EP0120382A1 - Low-voltage cable - Google Patents

Low-voltage cable Download PDF

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Publication number
EP0120382A1
EP0120382A1 EP84102638A EP84102638A EP0120382A1 EP 0120382 A1 EP0120382 A1 EP 0120382A1 EP 84102638 A EP84102638 A EP 84102638A EP 84102638 A EP84102638 A EP 84102638A EP 0120382 A1 EP0120382 A1 EP 0120382A1
Authority
EP
European Patent Office
Prior art keywords
covering
cross
weight
parts
compound
Prior art date
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.)
Withdrawn
Application number
EP84102638A
Other languages
German (de)
English (en)
French (fr)
Inventor
Germano Beretta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pirelli and C SpA
Original Assignee
Pirelli Cavi SpA
Cavi Pirelli SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pirelli Cavi SpA, Cavi Pirelli SpA filed Critical Pirelli Cavi SpA
Publication of EP0120382A1 publication Critical patent/EP0120382A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
    • 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 present invention concerns a low-voltage cable which is resistent to heat, and which does not propagate fires - and more precisely, to an electric cable that is heat-resistent and non fire-propagating, that is included in the category of low-voltage cables that are known under the name of 'building wires'.
  • these cross-linking additives of the P.V.C. have the drawback of reducing the insulating properties of the compound if, as inevitably occurs in practice, they are still present after the cross-linking of the P.V.C., and hence, to reduce the dielectric properties in the conductor coverings of the cable formed out of such a compound.
  • the quantity of mineral fillers is limited - and hence, cables that have the property of non-propagating fires are not obtainable.
  • the aim of the present invention is to have low-voltage cables pertaining to the 'building wires' category, having a P.V.C. base covering for the conductor in which there is encountered an optimum resistence to heat and against any propagation of fires and an optimiization both, of the dielectric characteristics as well as of the mechanical characteristics.
  • a low voltage cable comprising a conductor with an extruded- covering surrounding it, said extruded covering being constituted by a primary-covering that is in contact with the conductor, and by a secondary-covering surrounding the primary-covering; said coverings being made out of a P.V.C. based compound, characterized by the fact that the primary covering is of a thermoplastic compound, based on P.V.C., containing mineral fillers in quantities that are greater than 60 parts by weight with respect to 100 parts by weight of P.V.C., and that said secondary covering is a compound based on P.V.C. cross-linked through radiation.
  • the cable comprises a conductor 1 - constituted by a single wire or by several layed-up wires, surrounded by a covering comprised by an extruded primary-covering 2, covered by a secondary-covering 3, said coverings being closely joined together.
  • the primary-covering 2 is of a thermoplastic compound based on P.V.C.
  • the secondary-covering 3 is made of a compound based on P.V.C. cross-linked through radiation - and hence, of a compound that, prior to being cross-linked, contains the necessary additive for said operation.
  • the compounds based on P.V.C., for the formation of the primary-covering 2 are thermoplastics and contain mineral fillers in such quantities as to endow it with the dielectric properties and properties of resistence against fire propagation, that are desired.
  • the mineral fillers present in the compound in question - consisting of calcium carbonate, magnesium carbonate, calcined kaolin and mixtures thereof, are of a quantity that is greater than 60 parts by weight with respect to 100 parts by weight of P.V.C.
  • the quantity of mineral fillers present in the compound is comprised between 60 and 120 parts s by weight, with respect to 100 parts by weight of P.V.C., so as to obtain an optimization of the dielectric characteristics for the insulation 2 and a resistence against fire propagation.
  • the compounds based on P.V.C. contain a cross-linking agent selected from amongst the divinylbenzene, polyallyl-dimethacrylate esters and polyallyl-trimethacrylate esters such as, for example, the trimethylopropane-trimethacrylate, of a quantity not exceeding 16 parts s by weight, with respect to 100 parts s by weight of P.V.C., and mineral fillers in quantities not exceeding 10 parts by weight, with respect to 100 parts by weight of P.V.C.
  • a cross-linking agent selected from amongst the divinylbenzene, polyallyl-dimethacrylate esters and polyallyl-trimethacrylate esters such as, for example, the trimethylopropane-trimethacrylate, of a quantity not exceeding 16 parts s by weight, with respect to 100 parts s by weight of P.V.C.
  • mineral fillers in quantities not exceeding 10 parts by weight, with respect to 100 parts by weight of P.V.C.
  • the mineral fillers - for the compound forming the secondary-covering 3 are constituted by calcium carbonate and by magnesium carbonate, and preferably of the type obtained through precipitation - i.e. having a high specific surface. Even mixturess of calcium carbonate and magnesium carbonate - of the types obtained through precipitation, can be utlized as fillers in the compound for the formation of the secondary covering.
  • a compound for the formation of the primary-covering 2 of a low voltage cable according to the invention has the following recipe, whose components are expressed in parts by weight.
  • a compound for forming the secondary-covering 3, of a low voltage cable - according to the invention has the following recipe - whose components are expressed in parts by weight.
  • a low voltage cable according to the present invention, has been manufactured, by extruding over the conductor 1, simultaneously or with successive operations, the primary-covering 2 and the compound for forming - after the cross-linking through radiation, the secondary-covering 3.
  • the conductor is formed by thirty wires, each one having a diameter of 0.25 mm, layed-up together with having a complexive section whose area is 1.5 mm2.
  • the primary-covering has a thickness of 0.7 mm and the superimposed layer, which - after the cross-linking through radiation, will constitute the secondary-covering 3, has a thickness of 0.1 mm and, in any case, a thickness not exceeding 15% of the thickness of the primary-covering.
  • the conductor covered by the extruded layers cited above, underwent radiation by means of causing it to pass through an apparatus of a 'per se known' type, that furnished it with a dose of radiation equal to 10 M rad, so as to cross-link the secondary-covering of the cable, and the speed of production is in the same order of magnitude as that of the known cables having a conductor covering constituted entirely of a P.V.C. based thermoplastic compound.
  • the shaped hose has a configuration constituted by a broken- line of equal segments and having curved corners, formed by the assembly of an S-shape and of an L-shape.
  • the manufacturing speed of a cable according to our invention is in the same order of magnitude as that of the 'known' cables having a conductor covering made of a P.V.C. based thermoplastic coupound; whereas the manufacturing speed of the known cables - having a conductor covering of a P.V.C. based compound cross-linked through radiation, is generally slower by 30%.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Organic Insulating Materials (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP84102638A 1983-03-25 1984-03-10 Low-voltage cable Withdrawn EP0120382A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8320282A IT1160761B (it) 1983-03-25 1983-03-25 Cavo per basse tensioni
IT2028283 1983-03-25

