EP2091052A2 - Stromkabel mit leicht entfernbarem Kabelmantel - Google Patents

Stromkabel mit leicht entfernbarem Kabelmantel Download PDF

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Publication number
EP2091052A2
EP2091052A2 EP09152238A EP09152238A EP2091052A2 EP 2091052 A2 EP2091052 A2 EP 2091052A2 EP 09152238 A EP09152238 A EP 09152238A EP 09152238 A EP09152238 A EP 09152238A EP 2091052 A2 EP2091052 A2 EP 2091052A2
Authority
EP
European Patent Office
Prior art keywords
protective sheath
sheath
longitudinal grooves
electrical cable
cable according
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Withdrawn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
EP09152238A
Other languages
English (en)
French (fr)
Other versions
EP2091052A3 (de
Inventor
Arnaud Piechaczyk
Olivier Schuepbach
Philippe Bras Pereira
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.)
Nexans SA
Original Assignee
Nexans SA
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 Nexans SA filed Critical Nexans SA
Publication of EP2091052A2 publication Critical patent/EP2091052A2/de
Publication of EP2091052A3 publication Critical patent/EP2091052A3/de
Withdrawn legal-status Critical Current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
    • H01B7/38—Insulated conductors or cables characterised by their form with arrangements for facilitating removal of insulation

