What are explosion proof motors?
Under certain operating conditions, i.e. pumping a hazardous liquid or operating a pump in a hazardous environment, there exists the potential of a spark or heat to ignite the fluid / vapors. Therefore it is critical to safety that you bond and ground all pumps and containers in such a application to dissipate any static electricity and that you use a approved EXP motor, fittings and wiring procedure. The EXP motors themselves simply put are designed to contain any explosion within them and dissipate the flame before it exists the motor enclosure. They are also designed to operate with in a very defined surface temperature rating. For complete and current details check with your safety officer, Under Writers Laboratories, or the NFPA / NEC codes. Only a device carrying the UL EXP rating should be used. A typical totally enclosed motor (designated TENV, TE or TEFC) do NOT meet EXP classifications.
UL and CSA Hazardous Locations (EXP) – sample listing.
Class I Group D (C I Gp D) locations are atmospheres containing elements such as Gasoline, Hexane, Naphtha, Benzene, Butane, Propane, Alcohol, Acetone, Benzol, Lacquer Solvent Vapors or Natural Gas.
Class I Group C (C I Gp C) locations are atmospheres containing elements such as Ethyl-ether, Ethylene and Cyclopropane.
Class II Group F & G (C II Gp F/G) locations are atmospheres containing dust such as (F) Carbon Black, Coal or Coke Dust, (G) Flour, Starch or Grain Dusts.
Motors misapplied in hazardous environments can cause a fire or explosion resulting in destruction of property, serious injury or death. Only the end user or a qualified underwriter is to identify and select the proper class, group, division, and temperature code motor to meet the requirements of each installation. PumpBiz, Inc. personnel and or the pumpbiz.com web site can advise what listing the motors used with the pumps carry, but cannot evaluate nor recommend what motors may be suitable for use in hazardous environments.
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