DE8109304U1 - Electric cable or wire - Google Patents

Description

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SIEMENS AKTIENGESELLSCHAFT Our mark

Berlin and Munich VPA 81 G 4204 DE

Electric cable or wire

The constructive and material-technical further development electrical cables and wires is inter alia. aimed at at least for a certain amount of time in the event of a fire Time of about 10 to 30 minutes or longer to maintain electrical function of the cable or line. This applies, for example, to both signal and Control cables and lines as well as for power cables and lines.

In order to achieve this goal, the insulation of the cores of single-core or multi-core cables or lines has two layers educated. For example, a first, extruded insulating layer of silicone gouromi from a be surrounded by a second layer consisting of an asbestos extrusion coating (DE-OS 28 47 810). There is a similar structure intended for a heat-resistant electrical line, with each core insulation made of a first silicone rubber layer and a second layer consists of an impregnated fiberglass braid (DE-OS 26 14 195).

In another known cable, the electrical function of which is to be guaranteed in the event of fire, is next to A two-layer wire insulation is also provided in a special sheath structure. This consists of one first layer built from mica tapes and off a second, extruded layer of silicone rubber or an ethylene-propylene copolymer (DE-OS 28 00 688). In another known cable for the same purpose, a four-layer wire insulation is provided, wherein the first and third layers of thread or ribbon

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an incombustible örgäiliäöhen material (öiäöfääern, Asbeät, Öliinmer *) And the second and fourth son from, an ejitrüdier-fcen plastic like Xthylen-Pföpylen-RUbbeSc * dreary? SiliköfigUöffli beä "Beheh (ÜS-PS 3 82-B

For the known cables and lines, the arrangement of an insulating layer made of a non-combustible inorganic Material characteristic * The application of such a layer is technically unfavorable {a 10 such a layer also impairs flexibility a corresponding cable core; finally can use such layers lead to difficulties during assembly.

The innovation creates an electrical cable or line * of a sheath Enclosed wire or wires have a two-layer insulation made of an inner, fire-resistant insulating layer And an outer, optionally heat-resistant and / or flame-retardant, extruded insulating layer and with the appropriate design of the inner insulating layer of the wires, the electrical function maintenance is ensured in the event of fire, with the cable or line still exhibiting optimal bending behavior, is easy and inexpensive to manufacture and is single-layered during assembly like a cable or a line can handle extruded core insulation. To achieve these advantages, according to the innovation It is provided that the inner insulating layer consists of an extruded silicon core layer.

In the case of a cable or line designed in this way, the inner silicone rubber layer is formed under the influence of flame depending on the applied Thick a stable framework on the conductor of each individual wire, allowing direct contact with others, if necessary

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Metal parts under tension within desolate outside of the cable "or the line is avoided,

... - In this case, the thickness of the fire-resistant layer * {i per iiäch GEF Funktiöhödäüer ordered and the present operating voltage be varied "In combination with the outer insulating layer of a thermoplastic or elastömeren Isolierwerkstöff such as Ä'thylen-propylene-ethylene Rubberj Vinyl acetate, cross-linked or thermoplastic polyethylene as well as polyvinyl chloride have a core oiling _{constructed in this way with optimal bending behavior t} so that the usual bending and winding requirements for cores and cables or wires are met with this construction. Furthermore, this structure reduces the risk of damage to the core insulation due to the insulation structure during production> laying and assembly to a minimum. In addition, because of its insulating properties, the silicone rubber layer can be included in the insulating layer thickness of the individual wires.

The outer layer can be any, depending on the requirements placed on the entire cable or the entire conduit Core insulation made heat-resistant and / or flame-retardant using appropriate known additives be.

An embodiment of the innovation is shown in the figure. This shows a siebenadriges control cable 1, the wires 2 of the stranded wire 3, the inner insulating layer 4 of silicone rubber and the outer "- ■ ^'.: Insulating layer 5 is composed of an ethylene-propylene rubber on the stranded together wires 2, the inner shell 6, which in turn is surrounded by a copper braid 7 and the outer jacket 8.

1 figure
1 claim

Claims (1)

r * t λ - β ι - k - VPA 81 G 4204- DE right to protection Electrical cable or electrical line, whose core or cores enclosed by a sheath have a two-layered structure Insulation consisting of an inner, fire-resistant insulating layer and an outer, possibly heat-resistant and / or have a flame-retardant extruded insulating layer, characterized in that that the inner insulating layer (4) consists of an extruded silicone rubber layer. 'I I lll