KR20120132418A - A fire resistant cable - Google Patents

Abstract

PURPOSE: A fire resistance cable is provided to easily maintain circuit integrity on exposure to an elevated temperature by including a fire resistance layer forming a cohesive shell. CONSTITUTION: A fire resistant cable(1.002) includes a fire resistant layer(1.004) which forms a cohesive shell. The cable includes one or more conductors(1.006) made from a material having a melting temperature less than the melting temperature of copper. The conductor is an aluminum conductor or an aluminum alloy conductor. The fire resistant layer includes a material which forms a ceramic on exposure to elevated temperature. The fire resistant layer partially contains electrical insulation after exposure to elevated temperature.

Description

Fire Resistant Cable {A FIRE RESISTANT CABLE}

The present invention relates to a fire resistant cable.

Fire-resistant cables must be able to maintain electrical conductivity even after being placed in flames. To maintain electrical conductivity, the conductor must have mechanical persistence and electrical conductivity, the insulating material must have sufficient insulating properties to prevent shorting between conductors, and sufficient mechanical adhesion to maintain the layer on the conductor. Should be.

Since the melting point of aluminum is about 660 ° C, it is not recommended to use aluminum in fire resistant cables to maintain the mechanical durability of the conductor. Therefore, as the fire resistant cable, it is more common to use copper having a melting point of 1083 ° C. Copper has a melting point of about 1083 ° C. Aluminum melts at approximately 660 ° C., a much lower temperature. Fire resistant cables can be expected to maintain circuit integrity up to about 1000 ° C. On the surface, aluminum would not be suitable for use as a conductor of the fire resistant cable.

US 20080124544 discloses a refractory copper cable having an outer layer that forms a ceramic layer when exposed to a flame. Low melting point glazes are inserted between the ceramic shell and the copper conductor to reduce the cooling thermal stress between the copper conductor and the ceramic after firing.

JP63192895 discloses a process of forming a ceramic film on a metallic member by first forming an anodized layer on the metallic member in a sulfuric acid solution and then applying the ceramic coating by vapor deposition.

It is an object of the present invention to provide at least one conductor made of a refractory cable and a non-copper material having a fire resistant layer which forms a tacky sheath so as to maintain circuit preservation when exposed to high temperatures.

“High temperature” means a temperature usually specified for a fire resistant cable, typically from about 650 ° C. to about 1000 ° C. However, it is within the scope of the present invention to form the tacky sheath described herein at temperatures outside the above-mentioned range.

In accordance with an embodiment of the present invention, the present invention provides a fire resistant cable (1.002) having a fire resistant layer (1.004) and a one or more conductors (1.006) made of non-copper material having a fire resistant layer (1.004) when exposed to high temperatures. do.

The conductor may be an aluminum conductor or an aluminum alloy conductor.

In a particular embodiment where the conductor is an aluminum conductor or an aluminum alloy conductor, the conductor is not subject to any oxidation step, such as anodizing, to form an alumina layer before it is insulated by the fire resistant layer.

The cable may comprise a wire that distinguishes the materials.

The wire may comprise a tension wire.

The cable may comprise one or more steel wires.

The fireproof layer may be an external fireproof layer.

The fireproof layer may be an inner layer.

The cable may be capable of maintaining circuit integrity at temperatures above 1000 ° C., where the conductor may have a melting point lower than the temperature required or specified for the cable.

The fire resistant layer may comprise a material that forms a ceramic when exposed to high temperatures.

The fire resistant layer may at least partially retain electrical insulation after exposure to high temperatures.

The cable may include an additional layer 2.008 that provides electrical insulation after exposure to flame.

The fire resistant layer for forming a ceramic under fire conditions includes: at least 10 wt% mineral silicate; 8% to 40% by weight of one or more inorganic phosphates, which form a liquid phase at a temperature below 800 ° C. and are selected from ammonium phosphate, ammonium polyphosphate and ammonium pyrophosphate; And at least 15 wt% of a polymer base composition comprising at least 50 wt% of an organic polymer based on the total weight of the composition. The composition essentially lacks a charring agent that provides intumescence with the inorganic phosphate; Wherein the composition forms a self-supporting ceramic residue when exposed to a temperature of 1000 ° C. for 30 minutes, the self-supporting ceramic residue comprising at least 40% by weight of the composition prior to pyrolysis.

