Lightning protection guide by OBO

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Last revision 2020

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

Strana 219 z 288

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8 kV < V < 600 V Table 3. Because surge voltages can occur even without light- ning, for example due switching operations the supply network, terminal devices and cables always need have certain amount voltage resistance to enable the device cable remain operation following brief surge voltage.9: Voltage resistance components TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 219 Chapter The internal lightning protection system . The following table shows typical voltage resistance values for common terminal devices/cables.5 kV 2 kV < V < 800 V Jumper wire telecoms distribution board 2.5 kV <120 V <700 V Installation data cable J-Y(ST)Y • Wire-wire • Wire-shield 0.5 kV Profibus cable 1.3.1. Electrical components have spe- cific voltage resistance. Transients and light- ning currents can transmitted the lightning dir- ectly, via cables which interference factors are already coupled.5 kV 2.5 kV 2 kV < V < 800 V Installation cable tube wire intercoms • Wire-wire • Wire-shield 1 kV 1 kV < V < 600 V CAT7 cable • Wire-wire • Wire-shield 2.5 600 V Measurement/control terminals 600 V Telephone device cable (star quad) • Wire-wire • Wire-shield 0.8 kV 0.5 kV 2 kV < 300 V < 300 V Installation cable telecommunication systems (F-vYAY) • Wire-wire • Wire-shield 0. Application Typical voltage resistance OBO surge protection protection level Telecoms terminals/devices 1.5 800 V 50 Ohm coaxial cable 800 V 75 Ohm SAT coaxial cable 800 V J BMK (JB-YY) fire alarm cable • Wire-wire • Wire-shield 0.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 3.2 Interference information technology sys- tems Lightning currents and surge voltages can coupled into data cables different ways