OPTICAL FIBER-CONTAINING INSULATORS

OPTICAL FIBER-CONTAINING INSULATORS Optical fiber-containing insulators each comprises an insulator body having a through hole provided in its central portion and extending along an axial direction thereof, an optical fiber core wire passing through the through hole, an insulating material filled between an inner peripheral surface of the through hole and the optical fiber core wire, and means for preventing the filled insulating material from axially protruding out of the insulator body even at high temperatures or means for holding the optical fiber core wire at the central portion of the through hole of the insulator body.