Moving walk overspeed switches must activate at no more than what percentage of the rated speed?

Moving walk overspeed switches are critical safety devices designed to halt the operation of the moving walk if it exceeds a specific speed threshold. This is important to ensure passenger safety and prevent accidents that could result from excessive speed.

The correct answer indicates that these switches must activate at no more than 20% of the rated speed. This standard is established to provide a safety margin, allowing for a small buffer that accounts for variations in operational performance while still ensuring that any dangerous increase in speed triggers an immediate stop. It helps maintain a consistent safety protocol across different installations, thereby reducing the risk of mishaps.

Selecting 20% ensures that the system can respond effectively to any malfunction that could lead to excessive speed. Maintaining this threshold reinforces the importance of adhering to specific safety regulations and standards in elevator and escalator operation.