Abstract: A communications cable having superior electrical characteristics and meeting the burn requirements for plenum applications has a core formed of one or more twisted wire pairs having primary insulation formed of a suitable material, such as high density polyethylene. The core is surrounded by a single outer jacket formed from a material having excellent heat/flame resistance characteristics and acceptable electrical characteristics that are substantially stable at relatively high temperatures, such as a foamed thermoplastic halogenated polymer, for example polyvinylidene fluoride material. The electrical conductors utilized by the cable are oversized (relative to conventional 24 gauge conductors) to enhance the electrical performance of the cable. An air gap formed between the conductor core and the outer jacket further enhances the electrical performance of the cable.

Abstract: An electronic enclosure includes at least one wall coated with an intumescent fire retardant paint to prevent the spread of flame through the enclosure. The enclosure includes a wall having a plurality of apertures for allowing air to flow through the enclosure. The wall and the apertures are coated with intumescent fire retardant paint to constrict the apertures when the wall is subjected to elevated temperatures due to fire, to thereby minimize the flow of air through the apertures and prevent the spread of flame through the wall.

Abstract: The invention provides a water-blocking composite comprising a substrate impregnated with or having a coating of a mixture of a radiation-polymerised compound and a water-swellable compound, and method for production thereof.

Abstract: An electrical cable is disclosed in which at least two pairs of insulated conductors are bound by a substantially circular jacket. The conductors in one of the pairs are twisted or rotated about one another in a spiral pattern at a frequency corresponding to a first twist lay or length. The conductors in a second pair are also twisted about one another at a frequency corresponding to a second twist lay. Finally, the two pairs of conductors are stranded about one another at a frequency corresponding to a strand lay. The substantially circular jacket resists the tendency to jam cable processing machines (e.g., a connectorization machine) when being dispensed from a pay-off reel, which is a common problem in prior art patch cord designs. As a result, the cable reduces manufacturing costs. In addition, the cable provides improved electrical performance, as measured by several performance standards, over prior art cable designs.

Abstract: The present invention is directed to an improvement in a wire or cable system comprising a wire or cable portion, an insulation composition surrounding the wire or cable portion, a filler material surrounding the insulation composition and a jacket composition surrounding the filler material wherein either the insulation composition, the jacket composition, or both comprise at least one antioxidant, wherein the improvement comprises the inclusion in the filler material of a stabilizing mixture comprising at least two antioxidants, selected from at least two members of the group consisting of:(a) metal dithiocarbamate salts,(b) amine antioxidants, and(c) sterically hindered phenolic antioxidants,wherein the stabilizing mixture is present in the filler material in an amount that is effective for the reduction of the oxidation of the cable filling material, thereby reducing deterioration of the jacket and/or insulation.

Abstract: A communications cable having superior electrical characteristics and meeting the burn requirements for plenum applications has a core formed of one or more twisted wire pairs having primary insulation formed of a suitable material, such as high density polyethylene. The core is surrounded by a single outer jacket formed from a material having excellent heat/flame resistance characteristics and acceptable electrical characteristics that are substantially stable at relatively high temperatures, such as a foamed thermoplastic halogenated polymer, for example polyvinylidene fluoride material. The electrical conductors utilized by the cable are oversized (relative to conventional 24 gauge conductors) to enhance the electrical performance of the cable. An air gap formed between the conductor core and the outer jacket further enhances the electrical performance of the cable.

Abstract: An apparatus for reducing electromagnetic interference associated with a signal-conducting cable includes a ferrite bead and a one-piece molded encasement covering the ferrite bead. The encasement includes a number of ribs located within a longitudinal aperture of the ferrite bead. The ribs protrude radially inward to secure the apparatus to the cable and to coaxially align the cable within the aperture. In a preferred embodiment, the encasement and ribs are integrally formed from a resilient material.

