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
10/21/1974	Use of stilts.	1926.500
09/17/1974	1926.850 demolition work and the use of clamshells.	1926.850, 1926.860
09/04/1974	"Equivalent construction" of cages or wells; cages for 30' straight ladders.	1910.27(d)(1)
07/16/1974	Applicability of 29 CFR 1910.181 to Derricks	1910.181(b)(1)
07/01/1974	Width of Scaffold Platforms.	1910.28, 1926.451
06/20/1974	Stairways for public use are not covered by OSHA.	1910.23(d)
06/12/1974	Welding, burning, riveting, or any open flame operation	1926.451(a)(18)
03/20/1974	Lessor and lessee responsibities for posting floor load limits.	1910.22(d)
01/21/1974	Roll-over Protective Systems (ROPS) on trenchers and snow vehicles.	1926.1003
12/26/1973	Certification of resistance welding equipment inspections.	1910.255(e)
12/23/1973	1926.500, Guardrails, handrails & guards.	1926.500
10/19/1973	Production and installation of sod are agricultural operations.	1910.267
09/18/1973	Employees working at the perimeter of the open sides of formwork decking shall be protected by a standard railing or the equivalent.	1926.500(d)
08/08/1973	Applicability of section 1910.106 to wineries.	1910.106(i)
04/17/1973	Use of an aerial basket to lift employees to an elevation to climb to a higher elevation.	1926.453(b)(2)(iv), 1926.453(b)(2)(x)
02/27/1973	Clarification on locks and exit signs for emergency exits.	1910.36(b)(4), 1910.37(q)(6)
02/23/1973	Tank erection ladders are classified as being a portable metal ladder.	1926.451
09/14/1972	Color of exit signs.	1910.37, 1910.37(b)(6)
05/15/1972	Marking and width requirements for aisles in industrial operations.	1910.22(b)
03/17/1972	Application of 1910.106 to packaged alcoholic beverages.	1910.106(d)

Letters of Interpretation

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