Definitions

  • the present invention relates to an electric cable. It typically, but not exclusively, applies to the fields of energy and / or telecommunication cables.
  • This electrical cable comprises a set of insulated electrical conductors surrounded by a protective sheath.
  • Said protective sheath has on the one hand, on its outer surface so-called external longitudinal ribs and so-called external longitudinal grooves, and on the other hand, on its inner surface so-called internal longitudinal grooves.
  • each pair of external longitudinal grooves constitute break primers of the protective sheath.
  • the external longitudinal ribs are centered between each pair of external longitudinal grooves, thus making it possible to grip and pull on the protective sheath.
  • the internal longitudinal ribs are placed facing the external longitudinal grooves.
  • the outer longitudinal grooves of this electric cable are areas where accumulate and attach elements surrounding said protective sheath, such as for example oil, water, bacteria, ...
  • the present invention provides an electric cable which aims to overcome the aforementioned drawbacks, while being easily removable.
  • the solution according to the present invention is to propose an electrical cable comprising one or more insulated electrical conductors forming a set of isolated conductors extending longitudinally inside a protective sheath, the inner surface of said protective sheath comprising at least two longitudinal grooves intended to allow the stripping of the protective sheath, characterized in that the outer surface of the protective sheath does not comprise longitudinal grooves intended to constitute initiators for breaking the protective sheath, and in that the longitudinal grooves of the inner surface of the protective sheath are arranged substantially equidistant from one another (when the inner surface of the protective sheath comprises two longitudinal grooves) or from each other (when the inner surface of the protective sheath comprises at least three longitudinal grooves).
  • the outer surface of the protective sheath of said cable according to the present invention has good tribological performance and thus good sliding properties so as not to create zones of accumulation and fixation of the elements surrounding said cable.
  • the protective sheath is easily stripped, or tearable, especially manually, regardless of the starting point of the stripping.
  • groove means a zone of lesser resistance, or notch, intended to cause the rupture or tearing of the protective sheath and thus allow its stripping.
  • the inner surface of the protective sheath may comprise at least three longitudinal grooves.
  • the outer surface of the protective sheath may be substantially smooth and uniform.
  • said outer surface thus has substantially no accumulation zone.
  • the outer surface of the protective sheath does not comprise longitudinal ribs such as a shoulder of relatively small width, to capture and pull on the protective sheath, as defined in the document FR 2,706,068 .
  • the stripping force can be at most 50 N, and preferably at most 20 N.
  • the protective sheath may advantageously have a breaking stress of at least 5 MPa, and preferably at least 10 MPa.
  • the breaking stress is conventionally determined in accordance with IEC 60811.
  • the protective sheath may also have an elongation at break of at least 50%, and preferably at least 150%.
  • the elongation at break is conventionally determined in accordance with IEC 60811.
  • each of the longitudinal grooves of the inner surface of the protective sheath may advantageously be of identical shape.
  • the inner surface of the protective sheath comprises at least one longitudinal groove obtained from a notch of cross-section in the shape of "Ve", whose central axis is preferably radial on the cable electric.
  • each of the longitudinal grooves is obtained from a Vee-shaped cross-section cut, whose central axis is preferably radial on the electric cable.
  • the inner surface of the protective sheath comprises at least one longitudinal groove obtained from a "U" -shaped or rectangular cross-sectional cut, whose radial axis is preferably radial on the electric cable.
  • each of the longitudinal grooves is obtained from a U-shaped cross-sectional or rectangular cut, the central axis of which is preferably radial over the electric cable.
  • the protective sheath according to the present invention can be tubing, semi-tubing or stuffing.
  • the figure 1 is a schematic cross-sectional view of an electrical cable with a protective sheath said jamming, according to the present invention.
  • the figure 2 is a schematic cross-sectional view of an electrical cable with a so-called semi-tubular protective sheath according to the present invention.
  • the figure 3 is a schematic cross-sectional view of an electrical cable with a so-called tubular protective sheath according to the present invention.
  • the electrical cable 10 of substantially circular section comprises a set of three insulated electrical conductors 1, preferably twisted, surrounded by a protective sheath 2a.
  • the protective sheath 2a has on its inner surface three longitudinal grooves 3 continuous V-shaped in the thickness of said sheath, these three grooves being placed at about 120 ° from each other. These grooves 3 thus constitute breaking primers for stripping the protective sheath 2a.
  • This protective sheath 2a grooved schematically on the figure 1 is said stuffy. It is obtained by a continuous extrusion process well known to those skilled in the art of a polymer composition so that said composition fills the interstices between the insulated electrical conductors 1 whose volumes are accessible. The pressure at the exit of the extruder to obtain said stuffing sheath notably compresses the V-shaped cross-section notches, and it can thus be difficult to visualize them as such on a cross-sectional section of the electric cable.
  • the polymer composition is of the HFFR ( Halogen Free Flame Retardant ) type based on polyolefin.
  • the figure 2 as well as figure 3 respectively represent an electrical cable 20, 30 of substantially circular section comprising a set of three insulated electrical conductors 1, preferably twisted, respectively surrounded by a protective sheath 2b, 2c.
  • the protective sheaths 2b, 2c have on their inner surface four longitudinal grooves 3 continuous V-shaped in the thickness of said sheath, according to the present invention. These four grooves are placed at about 90 ° from each other.
  • the protective sheath 2b schematically on the figure 2 is called semi-tubing, while the protective sheath 2c schematized on the figure 3 is called tubing.
  • the semi-tubular sheath 2b is a so-called tight sheath around all the insulated conductors 1 so as to immobilize all of said insulated conductors inside said sheath.
  • the tubular sheath 2c is a sheath that leaves the insulated electrical conductors free inside said sheath.
  • This tubular sheath is very simple and quick to perform since it requires a pressure at the exit of the extruder less than that required for the manufacture of tamping and semi-tubing sleeves.
  • Protective sheaths 2b and 2c grooved are also obtained by a continuous extrusion process well known to those skilled in the art of a polymer composition of the HFFR type based on polyolefin.
  • the protective sheaths 2a, 2b and 2c directly surround the insulated electrical conductors 1.
  • the electrical cable does not include any sliding product, such as for example talc, between the insulated conductors and the inner surface of the protective sheath.
  • the protective sheath according to the present invention being easily tearable, a sliding agent for sliding the protective sheath on the insulated electrical conductors is not necessary to access said conductors.
  • These electrical cables respectively comprise an extruded protective sheath 1 mm thick obtained from a HFFR polymer composition comprising a polyolefin matrix and flame retardant fillers.
  • Said protective sheaths comprise one, two or four V-shaped internal longitudinal grooves (notches) of radial depth of approximately half the thickness of the protective sheath, ie approximately 0.5 mm, in particular for a conventional sheath of low voltage cable in the building field.
  • Each protective sheath directly surrounds a twisted set of three insulated copper conductors, each copper conductor having a section of 1.5 mm 2 .
  • the tests also focused on the nature of the protective sheaths, namely jamming, semi-tubing or tubing.
  • the apparatus used to perform the stripping test is a Zwick brand uniaxial traction machine comprising two so-called self-clamping jaws, one of the jaws is fixed and the other jaw is movable on a cross. These two jaws are placed vis-à-vis and are initially 45 mm apart. The traverse speed of the crossbar is 50 mm / min. A length of the order of 100 mm of electric cable as defined above is placed between the two jaws as explained below.
  • one end of the electrical cable is maintained in the fixed jaw. Near this jaw is inserted a copper hook in the notch, said hook being held in the other jaw, then pulls on the hook.
  • the stripping force is measured using a sensor. For all these tests, whether with a jamming, semi-tubing or tubing protection sheath combined with one, two or four notches, the stripping force increases and then stabilizes at a plateau value of approximately 10 N.
  • This value of 10 N is taken as the stripping force and corresponds approximately to the application of a weight of 1 kg on the notches to draw the protective sheath of the electric cable according to the invention.
  • the stripping force thus obtained is of the same order of magnitude as that required for stripping the protective sheath of the electric cable of the document FR 2,706,068 .
  • the protective sheath is thus manually openable, without the aid of special tools that could damage the insulated electrical conductors of the cable during its stripping.
  • the stripping of the electric cable according to the present invention can be carried out by severing the thickness of the protective sheath in order to have access to the electrical conductors, or more particularly by completely cutting the electrical cable, then by manually unsheathing said sheath in order to access isolated electrical conductors and connect them later.

