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Electrical apparatus for use in the presence of combustible dust - Part 10: Classification of areas where combustible dusts are or may be present

Executive summary

Classification of areas in which explosive dust/air mixtures and combustible dust layers are present and proper selection of equipment for use in such areas.

Abstract

This part of EN 61241 is concerned with the classification of areas in which explosive dust/air mixtures and combustible dust layers are present, in order to permit the proper selection of equipment for use in such areas.

This European Standard treats explosive dust atmospheres and combustible dust layers separately. Area classification for explosive dusts clouds is described, with dust layers acting as one of the possible sources of release. The hazard of dust layer ignition is also described.

This standard assumes effective housekeeping based on a system of cleaning for the plant. The principles of this standard can also be followed when combustible fibres or flyings may cause a hazard. This standard is intended to be applied where there can be a risk due to the presence of explosive dust/air mixtures or combustible dust layers under normal atmospheric conditions.

It does not apply to

– underground mining areas,

– areas where a risk can arise due to the presence of hybrid mixtures,

– dusts of explosives that do not require atmospheric oxygen for combustion, or to

pyrophoric substances,

– catastrophic failures which are beyond the concept of abnormality dealt with in this

standard,

– any risk arising from an emission of flammable or toxic gas from the dust.

This standard does not take into account the effects of consequential damage following a fire or an explosion.

History and related standards

This European Standard supersedes BS EN 50281-3:2002 which is withdrawn.

This standard includes the following cross-references:

IEC 61241-0 and IEC 61241-14.

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