Hazardous Locations

Area Certificate
North America UL
International IECEx
Europe ATEX
China CNEx(CQST)

North American: UL

Environment of explosive substances
Class I Combustible gas、transpiration or liquid substances
Class II Combustible dust
Class III Combustible fiber or suspension


Frequency and period of existence of hazardous substances
Division 1 Flammable or explosive substances under normal circumstances continuous or recurrent exist
Division 2 Flammable or explosive substances under normal circumstances continuous or recurrent exist seldom


Classification Characteristics of the types of hazardous substances
Class I Group A Acetylene
Group B Hydrogen
Group C Ethylene
Group D Propane
Class II Group E Metal dust
Group F Coal dust
Group G Cereal dust

International: IECEx, ATEX

Frequency and period of existence of explosive substances North America
Zone 0 An area in which an explosive mixture is continuously present or present for long periods Class I
Division 1
Zone 1 An area in which an explosive mixture is likely to occur in normal operation
Zone 2 An area in which an explosive mixture is not likely to occur in normal operation and if it occurs it will exist only for a short time Class I
Division 2
Zone 20 An area in which an explosive mixture is continuously present or present for long periods Class II
Division 1
Zone 21 An area in which an explosive mixture is likely to occur in normal operation
Zone 22 An area in which an explosive mixture is not likely to occur in normal operation and if it occurs it will exist only for a short time Class II
Division 2


Characteristics of hazardous substances
Group IIC Acetylene and Hydrogen
Group IIB Ethylene
Group IIA Propane
Group IIIC Conductibility dust
Group IIIB Dielectric dust
Group IIIA Explosive dust

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