Landscapes

  • Insulated Conductors (AREA)
EP09152238.3A 2008-02-15 2009-02-06 Stromkabel mit leicht entfernbarem Kabelmantel Withdrawn EP2091052A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0850967A FR2927726A1 (fr) 2008-02-15 2008-02-15 Cable electrique facilement degainable

Publications (2)

Publication Number Publication Date
EP2091052A2 true EP2091052A2 (de) 2009-08-19
EP2091052A3 EP2091052A3 (de) 2014-05-28

Family

ID=39732136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09152238.3A Withdrawn EP2091052A3 (de) 2008-02-15 2009-02-06 Stromkabel mit leicht entfernbarem Kabelmantel

Country Status (4)

Country Link
US (1) US20090250240A1 (de)
EP (1) EP2091052A3 (de)
CA (1) CA2652653A1 (de)
FR (1) FR2927726A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2633355B1 (de) 2010-10-28 2020-07-15 Corning Optical Communications LLC Glasfaserkabel mit extrudierten zugangsvorrichtungen und herstellungsverfahren für glasfaserkabel
US9201208B2 (en) 2011-10-27 2015-12-01 Corning Cable Systems Llc Cable having core, jacket and polymeric jacket access features located in the jacket
CN109411144B (zh) * 2018-10-23 2024-02-06 上海新时达线缆科技有限公司 绝缘层可剥离式电缆

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706068A1 (fr) 1993-06-02 1994-12-09 Filotex Sa Câble électrique aisément dégainable.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE794123A (fr) * 1972-01-17 1973-07-17 Int Standard Electric Corp Gaine isolante tubulaire pour cable
US5796046A (en) * 1996-06-24 1998-08-18 Alcatel Na Cable Systems, Inc. Communication cable having a striated cable jacket
US7405360B2 (en) * 1997-04-22 2008-07-29 Belden Technologies, Inc. Data cable with cross-twist cabled core profile
US7214880B2 (en) * 2002-09-24 2007-05-08 Adc Incorporated Communication wire
FR2878857B1 (fr) * 2004-12-08 2008-12-26 Nexans Sa Composition resistante au feu notamment pour materiau de cable d'energie et/ou de telecommunication
US7271344B1 (en) * 2006-03-09 2007-09-18 Adc Telecommunications, Inc. Multi-pair cable with channeled jackets

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706068A1 (fr) 1993-06-02 1994-12-09 Filotex Sa Câble électrique aisément dégainable.

Also Published As

Publication number Publication date
CA2652653A1 (en) 2009-08-15
FR2927726A1 (fr) 2009-08-21
EP2091052A3 (de) 2014-05-28
US20090250240A1 (en) 2009-10-08

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