Lightning protection guide by OBO

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Last revision 2020

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

Strana 190 z 288

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• Surge voltage damage frequently occurs re- sources operated power and data/telephone networks.Exposed cable supply Buildings with exposed cable supply must pro- tected with type SPDs, even the supply cable is run between the last mast the exposed cable and the building earth cable. Exposed cable supply Sensitive device SPD (type type 1+2) Main earthing busbar (MEB) Metal cable Power supply (L1, L2, and PEN) TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 190 Chapter The internal lightning protection system . Low-voltage cable networks require protection against surge voltages atmospheric origin and switching surges due the following reasons: • Surge voltages are not weakened attenuated suf- ficiently earthing cables. If surge protection used for the low-voltage system, then suitable surge protection devices (SPD) should be used for the telecommunications and data sys- tems. • The use control and communication equipment is continually increasing