Standard Interpretations
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.
- 1926.550 - Clarification of voltage classification for electric distribution and transmission lines. - 10/21/1986
- 1926.550 - Holding & Hoisting Brakes on Hydraulic Cranes - 11/22/1991
- 1926.550 - Inspection, testing, and operation requirements for Woltman PVE 5021S pile driving equipment. - 02/19/2004
- 1926.550 - Maintaining a safe working perimeter outside a crane's swing radius. - 03/22/1995
- 1926.550 - Necessary precautions required to prevent entry into a swinging superstructure's radius. - 01/16/2003