The amount of mineral silicate is present at at least 15% by weight of the total amount of the composition.

The composition may further comprise an inorganic filler comprising at least one compound selected from the group consisting of magnesium hydroxide, alumina trihydrate, magnesium carbonate and calcium carbonate and the amount of the composition is from 5 to 20 weight of the total amount of the ceramic composition. Exists in%

The composition may comprise calcium carbonate in an amount of 5 to 20% by weight of the total amount of ceramized composition.

There may be one or more conductors and one or more insulating layers in the composition.

The cable may have a single insulating layer near the conductor.

The ceramized single insulating layer may have an inner surface adjacent to the conductor and the free outer surface.

The single insulating layer can have an outer surface without a coating.

A single insulating layer can form a self-supporting ceramic when exposed to temperatures encountered under firing conditions.

Ammonium polyphosphate as inorganic phosphate may be present in an amount ranging from 8 to 20% by weight of the total amount of ceramized composition.

The cable may comprise one or more non-aluminum wires or conductors.

The fire resistant layer can be made of a material comprising: at least 15 wt% of a polymer base composition comprising at least 50 wt% of an organic polymer based on the total weight of the composition; At least 15% by weight silicate mineral filler based on the total weight of the composition; And optionally at least one molten oxide raw material present in the silicate mineral filler, wherein the molten oxide is present in an amount of 1 to 15% by weight of the residue after exposure to the high temperatures encountered under firing conditions.

The silicate mineral filler may be present in an amount of at least 25% by weight based on the total weight of the composition.

Molten oxide may be present in the residue in an amount of 1 to 10% by weight after exposure to the high temperature.

Molten oxide may be present in the residue in an amount of 2 to 8% by weight of the residue after exposure to the high temperature.

The weight of the residue after firing may be at least 40% by weight of the fire resistant composition.

The composition may form a self-supporting structure when heated to the high temperatures encountered under firing conditions.

The molten oxide may comprise one or more molten oxides selected from the group consisting of:

Molten oxides produced by silicate mineral fillers heated to high temperatures,

Conventional molten oxides, and

A precursor which forms a molten oxide by thermal decomposition of said precursor.

Conventional molten oxides may include one or more boron oxides or one metal oxide selected from lithium, potassium, sodium, phosphorus and vanadium.

Molten oxides can be produced by heating certain silicate mineral fillers (eg, mica), can be added independently or can be included in the compositions of the present invention, and the precursors of molten oxides (eg metal hydroxides or metals) Metal carbonate precursors to oxides, ie compounds produce molten oxide after exposure to high temperature conditions similar to when placed in flames.

The molten oxide precursor may comprise one or more materials selected from the group consisting of borate salts, metal hydroxides, metal carbonates and glass.

The molten oxide added or derived from the precursor may comprise one or more oxides of elements selected from the group consisting of lead, antimony, boron, lithium, potassium, sodium, phosphorus and vanadium.

The organic polymer may be selected from the group consisting of thermoplastic polymers, thermosetting polymers and elastomers.

Organic polymers include one or more homopolymers, copolymers, elastomers or resins, polyolefins, ethylene-propylene rubbers, ethylene-propylene terpolymer rubbers (EPDM), chlorosulfonated polyethylenes and chlorinated polyethylenes, vinyl polymers, Acrylic and methacrylic polymers, polyamides, polyesters, polyimides, polyoxymethylene acetals, polycarbonates, polyurethanes, raw rubbers, butyl rubbers, nitrile-butadiene rubbers, epichlorohydrin rubbers, polychloroprene, styrene polymers, styrene Butadiene, styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-ethylene-butadiene-styrene, epoxy resins, polyester resins, vinyl ester resins, phenolic resins and melamine formaldehyde resins.

The polymer base composition may comprise 15 to 75 wt% of the prepared fire resistant composition.

