LMI should be installed on cranes with lifting capacities of what minimum weight?

Load Moment Indicators (LMI) are critical safety devices used on cranes to prevent overloading by continuously monitoring the load being lifted. The requirement for installing an LMI is typically influenced by the lifting capacity of the crane, as higher capacities present a greater potential for dangerous situations if overload occurs.

In this context, the correct choice indicates that any crane with a lifting capacity of 3 tons and above necessitates the installation of an LMI. This minimum threshold is determined by safety standards and regulations, which aim to ensure that cranes operating at higher capacities have the necessary technology to provide operators with real-time feedback about the loads they are handling. By requiring LMI for cranes of this capacity, the risk of accidents due to overloading is significantly reduced.

Lower lifting capacities, such as those under 3 tons, may not be subject to the same level of scrutiny due to the minimized risk associated with lighter loads. Consequently, these cranes might not require LMI, as the likelihood of severe accidents is lessened. The installation of LMI serves a vital role in maintaining safety standards and operational integrity for equipment that can potentially lift heavier weights.