Abstract: The present invention provides a fully water blocked coaxial cable. In one preferred embodiment, the cable includes at least one metallic inner conductor and a dielectric material surrounding the inner conductor or conductors. A first metallic shield tape surrounds the dielectric material and the conductor or conductors. A first braided metallic shield surrounds the first metallic shield tape, and a second metallic shield tape surrounds the first braided shield. A water swellable flooding material is disposed between the first and second metallic shield tapes. A second braided metallic shield surrounds the second metallic shield tape, and a jacket surrounds the second braided metallic shield. In one preferred form of the invention, the water swellable flooding material includes at least one water swellable strand disposed between the first and second metallic shield tapes. More particularly, the water swellable strand may include a yarn having a coating of a water swellable hydrophilic material.

Abstract: A communication cable includes a first plurality of twisted pairs of electrical conductors, wherein each electrical conductor is surrounded by a layer of plenum rated insulation. The cable also includes a second plurality of twisted pairs of electrical conductors, wherein one conductor of each pair is surrounded by a layer of plenum rated insulation and the other electrical conductor is surrounded by a layer of non-plenum rated insulation. In an alternate embodiment, a communication cable includes a plurality of twisted pairs of electrical conductors, each pair having a first insulating material about one of the electrical conductors and a second insulating material about the second electrical conductor.

Abstract: A cable comprising one or more electrical conductors or a core of one or more electrical conductors, each conductor or core being surrounded by an insulating composition comprising a mixture of(i) about 20 to about 50 percent by weight of a homogeneous polyethylene having a polydispersity in the range of about 1.5 to about 3.5 and an essentially uniform comonomer distribution; and(ii) about 50 to about 80 percent by weight of a homopolymer of ethylene made by a high pressure process.

Abstract: A coextruded triple layer electric conductor for cable insulation having low humidity absorption, low emission of toxic gases, low smoke emission and high flame retardance comprising a first layer comprising polyvinyl chloride as a base over an electric conductor core, a second layer over first layer, comprising high density polyelthylene optionally modified with an ethylene copolymer, and a third layer over said second layer comprising polyvinyl chloride as a base.

Abstract: Process for the reduction of breakdown risks with respect to the solid dielectric insulant of transmission cables and lines operating under high voltages. The insulant normally separates the conductors of a multi-conductor line or the central conductor and the outer metal envelope of a coaxial line. Small amounts of metal particles with dimensions below 1 micron are added to the dielectric insulant mass.

Abstract: A coaxial cable with standard coaxial structure of central conductor, foamed polyethylene dielectric, and outer conductor and having a jacket that provides sufficient flame resistance and smoke generation to allow the cable to be used in plenum spaces. The jacket includes a halogenated polymer with a heat of combustion less than 7000 BTU per pound and including a free-radical scavenger.

Abstract: A fire-resistant polyvinyl chloride (PVC) formulation suitable for use as sheathing on electric wires and cables, contains 15-60 parts by weight per 100 parts by weight of PVC (phr) of a phosphate plasticize, 10-40 phr of a halogenated plasticize, 15-60 phr of aluminium trihydroxide, together with 5-20 phr of an additive combination of 10-90 wt% ofr antimony trioxide and 90-10 wt% of zinc stannate.

Abstract: A plenum cable is provided which passes the category 5 requirements, including the UL 910 burn/smoke test, the cable containing at least four twisted pairs of insulated conductors, the insulation of one of the pairs of insulated conductors being foamed polyolefin which is free of flame retardant additive and the insulation of the other three twisted pairs of insulated conductors being fluoropolymer, the cable having a skew between twisted pairs of no greater than 30 nanoseconds.

Abstract: A data communication cable for transmitting high frequency signals which includes at least one pair of conductors wherein each conductor is enclosed by a first inner layer of insulation and a second outer layer of insulation, and wherein the insulated conductors are enclosed by a jacket. The first inner layer of insulation is a polyolefin which may include a flame retardant and is in the form of an extruded expanded foam. The second or outer layer of insulation is a fluoropolymer and the jacket is a flame retardant and low-smoke PVC composition.

Abstract: A communication cable includes at least a first and a second twisted pairs of conductors. The first twisted pair of conductors is covered by a first insulation material, and the second twisted pair of conductors is covered by a second insulation material that is different than the first insulation material. The second twisted pair of conductors has a signal phase delay that is substantially equal to the signal phase delay of the first twisted pair of conductors such that the skew of the cable is substantially zero. In certain embodiments, the first insulation material is a fluoropolymer. In such embodiments, the second insulation material may be a nonfluoropolymer. In addition, the twist lay of the first twisted pair of conductors may be different than the twist lay of the second twisted pair of conductors. Moreover, the thickness of the first insulation material may be different than the thickness of the second insulation material.

