UL - 844
UL Standard for Safety for Luminaires for Use in Hazardous (Classified) Locations
|Publication Date:||11 January 2006|
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 explosion-proof luminaires for installation and use in Class I, Zone 1, Groups IIA, IIB, IIB plus Hydrogen, and IIC hazardous (classified) locations.
These requirements cover luminaires for use only under the following atmospheric conditions:
a) A minimum ambient temperature of minus 25°C (minus 13°F),
b) An oxygen concentration not greater than 21 percent by volume, and
c) A nominal barometric pressure of one atmosphere.