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.

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Date Title Standard Number
OSH Act applicability to tribal land workplaces and employers. 1975.4(b)(3)
Welder electrical safety training 1910.252, 1910.254, 1910.255
Safety net and supporting stanchion requirements. 1926.502, 1910 Subpart D
Waist/chest strap as part of full body harness. 1926.502(b), 1926.502(d)(16)
Authority for injury/illness recordkeeping requirements;restricted work activity. 1952.4
Recalculating pressure vessel design; codes "no longer in use." 1910.119(d)(3)(iii), 1926.64(d)(3)(iii)
Trailer trucks must be restrained/chocked during forklift dock operations. 1910.178(k)(1), 1910.178(m)(7), 1910.178(l)
OSHA's Logging Operations Standard applies to commercial tree trimming. 1910.266
Logging equipment brake system requirements 1910.266
Rated load markings for overhead bridge and gantry cranes. 1910.179(b)(5)
Maintenance of radiation exposure records NRC licensee contractors. 1910.1096, 1926.53
Procedure to follow when Hepatitis B vaccine schedule is interrupted. 1910.1030
Proof load testing for Shore-based Material Handling Devices and Floating Cranes remains four years. 1918.11(a), 1918.66(a)(1), 1915.115(a)(1)
Gloves for handling telecommunications cable suspension strand. 1910.268
Partial Stay of Methylene Chloride Standard 1910.1052
Restricted work, prescription for pain, and strains: interpretations. 1904 - Table of Contents
Recordability of restriction of work; laceration recordability. 1904 - Table of Contents
Applicability of PSM standard to explosive and pyrotechnic manufacturing. 1910.119, 1910.109(k)(2), 1910.109(k)(3)
Approval and selection of medical devices to minimize employee exposure. 1910.1030
Disabled (hearing impaired) forklift operators. 1910.178(l)(1)(i)