What safety feature must be in place on rotating gears or chains under normal operating function?

• A. Guards
• B. Shields
• C. Barriers
• D. Enclosures

Answer: (A)

The main idea is preventing contact with moving parts. A guard is the designed physical barrier that covers or encloses exposed gears or chains so fingers, clothing, or tools can’t reach into the moving area during normal operation. This direct protection stops dangerous contact before it can cause injury, and it should be securely installed and maintained so it remains effective as long as the machine runs. Guards are expected to cover all exposed parts and be robust enough to withstand foreseeable hazards, while still allowing safe maintenance when the machine is shut off. Shields, barriers, and enclosures relate to safety but aren’t the specific device intended to prevent access to moving parts during normal operation; shields are often just plates, barriers may keep people away without blocking contact, and enclosures fully surround the machine in some layouts. Therefore, the required safety feature is guards.