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Flame proof Gas Group
Group II equipment is subdivided into three subgroups.
Group IIA—Atmospheres containing propane, or gases and vapors of equivalent
hazard.
Group IIB—Atmospheres containing ethylene, or gases and vapors of equivalent
hazard.
Group IIC—Atmospheres containing acetylene or hydrogen, or gases and vapors of
equivalent hazard.
Zone classification
For the purpose of installation of electrical equipment's, the areas have been
divided into 3 categories of hazardous areas namely- Zone 0 - area where inflammable gas and vapours are expected to be
continuously present eg. inside the tank.
Zone – 1- area where inflammable gas and vapours are expected to be present
under normal operating conditions eg. on the mouth of the vent pipe or near fill
point, unloading point etc., during the operation.
Zone -2 area where inflammable gas and vapours are expected to be present
under abnormal operating condition eg. during the failure or rupture of the
equipment.
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