Which factor is crucial when performing multiple crane lifts?

When performing multiple crane lifts, ensuring that the cranes do not exceed 75% of their rated capacity is a fundamental safety practice. This approach provides a safety margin that helps prevent accidents due to overloading. Operating within this limit allows for unanticipated conditions, such as wind or load shifts, without risking the stability and safety of the crane and its load. Additionally, adhering to this guideline helps extend equipment life and maintain compliance with safety regulations, thereby significantly reducing the likelihood of equipment failure during operations.

The other factors, while they may serve specific roles in crane operations, do not address the immediate concerns of weight capacity and safety associated with multiple lifts. For instance, the color of the cranes can affect visibility but does not influence their operational safety regarding load limits. Rotating operator duties may help prevent fatigue, but it is not directly related to the capacity and safety of the lifts themselves. Similarly, while a nearby water source may be relevant for firefighting or emergency procedures, it does not impact the safety protocols required for crane operation under load. Therefore, ensuring cranes do not exceed 75% of their rated capacity stands out as the most critical factor in this situation.