EP3640956A1 - Füllschicht für niederspannungskabel mit verbessertem brandschutz - Google Patents

Füllschicht für niederspannungskabel mit verbessertem brandschutz Download PDF

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Publication number
EP3640956A1
EP3640956A1 EP19203499.9A EP19203499A EP3640956A1 EP 3640956 A1 EP3640956 A1 EP 3640956A1 EP 19203499 A EP19203499 A EP 19203499A EP 3640956 A1 EP3640956 A1 EP 3640956A1
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EP
European Patent Office
Prior art keywords
cable
layer
electrically conductive
conductive element
fibrous material
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EP19203499.9A
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English (en)
French (fr)
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EP3640956B1 (de
Inventor
Jean Fehlbaum
Eric RAUER
Nicolas ESTREBOOU
Franck Gyppaz
Thierry Auvray
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Nexans SA
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Nexans SA
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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 cable comprising at least one insulated electrically conductive element, at least one stuffing layer based on a geopolymer material surrounding said insulated electrically conductive element, and at least one external sheath surrounding said stuffing layer.
  • the invention typically applies, but not exclusively to the field of low voltage power cables (for example less than 6 KV whether they are direct or alternating current) or very low voltage data transmission cables (for example less than 50 V in alternating current or 120 V in direct current). More particularly, the invention applies to radiating cables which are traversed by a current and a low voltage.
  • Radiant cables provide audio, video, or digital data transmission.
  • Radiant cables are particularly suitable for tunnels (metro, road, rail), buildings (airport, shopping center, commercial building, station, stadium), or on board facilities (train, boat, oil platform).
  • Radiant cables transmit radio frequency (RF) and microwave electromagnetic waves in the form of homogeneous transverse electromagnetic waves (TEM), distributed over their entire length.
  • the radiating cables provide a dual emission-reception function of said electromagnetic waves and, for example, make the interior of a tunnel or of a building transparent to the outside.
  • the metal layer is commonly called “external conductor” and it has the particularity of having openings or slots, for example arranged in patterns repeated periodically along the cable.
  • controlled levels of electromagnetic energy can radiate outward and inward from the cable.
  • the cable can then function as a long antenna.
  • the object of the invention is to provide a cable having good fire resistance, and in particular in which the electrically insulating layer or layers of the individually insulated electrically conductive element or elements are protected against fire, while ensuring good flexibility of said cable.
  • the first object of the invention is a cable comprising at least one insulated electrically conductive element, and at least one external sheath surrounding said insulated electrically conductive element, characterized in that it further comprises a packing layer comprising a nonwoven fibrous material and a geopolymer material impregnating said nonwoven fibrous material, said stuffing layer being interposed between said insulated electrically conductive element and the outer sheath.
  • this stuffing layer comprising a nonwoven fibrous material and a geopolymer material impregnating said nonwoven fibrous material, a cable is obtained having good fire resistance, and in particular in which the electrically insulating layer (s) the individually insulated electrically conductive element or elements are protected against fire, while guaranteeing good flexibility of said cable.
  • the expression "said covering layer being interposed between said insulated electrically conductive element and the outer sheath” means that the packing layer is positioned between said insulated electrically conductive element and the outer sheath.
  • the outer sheath surrounds the packing layer, and the packing layer surrounds said insulated electrically conductive element.
  • the expression “tamping layer” also means “tamping layer”. It is also well known according to Anglicism "bedding layer”.
  • Said electrically insulated element is insulated with (by) an electrically insulating layer.
  • the term "electrically insulating layer” means a layer whose electrical conductivity can be at most 1.10 -9 S / m, and preferably at most 1.10 -10 S / m (siemens per meter) (at 25 ° C).
  • the electrically insulating layer of the insulated electrically conductive element can comprise at least one polymeric material, in particular chosen from crosslinked and non-crosslinked polymers, polymers of the inorganic type and of the organic type.
  • the polymeric material can be a homo- or a co-polymer having thermoplastic and / or elastomeric properties.
