Which equipment is used to physically prevent access to moving parts and is typically mounted around a machine perimeter?

• A. Curtain
• B. Light
• C. Sensor
• D. Guard

Answer: (D)

Physical safeguarding relies on a rigid barrier around moving parts to prevent access. A guard is that barrier: a solid enclosure typically made of metal or rigid material mounted around the machine perimeter to keep hands, clothing, and other body parts away from dangerous moving components. This ensures a physical stop if someone tries to reach in, and many guards are designed to interlock with the machine control so the equipment cannot run when the guard is open or removed. Other options like curtains, lights, or sensors can support safety by slowing or detecting intrusion, but they do not by themselves provide the robust physical barrier that a guard offers.