GB2050041A - Fire resistant cable - Google Patents
Fire resistant cable Download PDFInfo
- Publication number
- GB2050041A GB2050041A GB7918768A GB7918768A GB2050041A GB 2050041 A GB2050041 A GB 2050041A GB 7918768 A GB7918768 A GB 7918768A GB 7918768 A GB7918768 A GB 7918768A GB 2050041 A GB2050041 A GB 2050041A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- cable
- laminate
- earth wire
- polymeric composition
- 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.)
- Granted
Links
- 230000009970 fire resistant effect Effects 0.000 title claims description 5
- 239000004020 conductor Substances 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 229920001971 elastomer Polymers 0.000 claims abstract description 15
- 229910010272 inorganic material Inorganic materials 0.000 claims abstract description 12
- 239000011147 inorganic material Substances 0.000 claims abstract description 12
- 239000010445 mica Substances 0.000 claims abstract description 12
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims abstract description 11
- 239000011888 foil Substances 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 239000004744 fabric Substances 0.000 claims abstract description 7
- 239000011521 glass Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 7
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 7
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims abstract description 3
- 239000000806 elastomer Substances 0.000 claims description 10
- 239000003063 flame retardant Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229920005549 butyl rubber Polymers 0.000 claims description 4
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 4
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 2
- 239000005030 aluminium foil Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000011889 copper foil Substances 0.000 claims description 2
- 230000006866 deterioration Effects 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 239000011368 organic material Substances 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 claims description 2
- 239000004945 silicone rubber Substances 0.000 claims description 2
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—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
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
Landscapes
- Insulated Conductors (AREA)
Abstract
In a multi-core electric cable, each conductor is provided with a layer of inorganic material (for example comprising tapes of sheet material consisting of mica paper supported on an open weave glass fabric) which forms a carbon-free insulating layer on combustion, and further with a layer of elastomer- based insulating compound (for example ethylene-propylene based rubber) over the inorganic- material layer. The conductors, together with a bare earth wire, are enclosed within a sheath comprising a laminate of thermoplastic polymeric composition/metal foil and an extruded sheathing of a polymeric composition around the laminate, the metal layer of the laminate facing inwards and contacting the earth wire throughout the cable length. On exposure to fire, the ethylene propylene rubber is destroyed but the mica paper remains intact to maintain adequate electrical resistance between the conductors.
Description
SPECIFICATION
Fire resistant cable
This invention relates to an electric cable having good fire resistant properties.
This invention is a modification of or improvement in the invention which is the subject of our British patent 1 500 1 21.
Our British patent 1 500 121 describes and claims a multi-core electric cable, which comprises two or more electric conductors, each of which is insulated with a coating of silicone rubber insulation, a bare earth wire, and a sheath consisting of a laminate of a thermoplastic polymeric composition/aluminium or copper foil and an extruded sheathing of a fire retardant polymeric composition around the laminate, the sheath enclosing the insulated conductors and the earth wire with the metal layer of the laminate on the inside and in contact with the earth wire throughout the length of the cable. Such cable construction is suitable for cables in which the cross-sectional area of each conductor is up to 4 square millimetres and which comprises from 2 to 1 9 separate conductors.By way of example, such cable may be used for 2 and 5 pair 0.5 mm2 telephone and signal cables for use in high fire risk areas, such as in power stations, and is suitable for surface mounting.
The present invention provides a multi-core electric cable, which comprises two or more electric conductors, each provided with a layer of an inorganic material which forms a carbon-free insulating layer on combustion and provided with a layer of elastomer based insulating compound over said inorganic material layer, a bare earth wire, and a sheath consisting of a laminate of a thermoplastic polymeric composition/metal foil and an extruded sheathing of a polymeric composition around the laminate, the sheath enclosing the insulated conductors and the earth wire with the metal layer of the laminate on the inside and in contact with the earth wire throughout the length of the cable. The metal foil may comprise aluminium, copper, steel or other suitable metal.The extruded sheathing of polymeric composition will generally be fire retardant, but this may not always be necessary, particularly when the foil metal is steel.
The layer of organic material forming a carbon-free insulating layer on combustion preferably comprises tapes of a sheet material consisting of mica paper supported on an open weave glass fabric, which tapes are wound spirally around each conductor with a suitable overlap, or longitudinally formed around the conductor. The elastomer based insulating compound layer preferably comprises an extruded layer of ethylene-propylene based rubber insulation. Other materials such as cross-linked polyethylene, butyl rubber or thermoplastic rubber may be used provided that the layer has the required electrical properties, moisture resistance necessary to protect the mica paper from a deterioration of its own electrical resistance, and mechanical properties to cushion the mica-paper tapes. Mica paper supported on open weave glass fabric is available commercially.
