.7 If several insulating materials are used, practice the lowest value for km is used.44/0. 4th step Calculate the value L L the vertical distance from the point which the separation distance (s) calcu- lated the closest point the equipotential bonding.08 • Protection class II: ki = 0.5 0.44 • 0.5 • OBO GFK insulating rods: km = 0.7: Calculating the separation distance according IEC 62305-3 Example: building structure Initial situation: • Lightning protection class III • Building with more than four down-conductors • Material: concrete, brickwork • Height/point which the separation distance should calculated: m Value determined: • 0.35 m More detailed calculation methods for complex buildings and systems are described IEC/EN 62305-3.44 The values apply all type earthers and those type earthers which the earther resistance the neighbouring earther electrodes does not differ more than a factor the earther resistance individual electrodes deviates more than a factor kc = should assumed.04 • 0.06 • Protection classes III and IV: ki = 0.66 • conductors and more: kc = 0