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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Date Title Standard Number
Evaluation of plan to retrofit fork lift equipment with an operator safety restraint system. 1910.178(a)(4)
Misapplication of Power Lawnmower Standard. 1910.243
Requirements for target organ effects on labels under the Hazard Communication standard. 1910.1200
Sample numbers and measurement duration for compliance to the cotton dust standard for a weaving operation 1910.1043
Information on Polychlorobiphenyls (PCB's) in Ceiling Tiles 1910.1000 TABLE Z-1, 1910.120
1926.451(i)(8) does not allow two or more employees to use a common lifeline. 1926.451(i)(8)
Requirements relative to the use of anhydrous ammonia in Diazo Reproduction machines. 1910.111(b), 1910.111(e)
Testing equipment for use in potentially hazardous environments. 1910.303, 1910.304, 1910.307, 1910.399
Interpretation on availability of emergency information under the Hazard Communication Standard. 1910.1200(g)(2)(xii)
Standards for scaffolds do not prohibit the intermingling of scaffolding components. 1926.451
Clarification of voltage classification for electric distribution and transmission lines. 1926.550
Target organ labeling requirements for shipped containers. 1910.1200(f)(5)(ii)
Field calibration of noise dosimeters. 1910.95
Transfer of Class IA liquids from polyethylene drums. 1910.106(e)(6)(ii), 1910.106(h)(7)(i)(b)
Electric utility industry concerns. 1926.417, 1926.402, 1926.432, 1926 Subpart K
High speed cobalt steel drill bits evaluated as a "article" under the Hazard Communication Standard. 1910.1200
General information related to the Hazard Communication standard. 1910.1200
Handling and Use of Flammable Liquids. 1910.106
Respirator fit testing requirements in the revised asbestos standard. 1910.1001
The storage and handling of flammable and combustible liquids in Clairol's Stamford warehouse. 1910.106, 1910.106(d), 1910.106(d)(5)(i), 1910.106(d)(5)(vi), 1910.106(d)(5)(vi)(b), 1910.37, 1910.37(b)