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
HAZWOPER applications. 1910.120, 1910.120(a), 1910.120(d), 1910.120(e), 1910.120(e)(3)(ii)
Work-related hearing loss. 1904 - Table of Contents
Level of work-related hearing loss that must be recorded on the OSHA 200 log. 1910.95, 1904 - Table of Contents
Proper wiring of a new overhead crane. 1910.303
Emergency situations that fall under Hazwoper. 1910.120
Design and use of trench boxes 1926.652(g)(1)(iv)
Concerning power press brake operations. 1910.212
Definition of "actual field experience" in Hazwoper. 1910.120
OSHA citations issued against Phillips 66 Company. 2200.100
Rollover Protective Structures (ROPS) used on agricultural wheeled tractors. 1928.51
Safety of employees in the workplace where portable generators are used as power sources. 1910.302
Yellow shall be the basic color for designation caution. 1910.144
Load Chart Posting and Visibility Requirements for Mobile Cranes 1910.180, 1926.550
Hearing report on OSHA reform.
Field Sanitation Standard. 1928.110
The terminology "making contact with the interior leg casing" in CPL 02-01-004 and grain handling facilities with less than one million bushels permanent storage capacity 1910.272(p)(4)(ii)
Noise and potential hazard of backup alarms on equipment at construction sites. 1926.601(b)(4), 1926.602(a)(9)
Stacking trench boxes in trenches. 1926.650
Differences between the various standards for Rollover Protective Structures used on agricultural wheeled tractors. 1928.51(b)(1), 1926.1002(a)(5), 1926.1002(j)(1)
The role of self-audits in safety and health programs 1926.20(b)(2)