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
End dump trucks on jobsites or public highways 1926.601, 1926.601(b)(11)
Classification and subsequent designs may be used if they have been approved by a registered professional engineer. 1926.650, 1926.652
Manufacturer's Tabulated Data in the design and application of trench safety systems. 1926.650
Failures with anti-two blocking devices 1926.550(g)(3)(ii)(C)
Labeling Requirements for Crystalline Silica Products. 1910.1200
Enforcement jurisdiction at IMC Fertilizer, Inc. 1975.1
Informal Conference Guidance.
Worker Exposures to Volatile Amines 1910.1200
Operations level personnel training. 1910.120
Request for variance from standard on Cranes and Derricks 1926.550(a)(9), 1905.11
Field Service Memo on Electrical Testing Equipment
Recording Cumulative Trauma Disorders on the OSHA 200 Log. 1904 - Table of Contents
Appropriate recordkeeping for CTD case resolution and symptom recurrence. 1904 - Table of Contents
Machine guarding for the food processing industry. 1910.212, 1910.219
Electrical interface units used to connect nurse call systems with pocket page transmitters and other ancillary equipment. 1910.303
Ability to reconcile the Occupational Safety and Health Administration's meatpacking guidelines. 1975.1
Recording hearing loss on the OSHA 200 Log
Fall protection as it relates to electric power transmission line construction and maintenance. 1926.951
Requirement to develop MSDSs for pharmaceutical products and controlled substances 1910.1200
The storage of flammable and/or combustible materials in fiberglass reinforced plastic. 1910.106