Classification of areas. Explosive gas atmospheres Applying protective measures in potentially explosive atmospheres saves lives. Reduce the risks of working with gases and vapours in hazardous areas with this revised part of the series. What is BS EN ? Explosive gas atmospheres sets out the essential criteria against which ignition hazards can be assessed, and gives guidance on the design and control parameters which can be used in order to reduce such hazards. BS EN focuses on the classification of areas where flammable gas or vapour hazards may arise.
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This standard applies to electrical apparatus where the rated voltage does not exceed 11kV r. Additional measures are applied to ensure that the apparatus does not produce arcs, sparks, or excessive temperatures in normal operation or under specified abnormal conditions. Part 28 of BS EN explains the potential ignition hazard from equipment using optical radiation intended for use in explosive gas atmospheres. It also covers equipment, which itself is located outside but its emitted optical radiation enters such atmospheres.
It describes precautions and requirements to be taken when using optical radiation transmitting equipment in explosive gas atmospheres. It also outlines a test method that can be used to verify a beam is not ignition-capable under selected test conditions, if the optical limit values cannot be guaranteed by assessment or beam strength measurement.
It covers the following ignition mechanisms: Optical radiation is absorbed by surfaces or particles, causing them to heat up and, under certain circumstances, this may allow them to attain a temperature that will ignite a surrounding explosive atmosphere. Direct laser-induced breakdown of the gas at focus of a strong beam, producing plasma and a shock-wave both eventually acting as the ignition source.
These processes can be supported by a solid material close to the breakdown point. The standard 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 not covered.
BS EN 60079-1
BS EN 60079-7:2007