Abstract: An electrical line for installation in a well for transmitting power to a well pump includes a string of coiled tubing. An electrical cable having insulated electrical conductors embedded within an elastomeric jacket extends longitudinally through the interior passage of the tubing. Retainers are mounted to the electrical cable and spaced longitudinally apart from each other. An indentation is integrally formed in the tubing adjacent each of the retainers. Each indentation protrudes into the interior passage of the tubing and creates a ledge which is contacted by one of the retainers when the electrical line is installed in the well. The indentations and retainers transfer weight of the electrical cable to the tubing. Weld material is filled into the depression on the surface created by each indentation.

Abstract: A high speed data transmission cable comprises a pair of primary cables positioned adjacent to each other along their lengths with each primary cable including a pair of generally parallel conductors coupled together and surrounded by insulation. A shield layer surrounds each primary cable along its length to isolate the primary cables from each other. The primary cables and corresponding shield layers are twisted together around a center axis and form a double helical structure, thereby providing improved transmission characteristics in the high speed data transmission cable.

Abstract: One or more specific wires is placed at the middle of the wire harness cross section with double-sided adhesive tape between the specific wires and the other wires surrounding these core wires. One side of the double-sided adhesive tape adheres to these core wires while the other side adheres to the other wires surrounding the core wires. The double-sided adhesive tape thus positions and holds both the selected core wires and the surrounding other wires. A single-sided adhesive tape can be also used.

Abstract: An electrical power cable includes a central ground conductor surrounded by an insulating material layer. An inner grounded shield is formed on the surface of the ground conductor or between the ground conductor and line and neutral conductors. A plurality of insulated line conductors and a plurality of insulated neutral conductors are circumferentially disposed in an annular arrangement about an insulation layer on the inner shield. The plurality of line and neutral conductors are each disposed circumferentially side-by-side in separate groups of line and neutral conductors. The total cross-sectional area of each group of line conductors and neutral conductors is substantially equal to the total cross-sectional area of a single large conductor of equivalent ampere rating. An outer shield is disposed about the line and neutral conductors and covered by an outer insulating layer.

Abstract: A noise-suppressing, coil-type, electrical cable which is resistant to high voltage includes an elongated core and a helically wound resistance wire. An insulation layer is provided over the resistance wire on the core. The wire has a tensile strength of at least 100 grams force, an elongation to break of at least 15%, a diameter between about 45 and 70 .mu.m, and a resistivity of approximately 10 to 50 .mu..OMEGA..multidot.cm. There are at least 7,000 turns per meter of the wire wound around the core, and the cable has a resistance value of approximately 2 to 4 .OMEGA.k/m. Cables of the foregoing type provide reduced resistance and maintain their ability to suppress noise.

Abstract: An electrical line for a well pump has elastomeric supports clamped to the exterior of electrical cable for supporting the cable within coiled tubing. The cable supports have an elastomeric member that swells when contacted with a hydrocarbon liquid. Each expansion member is clamped to the cable exterior by retainers located at the ends. The expansion members are spaced apart longitudinally along the cable, and then the cable is inserted into the coiled tubing. Hydrocarbon liquid is pumped through the coiled tubing to cause the expansion members to swell into frictional engagement with the coiled tubing. The retainers direct the swelling laterally into tight contact with the coiled tubing.

Abstract: System neutral to earth grounding, over the entire length of an electrical cable is achieved by adding one or more strips of semi-conductive material over the helically or otherwise wound concentric neutral conductors and completing the cable jacket with insulating material. The strip engages the soil when buried to provide a continuous ground path for the neutral conductors. In a second form protrusions of semi-conductive material project from a semi-conductive layer and encircle certain of the neutral conductors while the remainder are partially surrounded by the semi-conductive layer. Insulating material segments complete the cable jacket. The free ends of the protrusions engage the soil about the cable to provide a continuous ground for the neutral conductors helically wound or extending in parallel with the cable longitudinal axis.

