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

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Date Title Standard Number
Paint thinner can be stored in approved plastic one-gallon containers. 1910.106(d)(2)
Point of operation guarding on power press brakes. 1910.212
Interpretation of 1910.107 as it applies to glue spraying operations. 1910.107(m)
Positive determination of work-relatedness of standard threshold shift not required. 1910.95(c)
Clarification relative to scaffold heights under 10 feet. 1926.451
Clarification on physical qualifications for crane operators. 1910.179(b)(2)
Interpretation of "employee exposure record". 1918.94(c), 1910.1020(c)(5)(i), 1910.1020(e)
Interpretation on ladder use with scaffolding. 1926.451(a)(13)
Hinged rest platforms cannot be used for fixed ladders. 1910.27(d)(2)
Directive showing protection techniques on oil and gas well drilling rigs.
Perimeter protection at setback roof levels. 1910.23(e)(3)(v)
Clarification of Fire Protection, Exit Routes, and Hazardous Material Standards. 1910.38, 1910.157, 1910.38(e), 1910.157(g)(1)
Status and applicability of Thiram standards in Washington and Oregon. 1910.1000
Building Anchors Used for Intermittent Stabilization of a Suspended Powered Platform in Window Washing Operations and Light Building Maintenance. 1910.66
Life Safety Code. 1910.39
Tennessee's fire protection standard. 1910.156(a)(2)
Use of pin connected work platforms on your rough terrain cranes. 1926.556
Appropriate Citing for Guardrails used in Concrete Forming. 1926.500(d)(1)
Utilization of a Stop Time Measuring Instrument for Verification of Compliance With 29 CFR 1910.217. 1910.217
The wearing of photo-grey safety lenses. 1910.133