What must be done to ensure a tower crane is stable?

The stability of a tower crane is critically dependent on the proper installation of its legs. When all legs are correctly installed and secured, they provide a solid base that helps distribute the load evenly and enhances the crane’s overall structural integrity. This setup minimizes the risk of tipping or wobbling during operations, ensuring that the crane can safely handle designated loads without risk of equipment failure or accidents.

In contrast, increasing the load can introduce additional stresses that may overwhelm the crane’s structural capacity, especially if not matched to the crane's specifications. Keeping the load close to the ground does enhance safety and stability in terms of reducing the risk of overturning, but it does not address the foundational stability of the crane itself. Limiting the swing of the load can help in preventing dynamic forces from affecting stability, yet it is still secondary to ensuring that the crane's legs are correctly installed, as this is fundamental for maintaining the crane’s overall balance and stability during operation.