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
Lead in construction. 1926.62
Process Safety Management (PSM) of Highly Hazardous Chemicals. 1910.119
Process safety management at what point a work site change would no longer be considered a modification but a new facility. 1910.119
Permit-required confined spaces and control of hazardous energy; vehicle LOTO. 1910.146, 1910.147(a), 1910.147(c)(4)(i), 1910.252
Labeling of Latex 1910.1200
Process Safety Management (PSM) at work sites. 1910.119
The Recordability of a particular injury case. 1904 - Table of Contents
The proper recording of several cases involving restricted work activity. 1904 - Table of Contents
The use of "pipe cases" manufactured by Therm-Equip, Inc., in lieu of standard glove bags. 1926.1101, 1926.1101(g)(2)(ii), 1926.1101(g)(5)(ii)(B)(4)
Interpretation of the process safety management of highly hazardous chemicals standard. 1910.119
The protection of employees working with automotive brakes. 1910.1001
Company negotiated cited conditions.
Applicability of the PSM standard to storage and transfer of flammable liquids. 1910.119(a)(1)(ii)(B)
OSHA's Standard Process Safety Management of Highly Hazardous Chemicals. 1910.119
Interpretation of the electric power generation, transmission, and distribution standard. 1910.132, 1910.269
Installation and Placement of temporary protective grounds 1910.269
Clarification of the requirements of the Respiratory Protection Standard. 1910.134
Negative exposure assessment for 1926.1101. 1926.1101
Letter of compliance regarding "HAZCOM" data sheets. 1926.59
Welding, cutting, and heating near flammables. 1926.352(c)