When it comes to lifting transformers, aerial devices equipped with jibs are one of the handiest tools available to lineworkers. Compared to old methods for transformer replacement – which required workers to climb the pole and use a pulley to manually lift the transformer – using a jib is safer, easier and more productive.
Most aerial devices sold to companies in the utility industry are equipped with jibs. However, not all jibs are the same, and the user should evaluate the type of work to be done when choosing the equipment for the job. Consider whether the tasks are construction or maintenance work on distribution or transmission lines. Before dispatching to the job, workers should know how the lines are situated relative to where the vehicle can be located. In addition, the weight of the load will determine the capacity of the aerial device and jib needed.
In the remainder of this article, we will provide an overview of the four key areas that inform good practice for using jibs: knowing your equipment, inspecting your equipment, knowing the load and understanding proper setup.
Know Your Equipment
There are many different styles of jibs with varying capacities available on different boom and platform configurations, including side mount, underslung, end mount and jibs that rotate with the platform. There also are fixed-length jibs, jibs that can be manually re-pinned to provide various extensions, and jibs with one or more sections that are hydraulically extendable. Some units are designed with the load line above the jib boom and some are below. Other jibs are equipped with sheaves that allow only non-overcenter lifting, while some can do either overcenter or non-overcenter lifting.