Explosive atmospheres - classification of hazardous areas (zoning) and selection of equipment

Gases, vapours, mists and dusts can all form explosive atmospheres with air. Hazardous area classification is used to identify places where, because of the potential for an explosive atmosphere, special precautions over sources of ignition are needed to prevent fires and explosions.
Overview
Assessing the risk
Relationship between fires and explosions
Classifying hazardous areas into zones
Maintenance
Equipment in hazardous areas
Marking of equipment
Selection of equipment
Hazardous area zones and equipment categories
Pages 8.