Class 1 Division 1 lighting are used at locations where a fire or explosion hazard may exist due to flammable liquids or gases being used or stored there. The construction of these fixtures is governed by the standard UL 844 and the National Electric Code (NEC) article 501 to provide confidence in the safe operation of lighting fixtures in these hazardous classified environments.

The National Electrical Code (NEC) along with the National Fire Protection Association (NFPA) and Underwriters Laboratories (UL) have published a guide along with codes that classify hazardous areas into classes, divisions and zones.

Class 1 Hazardous Locations refer to facilities which `deal with flammable gases, vapors, and liquids.

Division 2 specifies that these flammable materials are handled, processed, or used in the defined hazardous location, but are not normally present in concentrations high enough to be ignitable. Simply put, this requires proper handling and storage of the flammable gases, vapors, or liquids to prevent such an ignition under normal operating conditions. This also might involve a positive mechanical ventilation system that prevents any ignitable concentration from forming, and absent any breakdown of the ventilation equipment, the concentration of the flammable gases or liquid-produced vapors will never reach an ignitable level.


Division 2 has 4 groups within it containing different levels of flammability and combustibility of the gases, liquids, or vapors.


Group A contains only acetylene.

Group B includes hydrogen, gases with more than 30% hydrogen by volume, butadiene, ethylene oxide and propylene oxide.

Group C includes acetaldehyde, cyclopropane, diethyl ether, and dimethyl hydrazine.

Group D includes gasoline, acetone, ammonia, benzene, butane, methane, propane, alcohols and other more commonly encountered compounds.



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To learn more about Class 1 Division 2 Lighting or any other Intrinsically Safe, Explosion Proof or Hazardous Area products, please contact our experts or call us on 832-699-6726


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