8/13/2019 Explosion Proof Classifications
1/2
11.12.13 Explosion Proof Classifications
www.cordellmfg.com/tech_explos.htm
OSHA Regulations
HMI Hoist Duty ClassificationsNEMA Standards
Beam Dimensions
Explosion Proof Classifications
Full Load Amp Chart/Temp
Ratings
CMAA Crane Duty
Classifications
IEC Enclosure Ratings
Explosion classified areas are defined by the following classes,
divisions
and groups, by the National Electric Code (NEC) (*See caution
below).Many hoist manufacturers can furnish equipment to comply
with the
various classifications. A distinction needs to be recognized
between
equipment designed to comply with these provisions of the NEC
and
equipment that is designed to be spark resistant. The provisions
of the
NEC are related primarily to the use of proper enclosures and
wiring
trolleys, bronze hooks, stainless steel chain or wire rope to
accomplish
the necessary spark resistance. When specifying equipment for
these
areas please determine if you need spark resistant features in
addition
to the NEC requirements for the electrical enclosures and
wiring. Spark
resistant features when applied to hoist equipment normally
decrease
the capacity and increase the cost.
Explosion Proof Classifications
Class Definitions
Class I
Locations: Are those in which flammable gases or
vapors are or may be present in the air in quantities
sufficient to produce explosive or ignitable mixtures.
Class IILocations: Are those which are hazardous due to
the presence of combustible dust.
Class III
Locations: Are those which are hazardous due to
the presence of easily ignitable fibers or flyings, but
in which such fibers or flyings are not likely to be in
suspension in the air in quantities to produce
ignitable mixtures.
Division
Division I
Locations in which hazardous concentrations in the
air exist continuously, intermittently, or periodicallyunder
normal operating conditions.
Division II
Locations in which hazardous concentrations are
handled, processed, or used but are normally within
closed containers or closed systems from which
they can escape only in case of accidental rupture
or breakdown.
Group (Class I)
http://www.cordellmfg.com/tech_iec.htmhttp://www.cordellmfg.com/tech_cmaa.htmhttp://www.cordellmfg.com/tech_cmaa.htmhttp://www.cordellmfg.com/tech_fulload.htmhttp://www.cordellmfg.com/tech_fulload.htmhttp://www.cordellmfg.com/tech_explos.htmhttp://www.cordellmfg.com/tech_beam.htmhttp://www.cordellmfg.com/tech_nema.htmhttp://www.cordellmfg.com/tech_hmi.htmhttp://www.cordellmfg.com/tech_osha.htm
8/13/2019 Explosion Proof Classifications
2/2
11.12.13 Explosion Proof Classifications
www.cordellmfg.com/tech_explos.htm
Group A Atmospheres containing acetylene.
Group B
Atmospheres containing hydrogen, or gases (or
vapors) of equivalent hazard, such as manufactured
gas.
Group C
Atmospheres containing ethyl-ether vapors,
ethylene or cyclo propane.
Group D
Atmospheres containing gasoline, hexane, naptha,
benzine, butane, alcohol, acetone, benzol, lacquer
solvent vapors, or natural gas.
Group (Class II)
Group E
Atmospheres containing metal dust, including
aluminum, magnesium and their commercial alloys
and other metals of similarly hazardouscharacteristics.
Group FAtmospheres containing carbon black, coal, or coke
dust.
Group G Atmospheres containing flour, starch, or grain dust.
*Caution: Please consult the National Electric Code for the
exact
requirements.
The above breakdown is a summary and should not be relied upon
for
accuracy or completeness.[Home] [About Us] [Services] [Technical
Center] [Online Store]
[Contact Us] [Site Map] [Privacy Policy]
http://www.cordellmfg.com/ppolicy.htmhttp://www.cordellmfg.com/sitemap.htmhttp://www.cordellmfg.com/contact.htmhttp://www.cordellmfg.com/ordering.htmhttp://www.cordellmfg.com/techcenter.htmhttp://www.cordellmfg.com/services.htmhttp://www.cordellmfg.com/about.htmhttp://www.cordellmfg.com/index.htm
