Safety Certified Lights

Class I locations are made hazardous by the presence of flammable gases, vapors or liquids.Examples of Class I locations are petroleum refineries, utility gas plants, gasoline storage and dispensing areas and dry cleaning plants.

Division I designates an environment where ignitable concentrations of flammable gases, vapors, or liquids can exist all of the time or some of the time under normal operating conditions. Examples of a Division I location are loading zones or areas near relief valves at a petroleum refinery because flammable hazardous materials exist under normal operations.

Division II locations are areas where ignitable concentrations of flammable gases, vapors, or liquids are not likely to exist under normal operating conditions. Examples of a Division II location is a storage room with oil drums. An ignitable concentration of gas vapors would only exist under abnormal operating conditions, if a drum were to be leaking.

Class II locations are described as hazardous because of the presence of combustible dusts. Examples of Class II locations are grain elevators, coal preparation plants, and producers of plastics, medicines, and fireworks, spices, sugar, and cocoa.

Division I locations include areas where combustible dust may be in suspension in the air under normal conditions in sufficient quantities to produce explosive or ignitable mixtures (Dust may be emitted into the air continuously, intermittently or periodically), or where failure or malfunction of equipment might cause a hazardous location to exist and provide an ignition source with the simultaneous failure of electrical equipment, included also are locations in which combustible dust of an electrically conductive nature may be present.

Division II locations are those in which combustible dust will not normally be in suspension nor will normal operations put dust in suspension, but where accumulation of dust may interfere with heat dissipation from electrical equipment or where accumulations near electrical equipment may be ignited.

Class III locations contain easily ignitable fibers and flyings. Examples of Class III locations are textile mills and plants that create sawdust as a byproduct.

Division I locations in which easily ignitable fibers or materials producing combustible flyings are handled, manufactured or used.

Division II locations where easily ignitable fibers are stored or handled.