CN109509582B - Low-voltage fire-resistant power cable - Google Patents
Low-voltage fire-resistant power cable Download PDFInfo
- Publication number
- CN109509582B CN109509582B CN201811563906.9A CN201811563906A CN109509582B CN 109509582 B CN109509582 B CN 109509582B CN 201811563906 A CN201811563906 A CN 201811563906A CN 109509582 B CN109509582 B CN 109509582B
- Authority
- CN
- China
- Prior art keywords
- conductor
- fire
- ceramic
- outside
- metal sheath
- 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.)
- Active
Links
- 230000009970 fire resistant effect Effects 0.000 title claims abstract description 34
- 239000004020 conductor Substances 0.000 claims abstract description 47
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 28
- 229910052802 copper Inorganic materials 0.000 claims description 28
- 239000010949 copper Substances 0.000 claims description 28
- 239000000919 ceramic Substances 0.000 claims description 26
- 239000010445 mica Substances 0.000 claims description 18
- 229910052618 mica group Inorganic materials 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 14
- 229920002379 silicone rubber Polymers 0.000 claims description 11
- 239000003365 glass fiber Substances 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 239000004945 silicone rubber Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000000641 cold extrusion Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000003063 flame retardant Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000004014 plasticizer Substances 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 229920005672 polyolefin resin Polymers 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/006—Constructional features relating to the conductors
-
- 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
- H01B7/0283—Disposition of insulation comprising one or more extruded layers of insulation comprising in addition one or more other layers of non-extruded 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
- H01B7/02—Disposition of insulation
- H01B7/0291—Disposition of insulation comprising two or more layers of insulation having different electrical properties
-
- 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
-
- 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
-
- 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
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Insulated Conductors (AREA)
Abstract
The invention relates to a low-voltage fire-resistant power cable, which is characterized in that a heat channel is arranged in the center of a conductor structure, a fire-resistant insulating structure is arranged on the outer surface of the conductor structure, a plurality of the conductor structures are tangentially arranged and fixed by a binding structure, a metal sheath structure is arranged outside the binding structure, an oxygen-insulating fire-resistant structure is arranged on the outer surface of the metal sheath structure, and a filling structure is arranged between the binding structure and the fire-resistant insulating structure outside the conductor structure; in general, the invention has the advantages of reasonable structural design and quick heat dissipation of the cable in a high-temperature state.
Description
Technical Field
The invention belongs to the technical field of wires and cables, and particularly relates to a low-voltage fire-resistant power cable.
Background
When a fire disaster occurs, a large amount of heat energy is generated when a common A-level fireproof cable runs in flame at about 900 ℃, the conduction and dissipation speed is very slow only through a conductor and an outer layer medium, the accumulated heat energy which cannot be diffused shortens the safe service time of the cable under the flame, the direct current resistance of the copper conductor is about 4.5 times that of the copper conductor at about 900 ℃, the self heat productivity of the cable is multiplied in an electrified state, and the current carrying capacity of the cable is finally reduced sharply; therefore, it is necessary to provide a low-voltage fire-resistant power cable which has a reasonable structural design and can quickly dissipate heat in a high-temperature state.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the low-voltage fire-resistant power cable which is reasonable in structural design and fast in heat dissipation under the high-temperature state.
The purpose of the invention is realized in the following way: the utility model provides a low pressure fire-resistant power cable, it includes conductor structure, conductor structure's center be provided with the heat passageway, conductor structure's surface on be provided with fire-resistant insulation structure, many conductor structure tangent setting and fixed by the structure of binding, the outside of binding be provided with metal sheath structure, metal sheath structure's surface be provided with the oxygen isolation fire-resistant structure, the outside fire-resistant insulation structure of binding structure and conductor structure between be provided with filling structure.
The conductor structure is formed by tightly winding copper tubes formed by interlocking annealing soft copper strips with double layers of thickness of 1.0mm and width of 8.0mm and special-shaped copper monofilaments with corresponding sizes outside the copper tubes.
The fireproof insulating structure consists of a mica tape layer with the thickness of 0.2mm wrapped outside the conductor structure and a ceramic silicone rubber layer with the thickness of 1.2mm wrapped outside the mica tape layer.
The mica tape layer is formed by tightly overlapping and wrapping double-sided mica tapes outside the conductor structure, and the overlapping rate of the mica tapes is not lower than 50%.
The ceramic silicone rubber layer is formed by extruding around the mica tape layer in a cold extrusion mode, controlling the extrusion temperature within 30-40 ℃, and then vulcanizing at a high temperature of 160-250 ℃.
