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
Fireworks manufacturing and OSHA jurisdiction. 1910.109
Hazwoper training requirements. 1910.121
Training requirements of HAZWOPER. 1910.120, 1910.120(e), 1910.120(e)(6)
Operating a crane in close proximity to overhead power lines. 1910.137, 1926.550
Powered Platform Installations for Building Maintenance 1910.66
Techam LVL Scaffold Plank 1926.451
Standards addressing excavations 1910.120, 1926.652
Ventilation of industrial plants involved in flammable or combustible liquid operations. 1910.106
Hazwoper training in hospitals. 1910.120, 1910.120(q), 1910.1200, 1910.1047, 1910.1047(h), 1910.134, 1910.132
Requirements for clearances behind permanently installed vertical ladders in elevator pits. 1910.27
Use of protective helmets in construction 1926.100(a), 1926.451(h)(1)
OSHA Requirements Addressing Fall Protection Equipment 1926.251
Ground continuity monitoring devices. 1926.404
Lift-slab Bridge Construction 1926.703, 1926.704, 1926.705
Aerial apparatus and ground ladders. 1910.7
Holding & Hoisting Brakes on Hydraulic Cranes 1926.550
The wearing of leather shoes rather than leather sneakers or deck shoes while operating vehicles. 1910.132, 1910.136
Occupational protective footwear for molten metal workers in the foundry industry. 1910.132, 1910.136
Fiberglass and the HCS Standard 1910.1200, 1910.1200(d)
Requirement for Air Sampling in trenches. 1926.651