GB2262835A - Multi-core electric power cables - Google Patents
Multi-core electric power cables Download PDFInfo
- Publication number
- GB2262835A GB2262835A GB9127165A GB9127165A GB2262835A GB 2262835 A GB2262835 A GB 2262835A GB 9127165 A GB9127165 A GB 9127165A GB 9127165 A GB9127165 A GB 9127165A GB 2262835 A GB2262835 A GB 2262835A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electric power
- conductors
- sheath
- ground
- core electric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/028—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients with screen grounding means, e.g. drain wires
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/38—Insulated conductors or cables characterised by their form with arrangements for facilitating removal of insulation
Landscapes
- Insulated Conductors (AREA)
Abstract
A multi-core electric power cable comprises a plurality of electrically insulated phase conductors 1 and bare ground conductors 3, each comprising a plurality of wires assembled together, helically laid up together and surrounded by an overall extruded plastics sheath 5. A plurality of tapes 4 e.g. of polyester, overlies the radially outer part of one of the ground conductors 3 throughout the length of the cable to prevent direct contact between the ground conductor and plastics material of the sheath 5 and each tape is made of a material which does not soften or bond to wires of the ground conductor during extrusion of the sheath. In consequence the sheath may be removed easily prior to stripping back the phase conductor for termination. <IMAGE>
Description
MULTI-CORE ELECTRIC POWER CABLES
This invention relates to multi-core electric power cables of the kind comprising a plurality of electrically insulated conductors, generally one for each phase, and a like plurality of bare ground or earth conductors each comprising a plurality of wires stranded or otherwise assembled together, helically laid up together and surrounded by an overall extruded sheath of rubber or plastics material. The invention is especially, but not exclusively, concerned with a multicore electric power cable of this kind in which each electrically insulated phase conductor is surrounded by an electrically conductive shield or screen and in which each ground conductor is disposed in the outer interstice between, and is in electrical contact with the electrically conductive shields surrounding, adjacent electrically insulated phase conductors.
When terminating a multi-core electric power cable of the aforesaid kind, removal of the overall sheath of an end part of the cable to expose a length of each electrically insulated phase conductor is frequently rendered difficult by rubber or plastics material of the extruded overall sheath which has flowed into interstices between and/or has bonded to wires of one or more than one of the ground conductors. As a consequence, removal of the sheath at this end part of the cable is often a tedious and time consuming operation.
It is an object of the present invention to provide an improved multi-core electric power cable of the aforesaid kind which is of such a construction that flow of rubber or plastics material of the overall sheath during extrusion of the sheath into interstices between wires of the ground conductors is prevented and that removal of the overall sheath from an end part of the cable during termination thereof can be readily effected.
In the improved multi-core electric power cable according to the invention, a plurality of tapes underlying the overall sheath and circumferentially spaced around and extending lengthwise of the cable each overlie the radially outer part of one of the ground conductors throughout the length of the cable to prevent direct contact between the ground conductor and rubber or plastics material of the overall sheath and are each of a material which will not soften or bond to wires of the ground conductor underlying the tape during extrusion of the overall sheath.
By virtue of the fact that the tape overlying each ground conductor prevents rubber of plastics material of the overall sheath from entering into interstices between and/or bonding to wires of the ground conductor, the overall sheath can be readily removed from an end part of the improved cable to expose lengths of the electrically insulated phase conductors during a terminating operation.
Where each electrically insulated phase conductor is surrounded by an electrically conductive shield and each ground conductor is disposed in the outer interstices between, and is an electrical contact with the electrically conductive shield surrounding, adjacent electrically insulated phase conductors, the improved multi-core electric power cable has the further important advantage that flow of rubber or plastics material into interstices between wires of the ground conductors is prevented without inhibiting electrical contact between each ground conductor and the electrical conductive shields of the electrically insulated phase conductors between which the ground conductor is disposed.
The or each tape may be of any non-metallic material that will not soften or bond to wires of a ground conductor during extrusion of the overall sheath, a tape of a polyester being preferred. In some circumstances, the or each tape may be of metallic foil.
The invention is further illustrated, by way of example, by the accompanying informal drawing which shows a transverse cross-sectional view of a preferred multi-core electric power cable, drawn on a reduced scale.