The silicate mineral filler may comprise one or more selected from the group consisting of alumino-silicates, alkali alumino-silicates, magnesium silicates and calcium silicates.

The fire resistant composition is selected from the group consisting of silicon dioxide and inorganic fillers which produce one or more oxides of these inorganic fillers when the metal oxides and inorganic fillers of aluminum, calcium, magnesium, zircon, zinc, iron, tin and barium are thermally decomposed. It may further comprise an inorganic filler.

The polymer base composition may comprise a silicone polymer.

The weight ratio of organic polymer to silicone polymer may be in the range of 5: 1 to 2: 1.

The fire resistant composition may comprise from 2 to 15% by weight of the total amount of the fire resistant composition prepared in the amount of the silicone polymer.

The high temperature which has undergone the firing conditions for 30 minutes may be 1000 ° C.

The composition is 20 to 75% by weight of the polymer base composition is a silicone polymer; May comprise at least 15% by weight of the inorganic filler comprising mica and glass additives; The molten oxide in the residue is derived from glass and mica, where the ratio of mica to glass is in the range of 20: 1 to 2: 1.

The polymer base composition comprises an organic polymer and a silicone polymer in a weight ratio of 5: 1 to 2: 1; The inorganic filler may further comprise 10 to 30% by weight of mica of the total weight of the composition and 20 to 40% by weight of inorganic filler of the total weight of the composition.

Molten oxide may be present in the residue in an amount greater than 5% by weight of the residue, the molten oxide forming a glassy coating on the ceramic that is formed when exposed to a flame, the glassy coating passing through water and gas. It forms a barrier layer that is enhanced when resistant.

The cable may be of a suitable structure.

The cable may be a twisted pair cable (3.010).

The cable may be a parallel wire cable.

The cable may be a multi-conductor cable.

The cable may be of a multi-pair structure.

DETAILED DESCRIPTION Embodiments or embodiments of the present invention will now be described with reference to the accompanying drawings, which description is by way of illustration only:
1 shows a cross-sectional view of a fire resistant cable according to a first embodiment of the invention.
2 shows a cross-sectional view of a fire resistant cable according to a second embodiment of the invention.
3 shows a portion of a twisted pair cable according to an embodiment of the invention.
4 shows a cross-sectional view of a cable according to another embodiment of the present invention.
Among the numbers used in the drawings, the numbers before the periods indicate the drawing numbers, and the numbers after the periods are the numbers for component reference. The same component reference numerals in different drawings may indicate corresponding components.
The orientation in the drawings is for the purpose of illustrating the features of the embodiments of the invention and should not be regarded as limiting to the orientation of the invention in use.
The drawings are intended to illustrate features of the described embodiments and are not necessarily drawn to scale.

The present invention will be described only as a reference of the embodiments for describing the accompanying drawings.

1 shows a cross-sectional view of a cable 1.002 having an insulating fireproof layer or jacket 1.004 surrounding conductor 1.006. The fire resistant layer may be made of a material that forms a tacky residue when exposed to high temperatures that may be experienced in a flame.

The fire resistant layer may be made of a ceramicization material which forms a ceramic when exposed to high temperatures.

Document WO2005 / 095545, incorporated herein by reference, describes a composition suitable for use as a fireproof layer.

Example  One

Two-roll mills were used to prepare the compositions represented by A, B, C and D in Table 1. In each case, the ethylene-propylene (EP) polymer was banded in a mill (10-20 ° C.) and other components were added and the band of material was added just before the band of material passed through the nips of the two rolls. Separation and recombination allow components to be dispersed. When the components were uniformly dispersed, peroxide was added and dispersed in a similar manner.

By curing and molding at 170 ° C. for 30 minutes under a pressure of about 7 MPa, a flat rectangular sheet about 1.7 mm thick was made from the processed composition.

Rectangular sheet swatches having a size of about 30 mm x 13 mm x 1.7 mm were cut from the molded sheet and heated to 1000 ° C. at room temperature at 1000 ° C. for 30 minutes after slow firing conditions (12 ° C./min temperature increase rate). Holding conditions) or firing under rapid firing conditions (the conditions in which the sheet was placed in a preheated furnace at 1000 ° C. for 30 minutes). After firing, each sample turned into a ceramic form. The change in length caused by firing was determined by measuring the length of the specimen before and after firing. The expansion of the specimen caused by firing is recorded as a positive change in length, and shrinkage (atrophy) is recorded as a negative change in length.

