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EN IEC 60079-28:2026

Explosive atmospheres - Part 28: Protection of equipment and transmission systems using optical radiation

Edition date: 2026-02-13
In Force
Available languages: French, English
Summary: IEC 60079-28:2025 specifies additional requirements for Ex Equipment, Ex associated equipment or Ex Components containing optical systems emitting optical radiation, which is exposed to explosive atmospheres. These additional requirements are applicable for all equipment groups and all Equipment Protection Levels (EPL). This document contains requirements for optical radiation in the wavelength range from 380 nm to 10 µm. It covers the following ignition mechanisms: • Optical radiation is absorbed by surfaces or particles, causing them to heat up, and under certain circumstances this might allow them to attain a temperature which will ignite a surrounding explosive atmosphere. • In rare special cases, direct laser induced breakdown of the gas at the focus of a strong beam, producing plasma and a shock wave both eventually acting as ignition source. These processes can be supported by a solid material close to the breakdown point. • Annex A provides guidance when considering ignition mechanisms that influence the hazard of optics in explosive atmospheres. This document applies to a) laser equipment; and b) optical fibre equipment; and c) any optical system that converts light into convergent beams with focal points within the hazardous area only. This document does not apply to: d) laser equipment for EPL Mb, Gb, Gc, Db or Dc applications which complies with Class 1 limits in accordance with IEC 60825-1; or e) Single or multiple optical fibre cables not part of optical fibre equipment if the cables: 1) comply with the relevant industrial standards for optical fibre cables, along with additional protective means, for example robust cabling, conduit or raceway (for EPL Gb, Db, Mb, Gc or Dc); or 2) comply with the relevant industrial standards for optical fibre cables (for EPL Gc or Dc); or f) Optical radiation sources as defined in i) to iii) above where the optical radiation is fully contained in an enclosure complying with one of the following Types of Protection suitable for the EPL, or the minimum ingress protection rating specified: 1) flameproof "d" enclosures (IEC 60079-1); or 2) pressurized "p" enclosures (IEC 60079-2); or 3) restricted breathing "nR" enclosure (IEC 60079-15); or 4) dust protection "t" enclosures" (IEC 60079-31); or 5) an enclosure that provides a minimum ingress protection of IP 6X and where no internal absorbers are to be expected and complying with "Tests of enclosures" in IEC 60079-0. This document does not cover ignition by ultraviolet radiation and by absorption of the radiation in the explosive mixture itself. Explosive absorbers or absorbers that contain their own oxidizer as well as catalytic absorbers are also outside the scope of this document. This document supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this document conflicts with a requirement of IEC 60079-0, the requirement of this document takes precedence. This third edition cancels and replaces the second edition published in 2015. This edition constitutes a technical revision

IEC 60079-28:2025 spécifie les exigences supplémentaires applicables aux appareils Ex, aux appareils associés Ex ou aux composants Ex contenant des systèmes optiques émettant un rayonnement optique, qui sont exposés à des atmosphères explosives. Ces exigences supplémentaires s'appliquent à tous les groupes d'appareils et à tous les niveaux de protection du matériel (EPL, Equipment Protection Levels). Le présent document contient les exigences relatives aux rayonnements optiques dans la plage de longueurs d'onde comprise entre 380 nm et 10 µm. Il couvre les mécanismes d'allumage suivants: – le rayonnement optique est absorbé par les surfaces ou particules, provoquant leur échauffement et, dans certaines circonstances, celles-ci peuvent atteindre une température qui amorce l'inflammation de l'atmosphère explosive environnante; – dans certains cas rares particuliers, le craquage direct d'un gaz par laser, au point de focalisation d'un faisceau puissant, produisant un plasma et une onde de choc, les deux agissant en définitive comme source d'inflammation. Ces processus peuvent prendre naissance dans un matériau solide proche de son point de craquage; – Annexe A fournit des recommandations lors de l'examen des mécanismes d'inflammation qui influencent le danger optique dans les atmosphères explosives. Le présent document s'applique: a) aux équipements laser; et b) aux équipements à fibres optiques; et c) à tout système optique qui convertit la lumière en faisceaux convergents avec des points focaux situés dans la zone dangereuse uniquement. Le présent document ne s'applique pas: d) aux équipements laser pour les applications EPL Mb, Gb, Gc, Db ou Dc qui satisfont aux limites de Classe 1 conformément à l'IEC 60825-1; e) aux câbles à fibres optiques simples ou multiples ne faisant pas partie des équipements à fibres optiques si les câbles: 1) satisfont aux normes industrielles pertinentes pour les câbles à fibres optiques, ainsi que les moyens de protection supplémentaires, comme les câblages robustes, les conduits ou les chemins (pour EPL Gb, Db, Mb, Gc ou Dc); ou 2) satisfont aux normes industrielles pertinentes pour les câble à fibres optiques (pour EPL Gc ou Dc); ou f) aux sources de rayonnement optique telles que définies aux points a) à c) ci-dessus, lorsque le rayonnement optique est totalement contenu dans une enveloppe satisfaisant à l'un des modes de protection suivants adaptés à l'EPL, ou à la caractéristique assignée minimale de protection contre les pénétrations spécifiée: 1) les enveloppes "d" antidéflagrantes (IEC 60079-1); ou 2) des enveloppes "p" sous pression (IEC 60079-2); ou 3) une enveloppe "nR" à respiration limitée (IEC 60079-15); ou 4) les enveloppes "t" de protection contre la poussière (IEC 60079-31); ou 5) une enveloppe qui fournit une protection minimale contre la pénétration IP 6X et lorsqu'aucun absorbeur interne n'est attendu, et qui satisfait aux "Essais des enveloppes" de l'IEC 60079-0. Le présent document ne couvre pas l'inflammation par rayonnement ultraviolet et par absorption du rayonnement dans le mélange explosif lui-même. Les absorbeurs explosifs ou absorbeurs qui contiennent leur propre oxydant/comburant de même que les absorbeurs catalytiques sont également hors du domaine d'application du présent document. Le présent document complète et modifie les
ICS: 29.260.20-Electrical apparatus for explosive atmospheres
CTN: CLC/TC 31 - 1257157

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