Here described is the production of wires, strands, rigid ropes and flexible ropes having high electric, physico-chemical and environmental performances for the purposes of electrical conduction, enhanced through multilayer deposition containing graphene, and a method for their preparation. Each single wire, strand, rope and/or cable according to the present invention is produced through electrochemical deposition processes and/or of a different nature, in order to potentiate electric, physico-chemical and environmental performances (in particular electric conductivity) and the resistance to the thermal and corrosive actions of said wire, strand, rope and/or cable, facilitating furthermore subsequent manufacturing processes and making the connection of cable terminals and/or anchors less critical. Said wire, strand, rope and/or cable obtained at the end of the manufacturing process can be used bare for the purposes of electrical conduction or constitute the core of insulated cables to be used in the automotive and energy sectors.

A twisted wire manufacturing method for manufacturing a twisted wire, includes hanging U-turn portions of the at least two wires on a wire hanging member, checking one end portions and the other end portions of the at least two wires, pulling up the at least two wires in a state that the U-turn portions are hung on the wire hanging member, twisting the at least two wires together after the wire pull-up step is conducted, and transferring a twist-completed wire produced by the wire twisting step to a twisted wire temporary placement hook which is disposed above the wire hanging member.

A compressed stranded conductor includes an inner layer strand having conductive wires which are twisted together, and an outer layer strand having conductive wires which are arranged around an outer periphery of the inner layer strand and are twisted together. The inner layer strand and the outer layer strand are compressed. An inner layer area reduction rate of one conductive wire of the inner layer strand is 29% or more and 32% or less. An outer layer area reduction rate of one conductive wire of the outer layer strand is 6% or more and 11% or less. A difference between the inner layer area reduction rate and the outer layer area reduction rate is 19% or more and 25% or less.

A compressed stranded conductor includes an inner layer strand having conductive wires which are twisted together, and an outer layer strand having conductive wires which are arranged around an outer periphery of the inner layer strand and are twisted together. The inner layer strand and the outer layer strand are compressed. An inner layer area reduction rate of one conductive wire of the inner layer strand is 29% or more and 32% or less. An outer layer area reduction rate of one conductive wire of the outer layer strand is 6% or more and 11% or less. A difference between the inner layer area reduction rate and the outer layer area reduction rate is 19% or more and 25% or less.

A twisted pair cabling line and method comprising, a source of at least two twisted pairs, a source of planar shield, a cabling station, that combines the twisted pairs and the shield into a non-twisted cable, a twisting station that twists the cable that is produced by the cabling station, a twisting space between the cabling station and the twisting station, in which the non-twisted cable produced by the cabling station is twisted, to thereby form the shield into a figure-8 cross section having two loops, with a twisted pair in each loop, and a cable storage station.

Provided are a core electric wire for multi-core cable that is superior in flex resistance at low temperature, and a multi-core cable employing the same. A core electric wire for multi-core cable according to an aspect of the present invention comprises a conductor obtained by twisting element wires, and an insulating layer that covers an outer periphery of the conductor, in which, in a transverse cross section of the conductor, a percentage of an area occupied by void regions among the element wires is from 5% to 20%. An average area of the conductor in the transverse cross section is preferably from 1.0 mm.sup.2 to 3.0 mm.sup.2. An average diameter of the element wires in the conductor is preferably from 40 μm to 100 μm, and the number of the element wires is preferably from 196 to 2,450. The conductor is preferably obtained by twisting stranded element wires obtained by twisting subsets of element wires. The insulating layer preferably comprises as a principal component a copolymer of ethylene and an α-olefin having a carbonyl group.

Provided are a core electric wire for multi-core cable that is superior in flex resistance at low temperature, and a multi-core cable employing the same. A core electric wire for multi-core cable according to an aspect of the present invention comprises a conductor obtained by twisting element wires, and an insulating layer that covers an outer periphery of the conductor, in which, in a transverse cross section of the conductor, a percentage of an area occupied by void regions among the element wires is from 5% to 20%. An average area of the conductor in the transverse cross section is preferably from 1.0 mm.sup.2 to 3.0 mm.sup.2. An average diameter of the element wires in the conductor is preferably from 40 μm to 100 μm, and the number of the element wires is preferably from 196 to 2,450. The conductor is preferably obtained by twisting stranded element wires obtained by twisting subsets of element wires. The insulating layer preferably comprises as a principal component a copolymer of ethylene and an α-olefin having a carbonyl group.

The present disclosure relates to a twisting system for twisting multiple conductors together. In one implementation, the twisting system may include a rotatable twisting head having multiple holders for individual conductors of a cable to be twisted, and a loading device for sequentially loading the holders with the individual conductors. The loading device may be configured to be displaced into a transfer position identical for all individual conductors for loading the twisting head, and the twisting head may be configured to rotate a free holder of the twisting head into a suitable receiving position for being loaded with an individual conductor. The present disclosure also relates to a method for loading a twisting head with individual conductors.

Systems and methods presented herein provide for elastomeric and flexible cables. In one embodiment, an elastomeric cable comprises an elastomeric core (e.g., a stretchable polymer) and at least one cabling component wound about the elastomeric core along a length of the elastomeric core.

A flex-resistant wire has a conductor portion configured as a multiple-stranded wire. The multiple-stranded wire has a plurality of bunched strands that are twisted together. Each of the bunched strands has a plurality of conductors that are twisted together. In each of the bunched strands, the lay length of the conductors that are twisted together is at least 10 times greater than a strand diameter of the bunched strand but not greater than 47.2 times the strand diameter. The lay length of the bunched strands that are twisted together is at least 5 times greater than a pitch diameter of the multiple-stranded wire but not greater than 30 times the pitch diameter. The lay length of the conductors is smaller than or equal to the lay length of the bunched strands. The flex-resistant wire may be provided as one of the wires forming a wire harness.