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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Filters


Date Title Standard Number
Changes to asbestos warning signs and ANSI warning signs 1910.1001(j)(4)(ii)(A), 1910.6(e)(67), 1910.261(c), 1910.97, 1910.145, 1926.200
Asbestos sampling protocol cannot be used for objective data 1910.1001(d)(2)(iii), 1915.1001(f)(2)(iii)(A), 1926.1101(f)(2)(iii)(A)
Minimum approach distances to electric power transmission and distribution lines during the installation of protective grounds 1910.269(l), 1910.269(l)(3), 1910.269(m), 1910.269(m)(3), 1926 Subpart V, 1926.960(c), 1926.960(c)(1), 1926.961(c), 1926.961(c)(7), 1926.962
Heat energy estimates for arc-rated protective clothing and faceshields for open-air work on multi-phase overhead power lines. 1910.135, 1910.269(l), 1910.269(l)(8), 1910.269 App E, 1926.960(g), 1926 Subpart V, 1926 Subpart V App E
Active Barrier Apparel as Engineering Control 1910.1030(d)(3)(i)
The labeling elements required on the safety data sheet (SDS) under the Hazard Communication Standard (HCS 2012) 1910.1200(g)(2)
Extension cord manufacturers warning and compliance with electrical equipment - Installation and use. 1926.403(b)(2)
Container labeling of non-pesticide agrichemical products packaged for shipment 1910.132(d), 1910.1200, 1910.1200(f)(1)
HCS labeling of imports and exports 1910.1200, 1910.1200(b)(4), 1910.1200(f)(1), 1910.1200(f)(6)
Clarification of 'at least every 12 months' annual crane inspection requirement. 1926.1412(f)(1)
Guarding requirements for 50 volts or more DC. 1910.303(g)(2)(i)
Guarding energized equipment at voltages below 60 volts DC. 1910.303(g), 1910.303(g)(2)
Labeling of small containers in the laboratory 1910.1200(f)(6), 1910.1200(f)(6)(i), 1910.1200(f)(6)(ii), 1910.1450(e), 1910.1450(h)(1)
Use of 1994 HCS labels on containers packaged for shipment 1910.1200, 1910.1200(j)(2)
Hazard communication pictograms; single color and economic feasibility 1910.1200(f), 1910.1200 App C
Hepatitis B Virus Antibody Testing 1910.1030(f)
Respirator Requirements During Wet Abrasive Blasting 1910.94(a), 1926.57(f)
The requirements for reporting safety data sheet (SDS) information under the Hazard Communication Standard 1910.1200
Lockout of tagout requirements for electrical hazards 1910.333(b)
Lockout/tagout of electrical hazards by workers who install, maintain, repair or replace premises wiring systems. 1910.147(a), 1910.147(c), 1910.147(f), 1910.333(b), 1910.333(c)