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
Labels and hazard warnings. 1910.1200
Hazard determination for carcinogenic compounds 1910.1200
Hazard Communication Standard and Material Safety Data Sheets. 1910.1200
The proper use of "U" bar guards to temporarily guard flush manholes opened during shipbuilding or ship repair operations. 1915.73(b)
Working distances between employees and energized conductors. 1926.950
Highly Hazardous Chemicals as it applies to toxic or reactive chemical mixtures which are not explosive and which are not flammable liquids or gases. 1910.119
Proper recording of a bloodborne pathogens case. 1904 - Table of Contents
Highly Hazardous Chemicals as it applies to solid propellant rocket motors. 1910.119
Members of a HAZMAT team. 1910.120
Highly Hazardous Chemicals applies to aqueous solutions of Hydrogen Fluoride. 1910.119
All electric tools need to be tested by a qualified national testing laboratory and be listed and labeled 1926.449, 1926.302(a), 1926.403(a), 1926 Subpart K
De minimis violations are not included in a citation. 1926.550(f)(1)(iv)
IMIS Software Release CPLN 5.4.0.
OSHA does not cross reference general industry and construction standards. 1910.146, 1926.21
Demolition regulations do apply to the removal of ceilings and interior non-load bearing walls and partitions 1926.850(a), 1926 Subpart T, 1926 Subpart L
Highly Hazardous Chemicals as it applies to "Dowtherm". 1910.119
Exemption from wearing hard hats. 1910.132, 1910.135
Passenger seat belts not required on school buses 1926.601(b)(9)
Statement of compliance for skylights.
Using compressed air for cleaning an employee's body and clothing 1910.242, 1910.242(b), 1917.154