Abstract: A high-speed data communications cable has geometrically concentric layers of twisted pairs of wires. A first, innermost layer includes a first twisted pair of wires having a unique lay length and a first and second dielectric filler. A second geometrically concentric layer is formed about the innermost layer and includes 9 twisted pairs of wires having 5 lay lengths. A third geometrically concentric layer is formed about the second layer and includes 25 twisted pairs of wires having 5 lay lengths. The first, second and third layers are enclosed in a thermoplastic jacket resulting in a flexible data cable with a minimal diameter. Additional layers of more twisted pairs of wires may also be used. A plurality of communication cables may also be commonly sheathed.

Abstract: There is disclosed a communications cable having a cable jacket and a first pair of twisted wires disposed within the jacket, each wire thereof having a conductor surrounded by a first insulating material. A second twisted pair of wires is disposed within the jacket and has a twist lay length different from that of the first twisted pair. Each wire of the second twisted pair has a conductor surrounded by an insulating material. The insulating material of the first twisted pair differs in a physical property from the insulating material of the second twisted pair, the physical property of the insulating material of the second pair being correlated with the physical property of the insulating material of the first twisted pair and with differences in twist lay length of the first and second twisted pairs so that the phase delay of the twisted pairs is matched. There is also provided a communications cable having more than two twisted pairs.

Abstract: A communication cable includes a plurality of twisted pairs of electrical conductors, all electrical conductors being surrounded by a layer of a modified olefin based material.

Abstract: Coaxial cables having a composite braid with a plurality of water expandable strands of yarn woven therein, preferably to quad coaxial cables having the inner metallic braid as the metallic composite braid. The composite braid has a plurality of woven metallic strands, at least one first strand of water-blocking yarn helically wound in one direction and extending along the length of the composite braid, the at least one first strand being woven into the metallic strands of the composite braid, at least one second strand of water-blocking yarn helically wound in an opposite direction with metallic strands of the composite braid and extending along the length of the composite braid, the first and second water-blocking strands of yam crossing over and contacting each other at a plurality of spaced yarn contact points and said first and second water-blocking strands of yarn being water-expandable.

Abstract: A plenum cable having a plurality of twisted pair conductors with at least one pair having a non-fluorinated polyolefin insulation and all of the twisted pair conductors which are adjacent to each other having a lay length of about 0.4 to 4" with the preferred lay length being 0.4 to 1.25 inches. The lay length of the non-fluorinated polyolefin twisted pair conductor is preferably 1.0 to 1.25 inches and the lay lengths of the fluorinated polyolefin twisted pair conductors is preferably 0.5 to 85". The twisted pair conductor insulation is preferably radially joined along the entire length thereof. Preferably, the twisted pair conductors all have an impedance of 90 to 110 ohms and the impedance does not vary by more or less than .+-.0.05 of an average impedance. Also, the twisted pair conductors preferably have a center-to-center distance that does not vary by more or less than .+-.0.03 of an average center-to-center distance.

Abstract: A composite material having heat shrinkable fibers comprising LLDPE, characterized in that the LLDPE has a weight average molecular weight of from 55,000 to 130,000 and a crystallinity less than 60%.

Abstract: An optical fiber cable suitable for use in building plenums includes a core comprising at least one optical fiber; a core tube formed of a non-halogenated polyolefin-based polymer material surrounding the core; a jacket formed of chlorinated plastic material surrounding said core tube; and a plurality of dielectric strength members which are disposed between said core tube and said jacket, said cable being capable of meeting all test criteria set out in UL Standard 910.

Abstract: A composite distribution cable for connection to a customer's premises has a fiber optic cable, twisted voice band pairs, copper power cables, and a coaxial cable within a common sheath. Water blocking members within the cable fill the voids between the conducting members and the sheath upon contact with water or other liquid.

