Lightning protection guide by OBO

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Last revision 2020

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

Strana 188 z 288

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sub-distributor Final circuit Main earthing busbar (MEB) Local equipotential busbar (PAS), optional Type (class lightning arrestor Type (class II) surge protection devices (SPDs) Type (class III) surge protection devices (SPDs) 5-wire networks, TN-S and network system Advantages the 3+1 circuit: •Universally suitable for and networks •Insulating spark gap between neutral conductor (N) and earth (PE) •Low protection level between phase (L) and neutral conductor (N) •Use front the protection switch (RCD) also approved net- work TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 188 Chapter The internal lightning protection system . System fuse F1 Cable length between arrestors Circuit distribution board, e. Usage de- scribed IEC 61643-11.5-wire networks, TN-S and network system In the TN-S network system, the electrical unit sup- plied through the three external lines (L1, L2, L3), the neutral cable (N) and the earth cable (PE). the TT network, however, the electrical unit supplied through the three external lines (L1, L2, L3), the neut- ral cable (N) and the earth cable (PE).g