OSHA requires that any machine part, function, or process that may cause injury be guarded. When the operation of a machine or accidental contact with it can injure the operator or others, the hazards must be eliminated or controlled. One or more methods of machine guarding are required to protect against hazards such as point of operation, nip points, rotating parts, flying chips, and sparks. Guarding methods include barrier guards, two-hand tripping devices, and electronic safety devices.