Revision to UL 844, Standard for Luminaires for Use in Hazardous (Classified) Locations

UL has released a new edition of UL 844, the standard for Luminaires for Use in Hazardous (Classified) Locations. This revision to ANSI/UL 844 is being issued to add a new paragraph, 37.5. On the UL website, you can either purchase the entire 13th edition or just the revised pages.

Description*

1.1 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.

1.2 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.

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1.3 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.

*Description from the UL standards sales site.