OVERHEAD WIRE

摘要

An overhead cable in which the outermost surface is formed by twisting together a plurality of segment strands, wherein a plurality of spiral grooves forming recesses having substantially rectangular cross-sections are provided at intervals in a circumferential direction at part of an outer circumferential surface of the segment strands or at the outer circumferential surface regions of boundary portions where the twisted segment strands adjoin each other and where the spiral groove is formed to satisfy 1 < W/h < 16 where the width is W and the depth is h. The outermost layer is formed by thin segment strands and at least one thick segment strand, and spiral projections are formed satisfying 0.01 < H/D < 0.10 and 10 DEG < &thetas; < 90 DEG where the step difference between the outer circumferential surface of the thin segment strands and the outer circumferential surface of the thick segment strand is H, the outer diameter of the overhead cable demarcated by the thin segment strands is D, and the center angle of the thick segment strands is &thetas;. Further, a recessed portion is provided at one side surface among two surfaces of the segment strands forming the outermost layer, a projecting portion is provided at the other side surface, and the strands are twisted together so that the recessed portions and the projecting portions are made to mate. Further, the recessed and projecting portions formed at the two side surfaces of the segment strands are mated with each other to form recess-projection mating portions, and the lengths of contact of recessed and projecting surfaces at recess-projection mating portions is made not more than 10% of the length of the recess-projection mating portions. As a result, the wind load resistance, wind noise, etc. are reduced and the strains are prevented from sticking out etc.