Revolving drums should be guarded by an enclosure that is interlocked with the drive mechanism.

Revolving drums should be guarded by an enclosure that is interlocked with the drive mechanism.

• A. An Enclosure That Is Interlocked with the Drive Mechanism
• B. A Simple Screen
• C. A Loose Fence
• D. A Paint Stripe

Answer: (A)

Guarding rotating machinery should physically prevent access to the moving parts, and it must actively stop the machine if someone tries to open or reach into it. An enclosure that is interlocked with the drive mechanism does exactly that: when the guard is opened, the drive is interrupted so the drum cannot rotate, reducing the risk of entanglement or crush injuries during operation or maintenance. This dynamic protection is much more effective than static barriers. A simple screen doesn’t fully protect because gaps can still allow hands or clothing to reach into the drum, especially given the rotating and potentially fast-moving parts. A loose fence is unreliable and can be bypassed or moved, creating a hazard. A paint stripe offers only a warning and provides no physical barrier or automatic shutdown, so it does not address the risk of contact with moving parts.

Guarding rotating machinery should physically prevent access to the moving parts, and it must actively stop the machine if someone tries to open or reach into it. An enclosure that is interlocked with the drive mechanism does exactly that: when the guard is opened, the drive is interrupted so the drum cannot rotate, reducing the risk of entanglement or crush injuries during operation or maintenance. This dynamic protection is much more effective than static barriers.

A simple screen doesn’t fully protect because gaps can still allow hands or clothing to reach into the drum, especially given the rotating and potentially fast-moving parts. A loose fence is unreliable and can be bypassed or moved, creating a hazard. A paint stripe offers only a warning and provides no physical barrier or automatic shutdown, so it does not address the risk of contact with moving parts.