Electric Motor-Operated Hand-Held Tools, Transportable Tools and Lawn and Garden Machinery – Safety – Part 2-9: Particular Requirements for Hand-Held Tappers and Threaders
standard by Underwriters Laboratories, 02/26/2016
Standard for Programmable Controllers – Part 2: Equipment Requirements and Tests
standard by Underwriters Laboratories, 06/05/2008
Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use – Part 1: General Requirements (Includes Revisions 1 and 2, from 2005 and 2008)
standard by Underwriters Laboratories, 05/11/2012