Hazardous-Area Motors: A Deep Dive into Gas Groups IIA & IIB - Technical knowledge center article illustration

Hazardous-Area Motors: A Deep Dive into Gas Groups IIA & IIB

Hazardous locations are categorized based on the frequency and duration of explosive gas atmospheres:

  • Zone 0: Constant or long periods of exposure
  • Zone 1: Likely to occur in normal operation
  • Zone 2: Unlikely and for short duration
 

Gas Groups

  • IIA: Propane, ethanol, acetone
  • IIB: Ethylene, carbon monoxide
  • IIC: Hydrogen, acetylene

Temperature Classes: T1 (450°C) to T6 (85°C), with T3/T4 being common for IIA/IIB.

 

CG Power Motor Types for Hazardous Areas

 
  • Ex d (Flameproof): Withstands internal explosion and prevents propagation. Suitable for Zone 1 & 2, IIA/IIB, T4.
  • Ex e (Increased Safety): No arcing or sparking parts. Designed for Zone 2.
  • Ex nA (Non-sparking): Safe for Zone 2; no flameproof enclosure needed.
 

Technical Highlights of CG Flameproof Motors

 
  • Heavy-duty steel enclosures with precision-machined flamepaths
  • Voltage: 415V to 11kV | Power: 0.37 kW to 2000 kW
  • IP55 standard protection; optional IP66
  • Class F insulation, Class B temp rise
  • Certified by BASEEFA, ATEX, CMRI, DGMS
 

Gas Group Comparison

 
Group Examples Severity Typical Use
IIA Propane, Ethanol Low Solvent plants, Paint shops
IIB Ethylene, CO Medium Refineries, Fertilizers
IIC Hydrogen, Acetylene High Pharma, Labs, Defense
 

How Bombay Engineering Syndicate Supports You

 
  • Technical Matching: We help map your gas group, temp class, and protection needs
  • Certification Support: ATEX, DGMS, CMRI documentation provided
  • Custom Options: Top-terminal boxes, IP66 enclosures, VFD-ready builds
  • Expertise: Decades of experience in hazardous zone equipment supply
 

Typical Use Case

 

Scenario: Zone 1 ethylene unit (Gas Group IIB) requires 30 kW motors, T4 rating.

Solution: CG Ex d 160L frame flameproof motor, 415V, IP55, Class F, IIB + T4 certified, BASEEFA-approved.

 

Final Thoughts

 

Proper motor selection for hazardous zones is critical. Bombay Engineering Syndicate ensures you receive certified, compliant, and fit-for-purpose motors from CG Power—supported by accurate specifications and documentation.

 

Contact us today to evaluate your hazardous area project and get expert recommendations.

 

By: Manish Chandrani; +919825014977