Abstract: A reinforced coaxial cable for underground service is disclosed. The cable generally includes an elongate center conductor, a surrounding dielectric material such as a foamed polymer dielectric, an outer conductor, a first jacket, an intermediate protective layer, and a second jacket. A ripcord can be positioned longitudinally between the first jacket and the intermediate protective layer to facilitate removal of both the intermediate protective layer and the second jacket. A tracer, or other visible indicia, extends longitudinally along the outer surface of the second jacket to facilitate locating the underlying ripcord. The intermediate layer and the second jacket provide increased impact resistance, cut-through resistance, and compressive strength, as well as increased resistance to abrasion and other frictionally induced damage. In addition, the intermediate layer and second jacket can be readily removed to allow increased flexibility or connectorization of the cable.

Abstract: A cable assembly is described, which includes a bundle of wires (14, FIG. 1) and a shield structure (24) around them which is of light weight for aircraft applications, and which provides effective shielding especially against electromagnetic interference. The shield structure includes a metal braiding (32) sandwiched between radially outer and inner shrink tubes (34, 30), with each shrink tube having an electrically conductive coating (42, 40) in contact with the metal braiding. The inner shrink tube, which has a conductive coating on its outside surface, is initially shrunk around the bundle of wires to stabilize their positions. The tubular wire braiding is installed around the inner shrink tube and the outer shrink tube which has a conductive coating on its radially inner surface, is placed around the braiding. Then, the outer shrink is tube is heat shrunk in place. Sandwiching the wire braiding between two metal coatings provides enhanced interference protection.

Abstract: A shielded electric cable having a core including an insulated conductor. A first shielding member formed of an elongated ribbon of insulating material and a pair of elongated metal foil strips arranged in a parallel relationship with the ribbon and bonded to the opposite sides of the ribbon is applied longitudinally to the core and wrapped circumferentially therearound forming two concentric substantially closed shielded layers. A layer of plastic material, preferably foamed, surrounds the first shielding member and a second shielding member surrounds the plastic layer, the second shielding member being formed of non-braided metallic material. The layer of plastic material is bonded to the shielding members. The shielded electric cable is provided with an outer jacket of non-conducting material and having an appropriate O.D. for receiving a standard connector.

Abstract: A cable is provided that is suitable for Kelvin connection and a measuring system for using the cable. The cable comprises a central conductor for current supply to an object to be measured, a voltage detection conductor insulated and located close to the central conductor, a tubular guarding conductor surrounding the above two conductors covered by insulating material and a tubular conductor for a reference potential surrounding the above-mentioned conductors (as covered by an insulating material).

Abstract: A flexible multi-parameter conductor cable having coaxially symmetric elongated zones for signal carrying conductor placement therein, comprising an electrically conductive inner shield defining an electrically shielded inner longitudinal zone symmetrically disposed along and defining a center of said cable for containing at least one of a first type of signal carrying conductor, and an electrically conductive outer shield spaced a given distance symmetrically around said inner shield so as to define an electrically shielded outer longitudinal zone symmetrically disposed about said inner longitudinal zone for containing a plurality of at least a second type of signal carrying insulated conductor arranged in a single layer adjacent one another in said second longitudinal zone, said second type of conductor having an electrically conductive outer jacket in electrical contact with at least said outer shield.

Abstract: A dual push-cable for mechanically and electrically connecting a video camera head to a video circuit to permit the head to be pushed down the inside a pipe and negotiate turns in the pipe as the push cable is forced down the pipe while permitting the video circuit to power and receive video signals from the video camera head. The push-cable comprises an elongate resilient flexible push member, and elongate electrical and/or fiber optic signal transmitting cable, and a hinge joining the push member and the signal transmitting cable in a substantially parallel spaced apart side-by-side relationship. The push member may be a cylindrical rod formed of fiberglass impregnated with epoxy resin. The electrical signal transmitting cable may be armored tri-axial cable.