Abstract: A plenum cable having a plurality of twisted pair conductors enclosed by a jacket. A plurality of the twisted pair conductors has one insulating material thereon and at least one twisted pair conductor has a different insulation material thereon. In the preferred structure at least one twisted-pair conductor has flame retardant polyethylene or flame retardant polypropylene insulation and at least one other twisted pair conductor being insulated with fluorinated ethylene propylene, tetrafluoroethylene, or ethylenechloro-trifluoroethylene. The preferred twisted pair conductors have a center-to-center distance along any point of a 1000 ft. twisted pair conductor that is .+-.0.3 of an average center-to-center distance and/or have an impedance of 90 to 110 ohms and a variation of .+-.0.

Abstract: The preferred embodiment of the cable disclosed includes seven groups of twisted-pairs, outlined in dashed lines in FIG. 1. Groups 12, 14, 17 and 19 have four pairs each, and groups 13, 16 and 18 have three pairs each. Six of the groups, namely 12, 13, 14, 16, 17 and 18 are referred to herein as the outer groups since they are collectively twisted and wound helically about the seventh group 19 which is centrally located throughout the length of the cable. Each of the groups of twisted pairs may be held together by a cable binder such as nylon yarn 22. The core thus formed is enclosed within a jacket 23, and the entire assembly is referred to in the art as a "honeycomb" structure. In accordance with the present invention, the twisted pairs of each of the six outer groups are insulated with a fluorinated ethylene-propylene copolymer (FEP) material such as, for example, Teflon.RTM., while the twisted pairs of the central group are insulated with a high density polyethylene (HDPE) material.

Abstract: The disclosure herein describes a flame resistant electric cable which is capable of resisting flame temperatures in the neighborhood of 1000.degree. C. for at least two hours; the cable includes at least two electrical conductors each including an electrical wire, an extruded tubular member made of silicone surrounding the electrical wire, and an outer protective layer of braided inorganic material which surrounds the tubular member; the cable includes, underneath an overall outer braided jacket, an extruded elongate tubular member made of a silicone elastomer having a wall thickness of at least 0.030 of an inch.

Abstract: A communications cable that may be used in buildings in concealed areas such as riser shafts is constructed of non-halogen materials. The core includes insulated conductors that are enclosed with a plastic, polyolefin insulating material. These insulated conductors are twisted into pairs to form a multi-pair core. The core is surrounded and protected with a non-halogen, plastic jacket material. The cable has exceptional voice and data transmission properties due to the polyolefin insulation and is highly flame retardant. Compared with halogenated materials, the cable generates relatively little smoke, is less corrosive, and generates less toxic gases when burned.

Abstract: A flame retardant and smoke suppressant electrical insulation composition for an electrical conductor comprises an inner layer and an outer layer. The inner layer, which contacts and surrounds the conductor, comprises a foamed polymeric material selected from the group consisting of polyolefins and polyurethane. The outer layer, which contacts and surrounds the inner layer, comprises a halogenated polymeric material and at least one outer layer additive to render the outer layer flame retardant and smoke suppressant. A flame retardant and smoke suppressant insulated electrical conductor comprises a length of electrically conductive material surrounded by the insulation composition. A flame retardant and smoke suppressant jacketed electrical cable comprises a plurality of insulated electrical conductors.

Abstract: A pulsed voltage surge resistant magnet wire comprising a conductor, a continuous and concentric and flexible uniform coat of base insulation material superimposed on the conductor and an essentially continuous and concentric and uniform pulsed voltage surge shield overlaying the coat of base insulation material.

Abstract: A communication cable includes one or more first twisted pairs of electrical conductors, each electrical conductor being surrounded by a layer of a first plenum rated insulating material. The cable also includes one or more second twisted pair of electrical conductors, each electrical conductor thereof being surrounded by a layer of a second plenum rated insulating material. The first and second plenum rated insulating materials are different.

