Lightning protection guide by OBO

| Kategorie: Katalog  |

Last revision 2020

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

Strana 143 z 288

Jak získat tento dokument?






Poznámky redaktora
Zone 2 In Zone normal operation, potentially explosive atmosphere can normally not, only briefly, form mix- ture air combustible gases, vapours mist. Intervals the occurrence potentially explosive atmospheres Level risk Interval occurrences of mixtures (annual) Interval occurrences of mixtures (differentiated) Dwell times the mixtures Zone Zone 20: Constant frequent form- ation potentially explosive atmospheres Greater than for Zone 1, > 1. TBS Blitzschutz-Leitfaden 2018 / en / 2020/01/10 14:42:40 14:42:40 (LLExport_02613) / 2020/01/10 14:42:54 14:42:54 143 Chapter The external lightning protection system .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 2. Zone 22 In Zone 22, normal operation, dangerous, potentially explosive atmosphere can normally not, only briefly, form the form cloud combustible dust contained the air.5 hrs, shorter than hrs Zone Zone 22: Normally short form- ation potentially explosive atmospheres ≥ 1x, < 10x ≥ 1x/year, < 1x/month Shorter than 0. Zone 21 In Zone 21, normal operation, dangerous, potentially explosive atmosphere can form occasionally the form of cloud combustible dust contained the air.5 hrs Definition zones Ex zones Description Zone 0 In Zone normal operation, dangerous, potentially explosive atmosphere can form over longer periods at regular intervals mixture air combustible gases, vapours mist. A further subdivision the potentially explosive areas makes distinction between combustible gases and combustible dusts. Zone 1 In Zone normal operation, atmosphere can occasionally form mixture air combustible gases, va- pours mist.2 Assignment the zones Potentially explosive areas are divided into zones according the duration and frequency the occur- rence potentially explosive atmospheres. Zone 20 In Zone 20, normal operation, dangerous, potentially explosive atmosphere can form over longer periods at regular intervals the form cloud combustible dust contained the air.000x Greater than for Zone 1, > 3x/day Longer than for Zone 1 Zone Zone 21: Occasional formation of potentially explosive atmospheres ≥ 10x, < 1.000x ≥ 1x/month, < 3x/day Longer than 0.3. These zones are always three-dimensional areas three- dimensional space