CA2058696A1 - Flexible electrically insulated electric conductor - Google Patents
Flexible electrically insulated electric conductorInfo
- Publication number
- CA2058696A1 CA2058696A1 CA 2058696 CA2058696A CA2058696A1 CA 2058696 A1 CA2058696 A1 CA 2058696A1 CA 2058696 CA2058696 CA 2058696 CA 2058696 A CA2058696 A CA 2058696A CA 2058696 A1 CA2058696 A1 CA 2058696A1
- Authority
- CA
- Canada
- Prior art keywords
- flexible
- plastics material
- electrically insulated
- insulated electric
- flexible barrier
- 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.)
- Abandoned
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
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
-
- 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
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
- H01B7/041—Flexible cables, conductors, or cords, e.g. trailing cables attached to mobile objects, e.g. portable tools, elevators, mining equipment, hoisting cables
Abstract
ABSTRACT
A flexible electrically insulated electric conductor comprises a plurality of wires assembled together, a flexible barrier of plastics material surrounding and immediately adjacent the conductor throughout its length and, overlying the flexible barrier, at least one layer of electrically insulating material.
The plastics material of the flexible barrier is substantially tougher than the material or materials of the overlying layer or layers and is of such radial thickness as to inhibit penetration by a broken wire of the conductor. The flexible conductor may be a flexible electrically insulated cord for connection to domestic electrical appliances and electrically operated tools and equipment or it may be a core of a flexible multi-core power cable. In the latter case, the plastics material of the flexible barrier will incorporate a filler rendering it semi-conductive.
A flexible electrically insulated electric conductor comprises a plurality of wires assembled together, a flexible barrier of plastics material surrounding and immediately adjacent the conductor throughout its length and, overlying the flexible barrier, at least one layer of electrically insulating material.
The plastics material of the flexible barrier is substantially tougher than the material or materials of the overlying layer or layers and is of such radial thickness as to inhibit penetration by a broken wire of the conductor. The flexible conductor may be a flexible electrically insulated cord for connection to domestic electrical appliances and electrically operated tools and equipment or it may be a core of a flexible multi-core power cable. In the latter case, the plastics material of the flexible barrier will incorporate a filler rendering it semi-conductive.
Description
~ !33 ~
. .
A~ IMPROVED FLEXIBLE EL~iCTRICALLY INSULATED
ELECTRIC CONDU~.TOR
This invention relates to flexible electrically insulated electric conductors o~ the kind compri~ing a plurality of wire stranded, bunched or otherwise assembled together and surrounded by at least one layer of electrically insulating material. Flexible electrically insulated electric conductors of this kind include flexible electrically insulated cords for connection to domestic electrical appliances such as, for example, electric irons, lamps and electrically operated devices used in a kitchen, and flexible single core and multi-core power cables incorporating one or more than one flexible electrically insulated electric conductor for connection to electrically operated tools and equipment used in industry, e.g. equipment incorporating a reeling and de-reeling facility, and by a handyman.
We have found that, over a period of time, freguent flexing of a flexible electrically insulated electric conductor can cause a wire of the conductor to .:
break and an end part of such a broken wire sometimes penetrates outwardly into and through the overlying -layers or layers of electrically insulatlng material. A
flexible electrically insulated electric conductor which is connected to an electrical appliance and which has a ;~
live wire or live wires protruding through its -`~
electrically insulating layer or layers is extremely .: - ,.:: ~
dangerous, especially if handled with damp hands - as ,.,", ," ~ .
~ . .
~3 2.
may be the case where the el~ctrical appliance to which the flexible electrically insulated electric conductor is connected is in a kitchen.
It is an object of the present invention to provide an improved flexible electrically insulated electric conductor of the kind described in which the aforesaid risk is eliminated or at leas* substantially reduced.
According to the invention, the improved flexible electrically insulated electric conductor comprises a plurality of wires stranded, bunched or otherwise assembled together, a flexible barrier of plastics material surrounding and immediately adjacent the conductor throughout its length and, overlying the flexible barrier, at least one layer of electrically insulating material, the plastics material of the flexible barrier being substantially tougher than the material or materials of the overlying layer or layers and being of such radial thickness as to inhibit penetration by a broken wire of the conductor.
` ` The flexible barrier may be in the form of an extruded layer of said plastics material or it may be in the form of one or more than one layer of helically applied tape of said plastics material. In the latter case, where~the flexible barrier comprises two or more layers of helically applied tape of said pla~tics material, preferably adjacent layers of helically applied tape!s will be of opposite hand to one another.
