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
Clarification of Material Safety Data Sheet Requirements Under the Hazard Communication Standard. 1910.1200
Safeguarding of Metal Cutting Do-All Saw at the Norfolk Naval Shipyard. 1910.212
Additional requirements for distributors from the August 24, 1987 expansion of the HCS. 1910.1200
Appeal's court rules that modular housing assembly will be regulated as manufacturing. 1926 - Table of Contents
Retention requirements for superseded MSDSs. 1910.1200(g)
Lift Slab Construction. 1926.700
Temporary lighting branch circuits. 1926.405, 1926.449
Clarification of revised Subpart K, Electrical Standard for Construction, 1926.403(a). 1926.403(a)
Cranes used to hoist and suspend employees on a work platform.
Definition, application and use of "Horns". 1926.602
Definitions of target organ and hazards of chemicals under the Hazard Communication Standard. 1910.1200
Application of the Hazard Communication Standard to art materials industry. 1910.1200
Respiratory protection compliance responsibility for contract workers and visitors. 1910.134
National Paint and Coatings Association's (NPCA) Health Effects Labeling Approach 1910.1200
Responsibility for Material Safety Data Sheets (MSDS) Under the Hazard Communication Standard (HCS) 1910.1200
Clarification of the requirement for representative monitoring under the asbestos standard for construction. 1926.1101(f)
Interim enforcement procedures for AIDS, Hepatitis B, and other blood-borne infectious diseases. 1910.132, 1910.22(a)(1), 1910.141(a)(4)(ii), 1910.145
Requirements of 1910.177, Restraining Devices and Barriers. 1910.177
Presence of chromium in monocomponent photocopier toner is under investigation. 1910.1200
Horns and audible alarms. 1926.602(a)(9)(i)