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
Personnel hoists. 1926.552
The use of compressed air for cleaning purposes with a pressure greater than 30 P.S.I. and the use of air guns with long pipes 1910.242
Interpretation regarding the use of plywood decked Aluma-Planks. 1926.500(b)(8)
Clarification of 1910.23(c)(1). 1910.23
The requirement for fire resistant fluids does not apply to hydraulic tools. 1926.302, 1926.950
Recent grain elevator explosions in Galveston and New Orleans. 1910.272
Grain elevator explosions. 1910.272
Recent grain elevator explosions. 1910.212
Walers used as access ladders. 1926.700
Requirements for toeboards. 1926.451, 1926.500
The recent grain elevator explosions. 1910.272
Transparent Welding Curtains and the Requirements. 1910.252
Enforcement of 29 CFR 1926.601(b)(10). 1926.601(b)(10)
Grain elevator explosions. 1910.272
Fire and explosions in grain elevators. 1910.272
Grain elevator explosions. 1910.272
Grain dust explosions. 1910.272
Grain elevator explosions can be prevented by the elimination of the present dust producing equipment. 1910.272
The explosions that have been occuring in the grain elevators. 1910.272
Compression spring requirements for mechanical power presses.;Compression spring requirements for mechanical power presses. 1910.217(b)(3)(ii), 1910.217(b)(4)(iii)