Considerations in Hazardous areas

Design and equipment selection for use in hazardous areas will be influenced by :-

  • the area classification
  • the gas (or dust) group
  • the temperature classification and equipment selected providing an appropriate type of protection

As stated above, this document focuses on the international standards developed especially for the electric heat tracing, IEC62395 - for Safe Industrial locations and IEC60079-30 - for Hazardous locations.

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Area Classification

The probability of explosive conditions being present is defined by zone classification

  • Zone 0 may have explosive gas-air mixture present continuously or for long periods. Heat tracing is rarely, if ever, used in Zone 0 areas.
  • Zone 1 may have explosive gase-air mixtures present in normal operation.
  • Zone 2 may have explosive gas-air mixture present only under abnormal conditions.

North American hazardous locations are categorised in Divisions rather than Zones. As stated above, IEC60079 and IEEE515 are being harmonised as a dual-logo standard. Therefore ETHIC's members product approvals will often cater for both Division and Zones.

Gas Groups

Gas Groups

Gas Groups relevant to heat tracing in hazardous locations are :-

  • IIA - Acetone, benzene, butane, ethane, methane, propane, etc.
  • IIB - Ethylene, towns gas, etc.
  • IIC - Acetylene, hydrogen

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