Publications (1)

Publication Number Publication Date
EP0120382A1 true EP0120382A1 (en) 1984-10-03

Family

ID=11165409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102638A Withdrawn EP0120382A1 (en) 1983-03-25 1984-03-10 Low-voltage cable

Country Status (10)

Country Link
EP (1) EP0120382A1 (it)
JP (1) JPS59181414A (it)
AU (1) AU2481084A (it)
BR (1) BR8401320A (it)
CA (1) CA1216036A (it)
DK (1) DK107984A (it)
ES (1) ES278543Y (it)
IT (1) IT1160761B (it)
NO (1) NO841149L (it)
NZ (1) NZ207294A (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2280634A (en) * 1993-08-03 1995-02-08 T & N Technology Ltd Flame retardant coatings for insulated electrical wires
WO1998002889A1 (en) * 1996-07-12 1998-01-22 Ab Electrolux Electric cable

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008368A (en) * 1968-05-11 1977-02-15 Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft Electrical conductor having inhibited polymer compositions
CA1093652A (en) * 1978-07-11 1981-01-13 John A. Checkland Electrical conductor with an outer layer of crosslinked insulation
EP0029234A1 (en) * 1979-11-15 1981-05-27 SOCIETA CAVI PIRELLI S.p.A. Low voltage cable provided with improved insulating layer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6026452B2 (ja) * 1978-09-18 1985-06-24 株式会社アマダメトレツクス 機械の作動状態の検知方法
JPS55121211A (en) * 1979-03-12 1980-09-18 Toray Industries Vinyl chloride insulated wire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008368A (en) * 1968-05-11 1977-02-15 Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft Electrical conductor having inhibited polymer compositions
CA1093652A (en) * 1978-07-11 1981-01-13 John A. Checkland Electrical conductor with an outer layer of crosslinked insulation
EP0029234A1 (en) * 1979-11-15 1981-05-27 SOCIETA CAVI PIRELLI S.p.A. Low voltage cable provided with improved insulating layer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2280634A (en) * 1993-08-03 1995-02-08 T & N Technology Ltd Flame retardant coatings for insulated electrical wires
WO1998002889A1 (en) * 1996-07-12 1998-01-22 Ab Electrolux Electric cable

Also Published As

Publication number Publication date
JPS59181414A (ja) 1984-10-15
AU2481084A (en) 1984-09-27
ES278543Y (es) 1986-04-16
IT1160761B (it) 1987-03-11
DK107984A (da) 1984-09-26
BR8401320A (pt) 1984-08-14
IT8320282A0 (it) 1983-03-25
NZ207294A (en) 1986-09-10
DK107984D0 (da) 1984-02-27
ES278543U (es) 1985-09-01
CA1216036A (en) 1986-12-30
NO841149L (no) 1984-09-26

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB LU NL SE

17P Request for examination filed

Effective date: 19841106

17Q First examination report despatched

Effective date: 19860121

R17C First examination report despatched (corrected)

Effective date: 19860613

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19861024

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BERETTA, GERMANO