  • the polymeric material is preferably non-halogenated.
  • the polymers of the inorganic type can be polyorganosiloxanes.
  • the polymers of the organic type can be polyurethanes or polyolefins.
  • the polyolefins can be chosen from polymers of ethylene and propylene.
  • ethylene polymers that may be mentioned include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), copolymers of ethylene and vinyl acetate (EVA), copolymers of ethylene and butyl acrylate (EBA), methyl acrylate (EMA), 2-hexylethyl acrylate (2HEA), ethylene copolymers and alpha-olefins such as for example polyethylene octene (PEO), copolymers of ethylene and propylene (EPR), or terpolymers of ethylene and propylene (EPT) such as for example terpolymers of ethylene propylene diene monomer (EPDM).
  • LLDPE linear low density polyethylene
  • LDPE low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • EVA copolymers of
  • the elongated electrically conductive element can comprise a metal chosen from copper and aluminum.
  • the cable according to the invention meets at least one of the standards for reaction or non-propagation to fire chosen from standards EN 60332-1, EN 60332-3, and EN 50399 (2012/02 + A1 2016); and preferably to standard EN 50399 (2012/02 + A1 2016), in particular to the classification criteria B2ca, s1a, d0, a1 of said standard, and possibly to standards EN 60332-1 and EN 60332-3.
  • the cable of the invention can have a configuration or structure according to either of the first and second variants as described below.
  • the cable of the invention comprises a plurality of insulated electrically conductive elements, and the packing layer surrounds said plurality of insulated electrically conductive elements.
  • the tamping layer fulfills both the function of protection against the propagation of fire and the "proper" tamping function which makes it possible to ensure the formation of a continuous envelope by significantly minimizing or even avoiding the gaps between the outer sheath and insulated electrically conductive elements.
  • the cable is preferably an energy cable, in particular a low voltage energy cable.
  • the packing layer is preferably directly in physical contact with the plurality of insulated electrically conductive elements.
  • the cable according to the first variant is preferably an energy cable, in particular a low voltage energy cable.
  • each of the insulated elongated electrically conductive elements is insulated with (by) an electrically insulating layer as defined above.
  • the electrically insulating layer of each of the insulated elongated electrically conductive elements comprises at least one polyolefin, particularly preferably chosen from homopolymers and copolymers of ethylene.
  • ethylene homopolymers and copolymers include linear low density polyethylene (LLDPE), polyethylene low density (LDPE), medium density polyethylene (MDPE), or high density polyethylene (HDPE), the aforementioned polyethylenes being able to be in crosslinked or uncrosslinked form.
  • the cable of the invention further comprises a metallic layer containing one or more openings, said metallic layer surrounding the electrically conductive insulated element, and said stuffing layer surrounding the metallic layer.
  • the tamping layer fulfills both the function of protection against the propagation of fire and the "proper" tamping function which makes it possible to ensure the formation of a continuous envelope by significantly minimizing or even avoiding the gaps between the outer sheath and insulated electrically conductive elements.
  • the insulated conductor (s) are very easily flammable, and the packing layer makes it possible to ensure optimum protection of the cable in the event of fire.
  • the openings may be slots, longitudinal or at an angle to the axis of the cable, successions of holes aligned on segments parallel to the axis of the cable, or a continuous slot of specific shape.
  • the metallic layer can comprise a metal chosen from copper, and aluminum.
  • the metal layer is also called an "external conductor”.
  • the metal layer preferably has a thickness ranging from 0.1 to 0.3 mm.
  • the electrically insulating layer of the insulated elongated electrically conductive element comprises at least one polyolefin, and in a particularly preferred manner chosen from homopolymers and copolymers of ethylene.
  • the polymeric material of the electrically insulating layer of the insulated elongated electrically conductive element is an expanded polymeric material, such as for example an expanded polyethylene or in the form of a foam.
  • the packing layer is directly in physical contact with the metal layer.
  • the cable further comprises a polymer layer between the metal layer and the packing layer.
