Electrical limits mounted where and why?

• A. On ceiling to adjust height
• B. Mounted for each landing to control stopping
• C. On control panel to log events
• D. At base to start

Answer: (B)

Electrical limits act as the stop signal for the escalator, telling the controller to halt the drive when the car reaches a landing. Placing these limits at each landing ensures the car stops at the exact floor where passengers board and disembark, preventing overshoot or misalignment with the doorway and maintaining a safe, level boarding surface. When the car reaches a landing, the limit switch opens or changes the control circuit to stop the motor or apply the brake, securing a precise stop. Putting limits on the ceiling, or on a control panel for logging, or at the base to start, wouldn’t provide the floor-specific stopping signal needed for safe, reliable operation.