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.

Filters


Date Title Standard Number
Periodic serologic testing to monitor antibody concentrations after completion of the hepatitis B vaccine three-dose series is not recommended. 1910.1030, 1910.1030(f)(1)(i)
Chocking requirements for trailers docked to buildings with downward approaches. 1910.178, 1910.178(k)(1), 1910.178(m)(7)
The requirements for vehicle-mounted elevating and rotating aerial devices; effect of revised ANSI A92.2 standards. 1926.453, 1926.453(a)(1)
Whether 29 CFR 1926.601 prohibits an employer from leaving light duty pick-up trucks running and unattended on an off-highway jobsite. 1926.600(a)(3)(ii), 1926.601
Slip resistance of skeletal structural steel. 1926.754, 1926.754(c)(3)
Definition of "extreme low position" for overhead and gantry cranes. 1910.179, 1910.179(h)(2)(iii)(a)
CPR training is a required element in some OSHA general industry standards. 1910.151(b), 1910.146, 1910.266, 1910.269
Acceptability of using a light switch as a disconnecting means for the electrical lockout/tagout standard. 1910.303(b)(2), 1910.333(a)(2), 1910.333(b)(1), 1910.333(b)(2), 1910.399
The definition of "Readily accessible" does not necessarily preclude the locking of electrical panels, provided those needing ready access are provided a key or lock combination. 1910.399
Training programs for the Control of Hazardous Energy (LOTO) and for the Hazard Communication standard are not satisfied solely by merely providing employees written documentation. 1910.147, 1910.147(c)(7)(i), 1910.1200, 1910.1200(h)
Employee's rights upon termination to access to physician's written opinion and respirator fit test results. 1926.1101(m)(4), 1910.134(m), 1910.134(m)(2), 1910.134(m)(4)
Request for formal review of Exelon Generating Corporation's energy control procedure. 1910.269, 1910.269(d)(8)(ii), 1910.269(d)(8)(ii)(D)
Determining voltage ratings for electrical insulating equipment used during electrical power distribution and transmission work. 1910.137(b)(2)(i), 1910.269(a)(3), 1910.269(c), 1910.269(l)(1), 1910.269(l)(2), 1910.269(l)(3), 1910.269(l)(4), 1926.951
Whether ladders must be provided for access/egress for employees climbing columns to make initial connections; whether the initial connection referenced in Question #42 of Directive Number CPL 02-01-034 must be by two wrench-tight bolts? 1926.756, 1926.756(a)(1), 1926.1050, 1926.1050(b), 1926.1051, 1926.1051(a)
Conditions under which a stair railing can also serve as a handrail. 1910.23(e)(1), 1910.23(e)(2), 1910.23(e)(5)(ii)
Chocking of trailers at United States Postal Service facilities. 1910.178, 1910.178(k)(1), 1910.178(m)(7)
Safety precautions, PPE, and immunizations for workers in waste water treatment facility. 1910.1030
Revising baseline audiogram when there is a standard threshold shift in only one ear. 1910.95(g)(9)(i), 1910.95(g)(10)
Employer obligation to provide access to entire OSHA 300 Logs, including names of both union and non-union employees. 1904 - Table of Contents, 1904.29, 1904.35
Acceptability of DOT labeling requirements in lieu of OSHA's labeling requirements for shipments of biohazardous materials. 1910.1030(g)(1)(i)