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
01/09/1979	Prohibition of lean-to scaffolds.	1926.451(a), 1926.451(a)(10)
01/09/1979	Steel Banding as Guardrails.	1926.500
12/13/1978	Hoisting of workmen by load lines of cranes.	1926.550
12/13/1978	Initial monitoring and labelling for inorganic arsenic is not required when exposure could not be above the action level.	1910.1018, 1910.1018(b)
12/05/1978	The inorganic arsenic standard applies to the manufacture of antimony oxide by the fuming process.	1910.1018
12/04/1978	Information on fixed ladders and cages.	1910.27
11/27/1978	Exit Routes.	1910.36, 1910.36(g)(2), 1910.37, 1910.37(a)(3)
11/17/1978	Clarification of 29 CFR 1910.24(b).	1910.24
11/16/1978	The blade guard on the Biro All Purpose Cutter.	1910.212
11/06/1978	Official interpretation of 29 CFR 1926.450(a)(3).	1926.450(a)(3)
11/02/1978	Clarificiation of two General Industry Safety and Health Standards.	1910.212, 1910.213
10/30/1978	Transportation of explosives over public or private roads.	1926.904
10/23/1978	Defective Doors on Railroad Boxcars Hazard Alert.
10/20/1978	Clarification of 29 CFR 1910.104.	1910.104
10/17/1978	Grounding and barricading requirements for lifting equipment used near energized lines.	1926.955(a)(6)(ii), 1926.952(c)
10/10/1978	Distinction between construction employers and employers with fixed establishments.
10/06/1978	Applicability of the inorganic arsenic standard to operations involving chromated copper arsenate (CCA) wood preservative.	1910.1018
10/05/1978	Tie off of iron workers while performing connector operations is not always required.	1926.28, 1926.105, 1926.750
10/02/1978	The use of fiberglass tanks for storage of crude oil.	1910.106
09/25/1978	Brazed joints in an oxygen piping installation.	1910.104

Letters of Interpretation

Filters