Abstract: A shielded electric cable having a core including an insulated conductor. A first shielding member formed of an elongated ribbon of insulating material and a pair of elongated metal foil strips arranged in a parallel relationship with the ribbon and bonded to the opposite sides of the ribbon is applied longitudinally to the core and wrapped circumferentially therearound forming two concentric substantially closed shielded layers. A layer of plastic material, preferably foamed, surrounds the first shielding member and a second shielding member surrounds the plastic layer, the second shielding member being formed of non-braided metallic material. The layer of plastic material is bonded to the shielding members. The shielded electric cable is provided with an outer jacket of non-conducting material and having an appropriate O.D. for receiving a standard connector.

Abstract: The present invention relates to a cable used to supply electric power to a pump for pumping crude oil from an oil well. It is consisted of an insulating layer, a resin sheath and a metallic sheath sequentially layered onto the surface of a conductor. A protective layer comprised by a wrapping of thermal resistant tape is formed at the surface of at least one of the insulating layer and the resin sheath. Due to the provision of this protective layer, it is possible to prevent the breakdown of the insulating layer and the formation of holes in the cable caused by pressure changes occurring when the cable is removed from an oil well within the high pressure environment.

Abstract: An electrical system comprises an inverter, a three-phase electric motor and a cable to transfer energy from the inverter to the motor. The cable further comprises a center conductor and two additional conductors disposed about the center conductor. Insulators physically and electrically separate the conductors from one another. Electromagnetic emissions from the cable are substantially prevented due to the construction of the cable.

Abstract: An electrical shielding jacket has a first shield formed from a wire mesh strip and a second shield formed from a flexible film bearing a metal coating. The jacket has a flexible casing which is closable by means of a zipper.

Abstract: In known cables, the cable core is surrounded by a metallic inner layer of a sheath, and the inner layer is enclosed by a corrugated metallic outer layer of the sheath. In these cables, a high resistance against corrosion and high temperatures at a good shielding of the electric conductors is not ensured.The new cable (1) including the inner sheath layer (19) which is made of at least one flexible copper band (11) and defined by an electromagnetic shielding with a shielding attenuation from 80 to 115 dB, with the shield attenuation in this range being dependent from the wall thickness of the inner layer and rising monotonously with increasing wall thickness, and the outer sheath layer (27) which is made of a steel band and increases the high temperature resistance of the cable 1, has the advantages of a good temperature resistance even at high ambient temperatures, like e.g. in case of fire, and a high resistance with regard to corrosion.

Abstract: Insulatedly coated wires (10) each coated with a metal foil of good electric conductivity and a metal foil of high magnetic permeability to form an electrostatic shielding layer (20) and a magnetic shielding layer (30), are bundled and are connected at their opposite ends to connectors. Each wire is adapted to be shielded with the metal foils in place of the conventional braided tube, thereby providing an easy-to-manufacture wire harness having good shielding effects adjacent the connectors.

Abstract: A shielded electric cable having a core including an insulated conductor. A first shielding member formed of an elongated ribbon of insulating material and a pair of elongated metal foil strips arranged in a parallel relationship with the ribbon and bonded to the opposite sides of the ribbon is applied longitudinally to the core and wrapped circumferentially therearound forming two concentric substantially closed shielded layers. A layer of foam material surrounds the first shielding member and a second shielding member surrounds the foam layer, the second shielding member being formed of non-braided metallic material. The shielded electric cable is provided with an outer jacket of non-conducting material and having an appropriate O.D. for receiving a standard connector.

Abstract: A coated wire is provided which comprises a wire coated with a blend of polyarylene sulfide and an ungrafted, hydrogenated conjugated diene/vinyl aromatic block copolymer which imparts improved elongation to polyarylene sulfide.

