ISA 60079-10-2 : 2013

1 Scope
2 References
3 Terms and definitions
4 Area classification
5 Sources of release
6 Zones
7 Dust layer hazard
8 Documentation
Annex A (informative) - Area classification application
Annex B (informative) - Risk of fire from hot surface ignition
        of dust layer
Annex C (informative) - Housekeeping
Annex D (informative) - Introduction of an alternative risk
        assessment method encompassing 'equipment protection
        levels' for Ex equipment
Annex E (informative) - U.S National Differences
Bibliography

ANSI/ISA-60079-10-2 (12.10.05)-2013, Explosive Atmospheres – Part 10-2: Classification of areas – Combustible dust atmospheres, focuses on classifying hazardous areas related to combustible dust atmospheres. This standard offers guidance for identifying and classifying locations where explosive dust clouds or combustible dust layers may be present, aiming to evaluate ignition risks and implement proper safety measures. It defines zones 20, 21 and 22 based on the frequency and duration of explosive dust atmospheres, describes sources and grades of dust releases and emphasizes the importance of effective housekeeping to control dust layers. It introduces dust groups, outlines documentation requirements and includes annexes with practical examples, risk assessment methods using equipment protection levels (EPLs) and US national deviations aligned with the National Electric Code (NEC).