EP0260373B1 - Flame resistant electrical conductor - Google Patents

Flame resistant electrical conductor Download PDF

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Publication number
EP0260373B1
EP0260373B1 EP87104172A EP87104172A EP0260373B1 EP 0260373 B1 EP0260373 B1 EP 0260373B1 EP 87104172 A EP87104172 A EP 87104172A EP 87104172 A EP87104172 A EP 87104172A EP 0260373 B1 EP0260373 B1 EP 0260373B1
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EP
European Patent Office
Prior art keywords
insulation
band
electrical line
line according
screening
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP87104172A
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German (de)
French (fr)
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EP0260373A2 (en
EP0260373A3 (en
Inventor
Siegfried Richter
Helmar Hetz
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Kabelmetal Electro GmbH
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Kabelmetal Electro GmbH
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Priority to AT87104172T priority Critical patent/ATE70383T1/en
Publication of EP0260373A2 publication Critical patent/EP0260373A2/en
Publication of EP0260373A3 publication Critical patent/EP0260373A3/en
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Publication of EP0260373B1 publication Critical patent/EP0260373B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame

Definitions

  • the invention relates to a flame-resistant electrical line, consisting of at least one electrical conductor, a surrounding insulation and a band of glass fabric wrapped with overlapping edges around the insulated conductor, which is provided on one side with a metal layer (DE-PS 30 44 871) .
  • Lines in the sense of the invention are to be those lines with which telecommunications signals can be transmitted with little loss and without interference. In principle, these are high-frequency (HF) lines and low-frequency (NF) lines.
  • HF lines are used, for example, in radio relay and antenna systems as well as in FM, radio and television reception systems.
  • LF lines are required, for example, for electroacoustics and sound frequency measurement technology. With just one conductor, they are used, for example, as connecting leads for crystal microphones, magnetic sound heads and dictation machines.
  • the lines and for the materials used only their electrical properties are taken into account in order to achieve the best transmission properties.
  • the lines themselves do not burn in the event of a fire and that they can function at least for a certain period of time even at very high temperatures.
  • the word "flame-resistant” should be understood to mean the special properties of an electrical line in the event of a fire, which also include low smoke, non-flammability and freedom from halogen.
  • DE-OS 28 00 688 describes an electrical cable with conductors whose insulation consists of a mica tape and an overlying layer of rubber.
  • the insulated conductors (wires) of this cable are wrapped with an aluminum-plastic laminate.
  • a polyester tape is wrapped around the cable core, over which a layer of a thermoplastic elastomer filled with aluminum hydroxide is attached.
  • a glass fiber mat is wrapped over it, with a braided metal armor over it.
  • a layer of chlorosulfonated polyethylene is attached as an outer protective jacket.
  • the effort to manufacture such a cable is considerable. This applies both to the conductors, the insulation of which comprises a mica tape, and to the entire cable, whose sheath surrounding the cable core consists of five different layers, which cannot be applied in one operation. Such a cable can therefore hardly be used economically.
  • the line according to the aforementioned DE-PS 30 44 871 is much simpler. Above the core formed by several insulated conductors, only a polyester tape coated with aluminum and an outer protective jacket made of plastic are attached. A highly filled polyvinyl chloride mixture is used to insulate the conductors. It should be achieved that the insulation even at very high temperatures of over 1000 ° C. remains stable so that short circuits are avoided. Because of the special insulating material, this known cable cannot be used for purposes with high demands on the transmission properties. In addition, if fire does get to the polyvinyl chloride for any reason, the polyvinyl chloride will start burning, releasing highly toxic and dangerous chlorine gas.