  • the packing layer surrounds the polymer layer, and the polymer layer surrounds the metal layer. In this embodiment, the maintenance of the metal layer during the manufacture of the cable is facilitated.
  • the polymer layer can be an electrically insulating layer.
  • the polymer layer comprises a polymer material which can be chosen from polyolefins such as polymers of ethylene and / or propylene.
  • polyolefins such as polymers of ethylene and / or propylene.
  • ethylene polymers that may be mentioned include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), copolymers of ethylene and vinyl acetate (EVA), copolymers of ethylene and butyl acrylate (EBA), methyl acrylate (EMA), 2-hexylethyl acrylate (2HEA), ethylene copolymers and alpha-olefins such as for example polyethylene octene (PEO), copolymers of ethylene and propylene (EPR), or terpolymers of ethylene and propylene (EPT) such as for example terpolymers of ethylene propylene diene monomer (EPDM).
  • LLDPE linear low
  • the cable according to the second variant is preferably a radiating cable.
  • the radiating cable can be installed in areas where radiocommunications are difficult or even impossible. It can be adapted for tunnels (metro, road, rail), buildings (airport, shopping center, commercial building, station, stadium), or on board facilities (train, boat, oil platform).
  • the radiating cable of the invention can make it possible to transmit radio frequency (RF) and microwave frequencies of electromagnetic waves in the form of homogeneous transverse electromagnetic waves (TEM), distributed over their entire length. It can also provide a dual transmission-reception function for said electromagnetic waves and, for example, make the interior of a tunnel or building transparent to the outside.
  • RF radio frequency
  • TEM transverse electromagnetic waves
  • the metal layer is commonly called “external conductor”. It generally has the particularity of having openings or slots, for example arranged in patterns repeated periodically along the cable. Through the openings or slots, controlled levels of electromagnetic energy can radiate outward and inward from the cable. The cable can then function as a long antenna.
  • the expression “geopolymer material” means a solid material comprising silicon (Si), aluminum (AI), oxygen (O) and at least one element chosen from potassium (K) , sodium (Na), lithium (Li), cesium (Cs) and calcium (Ca).
  • the geopolymer material is obtained by curing a geopolymer composition as defined below.
  • Curing takes place by an internal reaction of the polycondensation type or of the hydrothermal type and it is not the result of a simple drying, as is generally the case for binders based on alkali silicates.
  • geopolymer materials result from a mineral polycondensation reaction by alkaline activation, called geosynthesis, as opposed to traditional hydraulic binders in which hardening is the result of hydration of calcium aluminates and calcium silicates.
  • the geopolymer material can be an aluminosilicate geopolymer material.
  • the aluminosilicate geopolymer material can be chosen from the poly (sialates) corresponding to the formula (I) M n (-Si-O-Al-O-) n [(M) -PS], the poly (sialate-siloxos) corresponding in formula (II) M n (-Si-O-Al-O-Si-O-) n [(M) -PPS], the poly (sialate-disiloxos) corresponding to formula (III) M n (- Si-O-Al-O-Si-O-Si-O) n [(M) -PSDS], formulas in which M represents at least one alkaline cation K, Na, Li, Cs or one of their mixtures, and n denotes the degree of polymerization.
  • the Si / Al molar ratio is 1
  • the Si / Al molar ratio is 2
  • in the Si / Al molar ratio is 2
  • the Si / Al molar ratio influences the mechanical properties of the geopolymer material, in particular its properties of resistance to mechanical stress (Young's Modulus).
  • the geopolymer material is chosen from compounds in which the Si / Al molar ratio varies from approximately 1.9 to 6 and even more preferably from approximately 1.9 to 4. The choice of this geopolymer material makes it possible to have a fire-resistant packing layer while being flexible enough to allow the cable according to the invention to be handled without causing cracks within the layer.
  • the geopolymer material represents from 5 to 98% by weight approximately, preferably from 55 to 95% by weight approximately, and more preferably from 65 to 90% by weight approximately, relative to the total weight of the stuffing layer.