~ . . , , . -3.
Preferably, the flexible barriex has a radial thickness lying in the range 0.0ld to 0.10d, where d is the overall diameter of the bare conductor.
The plastics material of the flexible barrier preferably is a relatively tough polymeric material;
suitable relatively tough polymeric materials include urethanes, polyurethanes, thermoplastic polyurethane elastomers, polyesters and polyamides.
; Where the layer immediately overlying the flexible ~: ~ 10 barrier is of electrically insulating plastics material, ~: the plastics material of the flexible barrier may itself have electrically insulating properties or it may be rendered semi-conductive by the incorporation of carbon black or other electrically conductive filler so that the flexible barrier also constitutes a semi-conductive ~; conductor screen or shieldO ::~
Where the layer immediately overlying the flexible ~-barrier is of a semi-conductive plastics material and ; ~ ; constitutes a conductor screen or shield, the plastics 20 ~ material of the flexible barrier will incorporate carbon ; black or other electrically conductive filler rendering the plastics material of the flexible barrier semi- -`.~
conductive. ..
Since the plastics material of the flexible karrier may constitute a part of the electrical insulation of the conductor or a part of the semi~
conductive conductor screen or shield, the overall :~
diameter of the improved flexible electrically insulated ;;~ ;
': .~ : . . .~ . .
',"',~
',': '~
~. ::::
. .
A~ IMPROVED FLEXIBLE EL~iCTRICALLY INSULATED
ELECTRIC CONDU~.TOR
This invention relates to flexible electrically insulated electric conductors o~ the kind compri~ing a plurality of wire stranded, bunched or otherwise assembled together and surrounded by at least one layer of electrically insulating material. Flexible electrically insulated electric conductors of this kind include flexible electrically insulated cords for connection to domestic electrical appliances such as, for example, electric irons, lamps and electrically operated devices used in a kitchen, and flexible single core and multi-core power cables incorporating one or more than one flexible electrically insulated electric conductor for connection to electrically operated tools and equipment used in industry, e.g. equipment incorporating a reeling and de-reeling facility, and by a handyman.
We have found that, over a period of time, freguent flexing of a flexible electrically insulated electric conductor can cause a wire of the conductor to .:
break and an end part of such a broken wire sometimes penetrates outwardly into and through the overlying -layers or layers of electrically insulatlng material. A
flexible electrically insulated electric conductor which is connected to an electrical appliance and which has a ;~
live wire or live wires protruding through its -`~
electrically insulating layer or layers is extremely .: - ,.:: ~
dangerous, especially if handled with damp hands - as ,.,", ," ~ .
~ . .
~3 2.
may be the case where the el~ctrical appliance to which the flexible electrically insulated electric conductor is connected is in a kitchen.
It is an object of the present invention to provide an improved flexible electrically insulated electric conductor of the kind described in which the aforesaid risk is eliminated or at leas* substantially reduced.
According to the invention, the improved flexible electrically insulated electric conductor comprises a plurality of wires stranded, bunched or otherwise assembled together, a flexible barrier of plastics material surrounding and immediately adjacent the conductor throughout its length and, overlying the flexible barrier, at least one layer of electrically insulating material, the plastics material of the flexible barrier being substantially tougher than the material or materials of the overlying layer or layers and being of such radial thickness as to inhibit penetration by a broken wire of the conductor.
` ` The flexible barrier may be in the form of an extruded layer of said plastics material or it may be in the form of one or more than one layer of helically applied tape of said plastics material. In the latter case, where~the flexible barrier comprises two or more layers of helically applied tape of said pla~tics material, preferably adjacent layers of helically applied tape!s will be of opposite hand to one another.
~ . . , , . -3.
Preferably, the flexible barriex has a radial thickness lying in the range 0.0ld to 0.10d, where d is the overall diameter of the bare conductor.
The plastics material of the flexible barrier preferably is a relatively tough polymeric material;
suitable relatively tough polymeric materials include urethanes, polyurethanes, thermoplastic polyurethane elastomers, polyesters and polyamides.
; Where the layer immediately overlying the flexible ~: ~ 10 barrier is of electrically insulating plastics material, ~: the plastics material of the flexible barrier may itself have electrically insulating properties or it may be rendered semi-conductive by the incorporation of carbon black or other electrically conductive filler so that the flexible barrier also constitutes a semi-conductive ~; conductor screen or shieldO ::~
Where the layer immediately overlying the flexible ~-barrier is of a semi-conductive plastics material and ; ~ ; constitutes a conductor screen or shield, the plastics 20 ~ material of the flexible barrier will incorporate carbon ; black or other electrically conductive filler rendering the plastics material of the flexible barrier semi- -`.~
conductive. ..
