UL Standard for Safety Luminaires for Use in Hazardous (Classified) Locations (Twelfth Edition; Reprint with Revisions Through and Including November 20@ 2008)
These requirements cover fixed and portable luminaires for installation and use in hazardous (classified) locations@ Class I@ Divisions 1 and 2@ Groups A@ B@ C@ and D; Class II@ Division 1@ Groups E@ F@ and G; Class II@ Division 2@ Groups F and G; and Class III@ Divisions 1 and 2@ in accordance with the National Electrical Code@ NFPA 70. These requirements also cover luminaires for installation and use in Class I@ Zones 1 and 2@ Groups IIA@ IIB@ IIB plus Hydrogen@ and IIC@ and Zone 20@ 21 and 22 hazardous (classified) locations in accordance with the National Electrical Code@ NFPA 70. These requirements cover luminaires for use only under the following atmospheric conditions: A minimum ambient temperature of minus 25??(minus 13??@ An oxygen concentration not greater than 21 percent by volume@ and A nominal barometric pressure of one atmosphere.