When must governors be equipped with over speed switches on a non-static driven personnel hoist?

Governors equipped with over speed switches are critical safety components in elevating devices, particularly in non-static driven personnel hoists. The application of these switches is mandated to prevent dangerous conditions that can arise from excessive speed.

For non-static driven personnel hoists specifically, regulations state that when the speed exceeds 250 feet per minute (fpm), over speed switches are required. These switches monitor the speed of the hoist and automatically activate safety mechanisms if the hoist begins to exceed safe operational limits. This is important because excessive speed can lead to malfunctions or accidents, posing serious risks to passengers and equipment.

In contrast, speeds below 250 fpm generally do not necessitate advanced over speed protective measures, as the lower operational speeds are typically considered safer for protocols already in place. The requirement for over speed switches at this threshold highlights the importance of maintaining safety standards and ensuring that appropriate control systems are in place for higher speed operations.