UL 781 BULLETIN-2011
UL Standard for Safety Portable Electric Lighting Units for Use in Hazardous (Classified) Locations

Standard No.

UL 781 BULLETIN-2011

Release Date

2011

Published By

Underwriters Laboratories (UL)

Latest

UL 781 BULLETIN-2011

Scope

These requirements cover portable electric lighting units for indoor use in hazardous (classified) locations@ Class I@ Division 1@ Groups C and D@ and Class II@ Division 1@ Groups F and G@ in accordance with the National Electrical Code@ NFPA 70. These requirements also cover explosion-proof electrical equipment for use in Class I@ Zone 1@ Groups IIA@ IIB@ and IIC hazardous (classified) locations. These requirements cover portable lighting units for use only under the following atmospheric conditions: a) A minimum ambient temperature of minus 25??(minus 13??; b) An oxygen concentration not greater than 21 percent by volume; and c) A nominal barometric pressure of one atmosphere.

UL 781 BULLETIN-2011 history

• 2011 UL 781 BULLETIN-2011 UL Standard for Safety Portable Electric Lighting Units for Use in Hazardous (Classified) Locations
• 2008 UL 781 BULLETIN-2008 UL Standard for Safety Portable Electric Lighting Units for Use in Hazardous (Classified) Locations
• 2003 UL 781 BULLETINS-2003 (Draft)2/27/2003 (32p)
• 2003 UL 781 BULLETIN-2003 UL Standard for Safety Portable Electric Lighting Units for Use in Hazardous (Classified) Locations
• 2003 UL 781-2003 UL Standard for Safety Portable Electric Lighting Units for Use in Hazardous (Classified) Locations (Seventh Edition)
• 1993 UL 781-1993 UL Standard for Safety Portable Electric Lighting Units for Use in Hazardous (Classified) Locations (Sixth Edition; Reprint with Revisions Through and Including March 15@ 1999)