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Articulated Aerial Lift Devices:

A very common design used by the electrical power industry is what is known as the articulated aerial lift device.  The picture at the right is a Telelect T-5000 series "insulated" articulated aerial lift device.  It is marketed for the purpose of providing up to 63,000 volts AC protection to operators of the device through the use of an upper non-conductive boom (white section of upper boom) and a non-conductive lower insert (white section of lower boom). 

Articulated insulated aerial lift devices come in an overcenter or a non-overcenter configuration equipped with either a single bucket or double bucket mounted at the end of the upper boom section.  The articulated insulated aerial lift device sits on a truck chassis. It has a pedestal platform, or turret, to which the lower boom is attached. The upper boom is attached to the lower boom via a metal elbow joint. The bucket and the material handling attachment (if equipped) are located at the upper end of the upper boom. The lower and upper sections of the boom can be independently operated for better positioning.  Additionally, the operator controls at the bucket station are connected by non-conductive hoses. The upper boom and bucket liner are subjected to periodic ANSI approved testing procedures. The upper boom is usually tested to 60kv and the bucket liner to 50kv.