UL Standard for Safety Electrical Equipment for Use in Class I and II, Division 2, and Class III Hazardous (Classified) Locations Third Edition;Reprinted With Revisions Through and Including 2/3/2004
1.1 These requirements apply to equipment, circuits, or components intended for use in Class I, Groups A, B, C, and D, Division 2, hazardous (classified) locations; Class II, Group...