What safety device is required on lattice boom cranes manufactured after November 8, 2011?

Lattice boom cranes manufactured after November 8, 2011, are required to have an anti-two block prevention device. This safety feature is critical in preventing a dangerous condition known as "two blocking," which occurs when the hook and block assembly comes in contact with the upper load line or other crane components, potentially damaging the equipment and posing serious risks to personnel.

The anti-two block prevention device functions by providing a mechanism that actively prevents the hook from traveling too high, thereby eliminating the possibility of two blocking occurring. It is an essential safety feature that enhances the operational safety of the crane. The implementation of this device aligns with updated regulations aimed at improving safety standards in the crane operation industry.

In contrast, while load cell indicators, anti-two block warning devices, and emergency communication systems are important tools for crane safety, they are not specifically mandated as standard safety equipment for lattice boom cranes under the regulation change relevant to the date cited.