  • the invention is based on the object of specifying a flame-resistant line which, while maintaining a simple structure, meets high requirements for its transmission properties and is non-combustible even at temperatures of over 1000.degree.
  • a halogen-free polymeric plastic such as polyethylene, is used for the insulation of the conductor, which guarantees the favorable transmission properties of the line.
  • This material is accepted for the good transfer properties, even though it is combustible per se.
  • the tape is wound onto the insulation or shielding so that the metal layer is on the outside. It therefore acts like a closed metallic tube for a flame.
  • the overlap is so small that this "tube” has enough gaps so that the gases that are generated when it is very hot can escape. This prevents the wrapping given by the tape from bursting.
  • the shielding required for the purpose of the line is also surrounded by the band and therefore also protected by it.
  • the sheath applied as the outer layer serves as mechanical protection for the entire line and in particular for the strip.
  • Fig. 1 is a side view of a line according to the invention with layers removed in portions.
  • Fig. 2 shows a section through Fig. 1 along the line II - II in an enlarged view.
  • Fig. 3 is a side view of a modified compared to Fig. 1 line.
  • Fig. 4 shows a section through Fig. 3 along the line IV - IV in an enlarged view.
  • Fig. 1 an RF line with a conductor 1, insulation 2 and a shield 3 is shown.
  • the conductor 1 can be designed as a stranded conductor with a multiplicity of individual wires combined or as a solid conductor. It is preferably made of copper.
  • the shield 3 lying above the insulation 2 - also referred to as "outer conductor" in the case of HF lines - can consist of braided or stranded individual wires (FIG. 1). According to FIG. 3, it can also consist of a metal strip which is wrapped or longitudinally folded around the insulation 2.
  • the shield 3 is preferably made of copper.
  • a halogen-free polymer plastic is used as the material for the insulation 2.
  • the insulation 2 consists of polyethylene. This material has excellent electrical properties. It is therefore ideally suited for HF lines.
  • the insulation 2 can in principle also be made of another polymeric plastic, such as polypropylene. These materials are all highly flammable. For many applications, the HF line must therefore be constructed so that the insulation 2 cannot burn.
  • a tape 4 is wound over the shield 3, which consists of a glass fabric provided on one side with a metal layer.
  • the metal layer covers the band 4 over its entire length and width. It can consist of aluminum or copper, for example.
  • the metal layer is on the outside of the pipe.
  • a jacket 5 made of insulating material for protecting the tape 4 is attached above the tape 4. It can consist, for example, of a flame-retardant copolymer of polyethylene.
  • a semiconducting layer 6 can also be applied over the insulation 2, over which the shield 3 lies. Layer 6 serves to avoid microphony.
  • the line according to the invention with the structure shown in the exemplary embodiments is flame-resistant. It does not burn even in high heat and an open flame. In the area of an open flame, only the jacket 5 melts, so that the tape 4 or the metal layer thereof is exposed.
  • the band 4 represents a barrier to open flames. It has a flame-retardant effect, so that the enclosed line and in particular the combustible insulation 2 are effectively protected. This also applies to temperatures of more than 1000 ° C.
  • the overlap of the individual turns of the band 4 must therefore not be too large. But it must also not be too small so that the closed position formed by the band 4 does not open when the line is bent.
  • the width "B" of the overlap should therefore be between 7% and 35% of the width of the band 4. In a preferred embodiment, the width of the overlap is 20%.

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).

Description

Die Erfindung bezieht sich auf eine flammbeständige elektrische Leitung, bestehend aus mindestens einem elektrischen Leiter, einer denselben umgebenden Isolierung und einem mit überlappenden Kanten um den isolierten Leiter herumgewickelten Band aus Glasgewebe, das einseitig mit einer Metallschicht versehen ist (DE-PS 30 44 871).The invention relates to a flame-resistant electrical line, consisting of at least one electrical conductor, a surrounding insulation and a band of glass fabric wrapped with overlapping edges around the insulated conductor, which is provided on one side with a metal layer (DE-PS 30 44 871) .

