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.

NOTICE:

How to Request a Letter of Interpretation

Filters


Date Title Standard Number
Applicability of Section 1910.106 to Chemicals Plants. 1910.106
Preparing a Material Safety Data Sheet under the trade secret provisions of the Hazard Communication Standard. 1910.1200
Response to request for variance from 1910.242(b) 1910.242(b)
OSHA standards for foot protection. 1910.136
Inspection procedures for the Hazard Communication Standard. 1910.1200
Facial hair in the face sealing area is unacceptable. 1910.134(g)(1)(i), 1910.134(g)(1)(ii), 1910.134(g)(1)(iii)
Interpretation of application of 1910.1020 to Federal agencies. 1910.1020
Application of the Hazard Communication standard to gray and ductile iron castings. 1910.134
Use or Bureau or Mines Approved Gas Mask Canisters.
Use of Bureau of Mines Approved Gas Mask Canisters 1910.134
Use of Chemical Cartridge Respirators for Protection Against Mercury Vapor 1910.134(d)(3)(iii)(B)(1)
Standard railing requirements. 1926.500
"Rustgo Work Platform". 1926.451, 1926.452(w)
Hazardous components of diesel engine emissions. 1910.1000, 1910.1000 TABLE Z-1
Marking recognition, regulations and policy of double insulated power tools 1926.302(a), 1926.404(b)(1)(i)
Interpretation on the application of 1910.1020 to material safety data sheets. 1910.1020
Applicability of Ground-fault Protection Standards When Extension Cords are Plugged into Permanent Wiring at Construction Sites. 1926.400
Procedures for ethylene oxide (EtO) spills and ethylene oxide disposal 1910.1047
The Willson SPECTRA eye protective device complies with ANSI Z87.1- 1968. 1910.133(b)(2)
OSHA does not "list" or accredit testing laboratories under 29 CFR Part 1907. 1907 - Table of Contents