Compositions A, B, C and D                                                                                              Composition (% by weight) A B C D EP polymer 18 18 18 18 EVA polymer 4.5 4.5 4.5 4.5 Ammonium polyphosphate 27 27 27 27 Talc 25 40 25 Mica 25 Alumina Trihydrate 15 15 Magnesium hydroxide 15 Other additives (stabilizers, adjuvants, paraffinic oils) 8 8 8 8 peroxide 2.5 2.5 2.5 2.5 Total amount: 100 100 100 100 Firing conditions Slow speed Slow Slow Slow % Change in length when ceramicized -2.9 2.0 0.2 6.7 -2.1

At a flame of 1000 ° C., compositions A, B, C and D are transformed into hard and strong ceramics that retain their initial shape with minimal change in size.

Example  2

This example tests the properties of the composition indicated by "E" in Table 2. In this example, the EP polymer was banded in a mill (40-50 ° C.) and the other components were added just before the band of material passed through the nips of the two rolls and the components were separated and recombined. Make them distributed. When the components were uniformly dispersed, peroxide was added and dispersed in a similar manner.

By curing and molding at 170 ° C. for 30 minutes under a pressure of about 7 MPa, a flat rectangular sheet about 1.7 mm thick was made from the processed composition.

Rectangular sheet swatches having a size of about 30 mm x 13 mm x 1.7 mm were cut from the molded sheet and fired under rapid firing conditions (addition to the furnace maintained at 1000 ° C. and maintained at 1000 ° C. for 30 minutes). . After firing, the sample turned into a ceramic form. It could be visually confirmed that composition "E" forms a ceramic residue that retains its original size. Tests made under slow firing conditions showed that composition "E" self-supported. Composition "E" showed net shape retention (excellent dimensional stability).

Composition E weight % EP Polymer 18.50 EVA Polymer 4.70 ammonium Polyphosphate 13.50 Talc 20.00 clay 7.50 Alumina Trihydrate 15.00 calcium Carbonate 7.50 Process oil 5.80 Coupling agent 1.00 Processing aid 2.50 Stabilizer 1.40 peroxide 2.60 Total amount:  100.00

Example  3:

This example relates to the preparation of the thermoplastic composition according to the invention. The compositions of Table 3 were prepared:

Thermoplastic Composition G Composition H TPV EPDM weight % weight % TPV 29.8 EPDM 30 ammonium Flip-phosphate 28.0 28.2 Alumina Trihydrate 15.60 15.70 Talc 25.9 26.1 Processing aid 0.7 0 Total amount:  100.00  100.00

Compositions G and H in Table 3 were prepared by mixing the polymer with each filler and additive combination using a Haake Record Batch Mixer.

Composition G was based on thermoplastic vulcanizates (TPV, Santoprene 591-73) with calcium stearate and paraffin, which were premixed with TPV pellets and fillers, respectively, to be used as processing aids, and then mixed in the same way for polystyrene compositions. .

Composition H was based on ethylene propylene diene polymer (Nordel 3745). Composition H was not crosslinked. Unlike composition G, composition H was mixed at 1700 ° C.

A 3 mm thick plaque was compression molded from the compositions at 155-180 ° C. for about 10 minutes under a pressure of about 10 MPa. The specimens were then cut from the plaques. One set of specimens was fired at slow firing conditions and tested as described above. The two compositions based on thermoplastics produced self-supporting ceramics having a length change of less than 10% and a flexural strength of greater than 0.3 MPa after slow firing.

Suitable compositions for the tacky layer include at least 15% by weight polymer based composition comprising at least 50% by weight organic polymer, based on the total weight of the composition; At least 15% by weight silicate mineral filler based on the total weight of the composition; And optionally one or more molten oxide raw materials present in the silicate mineral filler, wherein after being exposed to elevated temperatures via firing conditions, the molten oxide is present in an amount of 1 to 15% by weight of the residue.

