Hazardous area

What is an explosive hazardous area?

Explosives hazardous areas occur where flammable liquids, vapors, gases or combustible dusts are likely to occur in quantities sufficient to cause a fire or explosion. Often, these atmospheres are created where gas, vapors, dusts and liquids are in contact with oxygen. Hazardous areas are divided into zones, where the probability of a hazardous atmosphere being present governs the explosion risk. Some areas are more hazardous than others, since it is more likely that there are gasses present. There are explosive gas atmospheres, explosive dust atmospheres, and the explosive atmospheres which may exist in coal mines.

ATEX directive

Classification of equipment in explosive atmospheres

For explosive atmospheres from gases and vapours, these zones would be Zone 2, Zone 1, and Zone 0. For explosive atmospheres from dust, the zones are Zone 22, Zone 21, and Zone 20. Each zone classification depends on the level of risk with Zone (2)2 being the least risky and Zone (2)0 being the most. With the ATEX Directive, all electrical equipment is classified according to these zones and thus certifies in which areas it can be safely used.

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