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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How to Request a Letter of Interpretation

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Date Title Standard Number
Load Testing of Synthetic Web and Other Slings 1910.184
Enforcement of the Hazard Communication Standard 1910.1200
Clarification on the use of respirators while unloading ethylene oxide (EtO) sterilization chambers. 1910.1047
Apex 1000 emulsion is regulated as an ammonium nitrate mixture which is not a blasting agent. 1910.109
Copies of MSDSs and the written hazard communication program must be provided to an employee representative. 1910.1200
Safe distance as it applies to fire protection for battery charging areas. 1910.178
Qualifications for instructors under the training requirements of OSHA's Hazardous Waste and Emergency Response interim final rule. 1910.120
National Electrical Manufacturers Association (NEMA) Warning Alert Regarding Imported Circuit Breaker Panels 1910.303
Training requirements under 1910.120 for employees providing services which do not disturb the hazardous materials on a waste site. 1910.120(e)
Overwarning on Hazard Labels 1910.1200(f)
Use of direct reading instruments to comply with the monitoring requirements in the Hazardous Waste Operation and Emergency Response interim final rule. 1910.120
Maintenance of and access to employee medical records. 1910.1001(l)(7)(ii), 1910.1025(j)(3)(v)(B)(1), 1910.1020
HCS training for employees contracted to jobs working under the supervision of another employer. 1910.1200(h)
Inability to rig service platforms at the roof level. 1910.66
Cooperation in State or Local Criminal Prosecutions
Letter to Lawrence N. Curcio from Thomas Shepich concerning requirements of the HCS on labeling of IARC category 2B carcinogens 1910.1200
Request for Guidance Relative to Guardrail Requirements for Ladder Jack Scaffolds used on Construction sites. 1926.451
Clarification of Material Safety Data Sheet Requirements Under the Hazard Communication Standard. 1910.1200
Small Purchase Procedures
Hi-Lo "Hard Hat" Radiant Oil Heaters 1926.154