Final answer:
Any moving part of mechanical power-transmission apparatus that is seven feet or less above the floor must be guarded to prevent injury.
Step-by-step explanation:
Any moving part of mechanical power-transmission apparatus (e.g., flywheels, belts, spindles, pulleys, gears, etc.) that is seven feet or less above the floor or platform must be guarded. This safety requirement is to prevent injury to workers who may come into contact with these potentially dangerous parts. Proper guarding can include barriers, enclosures, or covers that prevent access to moving parts. Employers must ensure these guards are in place and that they are maintained to safeguard the health and safety of employees.