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 1910.184. 1910.184
Agricultural farm equipment standards. 1928.57
OSHA may not approve, endorse, or recommend any product or process. 1910.107
Interpretation of riding the load or hook. 1926.550
Trenching Requirements related to banks. 1926.652(a)
Exit signs in occupied workplaces be illuminated from a reliable external light source which provides a minimum of 5-foot candles on the sign surface. 1910.37
Emergency venting for portable tanks. 1910.106
Guarding of Farm Field Equipment, Farmstead Equipment, and Cotton Gins. 1928.57
Alloy Steel Chain Slings. 1910.184
Allowable Airborne Concentrations of Mercury 1910.1000
The application of 29 CFR 1910.242(a) to hand-operated paper cutters (trimming boards). 1910.212, 1910.242
Information on radial arm saw guards. 1910.265
Photo grey lens in relation to eye protection standards. 1910.133, 1910.268
Showers and lunch areas. 1910.141
"Extensible Ladders" and the requirement for "upper and lower" controls. 1910.67
The handling, storing, and using of Methylacetylene- Prepadiene, Stabilized (MPS) gas in below ground-level construction work. 1926.350
Clarification of the requirements under the OSHA Standard 1910.166(c)(3)(i)(a) as opposed to the requirement of 1910.166(d)(1). 1910.166
Personnel Protective Equipment - Steel Erection. 1926 - Table of Contents
Airborne mixtures containing less than 1.0 or 0.1 percent of a carcinogen are exempt 1910.1003, 1910.1016
The use of hard hats in a warehouse operation. 1910.132, 1910.135