Since the plastics material of the flexible karrier may constitute a part of the electrical insulation of the conductor or a part of the semi~
conductive conductor screen or shield, the overall :~
diameter of the improved flexible electrically insulated ;;~ ;
': .~ : . . .~ . .
',"',~
',': '~
~. ::::
4.
electric conductor need be no greater than that of a comparable flexible electrically insulated electric conductor in which no flexible barrier i~ incorporated.
The invention also includes a multi-core flexible power cable in which at least one of the cores is an improved flexible electrically insulated electric conductor a~ hereinbefore described.
The invention is further illustrated by a description, by way of example, of two preferred flexible electrically insulated electric conductors with reference to the accompanying drawing, in which:-Figure 1 is a transverse cross-sectional view, drawn on an enlarged scale, of a preferred flexible electrically insulated cord for connection to a domestic ~ eLectrical appliance, and Figure 2 is a transverse cross-sectional view, drawn on an enlarged scale, of a core of a preferred f1exible multi-core power cable for connection to industrial equipment incorporating a reeling and de-reeling facility for the cable.
Referring to Figure l, the preferred flexible electrically insulated cord comprises a conductor 1 ; consisting of a multiplicity of wires bunched together, a flexible barrier 2 of extruded electrically insulating poLyurethane surrounding and immediately adjacent the conductor throughout its length and, overlying the flexible barrier, a layer 3 of extruded electrically insulating ethylene propylene diene rubber (EPDM). The ~ ~3'~
electric conductor need be no greater than that of a comparable flexible electrically insulated electric conductor in which no flexible barrier i~ incorporated.
The invention also includes a multi-core flexible power cable in which at least one of the cores is an improved flexible electrically insulated electric conductor a~ hereinbefore described.
The invention is further illustrated by a description, by way of example, of two preferred flexible electrically insulated electric conductors with reference to the accompanying drawing, in which:-Figure 1 is a transverse cross-sectional view, drawn on an enlarged scale, of a preferred flexible electrically insulated cord for connection to a domestic ~ eLectrical appliance, and Figure 2 is a transverse cross-sectional view, drawn on an enlarged scale, of a core of a preferred f1exible multi-core power cable for connection to industrial equipment incorporating a reeling and de-reeling facility for the cable.
Referring to Figure l, the preferred flexible electrically insulated cord comprises a conductor 1 ; consisting of a multiplicity of wires bunched together, a flexible barrier 2 of extruded electrically insulating poLyurethane surrounding and immediately adjacent the conductor throughout its length and, overlying the flexible barrier, a layer 3 of extruded electrically insulating ethylene propylene diene rubber (EPDM). The ~ ~3'~
5.
bare conductor 1 has an overall diameter of 10.5 mm and the flexible barrier 2 has a radial thickness of approximately 0.3 mm and is su~Eficiently tough to inhibit penetration of the flexible barrier by a broken wire of the conductor. The ~lexible electrically insulated cord has an overall diameter of 14.8 mm.
Referring to Figure 2, the preferred flexible multi-core power cable comprises three sllbstantially identical flexible cores laid up together and surrounded by an overall cable sheath, one of which cores is illustrated in the Figure. The core comprises a conductor 11 consisting of a plurality of wires stranded together, a flexible barrier 12 of extruded semi-conductive polyurethane surrounding and immediately adjacent the conductor throughout its length, a layer 13 of extruded semi-conductive polyolefin overlying the flexible barrier which, in combination with the layer ;~
13, constitutes a conductor screen or shield, a layer 14 of extruded electrically insulating ethylene propylene diene rubber (EPDM) overlying the layer 13 and a layer 15 of extruded semi-conductive polyolefin overlying the ~-layer 14 and constituting a dielectric screen or shield.
The bare conductor 11 has a diameter of 10.5 mm and the flexible barrier 12 has a thickness of 0.3 mm and is sufficiently tough to inhibit penetration of the flexible barrier by a broken wire of the conductor. The core ha~ an overall di~meter of ls . a r~. ~
. . ~ .
bare conductor 1 has an overall diameter of 10.5 mm and the flexible barrier 2 has a radial thickness of approximately 0.3 mm and is su~Eficiently tough to inhibit penetration of the flexible barrier by a broken wire of the conductor. The ~lexible electrically insulated cord has an overall diameter of 14.8 mm.
