a tool for installing a string of insulator discs in an energized high voltage line is mounted on a hot stick . the tool comprises a pair of pivoting jaws adapted to securely grasp a string of insulators , and a hook mounted on one of the jaws for suspending the tool from the energized line . the improved tool allows a single worker to grasp an insulator disc string with the tool and suspend the disc string near an energized line . subsequently , this worker can assist in fastening the cable clamps of the insulator string to the energized line .