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Those areas in which flammable gases or vapors are or may be present in the
air in sufficient quantities to produce explosive or ignitable mixtures.
Those areas made hazardous by the presence of combustible dust.
Those areas that are hazardous because of the presence of easily ignitable fibers or flyings, but in which such fibers or flyers are not likely to be in suspension in the air in quantities sufficient to procure ignitable mixtures.
Division One in the normal situation, the hazard would be expected to
be present in everyday production operations or during frequent repair
and maintenance activity.
Division Two in the abnormal situation, material is expected to be confined within closed containers or closed systems and will be
present only through accidental rupture, breakage, or unusual faulty operation.
The gases of vapors of Class I locations are
broken into four groups by the code. A, B, C, and D. Theses materials
are grouped according to the ignition temperature of the substance, its
explosion pressure and other flammable characteristics.
These groups are classified according to the ignition temperature and the conductivity of the hazardous substance.
Special fittings that are required either to prevent
the passage of hot gasses in the case of an explosion in a Class I area
of the passage of combustible dust, fibers, or flyings in a Class II or
Explains in detail the requirements for the installation
of wiring of electrical equipment in hazardous locations. These articles
along with other applicable regulations, local governing inspection authorities,
insurance representatives, and qualified engineering/technical assistance
should be your guides to the installation of wiring or electrical equipment
in any hazardous or potentially hazardous location.
NOTE: fibers and flyings are not likely to be suspended in the air, but can collect around machinery or on lighting fixtures and where heat, a spark, or hot metal can ignite them.
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