Lightning protection guide by OBO

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Last revision 2020

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

Strana 195 z 288

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the lightning protection zone, trans- ition from LPZ LPZ all metal installations must be integrated into the equipotential bonding system.5 Installation requirements The installation standard for surge protection devices, IEC 60364-5-53, covers protection against surge voltages resulting from indirect and remote lightning strikes and switching operations. The ohmic component is negligible compared the inductive component. buildings with external lightning protection system per IEC 62305, type 1 surge protection devices must used connect the supply lines routed from outside the building the lightning protection equipotential bonding the trans- itions between lightning protection zones and 1.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 3. The sum the protection level the surge protection devices and the voltage drop the supply lines must remain below the voltage resistance. The following minimum cross-sections must ob- served for lightning protection equipotential bonding: for copper mm², for aluminium mm² and for iron mm².2. IEC 60364-5-53 recom- mends total length for the connection cable the surge protection device less than 0. Maximum length supply line per IEC 60364-5-53 Main earthing busbar protective conductor rail L1 Supply line protection device L2 Connection between protection device and equipoten- tial bonding Connection length, alternative wiring and cross- sections If the surge protection device tripped surge voltage, the supply lines, fuse and protection device conduct surge current. Active lines must earthed using suitable surge ar- restors. To minimise the voltage drop the supply line, the length, and hence inductance, the cable must be kept low possible. This produces voltage drop at the impedances the lines. The new standards 60364-4-443 and IEC 60364-4-44 de- scribe the decision criteria when and how surge protection measures are required systems and buildings. The standard offers help selecting and installing surge protection devices order reduce downtime in low-voltage systems. ensure adequate protec- tion systems and devices, the maximum surge voltage that can occur must smaller than equal to the surge voltage resistance the devices be protected. Surge protection devices can also known “surge protective devices” and “devices for protection against surges”.3. Minimum cross-sections for lightning protection equipotential bonding The length the connection cable for surge protec- tion devices significant aspect the installation standard IEC 60364-5-53. As 2016, surge protection all new buildings and in electrical installations mandatory for electrical in- stallations conforming with the standard.5 and cer- tainly more than m. Mounting the type 1+2 V50 combination arrestor in the upper meter connection compartment TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 195 Chapter The internal lightning protection system