When exposed to fire, the ethylene propylene rubber is destroyed but the mica paper remains intact and maintains adequate electrical resistance between adjacent conductors.
1. A multi-core electric cable, which comprises two or more electric conductors, each provided with a layer of an inorganic material which forms a carbon-free insulating layer on combustion and provided with a layer of elastomer-based insulating compound over said inorganic material layer, a bare earth wire, and a sheath comprising a laminate of a thermoplastic polymeric composition/metal foil and an extruded sheathing of a polymeric composition around the laminate, the sheath enclosing the insulated conductors and the earth wire with the metal layer of the laminate on the inside and in contact with the earth wire throughout the length of the cable.
2. A cable as claimed in claim 1, in which the extruded sheathing of polymeric composition is fire retardant.
3. A cable as claimed in claim 1 or 2, in which the layer of an inorganic material on each conductor comprises tapes of a sheet material comprising mica paper supported on an open weave glass fabric.
4. A cable as claimed in any preceding claim, in which the elastomer-based insulating compound layer on each conductor comprises an extruded layer of ethylene-propylene based rubber insulation.
5. A cable as claimed in any one of claims 1 to 3, in which the elastomer-based insulating compound layer on each conductor comprises cross-linked polyethylene, butyl rubber or thermoplastic rubber.
6. A multi-core electric cable as claimed in claim 1 and substantially as herein described.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A multi-core electric cable, which comprises two or more electric conductors, each provided with a layer of an inorganic material which forms a carbon-free insulating layer on combustion and provided with a layer of elastomer-based insulating compound over said inorganic material layer, a bare earth wire, and a sheath comprising a laminate of a thermoplastic polymeric composition/metal foil and an extruded sheathing of a polymeric composition around the laminate, the sheath enclosing the insulated conductors and the earth wire with the metal layer of the laminate on the inside and in contact with the earth wire throughout the length of the cable.
2. A cable as claimed in claim 1, in which the extruded sheathing of polymeric composition is fire retardant.
3. A cable as claimed in claim 1 or 2, in which the layer of an inorganic material on each conductor comprises tapes of a sheet material comprising mica paper supported on an open weave glass fabric.
4. A cable as claimed in any preceding claim, in which the elastomer-based insulating compound layer on each conductor comprises an extruded layer of ethylene-propylene based rubber insulation.
5. A cable as claimed in any one of claims 1 to 3, in which the elastomer-based insulating compound layer on each conductor comprises cross-linked polyethylene, butyl rubber or thermoplastic rubber.
6. A multi-core electric cable as claimed in claim 1 and substantially as herein described.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7918768A GB2050041B (en) | 1979-05-30 | 1979-05-30 | Fire resistant cable |
| BR8003364A BR8003364A (en) | 1979-05-30 | 1980-05-29 | FIRE PROOF CABLE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7918768A GB2050041B (en) | 1979-05-30 | 1979-05-30 | Fire resistant cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2050041A true GB2050041A (en) | 1980-12-31 |
| GB2050041B GB2050041B (en) | 1983-02-02 |
Family
ID=10505526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7918768A Expired GB2050041B (en) | 1979-05-30 | 1979-05-30 | Fire resistant cable |
Country Status (2)
| Country | Link |
|---|---|
| BR (1) | BR8003364A (en) |
| GB (1) | GB2050041B (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0100829A3 (en) * | 1982-08-06 | 1984-04-18 | Aeg - Telefunken Kabelwerke Ag, Rheydt | Halogen-free, fire-resisting cable continuing to function for a certain period in case of fire |