"Leitungen" im Sinne der Erfindung sollen solche Leitungen sein, mit denen nachrichtentechnische Signale verlustarm und störungsfrei übertragen werden können. Es handelt sich also prinzipiell um Hochfrequenz (HF)-Leitungen und um Niederfrequenz (NF)-Leitungen. HF-Leitungen werden beispielsweise bei Richtfunk- und Antennenanlagen sowie in UKW-, Rundfunk- und Fernsehempfangsanlagen eingesetzt. NF-Leitungen werden beispielsweise für die Elektroakustik und die tonfrequente Meßtechnik benötigt. Mit nur einem Leiter werden sie beispielsweise als Anschlußlitze für Kristallmikrofone, Magnettonköpfe und Diktiergeräte verwendet."Lines" in the sense of the invention are to be those lines with which telecommunications signals can be transmitted with little loss and without interference. In principle, these are high-frequency (HF) lines and low-frequency (NF) lines. RF lines are used, for example, in radio relay and antenna systems as well as in FM, radio and television reception systems. LF lines are required, for example, for electroacoustics and sound frequency measurement technology. With just one conductor, they are used, for example, as connecting leads for crystal microphones, magnetic sound heads and dictation machines.

Für den Aufbau der Leitungen und für die dabei verwendeten Materialien werden grundsätzlich nur deren elektrische Eigenschaften zur Erzielung bester Obertragungseigenschaften berücksichtigt. Für viele Anwendungen, wie beispielsweise bei der Installation in Gebäuden oder Schaltanlagen, muß aber außerdem sichergestellt sein, daß die Leitungen im Brandfall selbst nicht brennen und ihre Funktion auch bei sehr hohen Temperaturen zumindest für eine bestimmte Zeitdauer aufrecht erhalten können. In diesem Sinne sollen unter dem Wort "flammbeständig" die besonderen Eigenschaften einer elektrischen Leitung im Brandfall verstanden werden, zu denen auch Raucharmut, Unbrennbarkeit und Halogenfreiheit gehören.For the construction of the lines and for the materials used, only their electrical properties are taken into account in order to achieve the best transmission properties. For many applications, such as installation in buildings or switchgear, it must also be ensured that the lines themselves do not burn in the event of a fire and that they can function at least for a certain period of time even at very high temperatures. In this sense, the word "flame-resistant" should be understood to mean the special properties of an electrical line in the event of a fire, which also include low smoke, non-flammability and freedom from halogen.

In der DE-OS 28 00 688 ist ein elektrisches Kabel mit Leitern beschrieben, deren Isolierung aus einem Glimmerband und einer darüber liegenden Schicht aus Gummi besteht. Die isolierten Leiter (Adern) dieses Kabels sind mit einem Aluminium-Kunststoff-Laminat umwickelt. Um die aus den Adern bestehende Kabelseele ist ein Polyesterband herumgewickelt, über welchem eine Schicht aus einem mit Aluminiumhydroxid gefüllten thermoplastischen Elastomer angebracht ist. Darüber ist eine Glasfibermatte aufgewickelt, über welcher sich eine geflochtene Metallpanzerung befindet. Als äußerer Schutzmantel ist eine Schicht aus chlorsulfoniertem Polyäthylen angebracht. Der Aufwand zur Herstellung eines solchen Kabels ist erheblich. Das gilt sowohl für die Leiter, deren Isolierung ein Glimmerband umfaßt, als auch für das ganze Kabel, dessen die Kabelseele umgebender Mantel aus fünf unterschiedlichen Schichten besteht, die nicht in einem Arbeitsgang aufgebracht werden können. Ein solches Kabel ist daher wirtschaftlich kaum verwertbar.DE-OS 28 00 688 describes an electrical cable with conductors whose insulation consists of a mica tape and an overlying layer of rubber. The insulated conductors (wires) of this cable are wrapped with an aluminum-plastic laminate. A polyester tape is wrapped around the cable core, over which a layer of a thermoplastic elastomer filled with aluminum hydroxide is attached. A glass fiber mat is wrapped over it, with a braided metal armor over it. A layer of chlorosulfonated polyethylene is attached as an outer protective jacket. The effort to manufacture such a cable is considerable. This applies both to the conductors, the insulation of which comprises a mica tape, and to the entire cable, whose sheath surrounding the cable core consists of five different layers, which cannot be applied in one operation. Such a cable can therefore hardly be used economically.