The filling structure is a composite rope-shaped filler woven by a ceramic fire-resistant belt and glass fiber yarns in a softened state.
The binding structure is a composite tape formed by pressing ceramic fire-resistant silicon rubber and alkali-free glass fiber cloth at a high temperature.
The metal sheath structure is longitudinally wrapped by copper strips with corresponding widths, an annular groove is pressed by a compression roller after argon arc welding, and the groove depth is 1-2 mm, so that the bending flexibility of the whole cable is ensured.
The oxygen-isolating refractory structure adopts ceramic low-smoke halogen-free polyolefin refractory material, which is plastic mixed by adding ceramic filler, high flame retardant and plasticizer into polyolefin resin, and is extruded and wrapped on the outer surface of the metal sheath structure at the temperature of 110-140 ℃.
The invention has the beneficial effects that: the invention adopts the conductor structure of the combination of the interlocking copper pipe and the special-shaped monofilament, ensures the softness of the conductor under the condition that the dosage of copper materials is not changed, provides a channel for the rapid heat dissipation of the cable at high temperature, and greatly increases the current-carrying capacity of the cable compared with the copper conductor with the same section; the filling structure is a composite rope-shaped filler woven by a ceramic fire-resistant belt and glass fiber yarns in a softened state, and is rapidly hardened into a hard ceramic shell when the temperature of flame or surrounding environment reaches 600 ℃, so that the shell is not melted, dropped or contracted at high temperature, and all power-on circuits can be well isolated without short-circuit accidents; the binding structure is composed of a composite binding belt formed by pressing ceramic fire-resistant silicon rubber and alkali-free glass fiber cloth at a high temperature, the binding belt is wound on a wire core, the composite binding belt is hardened into a hard shell under flame, a certain protection effect can be achieved on the wire core, the ceramic composite binding belt is filled in gaps of each wire core uniformly, and the roundness of the whole cable wire core is guaranteed.
Drawings
Fig. 1 is a schematic cross-sectional view of a low voltage fire-resistant power cable according to the present invention.
In the figure: 1. the heat pipe comprises a heat channel 2, a conductor structure 3, a fire-resistant insulating structure 4, a filling structure 5, a fastening structure 6, a metal sheath structure 7 and an oxygen-insulating fire-resistant structure.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, a low-voltage fire-resistant power cable is provided with a conductor structure 2, a heat channel 1 is arranged in the center of the conductor structure 2, fire-resistant insulation structures 3 are arranged on the outer surface of the conductor structure 2, a plurality of the conductor structures 2 are tangentially arranged and fixed by a fastening structure 5, a metal sheath structure 6 is arranged outside the fastening structure 5, an oxygen-insulating fire-resistant structure 7 is arranged on the outer surface of the metal sheath structure 6, and a filling structure 4 is arranged between the fastening structure 5 and the fire-resistant insulation structures 3 outside the conductor structure 2.
The invention adopts the conductor structure of the combination of the interlocking copper pipe and the special-shaped monofilament, ensures the softness of the conductor under the condition that the dosage of copper materials is not changed, provides a channel for the rapid heat dissipation of the cable at high temperature, and greatly increases the current-carrying capacity of the cable compared with the copper conductor with the same section; in general, the invention has the advantages of reasonable structural design and quick heat dissipation of the cable in a high-temperature state.
