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
Colored location indicating lights. 1910.37
Aisles and Passageways. 1910.22
Fiberglass storage tanks for crude oil storage is acceptable. 1910.106(b)(1)(i)
Plugging into an unprotected outlet with a portable GFCI would be in violation of the standard. 1926.401
Double insulated tools on construction sites. 1926.400
Interpretation on metal manhole ladder standards. 1910.268(h)(8)
Guidance in relation to rules and regulations governing warehousing and transportation of powder-actuated tool cartridges. 1910.109
Additional Requirements for Safeguarding Typographical Errors. 1910.217
The storage of flammable and combustible liquids. 1910.106
Interpretation of Lockouts. 1910.261(b)(1)
The meaning of concurrent when related to two-hand controls on Mechanical Power Presses. 1910.211
The safety of telephone company personnel working under inclement weather conditions and also while exposed to induced currents and energized conductors. 1910.268, 1910.268(m)
Guarding of Punch Presses. 1910.217
The size of opening in the wire mesh mounted in the canopy structures of wheel and crawler tractors. 1926.604
Overhead and Gantry Cranes. 1910.179
Inspection of Compressed Gas Cylinders. 1910.166
Paint Spraying Operations. 1910.107
Temporary planked or metal-decked floors. 1926.500
Man-lift standards and interpretations. 1926.550
"Electrical Disconnect Means" as they relate to center pivot irrigation systems. 1928.57(c)(5)(ii)