Die Leitung nach der eingangs erwähnten DE-PS 30 44 871 ist wesentlich einfacher aufgebaut. Ober der durch mehrere isolierte Leiter gebildeten Seele sind hier nur ein mit Aluminium beschichtetes Polyesterband und ein äußerer Schutzmantel aus Kunststoff angebracht. Für die Isolierung der Leiter ist eine hochgefüllte Polyvinylchlorid-Mischung verwendet. Es soll dadurch erreicht werden, daß die Isolierung auch bei sehr hohen Temperaturen von über 1000 °C noch stabil bleibt, so daß Kurzschlüsse vermieden werden. Für Einsatzzwecke mit hohen Anforderungen an die Obertragungseigenschaften ist diese bekannte Leitung wegen des speziellen Isoliermaterials nicht verwendbar. Wenn außerdem aus irgend einem Grunde doch Feuer an das Polyvinylchlorid gelangt, dann beginnt dasselbe zu brennen, wodurch hochgiftiges und gefährliches Chlorgas frei würde.The line according to the aforementioned DE-PS 30 44 871 is much simpler. Above the core formed by several insulated conductors, only a polyester tape coated with aluminum and an outer protective jacket made of plastic are attached. A highly filled polyvinyl chloride mixture is used to insulate the conductors. It should be achieved that the insulation even at very high temperatures of over 1000 ° C. remains stable so that short circuits are avoided. Because of the special insulating material, this known cable cannot be used for purposes with high demands on the transmission properties. In addition, if fire does get to the polyvinyl chloride for any reason, the polyvinyl chloride will start burning, releasing highly toxic and dangerous chlorine gas.

Der Erfindung liegt die Aufgabe zugrunde, eine flammbeständige Leitung anzugeben, die unter Beibehaltung eines einfachen Aufbaus hohen Anforderungen an ihre Obertragungseigenschaften genügt und auch bei Temperaturen von über 1000 °C unbrennbar ist.The invention is based on the object of specifying a flame-resistant line which, while maintaining a simple structure, meets high requirements for its transmission properties and is non-combustible even at temperatures of over 1000.degree.

Diese Aufgabe wird mit einer Leitung der eingangs geschilderten Art gemäß der Erfindung dadurch gelöst,

  • daß die Isolierung des Leiters aus einem halogenfreien polymeren Kunststoff besteht,
  • daß über der Isolierung eine metallische Abschirmung angebracht ist,
  • daß das Band mit außen liegender Metallschicht um die Abschirmung herumgewickelt ist,
  • daß die Breite der Oberlappung zwischen 7 % und 35 % der Breite des Bandes liegt und
  • daß über dem Band ein Mantel aus Isoliermaterial angebracht ist.
This object is achieved with a line of the type described at the outset according to the invention in that
  • that the insulation of the conductor consists of a halogen-free polymer plastic,
  • that a metallic shield is attached over the insulation,
  • that the tape is wrapped around the shield with an external metal layer,
  • that the width of the overlap is between 7% and 35% of the width of the band and
  • that a jacket of insulating material is attached over the tape.

Vorteilhafte Ausgestaltungen der Erfindung gehen aus den Unteransprüchen hervor.Advantageous embodiments of the invention emerge from the subclaims.

