UL 120101

Standard for Definitions and Information Pertaining to Electrical Equipment in Hazardous Locations
standard by Underwriters Laboratories, 12/03/2019

UL 122001

General Requirements for Electrical Ignition Systems for Internal Combustion Engines in Class 1, Division 2 or Zone 2, Hazardous (Classified) Locations
standard by Underwriters Laboratories, 08/29/2014