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.

NOTICE:

How to Request a Letter of Interpretation

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Date Title Standard Number
Reeves Sleeve stretcher.
Rigging equipment for material handling. 1926.251
When steam boilers fired by flammable liquids or natural gas are subject to the PSM standard. 1910.119
Protective devices for ladderway openings. 1910.21
Transportation of hazardous waste. 1910.120, 1910.120(q), 1910.1200, 1975.1
Review of Rope Grab Knot. 1910.66 App C
Fiberglass tanks for above and below ground storage of flammable and combustible liquids 1910.106
Occupational injury and illness data from worker's compensation carriers. 1904 - Table of Contents
Debt collection charges for January 1993 through December 1993.
Flammable liquid processes and the Process Safety Management standard. 1910.119
Employee participation requirements of the Process safety management standard. 1910.119
Steam boilers fired by flammable liquids or natural gas and the PSM standard. 1910.119
Evaluation of a "generic" Material Safety Data Sheet (MSDS) for copper/copper alloys. 1910.1200
Proper recording of hearing loss on the OSHA Log 200. 1904.2(a)
Contract employees and recordkeeping requirements. 1904 - Table of Contents
OSHA's Hazard Communication Standard. 1910.1200
Clarification of training certification. 1910.120
The hazardous waste operations and emergency response regulation. 1910.38, 1910.120
OSHA's Hazard Communication Standard. 1910.1200
Requirements for 'area classification drawings' for petrochemical plants. 1910.307