Für die Isolierung des Leiters ist ein halogenfreier polymerer Kunststoff, wie beispielsweise Polyäthylen, verwendet, durch welchen die günstigen Obertragungseigenschaften der Leitung garantiert sind. Dieses Material wird der guten Obertragungseigenschaften wegen in Kauf genommen, obwohl es an sich brennbar ist. Es wird aber durch das mit einer bestimmten und vorher festgelegten Oberlappung aufgewickelte Band aus mit Metall beschichtetem Glasgewebe so wirksam geschützt, daß es nicht brennen kann. Das Band ist so auf die Isolierung bzw. die Abschirmung aufgewickelt, daß die Metallschicht außen liegt. Es wirkt daher für eine Flamme wie ein geschlossenes metallisches Rohr. Andererseits ist aber die Oberlappung so gering bemessen, daß dieses "Rohr" genügend Spalte aufweist, damit die bei großer Hitze innerhalb desselben entstehenden Gase entweichen können. Ein Aufplatzen der durch das Band gegebenen Umhüllung ist dadurch vermieden. Die für den Einsatzzweck der Leitung erforderliche Abschirmung ist ebenfalls von dem Band umgeben und daher durch dasselbe mit geschützt. Der als äußere Schicht aufgebrachte Mantel dient als mechanischer Schutz der ganzen Leitung und insbesondere für das Band.A halogen-free polymeric plastic, such as polyethylene, is used for the insulation of the conductor, which guarantees the favorable transmission properties of the line. This material is accepted for the good transfer properties, even though it is combustible per se. However, it is so effectively protected by the band of metal-coated glass fabric wound with a certain and predetermined top overlap that it cannot burn. The tape is wound onto the insulation or shielding so that the metal layer is on the outside. It therefore acts like a closed metallic tube for a flame. On the other hand, however, the overlap is so small that this "tube" has enough gaps so that the gases that are generated when it is very hot can escape. This prevents the wrapping given by the tape from bursting. The shielding required for the purpose of the line is also surrounded by the band and therefore also protected by it. The sheath applied as the outer layer serves as mechanical protection for the entire line and in particular for the strip.

Ausführungsbeispiele des Erfindungsgegenstandes sind in den Zeichnungen dargestellt.Embodiments of the subject matter of the invention are shown in the drawings.

Es zeigen:Show it:

Fig. 1 eine Seitenansicht einer Leitung nach der Erfindung mit absatzweise entfernten Schichten.Fig. 1 is a side view of a line according to the invention with layers removed in portions.

Fig. 2 einen Schnitt durch Fig. 1 entlang der Linie II - II in vergrößerter Darstellung.Fig. 2 shows a section through Fig. 1 along the line II - II in an enlarged view.

Fig. 3 eine Seitenansicht einer gegenüber Fig. 1 abgeänderten Leitung.Fig. 3 is a side view of a modified compared to Fig. 1 line.

Fig. 4 einen Schnitt durch Fig. 3 entlang der Linie IV - IV in vergrößerter Darstellung.Fig. 4 shows a section through Fig. 3 along the line IV - IV in an enlarged view.

In Fig. 1 ist eine HF-Leitung mit einem Leiter 1, einer Isolierung 2 und einer Abschirmung 3 dargestellt. Der Leiter 1 kann als Litzenleiter mit einer Vielzahl von zusammengefaßten Einzeldrähten oder auch als Massivleiter ausgebildet sein. Er besteht vorzugsweise aus Kupfer. Die über der Isolierung 2 liegende Abschirmung 3 - bei HF-Leitungen auch als "Außenleiter" bezeichnet - kann aus geflochtenen oder aufgeseilten Einzeldrähten (Fig. 1) bestehen. Sie kann nach Fig. 3 aber auch aus einem um die Isolierung 2 herumgewickelten oder längsgefalteten Metallband bestehen. Auch die Abschirmung 3 besteht vorzugsweise aus Kupfer.In Fig. 1, an RF line with a conductor 1, insulation 2 and a shield 3 is shown. The conductor 1 can be designed as a stranded conductor with a multiplicity of individual wires combined or as a solid conductor. It is preferably made of copper. The shield 3 lying above the insulation 2 - also referred to as "outer conductor" in the case of HF lines - can consist of braided or stranded individual wires (FIG. 1). According to FIG. 3, it can also consist of a metal strip which is wrapped or longitudinally folded around the insulation 2. The shield 3 is preferably made of copper.

