ISO/IEC 80079-20-2:2016

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Dust sample requirements
5 Combustible dusts and combustible flyings determination
6 Procedure for characterisation of combustible dust or
  combustible flying
7 Test methods for determination of whether a material is a
  combustible dust or a combustible flying
8 Test methods for combustible dust determinations
Annex A (normative) - Measurement of temperature distribution on
        the surface of the hot plate
Annex B (informative) - Godbert-Greenwald oven (GG)
Annex C (informative) - Examples of spark-generating systems
Annex D (normative) - Vertical tube (modified Hartmann tube)
        apparatus
Annex E (informative) - 20-litre sphere
Annex F (informative) - BAM oven
Annex G (informative) - Data for dust explosion characteristics
Annex H (informative) - 1 m[3] vessel
Bibliography

ISO/IEC 80079-20-2:2016 is published as a dual logo standard and describes the test methods for the identification of combustible dust and combustible dust layers in order to permit classificationof areas where such materials exist for the purpose of the proper selection and installation of electrical and mechanical equipment for use in the presence of combustible dust. The standard atmospheric conditions for determination of characteristics of combustible dusts are:- temperature -20 C to 60 C,- pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar) and- air with normal oxygen content, typically 21 % v/v. The test methods defined do not apply to:- recognized explosives, propellants (e.g. gunpowder, dynamite), or substances or mixtures of substances which may, under some circumstances, behave in a similar manner or- dusts of explosives and propellants that do not require atmospheric oxygen for combustion, or to pyrophoric substances. This first edition cancels and replaces the first edition of IEC 61241-2-1 published in 1994, the first edition of IEC 61241-2-2 published in 1993 and the first edition of IEC 61241-2-3 published in 1994, combining the requirements into a single document, and is considered to constitute a technical revision. Significant changes with respect to IEC 61241-2-1:1994, IEC 61241-2-2:1993 and IEC 61241-2-3:1994 can be found in the foreword of the document. Keywords: combustible dust