Abstract: The present invention relates to a method of thermally and mechanically protecting cables and bundles of cables by use of a sheath braided directly around the element to be protected using a braiding yarn constituted by a plurality of elementary strands formed by interlacing synthetic fibers obtained after cracking and spinning an aramid fiber and a carbonizable oxidized organic fiber. The carbonizable oxidized organic fiber constitutes the major portion of the synthetic fibers making up the elementary strand for the braiding yarn. The invention also provides a thermal and mechanical protective sheath for cables and bundles of cables obtained by the method. In order to improve certain mechanical or thermal characteristics of the sheath, it may be associated with a material made of a fiber additional to said two synthetic fibers, in order to form the elementary strand, or indeed the sheath braided in this way may itself be covered in additional braiding based on aramid fibers.

Abstract: A fire retardant cable for use primarily as a riser cable in buildings has a plurality of groups of twisted pairs of conductors arranged in a "honeycomb" structure. Each conductor comprises a metallic conducting member encased in a single layer of a non-flame retardant polyolefin material such as high density polyethylene. The groups of conductors are surrounded by a jacket of flame retardant poly(vinyl chloride) material.

Abstract: A flame retardant composition comprising an effective synergistic flame retardant combination of a melamine phosphate and tris(neopentyl) nitrilotris(methylphosphonate) suitable for use as an additive to a normally flammable polymer composition, especially wire insulation and cable jackets.

Abstract: A low pair count high performance, TIA/EIA 568 Category 5 plenum rated cable has a core made up of a plurality of twisted pairs of conductors, each conductor being insulated with a tetrafluoroethylene/hexafluoropropylene copolymer material, and a single twisted pair of conductors wherein each conductor is insulated with a high density polyethylene material. The core is surrounded and enclosed in a jacket of a plasticized copolymer of ethylene and clorotriflouoroethylene material.

Abstract: A fire safety coating, particularly intended for application to hydrocarbon-conducting steel pipes (1) in the splash zone underneath oil plants at sea, consists of at least three layers, where the outer layer (5) is a mechanical protecting layer of rubber or plastic material, the next inside layer (4) is a flame-stopping layer comprising inorganic fibers and a rubber material, and an inside layer (3) is a rubber material which reacts particularly at a high temperature to liberate gases which both prevent inward penetration of oxygen and cause a transformation of the rubber material in the flame-stopping layer (4) to form a hard shell.

Abstract: An insulated electric wire for high-voltage direct current comprising a conductor having thereon an insulation layer including a polyethylene resin composition, and a sheath layer provided on the-outer periphery of the insulation layer. The sheath layer includes a flame retardant resin composition including a polyvinylchloride grafted polyolefin resin. The flame retardant resin composition contains either (i) a lead compound stabilizer and a hydrotalcite or (ii) a lead compound stabilizer and a phosphorous ester compound.

Abstract: A telecommunications cable having a cable core in which each conductor is surrounded by an individual dual layer insulation of an inner layer of flame retardant polyolefin and an outer layer of fluorinated ethylene propylene. The cable is for plenum chamber usage in which smoke is to be minimized. Although the flame retardant polyolefin is a known smoke generating substance which does not satisfy plenum test smoke requirements, its use in this structure is entirely suitable for plenum chamber use because little or no smoke is actually generated as the outer layer protects the inner layer from combustion.

Abstract: The present invention features a surge-protected cable for use in the wire leads and wire-wound stators of electrical motors. The cable of the invention is of the "filter line" type. This invention reduces failures in the stator windings of variable frequency drive (VFD) motors by attenuating peak voltages and transient voltage spikes. The "filter line" type of cable insulation prevents "dirty" power from unabated travel along the axis. This invention's type of filter line cable features a core member of one or more strands of conductive material overlaid with a primary insulation layer containing ferrites and/or magnetites; this layer is then further overlaid with a flame-retardant insulation jacket layer made of high-temperature material. Both the primary insulation and the outer jacket layer are cross-linked.

Abstract: A cable for use within customer premises that effectively extends outside plant service to within the building. The cable has first and second core assemblies preferably formed of flame resistant material completely isolated from each other and surrounded by a shielding member having a rough FIG. 8 configuration. Each of the cores is completely enclosed within the loops formed by the shielding member and completely isolated from the other core. The shielding member is surrounded by a preferably flame resistant outer jacket.

