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
The size of fire extinguisher for contruction equipment. 1910.157
The size of fire extinguisher for construction equipment. 1910.157, 1926.150, 1926 Subpart F
Handrail and railing clearance for runways (hangar catwalks). 1910.23(e)(6)
Request for a permanent variance and interim order. 1905.11, 1910.261
OSHA enforcement of Safety and Health requirements which apply to bungee jumping from cranes. 1926.550(g), 1975.3
Request for a permanent variance and an interim order regarding pressure vessel safety valve configuration. 1905.11, 1910.261
Scissor lift use requirements.
Clarification concerning the Electric Power Generation, Transmission, and Distribution standard. 1910.147
Compliance determination by OSHA concerning the use of radio-frequency-activated pagers for meeting the requirements of Employee alarm systems. 1910.165
Clarification of the use of powered industrial trucks in Class I, Division 2, Group C locations. 1910.178
The determination of medical treatment of OSHA injury and illness recordkeeping purposes. 1904 - Table of Contents
The proper recording of hearing loss on the OSHA Form 200. 1904 - Table of Contents
The proper recording of occupational sprains and strains. 1904 - Table of Contents
Confirmation that mixing of liquefied butane, transferred by a CTMV, with gasoline stored in atmospheric tanks at terminals is not covered by the PSM Standard. 1910.119
Face and Eye Protection for Phlebotomists.
The adequate guarding of a process pump. 1910.212
The proper recording of cumulative trauma disorders for OSHA injury and illness recordkeeping purposes. 1904 - Table of Contents
OSHA standards addressing reverse signal alarms on excavators 1926.602
Clarification of New Nonformal Complaint Process. 1903.11
Applicability of fall protection requirements/fall protection for waste collection and landfill activities. 1926.500(a), 1926.501(b), 1910 Subpart D, 1910 Subpart I