| US4500748A (en) * | 1982-05-24 | 1985-02-19 | Eaton Corporation | Flame retardent electrical cable |
| US4547626A (en) * | 1983-08-25 | 1985-10-15 | International Standard Electric Corporation | Fire and oil resistant cable |
| US4605818A (en) * | 1984-06-29 | 1986-08-12 | At&T Technologies, Inc. | Flame-resistant plenum cable and methods of making |
| US4659871A (en) * | 1982-10-01 | 1987-04-21 | Raychem Limited | Cable with flame retarded cladding |
| WO1992019903A1 (en) * | 1991-05-06 | 1992-11-12 | Viking Mjøndalen A.S | Multilayer fire protective coating |
| EP0628972A3 (en) * | 1993-06-11 | 1995-02-22 | Bicc Plc | Electric cables. |
| WO1995020227A1 (en) * | 1994-01-19 | 1995-07-27 | Huber & Suhner Ag Kabel-, Kautschuk-, Kunststoff-Werke | Fire-proof cable |
| GB2327529A (en) * | 1997-07-08 | 1999-01-27 | City Electrical Factors Ltd | Fire-resistant electric cable |
| DE10051962A1 (en) * | 2000-10-20 | 2002-05-02 | Alcatel Sa | Insulated electrical conductor with functional integrity in the event of a fire |
| DE10203900A1 (en) * | 2002-01-31 | 2003-08-14 | Nexans | Electrical line |
| US6787694B1 (en) | 2000-06-01 | 2004-09-07 | Cable Design Technologies, Inc. | Twisted pair cable with dual layer insulation having improved transmission characteristics |
| CN103785333A (en) * | 2014-02-20 | 2014-05-14 | 刘建国 | Energy-saving steam-reforming furnace pipe |
| CN109637731A (en) * | 2018-12-25 | 2019-04-16 | 新沂博瑞工业设计有限公司 | A kind of flame retardant cable |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6441308B1 (en) | 1996-06-07 | 2002-08-27 | Cable Design Technologies, Inc. | Cable with dual layer jacket |
-
1979
- 1979-05-30 GB GB7918768A patent/GB2050041B/en not_active Expired
-
1980
- 1980-05-29 BR BR8003364A patent/BR8003364A/en not_active IP Right Cessation
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4500748A (en) * | 1982-05-24 | 1985-02-19 | Eaton Corporation | Flame retardent electrical cable |
| EP0100829A3 (en) * | 1982-08-06 | 1984-04-18 | Aeg - Telefunken Kabelwerke Ag, Rheydt | Halogen-free, fire-resisting cable continuing to function for a certain period in case of fire |
| US4659871A (en) * | 1982-10-01 | 1987-04-21 | Raychem Limited | Cable with flame retarded cladding |
| US4547626A (en) * | 1983-08-25 | 1985-10-15 | International Standard Electric Corporation | Fire and oil resistant cable |
| US4605818A (en) * | 1984-06-29 | 1986-08-12 | At&T Technologies, Inc. | Flame-resistant plenum cable and methods of making |
| WO1992019903A1 (en) * | 1991-05-06 | 1992-11-12 | Viking Mjøndalen A.S | Multilayer fire protective coating |
| AU676036B2 (en) * | 1993-06-11 | 1997-02-27 | Bicc Public Limited Company | Electric cables |
| EP0628972A3 (en) * | 1993-06-11 | 1995-02-22 | Bicc Plc | Electric cables. |
| WO1995020227A1 (en) * | 1994-01-19 | 1995-07-27 | Huber & Suhner Ag Kabel-, Kautschuk-, Kunststoff-Werke | Fire-proof cable |
| GB2327529A (en) * | 1997-07-08 | 1999-01-27 | City Electrical Factors Ltd | Fire-resistant electric cable |
| GB2327529B (en) * | 1997-07-08 | 2001-07-04 | City Electrical Factors Ltd | Electrical cable |
| US6787694B1 (en) | 2000-06-01 | 2004-09-07 | Cable Design Technologies, Inc. | Twisted pair cable with dual layer insulation having improved transmission characteristics |
| DE10051962A1 (en) * | 2000-10-20 | 2002-05-02 | Alcatel Sa | Insulated electrical conductor with functional integrity in the event of a fire |
| DE10203900A1 (en) * | 2002-01-31 | 2003-08-14 | Nexans | Electrical line |
| US6720498B2 (en) | 2002-01-31 | 2004-04-13 | Nexans | Electrical line |
| CN103785333A (en) * | 2014-02-20 | 2014-05-14 | 刘建国 | Energy-saving steam-reforming furnace pipe |
| CN109637731A (en) * | 2018-12-25 | 2019-04-16 | 新沂博瑞工业设计有限公司 | A kind of flame retardant cable |
| CN109637731B (en) * | 2018-12-25 | 2020-08-11 | 哈尔滨交联电力电缆制造有限公司 | a flame retardant cable |
Also Published As
| Publication number | Publication date |
|---|---|
| BR8003364A (en) | 1980-12-30 |
| GB2050041B (en) | 1983-02-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960530 |