  • the geopolymer material is obtained from a geopolymer composition comprising at least one aluminosilicate, an alkaline silicate, water, and optionally an alkaline base.
  • the nonwoven fibrous material preferably has a soft and flexible structure.
  • the nonwoven fibrous material used in the composition of the packing layer according to the invention can be chosen from cellulosic materials, materials based on synthetic organic polymers, glass fibers, and one of their mixtures, and preferably from materials based on synthetic organic polymers.
  • the cellulosic materials can be chosen from paper, in particular blotting paper; nonwoven materials made from functionalized or nonfunctionalized cellulose; matrices with a cellular and / or fibrous structure made from natural fibers of cellulose acetate.
  • the materials based on synthetic organic polymers can be chosen from polymer materials with a porous and / or fibrous matrix of polyolefin (s), in particular those chosen from propylene homo- and copolymers, ethylene homo- and copolymers, high density polyethylenes (HDPE), aromatic polyamides (aramides), polyesters, and one of their mixtures.
  • polyolefin s
  • s polyolefin
  • HDPE high density polyethylenes
  • aromatic polyamides aromatic polyamides
  • polyesters and one of their mixtures.
  • the nonwoven fibrous material is a polyethylene terephthalate (PET).
  • the nonwoven fibrous material preferably has a grammage ranging from 70 to 120 g / cm 2 approximately. This thus makes it possible to obtain a packing layer sufficiently flexible to be able to be handled easily, and sufficiently robust to obtain good protection against fire.
  • the nonwoven fibrous material may in particular be in the form of a strip or a ribbon.
  • the fibrous material represents from 2 to 95% by weight approximately, in a particularly preferred manner from 5 to 45% by weight approximately, and even more preferably from 10 to 35% by weight approximately, relative to the total weight of the packing layer.
  • the packing layer preferably has a thickness ranging from 0.2 to 4 mm approximately, and preferably ranging from 0.5 to 1.5 mm approximately.
  • the packing layer may also comprise at least one additive chosen from organic polymer additives, and agents delaying the setting of the geopolymer composition at room temperature.
  • the organic polymer additive is intended to improve the cohesion of the packing layer and its adhesion to the layer of the cable with which it is intended to be in contact.
  • the organic polymer additive is preferably chosen from polypropylene; styrene-butadiene copolymers (SBR); styrene-butadiene-ethylene copolymers (EBS); derivatives of styrene-ethylene copolymers, in particular those marketed by Kraton such as styrene-ethylene-butylene-styrene copolymers (SEBS), styrene-butadiene-styrene copolymers (SBS), styrene-isoprene-styrene copolymers (SIS), styrene-propylene-ethylene copolymers (EPS) or styrene-ethylene-propylene-styrene copolymers (SEPS); copolymers of ethylene and vinyl acetate (EVA), crosslinked polyorganosiloxanes (e.g. using a peroxide); polyethylene; cellulose and its derivatives such as
  • Cellulose and its derivatives such as cellulose acetate are preferred.
  • the organic polymer additive can be in the form of fibers or a powder.
  • the organic polymer additive preferably represents from 2 to 70% by weight approximately, and even more preferably from 30 to 50% by weight approximately, relative to the total weight of the packing layer, in particular according to the application and the flexibility sought.
  • the caking agent allows the geopolymer composition to remain malleable longer.
  • Such delaying agents can be chosen from ammonium, alkali metals, alkaline earth metals, borax, lignosulfonates and in particular the metal salts of calcium lignosulfonates, celluloses such as carboxymethyl hydroethyl cellulose, lignins sulfoalkylated compounds such as, for example, sulfomethylated lignin, hydroxycarboxylic acids, copolymers of 2-acrylamido-2-methylpropane sulfonic acid salts and of acrylic acid or maleic acid, saturated salts, and mixtures thereof.
  • Lignosulfonates are preferred.
  • the retarding agent preferably represents from 5 to 60% by weight approximately, and even more preferably from 10 to 30% by weight approximately, relative to the total weight of the packing layer.
