Abstract: To firmly hold a high-voltage wire apart from its surroundings, and hold some nearby lead wires apart from the high-voltage wire, a wheel-like wire holder includes a ring, a central hub, and a plurality of spokes connecting the central hub to the ring. The central hub defines a central space to allow a high-voltage lead wire to fit therein, wherein the ring and hub have cuts on their circumferences, which cuts are connected by two spokes to define a radial passage for the central space to communicate with an exterior of the ring. The cut of the ring is adapted to be open and closed, and the ring has an extra space defined next to the cut for accommodating another lead wire thereinside, with the extra space being adapted to be open and closed.

Abstract: Polymer Insulator which is characterized by a rode having on its outer surface an umbrella-like housing or insulator layer and having end portions which are formed so as to freely expand with at least one splitting groove; a fixture having a mounting hole in which the end portion of the rod is inserted and which has an inner surface tapering inwards against which the outer surface of said rod abuts in its expanded state; and a wedge fixed in said mounting hole, the wedge being inserted into a splitting groove formed in the end portion of the rod when the end portion of said rod is mounted into said mounting hole of said fixture, the top end of the wedge having an engaging portion which is held in the splitting groove thereby to cause the whole wedge to engage in the splitting grove.