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Class 1 Div1

Class I Division 1 refers to a hazardous location where flammable gases, vapors, or mists are present continuously, intermittently, or under normal operating conditions in concentrations that can ignite. 

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Highlights

ATEX & IECEx Certification Codes  
  • ATEX: II 2G Ex ia IIC T4 Gb 
  • IECEx: Ex ia IIC T4 Gb 
What It Means 
  • Class I – Hazard due to flammable gases or vapors (e.g., hydrogen, methane, propane, gasoline vapors) 
  • Division 1 – The hazard exists during normal operations or may exist frequently due to maintenance, leaks, or process conditions 
Typical Environments 
  • Oil & gas refineries and wellheads 
  • Chemical processing plants 
  • Fuel storage and transfer areas 
  • Paint spray booths 
  • Solvent handling and mixing zones 
Equipment Requirements  Only intrinsically safe or explosion-proof equipment that is certified for Class I Division 1 (and/or ATEX/IECEx equivalent) is permitted. Devices must be designed to prevent ignition even in the presence of an explosive atmosphere. 

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