  • the packing layer does not include any additive (s).
  • it can consist solely, in addition to the inevitable impurities, of the nonwoven fibrous material and of the geopolymer material.
  • the outer sheath is preferably an electrically insulating sheath.
  • the outer sheath is directly in physical contact with the packing layer.
  • the outer sheath is preferably made of a halogen-free material. It can be produced conventionally from materials delaying the propagation of the flame or resistant to the propagation of the flame. In particular, if the latter do not contain halogen, we speak of HFFR cladding (for Anglicism " Halogen Free Flame Retardant ").
  • the outer sheath represents the outermost layer of the cable (i.e. also called the outer protective sheath).
  • the polymer material is chosen from crosslinked and non-crosslinked polymers, polymers of the inorganic type and of the organic type.
  • the polymeric material can be a homo- or a co-polymer having thermoplastic and / or elastomeric properties.
  • the polymers of the inorganic type can be polyorganosiloxanes.
  • the polymers of the organic type can be polyurethanes or polyolefins.
  • the polyolefins can be chosen from polymers of ethylene and propylene.
  • ethylene polymers that may be mentioned include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), copolymers of ethylene and vinyl acetate (EVA), copolymers of ethylene and butyl acrylate (EBA), methyl acrylate (EMA), 2-hexylethyl acrylate (2HEA), ethylene copolymers and alpha-olefins such as for example polyethylene octene (PEO), copolymers of ethylene and propylene (EPR), or terpolymers of ethylene and propylene (EPT) such as for example terpolymers of ethylene propylene diene monomer (EPDM).
  • LLDPE linear low density polyethylene
  • LDPE low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • EVA copolymers of
  • the outer sheath may further comprise a hydrated flame retardant mineral filler.
  • This hydrated flame retardant mineral filler acts mainly by physical means by decomposing in an endothermic manner (eg release of water), which has the consequence of lowering the temperature of the sheath and limiting the spread of flames along the cable.
  • flame retardant properties well known under Anglicism " flame retardant ".
  • the hydrated flame retardant mineral filler can be a metal hydroxide such as magnesium hydroxide or aluminum trihydroxide.
  • the process according to the invention is quick, simple and advantageous from an economic point of view. It provides access to cables with good protection against the spread of fire.
  • the nonwoven fibrous material is in the form of a ribbon or a strip, and step i) of applying said fibrous material is then carried out by winding said ribbon or of said strip around one or more elongated conductive elements, said winding can also be carried out with overlap zones.
  • the application of said nonwoven fibrous material during step ii) is preferably carried out around the plurality of electrically elements insulated elongated conductors to form a nonwoven fibrous material / plurality of insulated elongated electrically conductive elements.
  • the application of the nonwoven fibrous material during step ii) is then preferably longitudinal (i.e. along the longitudinal axis of the cable).
  • the application of said non-woven fibrous material during step ii) is preferably carried out around the metal layer, to form an assembly of non-woven fibrous material / metallic layer / electrically insulated element.
  • the application of the nonwoven fibrous material during step ii) can then be helical or longitudinal, and preferably helical.
  • the geopolymer composition of step ii) is preferably an aluminosilicate geopolymer composition.
  • the geopolymer composition comprises at least one aluminosilicate, an alkali silicate, water, and optionally an alkaline base
  • the aluminosilicate can be chosen from metakaolins (ie calcined kaolins), fly ash (well known under Anglicism " fly ash “), blast furnace slag (well known under Anglicism " blast furnace slag “), swelling clays such as bentonite, calcined clays, any type of compound comprising aluminum and silica fume, zeolites and one of their mixtures.
  • metakaolins are preferred, in particular those marketed by the company Imérys.
  • the alkali silicate can be chosen from sodium silicates, potassium silicates, and one of their mixtures.
  • alkaline silicates sold by the company Silmaco or by the company PQ Corporation are preferred.
  • the alkaline base can be chosen from KOH, NaOH, and their mixture.