Example 2
As shown in fig. 1, a low-voltage fire-resistant power cable is provided with a conductor structure 2, a heat channel 1 is arranged in the center of the conductor structure 2, fire-resistant insulation structures 3 are arranged on the outer surface of the conductor structure 2, a plurality of the conductor structures 2 are tangentially arranged and fixed by a fastening structure 5, a metal sheath structure 6 is arranged outside the fastening structure 5, an oxygen-insulating fire-resistant structure 7 is arranged on the outer surface of the metal sheath structure 6, and a filling structure 4 is arranged between the fastening structure 5 and the fire-resistant insulation structures 3 outside the conductor structure 2; the conductor structure 2 is formed by tightly winding copper tubes formed by interlocking annealing soft copper strips with double layers of thickness of 1.0mm and width of 8.0mm and special-shaped copper monofilaments with corresponding sizes outside the copper tubes; the fireproof insulation structure 3 consists of a mica tape layer with the thickness of 0.2mm wrapped outside the conductor structure and a ceramic silicone rubber layer with the thickness of 1.2mm wrapped outside the mica tape layer; the mica tape layer is formed by tightly overlapping and wrapping double-sided mica tapes outside the conductor structure, and the overlapping rate of the mica tapes is not lower than 50%; the ceramic silicone rubber layer is formed by extruding around the mica tape layer in a cold extrusion mode, controlling the extrusion temperature within 30-40 ℃, and then vulcanizing at a high temperature of 160-250 ℃; the filling structure 4 is a composite rope-shaped filler woven by a ceramic fire-resistant belt and glass fiber yarns in a softened state; the fastening structure 5 is a composite belting formed by pressing ceramic fire-resistant silicon rubber and alkali-free glass fiber cloth at a high temperature; the metal sheath structure 6 is longitudinally wrapped by copper strips with corresponding widths, an annular groove is pressed by a compression roller after argon arc welding, and the groove depth is 1-2 mm, so that the bending flexibility of the whole cable is ensured; the oxygen-isolating refractory structure 7 adopts ceramic low-smoke halogen-free polyolefin refractory material, which is plastic mixed by adding functional additives such as ceramic filler, high flame retardant, plasticizer and the like into polyolefin resin, and is extruded and wrapped on the outer surface of the metal sheath structure at the temperature of 110-140 ℃.
The invention adopts the conductor structure of the combination of the interlocking copper pipe and the special-shaped monofilament, ensures the softness of the conductor under the condition that the dosage of copper materials is not changed, provides a channel for the rapid heat dissipation of the cable at high temperature, and greatly increases the current-carrying capacity of the cable compared with the copper conductor with the same section; the filling structure is a composite rope-shaped filler woven by a ceramic fire-resistant belt and glass fiber yarns in a softened state, and is rapidly hardened into a hard ceramic shell when the temperature of flame or surrounding environment reaches 600 ℃, so that the shell is not melted, dropped or contracted at high temperature, and all power-on circuits can be well isolated without short-circuit accidents; the binding structure is composed of a composite binding belt formed by pressing ceramic fire-resistant silicon rubber and alkali-free glass fiber cloth at a high temperature, the binding belt is wound on a wire core, the composite binding belt is hardened into a hard shell under flame, a certain protection effect can be achieved on the wire core, the ceramic composite binding belt is filled in gaps of each wire core uniformly, and the roundness of the whole cable wire core is guaranteed.
The conductor structures with different specifications are selected from copper pipe outer diameters with different sizes and special-shaped copper monofilament sizes, and specific sizes are selected from the following table:
Claims (1)
1. A low voltage fire resistant power cable comprising a conductor structure, characterized in that: the center of the conductor structure is provided with a heat channel, the outer surface of the conductor structure is provided with a fireproof insulation structure, a plurality of the conductor structures are tangentially arranged and fixed by a binding structure, the outer part of the binding structure is provided with a metal sheath structure, the outer surface of the metal sheath structure is provided with an oxygen-isolation fireproof structure, and a filling structure is arranged between the binding structure and the fireproof insulation structure outside the conductor structure;
the conductor structure is formed by tightly winding copper tubes formed by interlocking annealing soft copper strips with double layers of thickness of 1.0mm and width of 8.0mm and special-shaped copper monofilaments with corresponding sizes outside the copper tubes;
The fireproof insulating structure consists of a mica tape layer with the thickness of 0.2mm wrapped outside the conductor structure and a ceramic silicon rubber layer with the thickness of 1.2mm wrapped outside the mica tape layer in an extrusion mode; the mica tape layer is formed by tightly overlapping and wrapping double-sided mica tapes outside the conductor structure, and the overlapping rate of the mica tapes is not lower than 50%; the ceramic silicone rubber layer is formed by extruding around the mica tape layer in a cold extrusion mode, controlling the extrusion temperature within 30-40 ℃, and then vulcanizing at a high temperature of 160-250 ℃;
