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
Exxon's Baton Roughe Refinery Decision to Classify Marine Terminal Docks as Unclassified in Applying NFPA-NEC 1910 - Table of Contents, 1917.1, 1918 - Table of Contents
Respiratory Protection Under OSHA's Ethylene Oxide (EtO) Standard 1910.1047(g)
Flashback Arrestors and Backflow Protective Equipment for Welding Operations. 1910.253
Use of Cranes to Lift Personnel in Drilled Pier Operations 1926.451, 1926.452(o), 1926.651(g)(2)(ii), 1926.550(g)(4)
Roll-over protective-structures on Cary-lift loaders 1926.1000, 1926.1003
Injuries occurring to employees engaged in activities at a company picnic. 1904 - Table of Contents
Use of filler compounds to cover and conceal structural damage to Maritime Cargo Handling Gear 1917 - Table of Contents, 1918 - Table of Contents
Multi-piece Rim Wheel. 1910.177
Electrical safety related work practices applicable to employees operating or working on or nearby, motor control centers in the workplace. 1910.303, 1910.304
Motor vehicle accidents are not within OSHA's jurisdiction 1975.1
DOT has jurisdiction of the trucking industry 1975.1
Apparent inconsistency between the scaffolding requirements in the general industry standard and the construction standard. 1910.28
Approval of temporary power for a construction site. 1926.403(a), 1926.449
Whether or not guards are required for fan blades on an electrical transformer. 1910.212
Storage of flammable and combustible liquids in a storage room within a warehouse facility. 1910.106
Electrical safety related work practices standard. 1910.147
Guarding of Unused portion of metal cutting bandsaws. 1910.212
"Approved" and "Acceptable" equipment has been determined to be safe by a qualified electrical testing laboratory. 1926.403, 1926.449
Welding and Noise in confined space 1926.52, 1926.21, 1926.353
Sampling of Resilient Floor Covering. 1910.1001