摘要:
A cable having an electrical conductor, a silicone sheath surrounding the conductor, and a separation layer between the conductor and the silicone sheath. Said cable is characterized in that the separation layer is made of a silicone material that is less adhesive to the conductor than the material of the silicone sheath. The invention further relates to a method for manufacturing a cable of said type.
摘要:
A class 1E cable for a third generation passive nuclear power plant in a mild environment, comprising: at least one conductor; wherein an heterogeneous double-layer co-extrusion insulator is extruded on an external wall of the conductor, a wrapping tape is wrapped around the heterogeneous double-layer co-extrusion insulator to form a wire core, and the wire core is provided in a filler; a shielding layer 6, an oxygen barrier layer an inner protection jacket layer, and an outer protection jacket layer are wrapped around the filler; the heterogeneous double-layer co-extrusion insulator comprises an inner insulating layer and an outer insulating layer, wherein the inner insulating layer and the outer insulating layer are made of different materials; and the inner protection jacket layer and the outer protection jacket layer are made of different materials.
摘要:
The present disclosure relates to an impact resistant, multipolar power cable (10) comprising, a plurality of cores (1), each core (1) comprising at least one conductive element (3) and an electrical insulating layer (5) in a position radially external to the at least one conductive element (3). The cores (1) are stranded together so as to form an assembled element providing a plurality of interstitial zones (2). An expanded polymeric filler (6) fills the interstitial zones (2) between the plurality of cores (1). An expanded impact resistant layer (7) is in a position radially external to the expanded polymeric filler (6) and comprises a polymer that differs from the expanded polymeric filler (6).
摘要:
The present invention relates generally to cables suitable for use in plenum applications. In particular, the present invention relates to coaxial cables suitable for use in plenum applications (which exhibit flame spread and smoke generation properties that comply with industry standards, e.g., UL 910 or NFPA 262) without compromising electrical performance. The cable has two or more layers of insulation where the inner layer is made of a material having a high melt flow index and the outer layer is made of a material having a low melt flow index.
摘要:
Cable structures with multi-material extruded strain reliefs and systems and methods for making the same are provided. In some embodiments, a cable structure may include at least two materials simultaneously extruded through a die and about a conductor. A relationship between the two materials may be changed during the simultaneous extrusion for varying the stiffness of the cable structure, which may thereby provide a strain relief region to the cable structure. One of the two materials may be stiffer than another of the two materials, and the ratio of the amount or thickness of one of the two materials with respect to the amount or thickness of the other of the two materials may be varied during the extrusion process to vary the stiffness of the cable structure along its length for providing the strain relief region.
摘要:
Cables are constructed with extruded discontinuities in the cable jacket that allow the jacket to be torn to provide access to the cable core. The discontinuities can be longitudinally extending strips of material in the cable jacket.
摘要:
Flame retardant thermoplastic polyurethane (TPU) compositions are disclosed having a flame retardant package comprising an organo-phosphinate component, an organo-phosphate component, and a polyhydric alcohol. The flame retardant components may be present in an amount from about 5 to about 40 weight percent of the phosphinate compound; from about 5 to about 20 weight percent of the phosphate compound, and from about 0.1 to about 15 weight percent of the polyhydric alcohol, based on the total weight of the TPU composition. Processes are disclosed to make the TPU compositions and to make wire and cable constructions employing the TPU compositions as the jacket of the wire and cable constructions. The TPU compositions exhibit excellent flame retardant capabilities as measured by Limited Oxygen Index testing and/or UL 94 Vertical Burn tests.
摘要:
An electric wire that has a conductor held by spacers in a covering of polytetrafluoro-ethylene (PTFE), continuous cells being formed between the covering, the spacers, and the conductor. In an axial section, the majority of the PTFE fibers of the spacers point in a substantially radial direction, thereby imparting excellent robustness to the spacers. A method of manufacturing such an electric wire, in which method an extrudate of PTFE is caused to pass through an extrusion passage around the conductor in such a manner as to form the covering; so that: upstream from an expansion section, the covering is formed by a guide; and downstream from this section, the cells are formed by section members, the spacers being formed by filling expansion channels situated between walls of the section members.
摘要:
A cable which has at least two strands which each have a conductor surrounded by an insulation, where the strands are surrounded by an inner casing composed of a first polymer mixture and by an outer casing of a second polymer mixture resting on the inner casing, where the polymer components of the first and second polymer mixtures include a thermoplastic elastomer, and where the inner casing is foamed.
摘要:
An electrical cable and a method for manufacturing the electrical cable are provided in which a plurality of insulated conductors have an inner protective layer extruded thereabout. A plurality of longitudinally extending ribs or fins or exterior ribbed or finned surfaces are formed outward of the inner protective layer between which exist a plurality of voids. An outer insulation layer can be formed in the same operation as the fins or ribbed surface and the inner layer or in a subsequent operation. A self-sealing elastomeric material is applied to the conductor surface or is present between the fins and between the inner protective layer and the outer insulation layer.