One of the limit switches on a crane is known as what?

The correct choice identifies the limit switch on a crane as an anti two-blocking device. This device is crucial for crane operation as it prevents two-blocking, a dangerous situation that occurs when the hook block comes into contact with the boom, which can lead to equipment failure or accidents. The anti two-blocking device typically includes sensors that detect the positioning of the hook and boom, providing a safety mechanism that stops the crane's operation to prevent this harmful contact.

Understanding the role of the anti two-blocking device highlights the importance of safety features in crane operations, ensuring both the safety of the operator and the integrity of the equipment. This device supports safe lifting practices by allowing the crane operator to lift loads without the risk of damaging the crane or endangering people nearby.