The silicate mineral filler may be present in an amount of at least 25% by weight based on the total weight of the composition.

Molten oxide may be present in the residue in an amount of 1 to 10% by weight after exposure to the high temperature.

Molten oxide may be present in the residue in an amount of 2 to 8% by weight after exposure to the high temperature.

The weight of the residue after firing may be at least 40% by weight of the fire resistant composition.

additional Example :

The specification of WO2004 / 035711, incorporated by reference herein, describes a composition that may be suitable for use as a fireproof layer. In this embodiment the composition may form a self-supporting structure when heated to high temperatures while undergoing firing conditions.

Molten oxide can be produced from the silicate mineral filler when heated to an elevated temperature.

The molten oxide precursor may comprise one or more materials selected from the group consisting of boron, metal hydroxides, metal carbonates and glass.

The molten oxide added or produced from the precursor may comprise one or more oxides of an element selected from the group consisting of lead, tin, boron, lithium, potassium, sodium, phosphorus and vanadium.

The organic polymer can be selected from the group of thermoplastic plastic polymers, thermosetting polymers and elastomers.

Organic polymers are homopolymers, copolymers, elastomers or resins of one or more polyolefins, ethylene-propylene rubbers, ethylene-propylene terpolymer rubbers (EPDM), chlorosulfonated polyethylene and chlorinated polyethylene, vinyl polymers, acrylics and meta Krillic polymers, polyamides, polyesters, polyimides, polyoxymethylene acetals, polycarbonates, Polyurethane, raw rubber, butyl rubber, nitrile-butadiene rubber, epichlorohydrin rubber, polychloroprene, styrene polymer, styrene-butadiene, styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-ethylene-butadiene-styrene, epoxy Resins, polyester resins, vinyl ester resins, phenolic resins and melamine formaldehyde resins.

The polymer base composition may comprise 15 to 75 wt% of the prepared fire resistant composition.

The silicate mineral filler may comprise one or more selected from the group consisting of alumino-silicates, alkali alumino-silicates, magnesium silicates and calcium silicates.

The fire resistant composition is an inorganic filler selected from the group consisting of silicon dioxide and metal oxides of aluminum, calcium, magnesium, zircon, zinc, iron, tin and barium, and an inorganic filler that produces one or more of these oxides when thermally decomposed. It may further include.

The polymer base composition may comprise a silicone polymer.

The weight ratio of organic polymer to silicone polymer may be in the range of 5: 1 to 2: 1.

The fire resistant composition may comprise a silicone polymer in an amount of 2 to 15 weight percent based on the total amount of the fire resistant composition prepared.

The high temperature under the firing conditions may be 1000 ° C. for 30 minutes.

The composition is 20 to 75% by weight of the polymer base composition is a silicone polymer; At least 15% by weight of the inorganic filler including the mica and the glass additive; And molten oxide in the residue produced from the glass, the mica having a mica: glass ratio of 20: 1 to 2: 1.

The polymer base composition comprises an organic polymer and a silicone polymer in a weight ratio of 5: 1 to 2: 1; The inorganic filler may further comprise 10 to 30% by weight of mica of the total weight and 20 to 40% by weight of the inorganic filler of the total weight.

Molten oxide can be present in the residue in an amount greater than 5% by weight of the residue, the molten oxide forming a glassy coating on the ceramic that is formed when exposed to a flame, the glassy coating through which water and gas will pass. When forming a barrier layer that increases resistance.

When the amount of the composition is at a maximum, it is affected by the processability of the composition. Too much filler can make it difficult to form a mixed composition. Typically, the maximum value of the silicate mineral filler is about 80% by weight. The amount and type of silicate minerals used will also be influenced by the conditions required to have a specific range of molten oxide formed by heating the composition at high temperatures of firing conditions in the residue.