Abstract: An insulated conductor and the flame retardant insulation composition used in plenum cables. The insulation composition includes as a polyolefin blend from about 50 to 85 parts by weight of polypropylene, 10 to about 40 parts by weight of a very low density polyethylene and from about 5 to about 20 parts by weight of a high and/or low density polyethylene. To one hundred parts by weight of the polyolefin blend there is about 6 to about 20 parts by weight of a chlorinated flame retardant, from about 4 to about 12 parts by weight of a flame retardant intumescent, from about 20 to 60 parts by weight of a non-halogen flame retardant, from about 0.2 to about 1.0 parts by weight of hindered phenolic stabilizer; and from about 0.1 to about 0.4 parts by weight of additional stabilizers. One of the non-halogen flame retardants in the polyolefin composition, may be zinc borate which triggers polymer and flame retardant decomposition when the polyolefin composition is exposed to an igniting flame.

Abstract: A plenum cable having a plurality of insulated conductors enclosed by a jacket. Each of the insulated conductors or twisted-pair conductors has a dielectric constant that varies .+-.0.25 from any other insulated conductor or twisted-pair conductor. In the preferred structure at least one twisted-pair conductor has flame retardant polyethylene or flame retardant polypropylene insulation and at least one other twisted pair conductor being insulated with fluorinated ethylene propylene, tetrafluoroethylene, or ethylenechloro-trifluoroethylene.

Abstract: A flat cable 1 comprises, a ribbon (5) of dielectric material, electrical conductors (2, 3, 4) on one side only of the ribbon (5), a jacket 6) of flame resistant insulative material enclosing the ribbon (5) and the conductors (2, 3, 4), the ribbon (5) and the conductors (2, 3, 4) projecting from opposite ends of the jacket (6) for connection to electrical connectors.

Abstract: A communication cable includes a plurality of twisted pairs of electrical conductors, each electrical conductor being surrounded by a layer of plenum rated insulation. The cable also includes at least one additional twisted pair of electrical conductors, each electrical conductor thereof being surrounded by a layer of non-plenum rated insulation.

Abstract: This invention relates to a method for transmitting communication signals and electrical power on a cable between two spaced apart locations, for example between a land based control center and an offshore installation. The communication signals are transmitted over at least two twisted pairs The conductors of each twisted pair are connected in parallel to constitute a power conductor. The communication and power transmissions are separated by transformers. The invention also relates to a cable for performing the method. The cable includes at least two power conductors, each being constituted by one pair of twisted insulated conductors, enclosed within an insulation sheath and outer armor and corrosion protection.

Abstract: A radiating air-dielectric coaxial cable for plenum applications comprises an inner conductor; a non-halogenated dielectric spacer around the inner conductor; and a single, continuous, outer conductor surrounding the dielectric spacer in direct contact therewith. The outer conductor has apertures along its length for the passage of electromagnetic radiation. At least one layer of inert, flame-retardant barrier tape is wrapped over the outer surface of the outer conductor so as to cover each of the radiating apertures of said outer conductor to prevent the dielectric spacer from flowing out through the radiating apertures when the dielectric material is melted. A jacket of halogenated, highly flame-retardant polymer is extruded over the wrapped layer of barrier tape.

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: A transmission cable having a nonhalogenated jacket and a nonhalogenated composition for use as a transmission cable jacket. The jacket is prepared from a nonhalogenated polyolefin based formulation having flame retardant, low corrosivity, low toxicity and low smoke characteristics. The jacket material insulates a core transmission medium such as a metallic conductor or optical fiber. The jacket is extruded about the core or insulator during manufacture. The inventive cable has a jacket formed of nonhalogenated polyethylene and nonhalogenated ethylene vinyl acetate and provides a combination of desired mechanical characteristics, improved performance and manufacturing features while eliminating undesirable corrosive products released during a fire.

Abstract: A duct assembly comprises a plurality of ducts longitudinally joined by an interconnecting web. The ducts are preferably arranged in a ribbon format, a single duct in thickness, enabling greater flexibility. The ducts preferably include an inner layer having a bore therethrough and an outer fire retardant layer. A method for manufacturing such a flexible duct is also disclosed.