IEC 60079-10-1:2020 pdf download,Explosive atmospheres – Part 10-1: Classification of areas – Explosive gas atmospheres.

IEC 60079-10-1:2020 describes how to classify hazardous areas in which flammable gases or vapours may form explosive atmospheres. It provides a framework for identifying those locations so that the correct selection, design, installation, operation, and maintenance of “Ex” equipment can be based on the actual ignition risk in the plant. The standard applies to places where ignition hazards can arise from flammable gas/vapour mixed with air, but it does not cover certain special cases (for example, firedamp mines, explosive manufacturing, and other specific exclusions).

A core purpose of the standard is to determine two things for each release source: the type of hazardous zone and its extent. Classification is done by analyzing each potential release source, considering the likelihood and duration of the release, and assigning one of the zone categories (Zone 0, Zone 1, Zone 2) or a non-hazardous area. The methodology uses concepts such as continuous, primary, and secondary grades of release to relate release scenarios to the zoning outcome. The result is a zone map or classification basis that can be used for safer equipment selection and electrical installation practices in hazardous locations.