Abstract: A coaxial audio cable is provided having a core, braided inner and outer conductors, dielectric layer between the inner and outer conductor and a jacket surrounding the outer conductor. The inner conductor is disposed around the core at a braid angle of approximately eighteen degrees. The dielectric layer is wrapped around the braided inner conductor. The outer conductor is disposed around the dielectric layer at a braid angle of approximately thirty-eight degrees. The cable is designed to provide a 5:6 overall ratio between the number of strands in the inner conductor and the number of strands in the outer conductor. The inner and outer conductors of the coaxial audio cable are designed to have matching series impedances.

Abstract: In one embodiment of an electrical cable, a high resistivity inner shield surrounds and is insulated from a central conductor within the electrical cable. The inner shield is surrounded by, and optionally insulated from, an outer, highly conductive shield. This approach may be thought of as shielding the interior central conductor from the outside highly conductive metal shield. The inner shield attenuates the effects of fluctuating voltage gradients in the outer shield on the central conductor.This technique of an inner shield shielding an interior electrical conductor may also be employed in cabinets for electronic equipment.

Abstract: A low loss coaxial cable has a central supporting rod of plastic, covered in metal and forming the inner conductor or core of the coaxial cable. An intermediate insulation made of a dielectric material surrounds the inner conductor and an outer metal conductor surrounds the intermediate insulation. The central rod is made of polytetrafluoroethylene (PTFE) having a relative density greater than or equal to 1.6. The intermediate insulation has a relative density less than 1.2 and the ratio of the density of the dielectric constituting the intermediate insulation divided by the density of the PTFE constituting the rod lies in the range of 0.15 to 0.75.

Abstract: An electrical cable assembly (10) comprising a cable core (12) and filler layer (16) encased in longitudinally welded reeled tubing (23) so as to restrict relative axial and longitudinal motion between the cable core (12) and reeled tubing (23). Small-diameter tubing (24) is optionally provided as part of the cable core (12) to facilitate the delivery of fluids such as lubricants and corrosion inhibitors to downhole equipment. A method is disclosed for deploying electrical cables in deep wells through use of the subject apparatus.

Abstract: A multi-conductor hybrid cable construction includes a plurality of inner signal conductors. A unitary dielectric member surrounds, insulates, spaces and joins the inner signal conductors in a circular array about the axis of the cable. An inner conductive shield is disposed about the unitary dielectric member and the surrounded inner conductors. A plurality of outer data conductors are arranged circumferentially about the inner conductive shield. An outer conductive shield is disposed about the outer data conductors. A central dielectric filler is disposed inside the unitary dielectric member, and an insulating jacket is disposed about the outer conductive shield forming the outside of the cable.

Abstract: A crush, kink, and torque resistant, flexible coaxial cable having a closely spaced, spiralled rigid metal wire layer between the outer conductor of the coaxial transmission line and the outer jacket of the cable. Small size light weight, good flexibility with minimum spring-back and excellent crush resistance are provided together with excellent kinking, and torque resistance. This eliminates the need for external ruggedization to protect the electrical properties of the cable.

Abstract: A cable interconnection for an audio component system includes a first cable and a second cable. The first cable has a pair of first conductors, each of the first conductors are adapted to make an electrical connection between a source positive terminal and a load positive terminal of a signal source and load, respectively. The second cable has a trio of second conductors. A first one and a second one of the trio of second conductors, are each adapted to make an electrical connection between a source negative terminal and a load negative terminal of the source and load. A third one of the trio of second conductors is adapted to be coupled electrically only to the load negative terminal. The third one of the second conductors extends substantially the full length of the second cable. A rheostat may be provided to be coupled electrically in series between the third one of the second conductors and the load negative terminal.

