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
OSHA's Hazard Communication Standard. 1910.1200
Concerning the conditions under which material data safety sheets are required. 1910.1200
Interpretation of OSHA standards 1910.261(a)(1) and 1910.261(a)(4)(ii) 1910.261, 1910.261(a)(1), 1910.261(a)(4)(ii)
The hazards and regulations related to dry drilling operations.
Ventilation for an anhydrous ammonia refrigeration system. 1910.134, 1910.307(b), 1910.1000, 1910.1200
First Aid treatment required within 3 to 4 minutes of injury 1926.106(d)
Crane equipped with a torque converter. 1926.550(g)(3)(ii)(D)
Respirator rules as applied to open hatch gauging of sour crude oil storage tanks. 1910.134
Cumulative Trauma Disorders at U. S. Postal Service Facilities
Use of NFPA 1124-1988 when inspecting Fireworks Manufacturing Facilities. 1910.109
NIOSH eliminates maximum use concentrations (MUC) labeling requirement for Chemical Cartridges. 1910.134(d)(1)(ii)
Provision of computer generated or FAX transmission MSDSs 1910.1200(g)(9), 1910.1200(g)(10)
Enforcement Guidance - 29 CFR 1910.272(i)(2) - Standard for Grain Handling Facilities 1910.272(i)(2)
Clarification of Instructions for Completing "Number of Employees Covered by Inspection".
Procedures for Tracking Criminal Case Referrals
State of Iowa CASPA.
Orthodontics wires considered as "sharps" under CPL 2-2.69 1910.141
Hepatitis B Vaccine
Automatically Generated Fiscal Reports
Solid State Electronic AC Motor Brakes. 1910.212