An electromechanical cable that is crush-resistant and torque balanced is provided as well as a method for manufacturing a crush-resistant and torque balance electromechanical cable. The cable can include a core having a conductor surrounded by a first jacket layer, a second jacket layer surrounding the first jacket layer, a first armor layer surrounding second jacket layer, a third jacket layer surrounding the first armor layer, a second armor layer surrounding the third jacket layer, and a fourth jacket layer surrounding the second armor layer. The first armor layer can be constructed as a plurality of wires and compressed partially into the second jacket layer. The second armor layer can be constructed from a plurality of three-wire strands and/or single wires and compressed partially into the third jacket layer. The three-wire strands can be symmetric or asymmetric and can be compacted or non-compacted.

An endoscope cable includes a plurality of individual cables, and is provided with an entire shield portion including a metal wire group having an electric shield function to surround entirety of the plurality of individual cables, and a cable core wire including a metal wire group in each of the individual cables. The metal wire group in at least one of the entire shield portion and the cable core wires is configured by combining a plurality of types of metal wires having different compositions from each other.

A guarded coaxial cable assembly including at least a pair of conductors, one or more rails, and a jacket covering these parts such as a first rail extending alongside two nearby conductors, the rail and the conductors embedded in an outer electrically insulating jacket, the outer jacket having a pair of generally opposed bearing surfaces for bearing transverse loads, the rail operative to reduce outer jacket deformations resulting from transverse loads applied to the bearing surfaces; and, the orientation of the rail and the conductors within the outer jacket operative to limit conductor or conductor jacket deformations resulting from transverse loads applied to the bearing surfaces.

A power cable to be provided inside a steel pipe that is electrically connected to a reference potential node, includes 3 transmission cables, 3 ground buses making contact with outer peripheral surfaces of adjacent transmission cables and arranged at 3-fold rotationally symmetrical positions with respect to a center of the transmission cables in a cross sectional view, a binder covering the ground buses and the transmission cables, and a jacket provided to overlap the binder. The transmission cables have outer diameters to inscribe a first circle having a radius corresponding to a radius of a second, envelope circle of the power cable having a maximum radius inside the steel pipe, but excluding thicknesses of the binder and the jacket. The ground buses have outer diameters to project outwardly of an envelope closed curve of the transmission cables, but less than or equal to a diameter of the first circle.

A power cable to be provided inside a steel pipe that is electrically connected to a reference potential node, includes 3 transmission cables, 3 ground buses making contact with outer peripheral surfaces of adjacent transmission cables and arranged at 3-fold rotationally symmetrical positions with respect to a center of the transmission cables in a cross sectional view, a binder covering the ground buses and the transmission cables, and a jacket provided to overlap the binder. The transmission cables have outer diameters to inscribe a first circle having a radius corresponding to a radius of a second, envelope circle of the power cable having a maximum radius inside the steel pipe, but excluding thicknesses of the binder and the jacket. The ground buses have outer diameters to project outwardly of an envelope closed curve of the transmission cables, but less than or equal to a diameter of the first circle.

An electric power transmission cable, comprising: at least a first portion provided with a plurality of first armouring wires having a first tensile strength, said plurality of first armouring wires being made of a first metallic material coated with a first metallic protection coating with a thickness more than 100 g/m.sup.2 said first metallic material having a first magnetic permeability 1, at least a second portion provided with a plurality of second armouring wires having a second tensile strength, said plurality of second armouring wires being made of a second metallic material coated with a second metallic protection coating with a thickness more than 100 g/m.sup.2, said second metallic material having a second magnetic permeability 2, and 21, each of said plurality of first armouring wires being longitudinally joined to one of said plurality of second armouring wires at a joint portion, said joint portion having a third tensile strength, wherein the third tensile strength is at least more than 80% of the lower tensile strength of the first tensile strength and the second tensile strength.

A non-magnetic stainless steel wire with an adherent corrosion resistant coating is disclosed. The surface of the non-magnetic stainless steel is pre-treated so as to be sufficiently free from oxides and form a good adhesion with the above corrosion resistant coating. The non-magnetic stainless steel wire is used as a armoring wire for a power cable for transmitting electrical power.

The invention provides an ultra-flexible indoor accompanying photoelectric composite cable, and the cable comprises a plurality of power transmission components, optical fiber transmission components and structural strengthening components, which are covered by a highly flame-retardant outer protective layer. The power transmission component comprises a cable core which is a soft conductor and an insulating material layer wrapped around the cable core. The optical fiber transmission component is a tight tube optical fiber, and the power transmission components and the optical fiber transmission components are arranged in parallel inside the highly flame-retardant outer protective layer. The composite cable of the invention has very strong pressure resistance, stress resistance, and reciprocating resistance, good electrical and physical properties and more excellent environment resistant performance. Furthermore, the composite cable can simplify construction procedures, improve working efficiency and reduce construction cost.

A guarded coaxial cable assembly including at least a pair of conductors, one or more rails, and a jacket covering these parts.

An electromechanical cable that is crush-resistant and torque balanced is provided as well as a method for manufacturing a crush-resistant and torque balance electromechanical cable. The cable can include a core having a conductor surrounded by a first jacket layer, a second jacket layer surrounding the first jacket layer, a first armor layer surrounding second jacket layer, a third jacket layer surrounding the first armor layer, a second armor layer surrounding the third jacket layer, and a fourth jacket layer surrounding the second armor layer. The first armor layer can be constructed as a plurality of wires and compressed partially into the second jacket layer. The second armor layer can be constructed from a plurality of three-wire strands and/or single wires and compressed partially into the third jacket layer. The three-wire strands can be symmetric or asymmetric and can be compacted or non-compacted.