Lightning protection guide by OBO

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Last revision 2020

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

Strana 197 z 288

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5 the cables are longer than 0. Solution options: • Installation second SPD near to the resource protected • Use wiring • Local equipotential bonding (e.5 wiring must selected. with the metal housing the switchgear cabinet) TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 197 Chapter The internal lightning protection system .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 V wiring surge arrestor according IEC 60634-5-53 lightning current Utotal = surge voltage protection device) The connection cable the protection device cru- cial for achieving optimum protection level.g. In accordance with IEC installation directives, the length the branch cable the arrestor and the length the line from the protection device the equipotential bonding should, total, less than 0. A pulse current 8/20 gener- ates voltage drop per metre of cable