Letters of Interpretation | Occupational Safety and Health Administration

Letters of Interpretation

OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed.

Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.

These letters of interpretation and the standards they address may not apply to OSHA State Plans. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or additional requirements. Please see OSHA-approved State Plans for more information.

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How to Request a Letter of Interpretation

Date	Title	Standard Number
09/09/1993	Applicablility of the lockout/tagout standards.	1910.333, 1910.147, 1910.269
09/09/1993	Processes involving flammable liquids and gases.	1910.119
09/09/1993	Christmas Treeing.
09/09/1993	Movement of compressed gas cylinders with regulators installed and "special truck" requirement	1910.253
09/09/1993	HHCs as it applies to Hydrogen Peroxide delivered from a tank truck.	1910.119
09/09/1993	Interpretation of the word "close".	1910.110(b)(14)(i)
09/08/1993	Delivery of hydrogen peroxide, 52% by weight or greater.	1910.119
09/08/1993	Safety standards for aerial work platforms.
09/07/1993	Requirement for additional employee training whenever new hazards are identified.	1910.1200
09/03/1993	Wiring, Extension Cords and Grounding.	1926.404(f)(3)(i)
09/03/1993	Secondary wire rope suspension systems.	1926.451(g)(3)(iv)
09/03/1993	Solvents classified as a combustible liquid on the basis of the MSDS	1910.1200(d), 1910.1200(g)
09/02/1993	Definitions for "near proximity" and "serious injury".	1910.151(b)
09/02/1993	Lifting of two empty containers that are vertically coupled by twist locks.	1918.85, 1917.71
08/31/1993	Procedure for maintaining and retaining the OSHA Log.	1904 - Table of Contents
08/31/1993	Proper recording on the OSHA Log of Occupational Injuries and Illnesses.	1904 - Table of Contents
08/31/1993	Employee exposure to hazardous chemicals while working around small sensors.	1910.1200
08/31/1993	Use of insert earphones for audiometric testing.	1910.95(h)(2)
08/27/1993	Enforcement of ventilation requirements for welding operations.	1910.252(c)
08/25/1993	Unit dose syringes.	1910.1030