UL 1685
Vertical-Tray Fire-Propagation and Smoke-Release Test for Electrical and Optical-Fiber Cables
standard by Underwriters Laboratories, 02/25/1997
UL 913
Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II and III, Division 1, Hazardous (Classified) Locations
standard by Underwriters Laboratories, 02/21/1997