A radius limiting portion is present in each fiber optic cable guide that prevents fiber optic cables from being bent beyond their minimum bend radii. Over the copper cables, the fiber optic cables have clear advantages. There is more security, and compared to any other wire available the fiber optic cables or fiber pigtail are more reliable. This optic cable is in a high voltage environment. In this paper dry-band voltage of the polluted sheath's surface of the all-dielectric self-supporting fiber optic cable is analyzed.