#	Letters of Interpretation
1	12/16/2013 - 1910.303(a) - Application of 29 CFR 1910 Subpart S to design of industrial machinery
2	04/24/2012 - 1910.303(a) - NRTL requirements for shielding gas regulators.
3	08/10/2005 - 1910.303(a) - Approval requirements for replacement, modification, repair, or rehabilitation of electrical utilization equipment.
4	05/11/2004 - 1910.303(a) - Electrical equipment approved by a NRTL is acceptable to OSHA.
5	07/16/2003 - 1910.303(a) - Workplace use of electrical equipment designated as "Household Use Only" and recordkeeping requirements.
6	05/27/2003 - 1910.303(a) - Electrical conductors and equipment must be approved and used according to its listing/label.
7	05/13/2003 - 1910.303(a) - Acceptability of modifying a standard on/off switch to provide lockout capability to a machine.
8	02/07/2000 - 1910.303(a) - NRTL certification for electrically-operated sewer inspection equipment.
9	09/09/1997 - 1910.303(a) - Clarification of the Electrical Standard as it applies to flexible power cords on appliances.
10	10/15/1990 - 1910.303(a) - Control systems used for emergency evacuation are required to be listed by Underwriter's Laboratories.
11	07/05/1990 - 1910.303(a) - Repair/Rebuilding of UL Listed Equipment for Hazardous Locations.
12	12/29/1989 - 1910.303(a) - Certification of Nurse Call Systems
13	08/19/1982 - 1910.303(a) - OSHA practices in recognizing national testing laboratories.