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
Enforcement of OSHA standards at DOE nuclear facilities
The laboratory standard does not apply to a pharmacy operation mixing cytotoxic drugs. 1910.1450(a)(1)
Application of the formaldehyde standard, 1910.1048, to private medical school personnel 1910.1048
Handling of needles and syringes near bloodborne hazards
OSHA Instruction CPL 2.51E Revision.
Brake drawbar drag requirements for forklifts. 1910.178(a)(2)
A Nurse Call Communication System. 1975.3
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)
First Aid treatment required within 3 to 4 minutes of injury 1926.106(d)
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
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)