Hazardous Area Assessments

Dynelec has a team of experienced Engineers who can assist you with the process of identifying, classifying and treating risks of explosion ignition in hazardous areas.

Ensuring you are prepared for Hazardous Areas

A hazardous area is a confined space where flammable gases, vapours and/or dusts occur. In these areas specialised electrical equipment is required to ensure arcing contacts or high surface temperatures don’t result in an explosion.

Equipment for use in a Hazardous Area is specified in terms of the types of gases/dust is present. These are defined in three groupings:

  • Group I – Underground mining applications
    All equipment used in underground mining applications fall into this category. The represented gas is Methane.
  • Group II – Industries other than mining
    Group II is segmented into three different representative gas groups, IIA, IIB and IIC. These are identified in the table below.
  • Group III – Industries having dust or fibres
    Dusts and fibres are also defined in terms of their ignition properties including dust cloud ignition properties. Equipment is segmented concerning the thickness of the dust – Practice A and B regarding maximum surface temperatures relating to the ignition temperatures of the material. The Group III dusts are segmented into three different representative dusts IIIA, IIIB and IIIC, with the worst case being IIIC for conductive dusts. 

Group Classification and Representative Gas Data 

Group Classification

Representative Gas

I Methane
IIA Propane
IIB Ethylene
IIC Hydrogen, Acetylene

Contact us today to assess the safety and risks that may be present in your hazardous areas.