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.

Date	Title	Standard Number
11/19/1985	Application of the Hazard Communication standard to gray and ductile iron castings.	1910.134
11/15/1985	Use of Bureau of Mines Approved Gas Mask Canisters	1910.134
11/15/1985	Use of Chemical Cartridge Respirators for Protection Against Mercury Vapor	1910.134(d)(3)(iii)(B)(1)
11/15/1985	Use or Bureau or Mines Approved Gas Mask Canisters.
11/14/1985	Standard railing requirements.	1926.500
11/13/1985	"Rustgo Work Platform".	1926.451, 1926.452(w)
11/08/1985	Hazardous components of diesel engine emissions.	1910.1000, 1910.1000 TABLE Z-1
11/08/1985	Interpretation on the application of 1910.1020 to material safety data sheets.	1910.1020
11/08/1985	Marking recognition, regulations and policy of double insulated power tools	1926.302(a), 1926.404(b)(1)(i)
10/28/1985	Procedures for ethylene oxide (EtO) spills and ethylene oxide disposal	1910.1047
10/28/1985	Applicability of Ground-fault Protection Standards When Extension Cords are Plugged into Permanent Wiring at Construction Sites.	1926.400
10/21/1985	The Willson SPECTRA eye protective device complies with ANSI Z87.1- 1968.	1910.133(b)(2)
10/18/1985	OSHA does not "list" or accredit testing laboratories under 29 CFR Part 1907.	1907 - Table of Contents
10/10/1985	Noise standards applicable to Metra are under the jurisdiction of the Federal Railroad Administration.	1975.1, 1910.95
10/09/1985	Air compressor systems must be tested for air purity on six month intervals.	1910.430(b)(4)
10/04/1985	Generic MSDSs to cover different products that contain the same chemicals in different proportions.	1910.1200
10/03/1985	Requirements for scaffold plank.	1926.451
09/30/1985	Interpretation of 29 CFR 1926.950(a).	1926.950
09/30/1985	Fall protection for employees engaged in erecting or dismantling scaffolds.	1926.28
09/26/1985	Temporary lighting at construction sites.	1926.401(j)(2)

Letters of Interpretation

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