the filling structure is a composite rope-shaped filler woven by a ceramic refractory belt and glass fiber yarns in a softened state;
the binding structure is a composite tape formed by pressing ceramic fire-resistant silicon rubber and alkali-free glass fiber cloth at a high temperature;
the metal sheath structure is longitudinally wrapped by copper strips with corresponding widths, an annular groove is pressed by a compression roller after argon arc welding, and the groove depth is 1-2 mm, so that the bending flexibility of the whole cable is ensured;
The oxygen-isolation fireproof structure adopts ceramic low-smoke halogen-free polyolefin fireproof material, which is plastic mixed by adding ceramic filler, high flame retardant and plasticizer into polyolefin resin, and is extruded and wrapped on the outer surface of the metal sheath structure at the temperature of 110-140 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811563906.9A CN109509582B (en) | 2018-12-20 | 2018-12-20 | Low-voltage fire-resistant power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811563906.9A CN109509582B (en) | 2018-12-20 | 2018-12-20 | Low-voltage fire-resistant power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109509582A CN109509582A (en) | 2019-03-22 |
| CN109509582B true CN109509582B (en) | 2024-06-25 |
Family
ID=65753899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811563906.9A Active CN109509582B (en) | 2018-12-20 | 2018-12-20 | Low-voltage fire-resistant power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109509582B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488270A (en) * | 2021-06-30 | 2021-10-08 | 重庆泰山电缆有限公司 | High-current-carrying medium-voltage fire-resistant cable |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208157139U (en) * | 2018-05-09 | 2018-11-27 | 江苏宝安电缆有限公司 | A kind of heat dissipation high-tension cable certainly |
| CN208240384U (en) * | 2018-05-30 | 2018-12-14 | 金杯塔牌电缆有限公司 | High life LSOH anti-flaming ceramic fire-resisting cable |
| CN209691458U (en) * | 2018-12-20 | 2019-11-26 | 河南乐山电缆有限公司 | A kind of low pressure fireproof power cable |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130059771A (en) * | 2011-11-29 | 2013-06-07 | 엘에스전선 주식회사 | Fire resistant cable having mica tape coated silicone |
| CN106782856A (en) * | 2016-12-27 | 2017-05-31 | 北京天成瑞源电缆有限公司 | Times capacity midium voltage cable |
-
2018
- 2018-12-20 CN CN201811563906.9A patent/CN109509582B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208157139U (en) * | 2018-05-09 | 2018-11-27 | 江苏宝安电缆有限公司 | A kind of heat dissipation high-tension cable certainly |
| CN208240384U (en) * | 2018-05-30 | 2018-12-14 | 金杯塔牌电缆有限公司 | High life LSOH anti-flaming ceramic fire-resisting cable |
| CN209691458U (en) * | 2018-12-20 | 2019-11-26 | 河南乐山电缆有限公司 | A kind of low pressure fireproof power cable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109509582A (en) | 2019-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109448921B (en) | Manufacturing method of inorganic fireproof medium-high voltage cable | |
| CN102938272B (en) | Production method for fire-resistant middle-high voltage cables | |
| CN102938275A (en) | Production method of fireproof middle and high voltage cables | |
| CN202948763U (en) | Safe fire-resistant medium and high voltage cable | |
| CN112038001A (en) | Manufacturing method of single-phase alternating current fireproof high-voltage cable for railway engineering | |
| CN103606405B (en) | Fireproof cable and production method thereof is pressed in 35kV and following novel environment-friendly | |
| CN102938276A (en) | Manufacturing method of safety fire-resistant medium and high voltage cables | |
| CN204087894U (en) | Fire-retardant fire insulation midium voltage cable | |
| CN102760526B (en) | Ceramic silicon rubber insulation medium-voltage fire-resistant cable with rated voltage of 6kV-35kV and machining process thereof | |
| CN115171968B (en) | High-efficiency energy-saving medium-voltage fireproof cable | |
| CN211529645U (en) | Super flexible mineral substance fireproof cable | |
| CN110136892A (en) | A kind of ceramic polyolefin fire prevention midium voltage cable manufacturing method | |
| CN104240832A (en) | Novel flame-retardant fireproof cable | |
| CN109509582B (en) | Low-voltage fire-resistant power cable | |
| CN103811118A (en) | Medium voltage fire resistant cable for airport terminal | |
| CN203706730U (en) | High-flame-retardant low smoke halogen-free medium-voltage fire resisting cable | |
| CN210110364U (en) | Mica tape mineral insulation fireproof cable | |
| CN202093880U (en) | Heat-resisting and shielding type power cable used for nuclear power station | |
| CN204102616U (en) | A kind of novel flame-retardant fireproof cable | |
| CN208722584U (en) | Energy-saving fire proof power cable | |
| CN218513193U (en) | Long-life flame-retardant B1-grade halogen-free low-smoke low-voltage power cable | |
| CN105976913A (en) | Improved-type medium-voltage fireproof power cable | |
| CN209691458U (en) | A kind of low pressure fireproof power cable | |
| CN104078158A (en) | Special medium-voltage fire-resistant cable | |
| CN209912597U (en) | Ultraviolet irradiation resistant nuclear-grade lighting cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |