Here's what OSHA says about what interpretation letters are and how to use them:
A letter of interpretation 'provides supplementary guidance that clarifies how to apply to a specific workplace situation a policy or procedure disseminated through the Code of Federal Regulations or the OSHA directive system. [Interpretation letters] may not interpret the OSHAct, or establish or expand OSHA policy. [Interpretation letters] may answer questions posed by OSHA, employers, employees, or other parties.' (ADM 8-0.3, Chapter 5, Definitions, 'Letter of Interpretation').
OSHA requirements are set by statute, standards, and regulations. Interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. The letters constitute OSHA's interpretation of the current requirements; however, 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
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