When working in an elevated position, especially above live or moving parts, employers shall assure the security of position and support, and precautions should be taken to avoid dropping tools or materials.
34 Pa. Code § 39.416
This section cited in 34 Pa. Code § 39.461 (relating to general requirements); 34 Pa. Code § 39.471 (relating to general requirements); and 34 Pa. Code § 39.491 (relating to general requirements).