Als Material für die Isolierung 2 ist ein halogenfreier polymerer Kunststoff verwendet. Die Isolierung 2 besteht in bevorzugter Ausführungsform aus Polyäthylen. Dieses Material hat hervorragende elektrische Eigenschaften. Es ist daher bestens für HF-Leitungen geeignet. Die Isolierung 2 kann grundsätzlich auch aus einem anderen polymeren Kunststoff, wie beispielsweise Polypropylen. Diese Materialien sind alle gut brennbar. Für viele Einsatzfälle muß die HF-Leitung daher so aufgebaut werden, daß die Isolierung 2 nicht brennen kann.A halogen-free polymer plastic is used as the material for the insulation 2. In a preferred embodiment, the insulation 2 consists of polyethylene. This material has excellent electrical properties. It is therefore ideally suited for HF lines. The insulation 2 can in principle also be made of another polymeric plastic, such as polypropylene. These materials are all highly flammable. For many applications, the HF line must therefore be constructed so that the insulation 2 cannot burn.

Hierfür ist über der Abschirmung 3 ein Band 4 überlappend aufgewickelt, das aus einem einseitig mit einer Metallschicht versehenen Glasgewebe besteht. Die Metallschicht bedeckt das Band 4 über seine ganze Länge und Breite. Sie kann beispielsweise aus Aluminium oder Kupfer bestehen. Die Metallschicht liegt in der Leitung außen. Ober dem Band 4 ist ein Mantel 5 aus Isoliermaterial zum Schutz des Bandes 4 angebracht. Er kann beispielsweise aus einem flammwidrig eingestellten Copolymer des Polyäthylens bestehen.For this purpose, a tape 4 is wound over the shield 3, which consists of a glass fabric provided on one side with a metal layer. The metal layer covers the band 4 over its entire length and width. It can consist of aluminum or copper, for example. The metal layer is on the outside of the pipe. A jacket 5 made of insulating material for protecting the tape 4 is attached above the tape 4. It can consist, for example, of a flame-retardant copolymer of polyethylene.

Bei der Ausführungsform nach den Fig. 3 und 4 kann über der Isolierung 2 noch eine halbleitende Schicht 6 angebracht sein, über der die Abschirmung 3 liegt. Die Schicht 6 dient der Vermeidung von Mikrofonie.In the embodiment according to FIGS. 3 and 4, a semiconducting layer 6 can also be applied over the insulation 2, over which the shield 3 lies. Layer 6 serves to avoid microphony.

Die Leitung nach der Erfindung mit dem in den Ausführungsbeispielen dargestellten Aufbau ist flammbeständig. Sie brennt auch bei großer Hitze und offener Flamme nicht. Im Bereich einer offenen Flamne schmilzt nur der Mantel 5, so daß das Band 4 bzw. die Metallschicht desselben freigelegt wird. Das Band 4 stellt eine Barriere für offene Flammen dar. Es wirkt flammhemmend, so daß die umschlossene Leitung und insbesondere die an sich brennbare Isolierung 2 wirksam geschützt sind. Das gilt auch für Temperaturen von mehr als 1000 °C.The line according to the invention with the structure shown in the exemplary embodiments is flame-resistant. It does not burn even in high heat and an open flame. In the area of an open flame, only the jacket 5 melts, so that the tape 4 or the metal layer thereof is exposed. The band 4 represents a barrier to open flames. It has a flame-retardant effect, so that the enclosed line and in particular the combustible insulation 2 are effectively protected. This also applies to temperatures of more than 1000 ° C.

Durch das überlappte Aufwickeln des Bandes 4 stellt dasselbe wirkungsmäßig ein gegen Flammen wirksames, geschlossenes metallisches Rohr dar. In diesem Rohr sind jedoch genügend große Spalte vorhanden, durch welche im Inneren desselben entstehende Gase entweichen können. Das ist bei sehr hohen Temperaturen erforderlich, bei denen sich das Material der Isolierung 2 zersetzt.Due to the overlapping winding of the band 4, the same effectively constitutes a closed, metallic tube which is effective against flames. However, there are sufficiently large gaps in this tube through which gases which are produced can escape inside the tube. This is necessary at very high temperatures at which the insulation 2 material decomposes.