  • the geopolymer composition of the invention may comprise from 35% to 80% by weight approximately, and preferably from 40% to 70% by weight approximately, of solid materials (alkali silicate (s), aluminosilicate (s) and alkaline base) , relative to the total weight of said geopolymer composition.
  • solid materials alkali silicate (s), aluminosilicate (s) and alkaline base
  • the mass ratio of solids / water in said geopolymer composition determines the kinetics of solidification during step iv).
  • Step iii) is generally carried out at room temperature (e.g. around 18-25 ° C). Indeed, the polymerization to form the geopolymer material is carried out at room temperature.
  • the curing speed of step iii) can range from approximately 30 to 300 minutes at approximately 25 ° C. (i.e. at room temperature).
  • step iii) by adding to the geopolymer composition at least one caking retardant as defined in the first subject of the invention.
  • the retarding agent is preferably chosen from lignosulfonates.
  • step iv) the external sheath is applied around the layer made up of said fibrous material impregnated with the geopolymer composition.
  • This external sheath can in particular be carried out by extrusion.
  • steps ii), iii) and iv) are concomitant. This allows the cable to be obtained easily and simply.
  • the process can also comprise, before step i), a step i 0 ) of preparing the geopolymer composition.
  • Stage i 0 is generally carried out at a high pH, in particular varying from 10 to 13.
  • the aqueous alkali silicate solution can be prepared by mixing silicon dioxide SiO 2 or an alkali silicate with a MOH base in which M is K or Na.
  • the silicon dioxide SiO 2 can be chosen from silica smoke (ie fumed silica), quartz, and their mixtures.
  • Substep i 01 can be carried out by dissolving the base in water, giving off heat (exothermic reaction), then adding silica (or alkali silicate). The heat released then accelerates the dissolution of the silica (or of the alkaline silicate) during the sub-step i 1 ) and of the aluminosilicate during the sub-step i 02 ) and therefore the setting of the geopolymer composition.
  • the geopolymer composition has a viscosity which increases over time when it is exposed to the open air.
  • the third object of the invention is the use of a packing layer as defined in the first object of the invention, in a data transmission cable such as a radiating cable or a low voltage energy cable.
  • the packing layer comprises a non-woven fibrous material and a geopolymer material impregnating said non-woven fibrous material.
  • the nonwoven fibrous material and the geopolymer material can be as defined in the first subject of the invention.
  • Cable 10 shown in the figure 1 , corresponds to a radiating coaxial cable for typical installations in road or rail tunnels for one- or two-way transmissions in the frequency bands between 40 MHz and 2.7 GHz.
  • This electric cable 10 comprises: an elongated central electrically conductive element 1, preferably made of copper, and successively and coaxially around this elongated central electrically conductive element 1, a layer of expanded polymer 2, preferably of expanded polyethylene, an external electrically conductive element 3 , preferably made of copper and in the form of a perforated longitudinal ribbon cylindrically folded around the layer of expanded polymer 2, a packing layer 4 as defined in the invention, and an external protective sheath 5, preferably comprising at least one thermoplastic material.
  • the electric cable 20, illustrated on the figure 2 also corresponds to a radiating coaxial cable for typical installations in road or rail tunnels for one or two-way transmissions included in the frequency bands between 40 MHz and 2.7 GHz, but provided with an intermediate sheath.
  • This electric cable 20 comprises: an elongated central electrically conductive element 21, preferably made of copper, and successively and coaxially around this elongated central electrically conductive element 21, a layer of expanded polymer 22, preferably of expanded polyethylene, an external electrically conductive element 3 , preferably made of copper and in the form of a perforated longitudinal ribbon and cylindrically folded around the layer of expanded polymer 22, an internal sheath 25, preferably comprising at least thermoplastic material, a packing layer 24 as defined in invention, and an external protective sheath 26, preferably comprising at least one thermoplastic material.
