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.

Filters


Date Title Standard Number
All electrical equipment must be approved. 1910.399
HHCs as it applies to Hydrocarbon fuels used solely for workplace consumption. 1910.119
Exposure monitoring requirements. 1910.1001
Work relationship of an injury occurring on the company premises. 1904 - Table of Contents
Willful violations for lack of general training in construction. 1903 - Table of Contents, 1926.21
Determination of the proper date of injury or illness for OSHA recordkeeping purposes. 1904 - Table of Contents
Recordability of cases involving the use of a hand held massager. 1904 - Table of Contents
Air quality at a construction site.
MSDS requirements for drugs 1910.1200
Standard railing specifications.
Clarification of the definition of a permit-required confined space (permit space). 1910.146
Labeling requirements for Formaldehyde when used as an insecticide 1910.1048
Extension cord grounding continuity requirements. 1926.404(b)(1)(iii)(D), 1926.404(b)(1)(iii)(E), 1926.404(b)(1)(iii)(G)
Warning stickers on stump grinders. 1926.200
Duties of a "construction manager" on a multi-employer worksite.
Compliance and Enforcement Activities affected by the PELs Decision. 1910.1000, 1910.1000 TABLE Z-1, 1910.1000 TABLE Z-2, 1910.1000 TABLE Z-3
Post-emergency response and medical surveillance requirements of HAZWOPER 1910.120
Permit-Required Confined Spaces for General Industry. 1910.146
Recording restricted work activity on the OSHA 200 Log. 1904 - Table of Contents
When orthopedic devices constitute medical treatment for recordkeeping purposes. 1904 - Table of Contents