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
Albumin Human USP and the standard. 1910.1030
Extension cord equipped with a built-in "continuity tester". 1910.304
Use of overhead bridge and gantry cranes as work platforms. 1910.179
Frame grounding of arc welding machines. 1926.351
Proper recording of a hepatitis A exposure for OSHA injury and illness recordkeeping purposes. 1904 - Table of Contents
Recording cases on the OSHA log that involve Bloodborne Pathogens. 1904 - Table of Contents
Meeting labeling requirements of hazard communication standard for slag wool. 1910.1200(f)
First Aid program requirements where a medical facility is near the workplace. 1910.151
Platforms and ladders on communication towers. 1910.23, 1910.27
OSHA jurisdiction over employees working in an Indian reservation clinic. 1975.4(b)(3)
Variance request on conditions surrounding a citation under litigation. 1926.556
Recording TB related cases on the OSHA 200 log. 1904 - Table of Contents
Request for approval of guardrail system. 1926.500
Health and safety plans for hazardous waste operations & emergency response. 1910.120
Construction industry general duty clause, and the bloodborne pathogens standard. 1910.1030
Operation and maintenance of railway cranes.
Distance reinforcing steel can protrude before guarding is required. 1926.701
Use of compressed air when cleaning arsenic and lead contaminated surfaces 1910.1018(k)(2), 1910.1025(h)(2)
McDermott, Inc/Gates Construction Co. inspection workers considered as seamen. 1915.2(b)
Engine cut off switch for an elevated work platform. 1910.178