For revolving drums, the enclosure guarding must be interlocked with what?

For revolving drums, the enclosure guarding must be interlocked with what?

• A. The Drive Mechanism
• B. The Electrical Supply
• C. The Coolant System
• D. The Guard's Own Weight

Answer: (A)

The key safety idea is that guarding for revolving drums must be tied to the part of the machine that actually drives the rotation. Interlocking the enclosure with the drive mechanism ensures that if the guard is opened or removed, the drum cannot start or continue turning. This directly prevents hands or clothing from contacting moving parts, even if power is present but the guard is open. Relying on the electrical supply alone isn’t as reliable because the drum can coast or be restarted, whereas an interlock with the drive actively stops motion when the guard isn’t in place. The coolant system and the guard’s own weight don’t control or stop the rotation, so they don’t provide the same level of protection.

The key safety idea is that guarding for revolving drums must be tied to the part of the machine that actually drives the rotation. Interlocking the enclosure with the drive mechanism ensures that if the guard is opened or removed, the drum cannot start or continue turning. This directly prevents hands or clothing from contacting moving parts, even if power is present but the guard is open. Relying on the electrical supply alone isn’t as reliable because the drum can coast or be restarted, whereas an interlock with the drive actively stops motion when the guard isn’t in place. The coolant system and the guard’s own weight don’t control or stop the rotation, so they don’t provide the same level of protection.