A differential transmission cable and a wire harness is provided. The differential transmission cable 1 includes two electric wires, a non-conductive film that is wound around the two electric wires, and a sheath that is brought into contact with the periphery of the film in a filled state. The film has an adhesive layer in one surface of the film. The film is wound around the two electric wires such that the adhesive layer is arranged outside. In addition, the film is laterally wound around the two electric wires.

A fireproof cable which has a ceramified silicone rubber insulating sheath and a stainless steel interlocked armor. The cable includes wire cores each having multiple flexible copper conductors, wherein each conductor is wrapped with a ceramified silicone rubber insulating layer. A ceramified silicone rubber sheath layer and a stainless steel interlocked armor protection layer are wrapped around the wire core successively.

A method for forming magnet wire with improved partial discharge performance may include providing a conductor, forming a first layer of polymeric enamel insulation formed around the conductor, and forming a second semi-conductive layer around the first layer. Forming the second layer may include providing a base polyamic acid and complexing filler particles with the base polyamic acid. The polyamic acid may be applied around the first layer, and the filler particles may migrate towards an outer surface of the second layer. The polyamic acid may be cured to form a semi-conductive enamel layer, and at least sixty percent by weight of the filler particles may be positioned within an outer half of the second layer following the migration.

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 m to 100 m, 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 -olefin having a carbonyl group.

A cable includes at least one core that has a conductor and an insulating coating layer that covers the conductor; and a sheath layer that covers the at least one core. The sheath layer includes an inner sheath layer and an outer sheath layer that covers the inner sheath layer. The inner sheath layer contains a silane-crosslinked very low density polyethylene. A main component of the outer sheath layer is polyurethane; a content of the very low density polyethylene per 100 parts by mass of a resin component in the inner sheath layer is 20 parts by mass or more and 100 parts by mass or less. A content of silicon atoms constituting silane crosslinks in the very low density polyethylene is 0.05 mass % or more and 1 mass % or less.

The present invention relates to a submarine cable having a bimetallic armor. In particular, the present invention relates to a submarine cable capable of effectively suppressing damage to and corrosion of an armor formed of different types of metals due to a local decrease in tensile strength thereof and capable of avoiding an increase in an external diameter of the cable, the structural instability of the cable, and damage to the cable during the manufacture and installation thereof.

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 m to 100 m, 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 -olefin having a carbonyl group.

A shielded electrical cable includes one or more conductor sets extending along a length of the cable and being spaced apart from each other along a width of the cable. Each conductor set has one or more conductors having a size no greater than 24 AWG and each conductor set has an insertion loss of less than about ?20 dB/meter over a frequency range of 0 to 20 GHz. First and second shielding films are disposed on opposite sides of the cable, the first and second films including cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the first and second films in combination substantially surround each conductor set, and the pinched portions of the first and second films in combination form pinched portions of the cable on each side of each conductor.

An insulated wire, containing: a conductor having a rectangular cross-section; and an insulating coated film having at least two insulating layers laminated together on the conductor,
wherein the laminated insulating coated film is composed of: an enamel insulating layer formed from a thermosetting resin on the outer periphery of the conductor, and an extruded insulating layer formed from a thermoplastic resin on the outer side of the enamel insulating layer,
wherein the thickness of the enamel insulating layer is 50 m or more, and wherein the total thickness (T) and the relative permittivity () at 100 C. of the laminated insulating coated film; and the maximum thickness (Tmax), and the maximum value (max) and the minimum value (min) of the relative permittivity at 100 C. of one layer among the laminated insulating layers; satisfy all of the following relations:

T100 m (1.1)

Tmax100 m (1.2)

1.53.5 (2.1)

1.0max/min1.2 (2.2) a coil; and an electrical or electronic equipment.

The current invention is a heated extension cord. The cord will function like a standard extension cord, allowing a user to use electrical devices in areas without an electrical outlet. The cord will have multiple layers. The cord will have a heated wires layer. The heated wires keeps the insulation from freezing, and ensures the electrical wire stays warm enough to function efficiently. Outside the heated wires are two layers of insulation, one to insulate the heated wires themselves and an outer layer that can directly withstand freezing temperatures. The extension cord has an indicator light and an on/off switch for the heated wires.