Abstract: A shielding tape particularly designed for CATV cable in which a single conductor is surrounded by insulation which is in turn wrapped by the tape comprises a laminate base tape of a conducting foil and a non-conducting plastic film. The base tape is folded along two fold lines spaced by slightly less than half the width of the base tape with the foil outermost at each of the folds and the edges of the base tape overlapping. A bonding layer can be applied on the side of the folded tape with the overlapping edges. An additional narrow J-fold can be applied along one edge to provide additional contact between the foil at the overlap. The continuous extent of the foil around the full periphery of the tape provides an improved "slot free" shielding effect.

Abstract: An electrical transmission line has improved signal transmission characteristics, low attenuation, constant phase and group velocity and constant and nearly ohmic characteristic impedance over a wide frequency band by providing low magnetic loss inductance along with the shunt capacitance of the insulation surrounding the conductors. The low loss inductance can be provided by particulate magnetic material, such as ferrites, homogeneously distributed in the insulating material or alternatively the inductance can be provided by ring(s) of magnetic material concentric with the conductor or by layer(s) of magnetic material when the conductor(s) are flat. A variety of radial or longitudinal profiles of the doping level is possible and can be used in combination with any of these basic loading designs. These concepts can be applied in twisted pair, coaxial or high voltage power transmission and distribution single or three phase cables or strip lines and other breadboard applications.

Abstract: The invention relates to a flame-resistant electric line having a conductor (1) which is surrounded by an insulation (2) over which there is a shielding (3). A ribbon (4) consisting of a glass cloth provided with a metal layer on one side is wound in overlapping manner over the shielding (3). The metal layer is on the outside in the line. The width (B) of the overlap is between 7% and 35% of the width of the ribbon (4). A sheathing (5) of insulating material is arranged over the ribbon (4).

Abstract: A self-supporting power cable which is especially useful in seismic testing. The cable includes an outer armor layer, a pair of tensile elements located inside the armor layer, a power conveying assembly located inside the armor layer and between the tensile elements, and filler material filling the otherwise empty spaces within the armor layer. The tensile elements are advantageously formed of several concentric layers of spirally-wrapped wire strands with at least the outer layer having less than a full contingent of strands. This improves the cable's strength-to-weight ratio while providing self support. To provide transverse force resistance against the cleats of a feeding device, the outer layer of the wire ropes contact the walls of the outer armor layer.

Abstract: A lead sheathed power cable especially useful for powering electric submersible pumps in brine wells. The cable is easy to grip and support and resists damage during flexing and chemical attack. The cable comprises at least one power conduit, vulcanized filler material enclosing the power conduit, a lead tube enclosing the filler material, a spacer assembly enclosing the tube, and an outer armor sheath. The armor sheath has a helically grooved inner surface which is interfitted with a conforming helically grooved outer surface on the malleable tube. The outer surface on the tube is helically grooved during initial heating of the cable, which vulcanizes and thermally outwardly expands the filler material and outwardly expands the tube so that the groove on the armor sheath is impressed into the tube.

Abstract: A shielded electrical cable includes a central conductor wire, a dielectric core over the conductor wire, a metallic foil shielding tape over the dielectric core and an insulated outer jacket over the shielding tape. The shielding tape is wrapped on the dielectric core so that one edge portion of the tape overlaps the opposite edge portion thereof, and it includes a metallic layer and a waterproof adhesive layer on the inner side of the metallic layer. The adhesive layer extends over only preselected portions of the inner side of the metallic layer in the overlapping edge portion of the tape so that a plurality of spaced contact pads are provided on the inner side of the tape wherein the metallic layer is exposed. The adhesive layer bonds and seals the overlapping edge portions of the tape together, and metal-to-metal contact is effected between the inner and outer sides of the metallic layer in the contact pads to reduce radiation leakage between the overlapping edge portions of the tape.

Abstract: A multi-layered adhesive composition particularly suited for adhesion between metallic substrates and vinyl chloride polymer resins particularly highly plasticized vinyl chloride polymer resins comprising a metal adherent layer, an intermediate layer and a vinyl chloride polymer adherent layer.

