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
The CAM/PCAM Model C instrument is considered equal to the vertical elutriator cotton dust sampler. 1910.1043(d)(1)(iv)
Applicable regulations to the Nupro 316-DC-RD cylinder valve 1910.101
Iodine exposure during pre-operative scrubbing.
The acceptability of manhole entries through concentric cone or eccentric cone concrete pipe transition sections to underground workplaces. 1910 - Table of Contents, 1910.23(a)(6), 1910.23(c)(1), 1910.27, 1910.132(a), 1910.268
Inquiry concerning regulations that apply to smoking in dormitories. 1975.3, 1910.1000 TABLE Z-1
Criteria for severe solvent refinement under the Hazard Communication Standard. 1910.1200
Applicability of the Hazard Communication standard to pesticides. 1910.1200(f)(5)(i), 1910.1200(f)(5)(ii), 1910.1200(f)(6)
Labeling requirements for containers of polyvinyl chloride. 1910.1017(l)(4), 1910.1017(b)(6), 1910.1200
Couplings used in supplied air respirator systems. 1910.134(i)(8)
The M-17 gas mask may not be used by workers other than enlisted military personnel. 1910.134
Power Press Brakes. 1910.212, 1910.212(a)(3)(ii)
Spacing of guardrail brackets used on flying forms. 1926.704
The cotton dust standard applies to the elastic fabric industry 1910.1043
The use of disposable respirators where cotton dust concentration is no greater than five times the PEL. 1910.1043
Potentially Hazardous Amine Absorber Pressure Vessels Used in Refinery Processing 1910.101
General review of the OSHA noise standard. 1910.95
Employee exposure to cotton dust. 1910.1043
Clarification of our standard railing requirements. 1926.500
Requirements of the Hazard Communication Standard as it applies to the metal chips and other scrap material. 1910.1200
Labeling and MSDS requirements for product containing trace quantities of ethylene oxide.; Criterion that must be satisfied in order to assert that a product or operation is exempt for the EtO Standar 1910.1200, 1910.1047(a)(2)