Molten oxides can be produced in situ at elevated temperatures by heating certain types of silicate mineral fillers (eg Mica) and can be used at the surface of the filler particles to produce molten oxides. Additionally or alternatively, the molten oxide may be derived from raw materials other than silicate mineral fillers. As explained below, the molten oxide appears to act as a "sticker" to assist in the formation of the bonded product at high temperatures. Molten oxide appears to contribute to bonding the flux at the edge of the filler particles. High presence of silicate mineral fillers can result in little shrinkage and cracking of the composition when the ceramic is formed at elevated temperatures and when the ceramic is cooled.

The molten oxide can be boron dioxide or a metal oxide selected from oxides of lithium, potassium, sodium, phosphorus and vanadium.

Molten oxides can be produced by heating certain silicate minerals (eg Mica), certain silicate minerals can be added independently or included in the compositions of the present invention, and the precursors of molten oxides (such as metal hydroxides or metal oxides) Metal carbonate precursors) are compounds that produce molten oxide after exposure to high temperatures similar to those undergoing firing.

The central portion may be a conductor having a lower melting point than copper.

The central portion may be a conductor having a melting point lower than the temperature specified for the circuit integrity of the cable or specified for the circuit integrity of the cable.

The central conductor may be aluminum or an aluminum alloy.

An additional embodiment shown in FIG. 2 shows that an interlayer 2.008 is applied between the conductor 2.006 and the jacket 2.004. Jacket 2.004 forms an adhesive layer when exposed to rising temperatures.

The intermediate layer 2.008 may be a buffer layer to reduce the interaction between the conductor and the fireproof layer.

The intermediate layer may be an insulating layer that retains insulating properties after exposure to rising temperatures.

3 shows a twisted pair cable having a first insulated cable 3.010 intertwined with a second insulated cable 3.012. The cable 3.010 has an aluminum or aluminum alloy conductor 3.003 and an insulating fireproof layer 3.004. The fire resistant layer 3.004 may be made of a ceramic material. The conductor 3.012 may have the same structure as the cable 3.010.

4 shows a cross-sectional view of a cable according to a further embodiment of the present invention, where the first ceramic fireproof layer 4.004 covers the conductor 4.006 and the second ceramic fireproof layer covers the first ceramic fireproof layer. The second layer can be provided to improve the high temperature insulation properties of the cable.

The aluminum conductors in the stranded cable were tested by exposing them to temperatures above 1000 ° C., and the results showed that the cables continued to retain effective insulation at these elevated temperatures. The insulating fireproof layer was made of a material that forms a tacky jacket after exposure to high temperatures. The tacky jacket possessed sufficient insulating properties to provide effective insulation after exposure to high temperatures.

Samples of the cable were tested at 800 ° C. and 1000 ° C. for 30 minutes. When tested on aluminum cable for 45 minutes at 1000 ° C., the molten conductor flowed from the end of the cable when taken out of the furnace, but the integrity of the conductor was maintained in the ceramic fireproof layer.

This surprising result of this experiment is that conductors having a melting point lower than high temperature can be used in a fire resistant cable with an insulating fire layer and the insulating fire layer forms a sticky insulating jacket when exposed to flame.

In particular, aluminum and their alloys are suitable for use in the fire resistant cable. Aluminum forms a surface layer of Al ₂ O ₃ when exposed to air. Since Al ₂ O ₃ has a very high melting point of 2072 ° C., the Al ₂ O ₃ surface does not melt at the temperatures specified for the circuit integrity of the cable or required for circuit integrity. Thus, above the melting point of aluminum or aluminum alloy, the inside of the conductor will be a molten metal, which will be included in the solid surface of Al ₂ O ₃ . In addition, Al ₂ O ₃ has a low thermal conductivity and lowers the heat transfer rate to the inside of the aluminum or aluminum alloy wire. Thus, the conductor is heated at a slower rate than when there is no Al ₂ O ₃ layer.

Aluminum alloys can be used for this purpose. The readily available aluminum alloy is a 1120 alloy with better strength and creep resistance than pure aluminum.

Aluminum forms Al ₂ O ₃ layers or surfaces in air. The ceramming composition can be extruded from untreated aluminum or aluminum alloy conductors. The present invention does not require an anodizing process or a vapor deposition process as described in JP63192895.

