IEC 60079-10-2:2026 pdf download,Explosive atmospheres – Part 10-2: Classification of areas – Explosive dust atmospheres.
IEC 60079-10-2:2026 specifies methods for identifying and classifying hazardous areas where explosive dust clouds or combustible dust layers may occur. Its purpose is to support ignition-risk assessment and the appropriate selection, installation, and use of equipment for explosive dust atmospheres.
The document explains how to evaluate combustible materials, dust characteristics, potential release sources, release frequency and duration, ventilation, housekeeping, dust accumulation, and the extent of hazardous areas. It distinguishes explosive dust clouds from combustible dust layers: dust clouds are addressed primarily in the area-classification process, while dust layers are considered both as potential release sources and as hazards capable of self-heating, igniting on hot surfaces, or generating secondary dust clouds.
Areas are classified according to the likelihood and duration of an explosive atmosphere, generally as Zone 20, Zone 21, or Zone 22. The standard also provides principles applicable to combustible fibres and flyings, and may assist in evaluating hybrid mixtures involving flammable gases or vapours.
Its assumptions include normal atmospheric oxygen concentration and conditions near standard pressure and temperature, where changes do not significantly affect material explosibility. The scope excludes underground mining, domestic and medical premises, certain oxygen-independent explosives, catastrophic failures, and consequential damage after fire or explosion. Effective housekeeping is assumed unless the assessment demonstrates otherwise.