Which device prevents drive power if slack is detected?

• A. Traveling Cable Tracking
• B. Tilt Seat
• C. Slack Cable Safety Device
• D. Footrest Switches

Answer: (C)

Drive power is cut when there’s a problem in the drive train, specifically a loss of tension in the drive cables. The Slack Cable Safety Device monitors that tension, and if slack is detected beyond safe limits, it interrupts power to the drive so the escalator cannot move with uncontrolled cable slack. This prevents belt slip, mis-tracking, or other dangerous conditions while riders are on the system.

Traveling Cable Tracking keeps the traveling cables aligned and prevents wear or snagging, but it doesn’t stop drive power due to slack. Tilt Seat and Footrest Switches relate to rider presence or seating conditions, not to detecting drive-cable slack to stop motion.