What does a boom hoist limiting device include?

A boom hoist limiting device is essential for ensuring the safe operation of cranes and similar lifting equipment. The correct answer is a boom hoist shut-off, which serves a crucial role in preventing unsafe maneuvers by limiting the extent to which the boom can be raised or extended. This device automatically stops the lifting mechanism when a certain height or angle limit is reached, ensuring that the boom doesn’t go beyond safe operational parameters.

The purpose of this safety feature is to protect both the equipment and the personnel by reducing the risk of accidents that can occur from overloading or operating at extreme angles. It ensures that the operator can only operate the hoist within designated safe limits, enhancing overall job site safety.

While other options such as a boom angle indicator help provide crucial information about the boom's position, they do not actively prevent operation beyond safe limits. Similarly, a jib extension does not serve as a limiting device but is an extension used to increase the reach of the boom. A load cell measures the weight being lifted but, like the other options, does not directly prevent overextension or overload by itself. Thus, the boom hoist shut-off is the key component of a limiting device, providing necessary safety during hoisting operations.