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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Date Title Standard Number
Strength of scaffold planking. 1926.451
Recording restricted work activity. 1904 - Table of Contents
Applicability of the Machine Guarding and Lockout/Tagout standards to printing presses 1910.147, 1910.212, 1910.219
Labeling requirements of hazardous chemicals. 1910.1200
Use of power strips. 1910.305
Review of Avondale Shipyard in Avondale, Louisiana.
Back-up alarm requirements on vehicles. 1917.43(c)(5), 1918.65(f)(1)
Is Lockout/Tagout applicable to television transmission towers. 1910.147
Black liquor recovery boilers, associated oil (or gas) auxiliary fuel burner systems and PSM. 1910.119
Sweeper/scrubber equipment is not considered a powered industrial truck. 1910.178
Recording restricted work activity. 1904 - Table of Contents
Request to include SOCMA in the chemical process operator certification training program.
Recordability of bloodborne pathogenic exposure incidents. 1904 - Table of Contents
Use of a powered industrial truck to dump hexamine into a hopper of a bucket elevator. 1910.178
Deadlines for completion of process hazard analysis. 1910.119
Industries involved in peanut production. 1910.272
Coverage of Ear Piercing. 1910.1030
Reasonable accessibility of medical assistance for construction sites. 1926.50
Physical qualification requirements for equipment operators. 1926.550(b)(2)
Refresher training requirements. 1910.119