  • Example 1 Preparation of a radiating cable according to the invention
  • An aluminosilicate geopolymer composition was prepared as follows: an alkali silicate solution was prepared by mixing 3 kg of an aqueous sodium silicate solution, 0.1 kg of water and 0.8 kg of hydroxide sodium. Then, 0.9 kg of aluminosilicate was mixed with the alkali silicate solution.
  • Said composition comprises approximately 67% by weight of solid matter, relative to the total mass of said composition.
  • a polyester nonwoven material was then wound around a cable comprising an electrically conductive element made of copper insulated with a layer of expanded polyethylene, said layer of expanded polyethylene being surrounded by a metallic layer of copper (external conductor).
  • the whole was impregnated in the aluminosilicate geopolymer composition as prepared above.
  • the assembly obtained was then covered by hot extrusion with a protective polymer sheath based on an HFFR mixture produced by NEXANS based on polyethylene and flame retardant fillers, said sheath having a thickness of 2 mm.
  • a radiating cable according to the invention was thus obtained.
  • the flame performance of the radiating cable is determined according to standard EN50399. 5 sections of cable positioned on a vertical scale are exposed to a 20kW flame of power for 20 min.
  • the acronym HRR corresponds to the English expression " Heat Release Rate” which provides information on the calorific flow
  • the acronym THR corresponds to the English expression " Total Heat Release” which provides information on the quantity of heat released during of combustion
  • the acronym FIGRA corresponds to the English expression " FIre GRowth rAte” which provides information on the speed of fire growth
  • the acronym SPR corresponds to the English expression " Smoke Production Rate” which provides information on the speed of smoke production
  • the acronym TSP corresponds to the English expression " Total Smoke Production " which provides information on the total amount of smoke produced.

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EP19203499.9A 2018-10-18 2019-10-16 Füllschicht für niederspannungskabel mit verbessertem brandschutz Active EP3640956B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1859630A FR3087574B1 (fr) 2018-10-18 2018-10-18 Couche bourrante pour cable basse tension ayant une protection au feu amelioree

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EP3640956A1 true EP3640956A1 (de) 2020-04-22
EP3640956B1 EP3640956B1 (de) 2022-03-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3828900A1 (de) * 2019-11-29 2021-06-02 Nexans Kabel mit feuerbeständiger schicht
EP4261852A1 (de) * 2022-04-13 2023-10-18 Nexans Material zur lokalen verstärkung oder wiederherstellung der feuerbeständigkeit von elektrischen kabeln

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308111A1 (de) 1987-09-10 1989-03-22 Andrew A.G. Gegen Flammen geschütztes strahlendes Koaxialkabel
FR3049948A1 (fr) * 2016-04-07 2017-10-13 Nexans Couche composite resistante au feu pour cable ou accessoire pour cable
US20170345528A1 (en) * 2014-12-10 2017-11-30 Nexans Cable or cable accessory comprising a fire-resistant layer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3075453B1 (fr) * 2017-12-19 2019-12-13 Nexans Dispositif comprenant un cable ou un accessoire pour cable contenant une couche composite resistante au feu

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308111A1 (de) 1987-09-10 1989-03-22 Andrew A.G. Gegen Flammen geschütztes strahlendes Koaxialkabel
US20170345528A1 (en) * 2014-12-10 2017-11-30 Nexans Cable or cable accessory comprising a fire-resistant layer
FR3049948A1 (fr) * 2016-04-07 2017-10-13 Nexans Couche composite resistante au feu pour cable ou accessoire pour cable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3828900A1 (de) * 2019-11-29 2021-06-02 Nexans Kabel mit feuerbeständiger schicht
EP4261852A1 (de) * 2022-04-13 2023-10-18 Nexans Material zur lokalen verstärkung oder wiederherstellung der feuerbeständigkeit von elektrischen kabeln
FR3134647A1 (fr) * 2022-04-13 2023-10-20 Nexans matériau pour le renforcement local ou la restauration de la résistance au feu de câbles électriques

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Publication number Publication date
FR3087574B1 (fr) 2021-06-25
FR3087574A1 (fr) 2020-04-24
EP3640956B1 (de) 2022-03-02

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