Provided is a twisted wire including a plurality of covered wires twisted together, each covered wire including a conductor and an insulator covering the periphery of the conductor, wherein the twisted wire satisfies Inequality (1): y<A×x/(z/500)+B (wherein x: a pitch length (mm) of the twisted wire, y: a collapsing rate (%) of the insulator, z: an elastic modulus (MPa) of the insulator, A: Constant A=−1, and B: Constant B=11.5).

An electric wire conductor 10A comprising a wire strand comprising a plurality of elemental wires 1 twisted together, the wire strand comprising a deformed part in which a cross-section of the wire strand intersecting an axial direction of the wire strand is formed into: a flat shape in which a width W of the cross-section is larger than a height H of the cross-section, or a sector shape comprising either a single edge or two edges touching each other at an apex and an outward curve connecting the ends of the single edge or the two edges, the elemental wires 1 having, in the cross-section of deformed part, deformation ratios from a circle of 70% or lower at an outer peripheral part facing an outer periphery of the deformed part than at a center part located inside the outer peripheral part. Further, a covered electric wire has such an electric wire conductor 10A and an insulator to cover an outer periphery of the electric wire conductor 10A. Furthermore, a wire harness includes such a covered electric wire. In addition, such an electric wire conductor 10A is manufactured by performing a compression step pressurizing a raw wire strand comprising elemental wires twisted together with rollers from a first direction and a second direction which intersect an axial direction of the raw wire strand and oppose each other.

An electric wire conductor is excellent in space saving and flexibility and is less likely to concentrate a load on specific elemental wires, and a covered electric wire and a wire harness contain the electric wire conductor. The electric wire conductor contains a wire strand containing a plurality of elemental wires twisted together. The wire strand has a sector-shaped part in which a cross-section intersecting an axial direction of the wire strand contains either a single edge or two edges touching each other at an apex, and an outward curve connecting the ends of the single edge or the two edges. In the sector-shaped part, the elemental wires having deformation ratios from a circle lower at an outer peripheral part facing an outer periphery of the sector-shaped part than at a center part of the sector-shaped part located inside the outer peripheral part in the cross-section intersecting the axial direction.

Embodiments of the disclosure relate to a method of preparing a bundled cable. In the method, a plurality of subunits is wound around a central member in one or more layers of subunits to form the bundled cable. For a section of the central member, each layer of subunits has a pitch over which a subunit of the layer of subunits makes one revolution around the section of the central member and a length of the subunit required to make the one revolution. The subunits are configured to have a nominal helical length equal to the ratio of a nominal length to a nominal pitch. Further, in the method, a measurement of the bundled cable is monitored, and a winding rate of the plurality of subunits is adjusted based on the measurement in order to account for deviations from the nominal helical length.

An apparatus configured to twist a first wire about a second wire is presented herein. The apparatus includes a securing mechanism configured to secure ends of the first wire and the second wire. The first wire is arranged parallel to the second wire along a longitudinal axis. The apparatus also includes a gripping mechanism configured to grip central portions of the first and second wires such that inner surfaces of the central portions of the first and second wires are in contact with one another and a rotating mechanism configured to rotate the gripping mechanism, thereby twisting the first and second wires about one another. A method of twisting a first wire about a second wire is also presented herein.

An apparatus (1) is designed to manufacture a twisted wire by twisting a plurality of electric wires (101), and includes an raising and lowering unit (2), an twisting unit (3), and a control unit (4). The raising and lowering unit lifts the plurality of electric wires and lowers the manufactured twisted wire, and includes: a raising and lowering portion (6); a guiding portion (7) vertically guiding the raising and lowering portion; and a raising and lowering mechanism (8) capable of switching a raising and lowering speed of the raising and lowering portion to a high speed or a low speed.

A bare overhead electrical cable and a method for the manufacture of an overhead electrical cable. The electrical cable includes a central strength member and at least two conductive layers surrounding the strength member, the two conductive layers being formed from first and second conductive strands respectively. The first conductive strands are formed from first aluminum material and the second conductive strands are formed from a second aluminum material, where the second aluminum material has at least one material property that is different than the same material property of the first aluminum material. For example, the second conductive strands may be formed from an aluminum material having a lower conductivity but higher hardness than the first aluminum material. Such a configuration may be useful when the overhead electrical cable is installed in a geographic region that is subject to heavy ice loading.

A twisted wire producing apparatus includes an electric wire twisting unit that twists two electric wires, a controller that controls the electric wire twisting unit, and a tension adding part that adds tension to the two electric wires. The electric wire twisting unit includes a one end chuck part, the other end chuck part, and chuck rotating parts for rotating the one end chuck part and/or the other end chuck part under control of the controller. The other end chuck part includes a base, a chuck main body, twist prevention parts, and a wire length difference absorbing part. The wire length difference absorbing part includes an inter-electric wire inserting part which is movable in a direction perpendicular to the electric wires extending direction.

A twisted wire producing apparatus includes an electric wire twisting unit that twists two electric wires, a controller that controls the electric wire twisting unit, and a tension adding part that adds tension to the two electric wires. The electric wire twisting unit includes a one end chuck part, the other end chuck part, and chuck rotating parts for rotating the one end chuck part and/or the other end chuck part under control of the controller. The other end chuck part includes a base, a chuck main body, twist prevention parts, and a wire length difference absorbing part. The wire length difference absorbing part includes an inter-electric wire inserting part which is movable in a direction perpendicular to the electric wires extending direction.

A wire (10) is disclosed. Said wire (10), when viewed in cross-section, has at least one first portion (12) and at least one second portion (14) that are interconnected by a third portion (16) in which the wire (10) has a reduced cross-section.