Die Oberlappung der einzelnen Windungen des Bandes 4 darf daher nicht zu groß sein. Sie darf aber auch nicht zu klein sein, damit die durch das Band 4 gebildete geschlossene Lage beim Biegen der Leitung nicht aufgeht. Die Breite "B" der Oberlappung soll daher zwischen 7 % und 35 % der breite des Bandes 4 liegen. In bevorzugter Ausführungsform liegt die Breite der Oberlappung bei 20 %.The overlap of the individual turns of the band 4 must therefore not be too large. But it must also not be too small so that the closed position formed by the band 4 does not open when the line is bent. The width "B" of the overlap should therefore be between 7% and 35% of the width of the band 4. In a preferred embodiment, the width of the overlap is 20%.

Claims (8)

1. A flame-resistant electrical line comprising at least one electrical conductor, an insulation surrounding the latter, and a glass-fabric band which is wound round the insulated conductor, with overlapping edges, and which is provided on one side with a metal layer, wherein the insulation of the at least one conductor is composed of a plastics material comprising a halogen-free polymer, a metal screening is laid around the insulation, the said band, with the metal layer on the outside, is wound around the screening, the width of the overlap of the said overlapping edges is between 7 % and 35 % of the width of the said band, and a sheath composed of an insulating material is applied around the band.
2. An electrical line according to claim 1, wherein the width of the said overlap is approximately 20 % of the width of the band.
3. An electrical line according to claim 1 or 2, wherein a layer of semiconducting material is provided between the insulation and the screening.
4. An electrical line according to claim 1, 2 or 3, wherein the screening is a screening produced by braiding or stranding.
5. An electrical line according to claim 1, 2 or 3, wherein the screening consists of a metal band wound on to or folded longitudinally around the insulation.
6. An electrical line according to any of claims 1 to 5, wherein the insulation comprises polyethylene.
7. An electrical line according to any of claims 1 to 6, wherein the sheath comprises a flame-resistant copolymer of ethylene.
8. An electrical line according to any of claims 1 to 7 when used as a high-frequency line.
EP87104172A 1986-09-18 1987-03-20 Flame resistant electrical conductor Expired - Lifetime EP0260373B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87104172T ATE70383T1 (en) 1986-09-18 1987-03-20 FLAME RESISTANT ELECTRICAL CABLE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3631699 1986-09-18
DE3631699A DE3631699C2 (en) 1986-09-18 1986-09-18 Flame resistant electrical wire

Publications (3)

Publication Number Publication Date
EP0260373A2 EP0260373A2 (en) 1988-03-23
EP0260373A3 EP0260373A3 (en) 1988-09-28
EP0260373B1 true EP0260373B1 (en) 1991-12-11

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EP87104172A Expired - Lifetime EP0260373B1 (en) 1986-09-18 1987-03-20 Flame resistant electrical conductor

