Which device regulates lift speed to prevent accidents?

• A. Data Plate
• B. Speed Governor
• C. Slack-Rope Device
• D. Final Terminal Stopping Device

Answer: (B)

The device that regulates lift speed to prevent accidents is the speed governor. It’s connected to the drive system and continuously monitors how fast the escalator or moving walk is moving. If the speed begins to creep above the safe limit, the governor acts—typically by adjusting the drive or applying braking—to bring the speed back to the rated value. This direct control of motion is what prevents overspeed, which could injure passengers or damage components.

Other devices have protective roles but don’t regulate speed. The data plate is just a label showing the rated speed and other specs. The slack-rope device checks for rope tension and will stop the unit if the rope becomes too slack, not control travel speed. The final terminal stopping device is concerned with stopping action at the end of a run to protect the equipment and riders, not regulating speed during normal operation.