Electrical Apparatus for Explosive Gas Atmospheres – Part 18: Encapsulation 'm'
standard by Underwriters Laboratories, 12/14/2015
Explosive atmospheres – Part 0: Equipment – General requirements
standard by Underwriters Laboratories, 03/26/2019
Hand-Held Motor-Operated Electric Tools – Safety – Part 2-9: Particular Requirements for Tappers
standard by Underwriters Laboratories, 03/26/2004