Which action should be avoided to ensure safety while using an excavator?

Operating near the edge of an excavation should be avoided to ensure safety while using an excavator because this increases the risk of the excavator tipping over or losing stability. Edges of excavations can be unstable, and excessive weight or movement near these areas can lead to catastrophic incidents. Maintaining a safe distance from the edge helps to prevent such accidents and ensures the operator's safety as well as that of other personnel on site.

In contrast, the other actions listed, such as lowering the boom when not in use and retracting the boom before moving, are generally considered standard safety practices that help minimize risks during operation. Following established operational protocols is essential for maintaining safety and efficiency on the job site.