Although reference is made herein to the reference, disclosure, or other publication or use of a document, unless otherwise stated, the technical field to which the present invention pertains is based on the priority date of the present specification because of the expression document, disclosure, publication or use. It does not mean that the general knowledge that those skilled in the art have.

In this specification, terms indicating orientation or direction, that is, "up", "down", "vertical", "horizontal", "left", "right", "vertically", "horizontal", etc. It is not intended in absolute terms unless otherwise indicated or otherwise indicated.

Wherever the term is used, the term "including" should be understood to mean "open", that is, not limited to the closed meaning of "consisting only of." The same applies to expressions corresponding to "includes" and "included."

It is to be understood that the invention disclosed and defined herein extends to selectable combinations of two or more of the individual features mentioned or indicated in the context.

Although specific embodiments have been described in connection with the present invention, it will be apparent to those skilled in the art that the present invention may be embodied in other forms without departing from the essential features of the present invention. Accordingly, the embodiments and embodiments of the present invention are intended to illustrate specific examples in all respects and are not limited thereto, and thus, all operations obvious to those skilled in the art are included herein.

Claims (17)

In a fire resistant cable (1.002) having a fire resistant layer (1.004) which forms a tacky sheath when exposed to high temperatures, the cable is at least one conductor (1.006) made of a material having a melting temperature lower than the melting temperature of copper Cable comprising a. The method of claim 1,
And the conductor is an aluminum conductor or an aluminum alloy conductor. The method according to claim 1 or 2,
And wherein the fire resistant layer comprises a material which forms a ceramic when exposed to high temperatures. 4. The method according to any one of claims 1 to 3,
And wherein the fire resistant layer at least partially contains electrical insulation after exposure to high temperatures. 5. The method according to any one of claims 1 to 4,
Wherein the cable comprises an additional layer (2.008) having electrical insulation after exposure to flame. The method of claim 5,
The additional layer is located between the fireproof layer and the conductor. 7. The method according to any one of claims 1 to 6,
The fire resistant layer for forming a ceramic under firing conditions,
At least 10% by weight mineral silicate; 8% to 40% by weight of one or more inorganic phosphates, which form a liquid phase at a temperature below 800 ° C. and are selected from ammonium phosphate, ammonium polyphosphate and ammonium pyrophosphate; And at least 15 wt% of a polymer base composition comprising at least 50 wt% of an organic polymer based on the total weight of the composition,
The composition is essentially devoid of carbonizing agents that provide avidity with the inorganic phosphate; Wherein the composition forms a self-supporting ceramic residue when exposed to a temperature of 1000 ° C. for 30 minutes, the self-supporting ceramic residue comprising at least 40% by weight of the composition prior to pyrolysis. The method of claim 7, wherein
Wherein said mineral silicate is present in an amount of at least 15% by weight of the total composition. 9. The method according to claim 7 or 8,
The composition further comprises an inorganic filler, the inorganic filler comprising at least one compound selected from the group consisting of magnesium hydroxide, alumina trihydrate, magnesium carbonate and calcium carbonate, the amount of the composition being a total amount of the ceramic composition Cable, characterized in that 5 to 20% by weight. 10. The method according to any one of claims 7 to 9,
Wherein said composition comprises calcium carbonate in an amount of from 5 to 20% by weight of the total amount of ceramized composition. 11. The method according to any one of claims 1 to 10,
A cable characterized by having at least one conductor and at least one insulating layer. 12. The method according to any one of claims 1 to 11,
And the cable has a single insulating layer surrounding the conductor. 13. The method according to claim 11 or 12,
And wherein the ceramic single insulation layer has an inner surface adjacent to the conductor and the free outer surface. The method of claim 13,
Wherein said single insulating layer has an outer surface free of coating. 15. The method according to any one of claims 11 to 14,
Wherein said single insulating layer forms a self-supporting ceramic when exposed to temperatures produced under firing conditions. The method according to any one of claims 7 to 15,
The amount of ammonium polyphosphate as inorganic phosphate is 8 to 20% by weight of the total amount of ceramization composition. 17. The method according to any one of claims 1 to 16,
A cable comprising at least one non-aluminum wire or conductor.

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