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Area classification is an engineering study that defines the regions where an explosive atmosphere can occur. It is done considering the flammable substances' characteristics, the process' pressure, flow and temperature, and ventilation aspects.
Where the possibility of an explosive atmosphere is related with the normal operation of the plant, the place is "Zone 1"; if the possibility is only related to abnormal operations, the place is "Zone 2"; if a continuous emission of flammable atmosphere occurs, the place is classified as "Zone 0" , as defined by IEC 60079-10 standard.
In the US, a hazardous area resulting from a gas is Class 1 and resulting from a solid particle or dust is Class 2. If the hazard may be present during normal operations it is Division 1; during abnormal conditions only, it is Division 2.
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