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

Filters


Date Title Standard Number
Interpretation of what constitutes a salt of 4,4' Methylenedianiline (MDA) 1910.1050(b), 1926.60(b)
Replacing electrical cords 1926.404(b)(1)(iii)(C)
Round rungs on ladders 1910.27(b)(1)
Centralized Monitoring for Permit-Required Confined Spaces 1910.146(c)(5), 1910.146(d), 1910.146(i)
Acute Toxicity classification under hazard communication 1910.1200, 1910.1200(f)(1)(v)
Lifting requirements for hospital nurse
Applicability of Certain OSHA Standards to Cabin Crew Members on Aircraft in Operation 1910.95, 1910.1030, 1910.1200
Temporary Enforcement Policy for Proximity Alarm and Insulating Link Use with Cranes and Derricks in Construction 1926.1401, 1926.1407, 1926.1408, 1926.1409, 1926.1410
Regarding the determination of whether an employee may be considered a "qualified rigger" 1926.1401
Clarification regarding impalement hazards on construction worksites 1926.701(b), 1926.25(a)
Sanitation-Toilet Facility 1910.141(c)(1)(i)
Whether qualified rigger required when lifting a load below 2000 lbs or less 1926.1401, 1926.1404, 1926.1425, 1926.1441
OSHA's Amended Hazard Communication Standard (HCS 2012) about Hazards Not Otherwise Classified 1910.1200
Application of OSHA's Amended Hazard Communication Standard (HCS 2012) to Combustible Dust (1910.1200)] 1910.1200
OSHA's Amended Hazard Communication Standard (HCS 2012) regarding Petroleum Streams 1910.1200
OSHA's Amended Hazard Communication Standard (HCS 2012) about classification criteria for Single Target Organ Toxicity 1910.1200
Clarification of Multiple Business Establishments and Covered Employees 1904 - Table of Contents, 1904.30
Clarification of a pre-existing injury or illness and recordable events 1904 - Table of Contents, 1904.5, 1904.7
Field extraction procedure for isocyanate air samples 1910.1000
Specifying decontamination disinfectants and procedures 1910.1030(d)(2)