Claims (5)
1. A multi-core electric power cable comprising a plurality of electrically insulated conductors, one for each phase, and a like plurality of bare ground or earth conductors each comprising a plurality of wires stranded or otherwise assembled together, helically laid up together and surrounded by an overall extruded sheath of rubber or plastics material, wherein a plurality of tapes underlying the overall sheath and circumferentially spaced around and extending lengthwise of the cable each overlie the radially outer part of one of the ground conductors throughout the length of the cable to prevent direct contact between the'ground conductor and rubber or plastics material of the overall sheath and are each of a material which will not have softened or bonded to wires of the ground conductor underlying the tape during extrusion of the overall sheath.
2. A multi-core electric power cable as claimed in
Claim 1, wherein each electrically insulated phase conductor is surrounded by an electrically conductive shield and each ground conductor is disposed in the outer interstice between, and is in electrical contact with the electrically conductive shields surrounding, adjacent electrically insulated phase conductors.
3. A multi-core electric power cable as claimed in
Claim 1 or 2, wherein each of the tapes overlying the radially outer parts of the ground conductors is made of a polyester.
4. A multi-core electric power cable as claimed in
Claim 1 or 2, wherein each of the tapes overlying the radially outer parts of the ground conductors is made of metallic foil.
5. A multi-core electric power cable substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9127165A GB2262835A (en) | 1991-12-20 | 1991-12-20 | Multi-core electric power cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9127165A GB2262835A (en) | 1991-12-20 | 1991-12-20 | Multi-core electric power cables |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9127165D0 GB9127165D0 (en) | 1992-02-19 |
| GB2262835A true GB2262835A (en) | 1993-06-30 |
Family
ID=10706659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9127165A Withdrawn GB2262835A (en) | 1991-12-20 | 1991-12-20 | Multi-core electric power cables |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2262835A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100163274A1 (en) * | 2007-02-23 | 2010-07-01 | Josep Maria Batlle | Power cable with high torsional resistance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1350605A (en) * | 1971-07-27 | 1974-04-18 | Pirelli General Cable Works | Electricity distribution cable |
| US5107076A (en) * | 1991-01-08 | 1992-04-21 | W. L. Gore & Associates, Inc. | Easy strip composite dielectric coaxial signal cable |
-
1991
- 1991-12-20 GB GB9127165A patent/GB2262835A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1350605A (en) * | 1971-07-27 | 1974-04-18 | Pirelli General Cable Works | Electricity distribution cable |
| US5107076A (en) * | 1991-01-08 | 1992-04-21 | W. L. Gore & Associates, Inc. | Easy strip composite dielectric coaxial signal cable |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100163274A1 (en) * | 2007-02-23 | 2010-07-01 | Josep Maria Batlle | Power cable with high torsional resistance |
| US8669474B2 (en) * | 2007-02-23 | 2014-03-11 | Prysmian Cables Y Sistemas S.L. | Power cable with high torsional resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9127165D0 (en) | 1992-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5057646A (en) | Folded ribbon cable assembly having integral shielding | |
| US5162611A (en) | Folded ribbon cable assembly having integral shielding | |
| US6566605B1 (en) | Multiple pair cable with individually shielded pairs that is easy to connect | |
| US4842553A (en) | Method and assembly for terminating a conductive polymer-shielded coaxial electrical cable | |
| US6046408A (en) | Neutral conductor grounding system | |
| EP0558463B1 (en) | An electric cable | |
| US4081602A (en) | Self-supporting cable | |
| US3474189A (en) | Electric power cable | |
| US11777297B2 (en) | Cord reel including a polymeric sheath with a conductive EMI drain | |
| US4727222A (en) | Flexible shielded coaxial cable | |
| US8536450B2 (en) | Sheath providing protection against radiation, in particular from the electric field generated by electric cables | |
| US2876274A (en) | Shielded electric connector | |
| US4518819A (en) | Clamp assembly for power cables | |
| US7700873B2 (en) | Protective sheath against radiation, in particular derived from electric field generated by electric cables | |
| US5021007A (en) | Screened flat electric cable having a plurality of parallel conductors | |
| CN1077719C (en) | Ribbon cable with terminal edge reinforcement | |
| GB2262835A (en) | Multi-core electric power cables | |
| GB1592625A (en) | Screen-protected and plastics-insulated power cable | |
| US2857453A (en) | Shielding tape for electric power cables | |
| EP0071482A1 (en) | Connection assembly and method for power cables | |
| GB2165690A (en) | Electrical cables | |
| GB2252866A (en) | Flexible electrically insulated electric conductor | |
| KR200177486Y1 (en) | Insulated cable | |
| GB2189949A (en) | Insulation for terminating screened power cable | |
| JP2000323201A (en) | Waterproofing structure of shield wire end portion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |