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Explosive atmospheres - Part 28: Protection of equipment and transmission systems using optical radiation
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Available format(s): Hardcopy, PDF
Language(s): Spanish, Castilian, English
Published date: 06-04-2016
Publisher: Asociacion Espanola de Normalizacion
INTRODUCTION1 Scope2 Normative references3 Terms and definitions4 General requirements 4.1 Optical equipment 4.2 Risk levels5 Types of protection 5.1 General 5.2 Requirements for inherently safe optical radiation 'op is' 5.3 Requirements for protected optical radiation 'op pr' 5.4 Optical radiation interlock with optical fibre breakage 'op sh' 5.5 Suitability of types of protection6 Type verifications and tests 6.1 Test set-up for ignition tests 6.2 Reference test 6.3 Test mixtures 6.4 Tests for pulse trains and pulses between 1 ms and 1 s duration7 Marking 7.1 General 7.2 Marking information 7.3 Examples of markingAnnex A (normative) - Reference test dataAnnex B (informative) - Ignition mechanismsAnnex C (normative) - Ignition hazard assessmentAnnex D (informative) - Typical optical fibre cable designAnnex E (informative) - Introduction of an alternative risk assessment method encompassing 'equipment protection levels' for Ex equipmentAnnex ZA (normative) - Normative references to international publications with their corresponding European publicationsAnnex ZZ (informative) - Coverage of Essential Requirements of EC DirectivesBibliography
Describes the potential ignition hazard from equipment using optical radiation intended for use in explosive gas atmospheres. Also covers equipment, which itself is located outside but its emitted optical radiation enters such atmospheres.
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