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.

NOTICE:

How to Request a Letter of Interpretation

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Date Title Standard Number
The proper recording of injury and illness cases on the OSHA Log and Summary of Occupational Injuries and Illnesses. 1904 - Table of Contents
What type of powered industrial truck can be used in an aluminum powder production building where dust levels may be in an explosive concentration. 1910.178
The proper recording of a case of the OSHA Log and Summary Occupational Injuries and Illnesses. 1904 - Table of Contents
Complaint Processing Procedures for Dental Offices.
Compliance with medical surveillance requirements for lead exposure during hazardous waste site operations. 1926.62
Lockout/Tagout Citations Against the USDA. 1910.147
The proper recording procedure for cases involving occupational hearing loss. 1904 - Table of Contents
The proper recording of a case for OSHA injury and illness recordkeeping purposes. 1904 - Table of Contents
Variance request. 1910.107, 1910.107(h), 1910.107(h)(2), 1910.107(h)(6), 1910.107(h)(8), 1910.399
OSHA Injury and Illness Recordkeeping Requirements. 1904 - Table of Contents
Request for interpretation of Hazard Communication Standard (HCS). 1910.1200
Clarification on the time allowed for completion of the initial process hazard analysis (PHA) as it may apply to a hypothetical case involving four different work sites of an employer. 1910.119
PRCS interpretation concerning a hydropower dam's 22 foot diameter sluice tunnel. 1910.146
Requesting clarification of Slings 1910.184
(OSHA) tuberculosis (TB) requirements.
Review of Variance Request Number 2276 1910.1002, 1905.11
Handrail and railing clearance for runways (hangar catwalks). 1910.23(e)(6)
The size of fire extinguisher for contruction equipment. 1910.157
The size of fire extinguisher for construction equipment. 1910.157, 1926.150, 1926 Subpart F
Request for a permanent variance and interim order. 1905.11, 1910.261