Lightning protection guide by OBO

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Last revision 2020

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

Strana 143 z 288

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5 hrs, shorter than hrs Zone Zone 22: Normally short form- ation potentially explosive atmospheres ≥ 1x, < 10x ≥ 1x/year, < 1x/month Shorter than 0.000x Greater than for Zone 1, > 3x/day Longer than for Zone 1 Zone Zone 21: Occasional formation of potentially explosive atmospheres ≥ 10x, < 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 2.5 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. These zones are always three-dimensional areas three- dimensional space. A further subdivision the potentially explosive areas makes distinction between combustible gases and combustible dusts.3.000x ≥ 1x/month, < 3x/day Longer 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. Zone 1 In Zone normal operation, atmosphere can occasionally form mixture air combustible gases, va- pours mist. Zone 2 In Zone normal operation, potentially explosive atmosphere can normally not, only briefly, form mix- ture air combustible gases, vapours mist. 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. 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. 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.2 Assignment the zones Potentially explosive areas are divided into zones according the duration and frequency the occur- rence potentially explosive atmospheres