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
Use of NFPA 1124-1988 when inspecting Fireworks Manufacturing Facilities. 1910.109
Provision of computer generated or FAX transmission MSDSs 1910.1200(g)(9), 1910.1200(g)(10)
NIOSH eliminates maximum use concentrations (MUC) labeling requirement for Chemical Cartridges. 1910.134(d)(1)(ii)
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.
Hepatitis B Vaccine
Orthodontics wires considered as "sharps" under CPL 2-2.69 1910.141
Automatically Generated Fiscal Reports
Solid State Electronic AC Motor Brakes. 1910.212
Bay Nets Safety System. 1910.23(a)(5)
Guarding of machinery in bowling centers. 1910.147, 1910.212
Medical surveillance provisions in the Hazardous Waste Operations and Emergency Response standard. 1910.120(f)(2)
The Field Sanitation Standard, as it relates to the number of workers excluded from coverage. 1928 - Table of Contents
Inspecting and maintaining fire extinguishers. 1910.157(e)(1), 1910.157(e)(3)
The rung spacing between horizontal members of the end frames of metal scaffolds used as ladders rungs for access or egress. 1910.28, 1910.29
Head clearance requirements for fixed ladders used on FAA radio communication towers. 1910.27(c)(1), 1910.268(a)(3), 1910.268(h)
Formaldehyde standard and private medical school personnel 1910.1048
Application of the HCS MSDS requirements to distributors selling hazardous chemicals to consumers and employers. 1910.1200