Abstract: An overhead cable is provided that comprises a tension-bearing core of twisted steel strands, a conductive layer of aluminum strands arranged at the outer circumference of the twisted steel strands, and an outermost layer arranged at the outer circumference of the aluminum strands. The outermost layer is formed by twisting together a plurality of adjoining segment strands. A spiral groove is provided in the longitudinal direction along the boundary portion of the outer circumferential surface of each adjoining segment strand. Along the contour of a cross-section of this outermost layer, each groove comprises an arc-shaped curve having a radius R centered around a vertex of a regular polygon. Each part between adjoining grooves comprises an arc-shaped curve which is concave with respect to a straight line connecting adjoining of a regular polygon, intersecting the arc-shaped curve with radius R.

Abstract: An overhead cable includes an outermost surface formed by twisting together a plurality of segment strands. A plurality of spiral grooves form recesses having substantially rectangular cross-sections and are provided at intervals in a circumferential direction of either the outer surface of the segment strands or the outer surface regions of boundary portions where twisted segment strands adjoin each other. Thin segment strands and at least one thick segment strand form the outermost layer. 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 mate.

Abstract: An overhead cable designed to reduce the wind load acting upon the overhead cable in the lower wind speed zone even in a cable having a relatively small diameter, provided with twisted steel strands 1 serving as the tension-bearing core, aluminum strands 2 serving as a conductive layer arranged at the outer circumference of the twisted steel strands 1, and an outermost layer arranged at the outer circumference of the aluminum strands 2, constituted by twisting together a plurality of adjoining segment strands 3, and provided with a spiral groove Tr along the longitudinal direction in the outer circumferential surface region of each boundary portion of adjoining segment strands 3, wherein in the contour of the cross-section of this outermost layer, each groove Tr is comprised by an arc-shaped curve having a radius R centered around a vertex Ap of the regular polygon, and each part between adjoining grooves Tr is comprised by an arc-shaped curve which is concave with respect to a straight line connecting adjoin