Abstract: The cable shielding tape of this invention comprises a metal foil layer and a polymer supporting layer fusibly bonded directly to the aluminum foil layer and serving to structurally reinforce the foil layer. The polymer supporting layer comprises a polymer blend of a polyolefin component and an elastomeric component.

Abstract: A gas-tight and moisture-tight, mechanically strong signal transmission cable having a cable core and a cable sheath which comprises a metal tape folded around the core and having a minimum thickness of 100 .mu.m, a layer of polyethylene adhering to the tape, a layer of polyamide-11 or polyamide-12, an armoring of reinforcing wires or tapes, and a synthetic resin outer sheath.

Abstract: A concentric three-conductor cable includes an inner conductor and outer conductors formed of braided strands, and insulating material separating the outer conductors from each other and from the inner conductor, each the other conductors being formed of a plurality of layers and the d-c resistance of the outer conductors being several times smaller than the d-c resistance of said inner conductor.

Abstract: A two-pole ruggedized optical fiber cable suitable for use in communication applications is described. The cable has a core assembly comprising a sealed inner copper alloy tube in which at least one optical fiber is encapsulated. Surrounding the core assembly is a layer of dielectric material, an outer metallic tube and, if needed, a protective jacket. The outer tube's primary function is to serve as the cable's primary strength member. The outer tube is preferably formed from a high strength, non-ferrous alloy having a relatively low modulus of elasticity. The outer tube is preferably a drawn tube having a substantially straight axial seam. If added hermeticity is required, the outer tube seam may be sealed. A process and apparatus for fabricating the cable is also described.

Abstract: A bonded ASP cable includes a multiconductor core which is filled with a waterproofing material. The core is enclosed by a plastic layer (28) which is flooded with a waterproofing material. Wrapped longitudinally about the plastic layer is a corrugated inner shield (31) having a longitudinal seam (35) and having an outer surface covered with a waterproofing material. The inner shield is enclosed by a corrugated outer shield (36) which has an overlapped longitudinal seam (38) and which has an outer surface coated with a layer of an adhesive material. As the outer shield is being formed, a sealant material is introduced into engagement with the inner shield in the vicinity of the longitudinal edge portions of the outer shield. Then as the longitudinal edge portions of the outer shield are overlapped and engaged with each other, the sealant material is caused to flow into cavities between the two shields adjacent to the seam of the outer shield to form a gasket (66).

Abstract: An electrical coaxial cable is disclosed herein including an inner conductor and a concentric outer conductor electrically insulated from one another by means of a layer of dielectric material disposed therebetween. A series of concentric layers of electrically conductive polymer material serve to shield the insulation layer from the inner and outer conductors and also divide the insulation layer into individual concentric segments.

Abstract: Methods and apparatus are provided for making a laminate which is used to form a corrugated outer shield (60) of a sheath system (50) for a lightguide fiber cable (20). A strip (81) of a corrosion-resistant metallic material having a relatively high elongation, an oxide surface layer (65) and a relatively coarse outer surface is preheated to a temperature within a predetermined range. Afterwards, a composite adhesive strip is brought into engagement with the metallic strip and moved between a pair of rollers (91--91) which are maintained at a first temperature and which causes the strips to be subjected to a predetermined pressure. Then the two strips are moved between another pair of rollers (97--97) which are at a second temperature greater than the first and which subject the strips to the predetermined pressure. The resulting laminate (61) is corrugated by a device (104) and formed into the outer shield (60) about an inner shield (51) which is made of a highly conductive metallic material.

Abstract: A strip (56) of non-metallic material and one (59) of a metallic material are wrapped simultaneously about an advancing cable core (32) to enclose partially the core. Then longitudinal edge portions (71, 72) of the strip of non-metallic material are separated by a shoe (150) which permits movement of the edge portions in a direction circumferentially of the core. One longitudinal edge portion (72) of the non-metallic strip becomes confined in a guideway (118) of a tool (99) and longitudinal edge portions (73, 74) of the metallic strip (59) are guided along guideways (117, 118) of the tool as the strips are moved through a converging passageway (103). This controls the relative circumferential movement between the edge portions as the strips are moved through the passageway to form a core wrap (33) and a shield (34).