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US (1) US4810835A (en)
EP (1) EP0260373B1 (en)
AT (1) ATE70383T1 (en)
DE (1) DE3631699C2 (en)
GB (1) GB2195817B (en)
SG (1) SG61591G (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9115888D0 (en) * 1991-07-23 1991-09-04 Bicc Plc Electric & communications cables
US5422614A (en) * 1993-02-26 1995-06-06 Andrew Corporation Radiating coaxial cable for plenum applications
FR2704351B1 (en) * 1993-04-22 1995-05-24 Alcatel Cable Flexible coaxial electrical cable with improved fire resistance.
JP4015694B2 (en) * 1994-07-14 2007-11-28 レイケム・リミテッド Fire resistant wire
GB2294801B (en) * 1994-11-07 1999-04-21 Bka Improvements in and relating to electrical cables
US5898133A (en) * 1996-02-27 1999-04-27 Lucent Technologies Inc. Coaxial cable for plenum applications
US6204445B1 (en) 1997-02-06 2001-03-20 Commscope Properties, Llc Aerially installed communications cable
GB9707300D0 (en) * 1997-04-10 1997-05-28 Plastic Insulated Cables Ltd Communications cable
DE29909835U1 (en) * 1999-06-05 1999-08-12 Cit Alcatel Electrical or optical cable with functional integrity in the event of a fire
GB9930509D0 (en) * 1999-12-24 2000-02-16 Plastic Insulated Cables Ltd Communications cable
US6828022B2 (en) 2000-02-21 2004-12-07 Cables Pirelli Fire-resistant and water-resistant halogen-free low-voltage cables
DE10051962A1 (en) * 2000-10-20 2002-05-02 Alcatel Sa Insulated electrical conductor with functional integrity in the event of a fire
WO2002057828A2 (en) * 2001-01-16 2002-07-25 Parker Hannifin Corporation Flame retardant tubing for a bundle
US6472601B2 (en) * 2001-01-30 2002-10-29 Lockheed Martin Corporation Electrically-conductive, thermally-insulating structure and method
DE102004025853A1 (en) * 2004-05-24 2006-01-19 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Pressure-carrying brake hose of a rail vehicle
GB2448778B (en) * 2007-05-18 2010-04-14 Draka Uk Ltd Fire-resistant cable
CN104992775A (en) * 2015-06-19 2015-10-21 张家港金海港电线电缆有限公司 Durable wire

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617377A (en) * 1966-06-10 1971-11-02 Fujikura Ltd Insulation consisting of ethylene-propylene rubber composition for electric wire and cable
US3576940A (en) * 1968-12-03 1971-05-04 Cerro Corp Flame-retardant wire and cable
US3643007A (en) * 1969-04-02 1972-02-15 Superior Continental Corp Coaxial cable
US3790697A (en) * 1972-10-30 1974-02-05 Okonite Co Power cable shielding
JPS5378087A (en) * 1976-12-17 1978-07-11 Furukawa Electric Co Ltd:The Flame-retardant cable for transmission line
NO141732C (en) * 1977-01-12 1984-09-04 Norsk Kabelfabrik As FLAMM RESISTANT CABLE CONSTRUCTION
GB1597125A (en) * 1977-08-24 1981-09-03 Bicc Ltd Radiating cables
GB2076419B (en) * 1980-05-21 1984-01-25 Furukawa Electric Co Ltd Cross-linked polyethylene insulated power cable
DE3044871C2 (en) * 1980-11-28 1986-06-05 kabelmetal electro GmbH, 3000 Hannover Flame-resistant electrical cable
JPS58154514U (en) * 1982-04-12 1983-10-15 古河電気工業株式会社 Rubber, plastic insulated power cable
EP0224281B1 (en) * 1982-10-01 1990-12-27 Raychem Limited Flame retarded cladding
US4549041A (en) * 1983-11-07 1985-10-22 Fujikura Ltd. Flame-retardant cross-linked composition and flame-retardant cable using same
DE3544810A1 (en) * 1985-12-18 1987-06-19 Eilentropp Hew Kabel PROTECTIVE COVER AGAINST OUTSIDE HEAT AND FIRE FOR STRING-SHAPED GOODS

Also Published As

Publication number Publication date
DE3631699C2 (en) 1993-11-11
EP0260373A2 (en) 1988-03-23
DE3631699A1 (en) 1988-03-24
GB2195817A (en) 1988-04-13
US4810835A (en) 1989-03-07
GB2195817B (en) 1990-05-30
SG61591G (en) 1991-08-23
GB8721922D0 (en) 1987-10-21
ATE70383T1 (en) 1991-12-15
EP0260373A3 (en) 1988-09-28

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