Lightning protection guide by OBO

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Last revision 2020

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

Strana 233 z 288

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fault coupled onto a signal-carrying wire, will couple onto the second wire well. In symmetrical data transmission, instead one data cable, two data cables are used carry signal, for example the case Twisted Pair cables.1.3. Due the phase difference, the interfer- ence signal virtually cancelled out. The protection class marked many OBO surge protection devices. For example, with ADSL, data can be downloaded faster than they can uploaded. These terms refer the symmetry synchronicity the data rate. Supply lines such energy and data cables often run through all the zones. TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 233 Chapter The internal lightning protection system . In SDSL the two data rates are the same. The terms (a)symmetrical and (a)synchronous are also used in relation transmission systems such DSL. 3. this case the signal voltage changes relation reference potential/earth.3. The aim these LPZs reduce the amplitude the lightning current/surge voltage individual zones to at least value the voltage resistance the devices in that zone.6 Symmetrical and asymmetrical data transfer Asymmetrical interfaces consist data conductor and earth wire.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 Asymmetrical cable Cable jacketing Insulation wire A Insulation wire B Conductors wires A/B Symmetrical cable Energy cable Data cable Equipotential bonding system Cables passing through all lightning protection zones 3. The two wires are 180° out phase. During downlink/download, the data rate generally differs considerably from that during up- link/upload.7 Device protection classes Objects risk from lightning and surge voltage are classified into lightning protection zones (LPZs).1. A suitable surge protection device must chosen for each zone