A robotic cartridge picker (92) for a cartridge library (20) has picker fingers (84) for selecting engaging and disengaging a media cartridge (64), and an electronic device (180) carried thereon. A ribbon cable (182) supplies at least one of power and an electrical signal to the electronic device. The robotic picker is rotatably mounted on a mounting block (140). The mounting block has a chamber (188) wherein a portion of the ribbon cable is carried in a variable coiled configuration to accommodate rotation of the robot about an axis (100). The variable coiled configuration facilitates the ribbon cable having a first degree of coiling when the picker robot rotates to a first position and a second degree of coiling when the picker robot rotates to a second position.