Abstract: An electrical cable includes a core, a jacket and improved shielding with unexpectably low transfer impedance. The shielding includes an inner foil laminate, a braided sleeve, and an outer foil laminate, each foil laminate having at least one conductive layer and at least one strength-giving non-conductive layer. At least one of the foils includes a shorting fold to limit the slot effect. Preferably, the inner foil has two conductive layers, and the outer foil has the shorting fold.

Abstract: A fully shielded flexible ribbon cable having transmission line electrical characteristics and flexible ribbon cable mechanical characteristics capable of easy mass termination. The cable has a plurality of circular uniformly spaced signal conductors lying in a single plane encased in insulation having an effectively uniform dielectric constant of not more than 3.0. A sheet conductor is bonded to the insulation providing both transverse and longitudinal electrical continuity. The ratio of the diameter of the signal conductors to the distance between centers of the signal conductors is between 0.16 and 0.42. The ratio between the thickness of the cable at the inner surface of the sheet conductor to the distance between centers of the signal conductors is not more than 1.5.

Abstract: A self-supporting aerial cable includes an undulated core enclosed in an aluminum, inner shield, a plastic inner jacket enclosed in a steel, outer shield having an unjoined longitudinal overlapped seam, and a plastic outer jacket. The outer plastic jacket includes a first portion which encloses the steel shield and a second portion which encloses a steel support strand that extends longitudinally but which is spaced from the first portion, said first and second portions of the outer jacket being connected by a web. The unjoined seam of the outer shield allows forces which are imparted to the steel shield by its formation to be transferred to the inner jacket and the inner shield which causes the inner shield to engage portions of the core to maintain the core coextensive with the inner and the outer jackets.

Abstract: A cable for prospecting, said cable including a core of conductor wires (3) surrounded by insulating material (4) and by armour (7, 8) formed by at least one layer of helically wound steel wires. It includes, from its center to its periphery, inside the armour, an axial monofilament (2) made of a polymer that withstands high temperatures, said monofilament forming the insulation of an inner conductor (1), an outer conductor (5) and a sheath (6) made of a thermoplastic substance that withstands high temperatures, said inner conductor serving a different electrical function than said core of conductor wires.

Abstract: The subject invention is directed to a cable comprising at least one center conductor, a dielectric surrounding said conductor and a plurality of metallic sheaths with at least two of said metallic sheaths separated, having a high series impedance and high propagation function for the path between said separated metallic sheaths. Said metallic sheaths are disposed in coaxial relationship to said at least one center conductor along the length of said cable. The cable design improves the shielding, suppression of EMI and RFI interference and minimizes the number and/or cost of the metallic sheaths required to obtain desired shielding.

Abstract: Improved shielding members and electric cable constructions which utilize these shielding members are described. Various configurations of the shielding members can be used to enclose a single cable circuit consisting of one or more conductors in two concentric metallic shielding layers fabricated from a single shielding member which provides excellent electrical isolation for the cable circuit. Generally, the shielding members comprise an elongated ribbon of insulating material and a pair of elongated foil strips arranged in parallel relationship with the ribbon. The foil strips are bonded to opposite sides of the ribbon and each has an elongated edge generally in alignment with opposite elongated edges of the ribbon. The selective use of layers of heat sensitive sealing material for sealing the shielding layers protects the cable circuits from moisture.

Abstract: A multi-core power cable (1) in which the conductors comprise a central conductor (2) and two or more tubular conductors (4, 6) coaxial with the central conductor (2), at least the tubular conductors forming the cores. The conductors (2, 4, 6) are isolated from one another by insulating layers (3, 5, 7). A sheath (8) and armoring (9, 10) may also be provided.