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Letters of Interpretation

OSHA requirements are set by statute, standards and regulations. OSHA interpretation letters explain these requirements and how they apply to particular circumstances, but they can not create additional employer obligations. OSHA letters constitute their interpretation of the requirements discussed. From time to time, OSHA updates their guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at

Fall Protection for the Entertainment Industry

January 28, 1997—This is a letter of interpretation in response to Mark W. DeLawyer, Secretary and Senior Rigger, International Alliance of Theatrical Stage Employees Local 9 regarding fall protection for the entertainment industry under the Occupational Safety and Health Act of 1970. The original letter was from 1997 but it was edited in 2002 to reflect changes in OSHA policy.

Accident Prevention Signs and Physical Hazard Marking

February 2, 2011— Is OSHA going to update the Code of Federal Regulations (CFR) to reflect the newer ANSI standards? And, if so, when? In the meantime, is OSHA going to incorporate/adopt the newer ANSI standards by letter of interpretation until the CFR is changed?

Fall Arrest Systems: Snap Hook Requirements

September 30, 2010—This letter of interpretation addresses whether or not OSHA will rely on ANSI Z359.1-2007, regarding snaphook compressive strength requirements, in enforcing the general duty clause with respect to personal fall arrest systems in construction.