Referring to Figure 2, the preferred flexible multi-core power cable comprises three sllbstantially identical flexible cores laid up together and surrounded by an overall cable sheath, one of which cores is illustrated in the Figure. The core comprises a conductor 11 consisting of a plurality of wires stranded together, a flexible barrier 12 of extruded semi-conductive polyurethane surrounding and immediately adjacent the conductor throughout its length, a layer 13 of extruded semi-conductive polyolefin overlying the flexible barrier which, in combination with the layer ;~
13, constitutes a conductor screen or shield, a layer 14 of extruded electrically insulating ethylene propylene diene rubber (EPDM) overlying the layer 13 and a layer 15 of extruded semi-conductive polyolefin overlying the ~-layer 14 and constituting a dielectric screen or shield.
The bare conductor 11 has a diameter of 10.5 mm and the flexible barrier 12 has a thickness of 0.3 mm and is sufficiently tough to inhibit penetration of the flexible barrier by a broken wire of the conductor. The core ha~ an overall di~meter of ls . a r~. ~
. . ~ .
6.
As has been previously indicated, since the electrically insulating flexible barrier 2 of the preferred flexible electrically insulated cord constitutes a part of the electrical insulation of the conductor 1 of the preferred flexible electrically insulated cord and the semi-corlductive flexible barrier 12 constitutes a part of the conductor screen or shield of the conductor 11 of the core of the preferred flexible multi-core power cable, the overall diameters ~ 10 of the preferred flexible electrically insulated cord ::~ ; and of the preferred flexible multi-core power cable need be no greater than that of comparable cords and cables in which no flexible barrier is provided.
~ ~ , :
, ,
As has been previously indicated, since the electrically insulating flexible barrier 2 of the preferred flexible electrically insulated cord constitutes a part of the electrical insulation of the conductor 1 of the preferred flexible electrically insulated cord and the semi-corlductive flexible barrier 12 constitutes a part of the conductor screen or shield of the conductor 11 of the core of the preferred flexible multi-core power cable, the overall diameters ~ 10 of the preferred flexible electrically insulated cord ::~ ; and of the preferred flexible multi-core power cable need be no greater than that of comparable cords and cables in which no flexible barrier is provided.
~ ~ , :
, ,
Claims (11)
1. A flexible electrically insulated electric conductor comprising a plurality of wires assembled together, a flexible barrier of plastics material surrounding and immediately adjacent the conductor throughout its length and, overlying the flexible barrier, at least one layer of electrically insulating material, the plastics material of the flexible barrier being substantially tougher than the material of the overlying layer and being of such radial thickness as to inhibit penetration by a broken wire of the conductor.
2. A flexible electrically insulated electric conductor as claimed in Claim 1, wherein the flexible barrier is in the form of an extruded layer of said plastics material.
3. A flexible electrically insulated electric conductor as claimed in Claim 1, wherein the flexible barrier is in the form of at least one layer of helically applied tape of said plastics material.
4. A flexible electrically insulated electric conductor as claimed in Claim 3 in which the flexible barrier comprises two layers of helically applied tape of said plastics material, wherein adjacent layers of helically applied tapes are of opposite hand to one another.
5. A flexible electrically insulated electric conductor as claimed in Claim 1, 2, or 3, wherein the flexible barrier has 8.
a radial thickness lying in the range 0.01d to 0.10d, where d is the overall diameter of the bare conductor.
a radial thickness lying in the range 0.01d to 0.10d, where d is the overall diameter of the bare conductor.
6. A flexible electrically insulated electric conductor as claimed in Claim 1, 2 or 3, wherein the plastics material of the flexible barrier is a relatively tough polymeric material selected from the group of polymeric materials consisting of urethanes, polyurethanes, thermoplastic polyurethane elastomers, polyesters and polyamides.
7. A flexible electrically insulated electric conductor as claimed in Claim 1, 2 or 3 in which the layer immediately overlying the flexible barrier is of electrically insulating plastics material, wherein the plastics material of the flexible barrier has electrically insulating properties.
8. A flexible electrically insulated electric conductor as claimed in Claim 1 in which the layer immediately overlying the flexible barrier is of electrically insulating plastics material, wherein the plastics material of the flexible barrier is rendered semi-conductive by the incorporation of electrically conductive filler so that the flexible barrier also constitutes a semi-conductive conductor shield.
9. A flexible electrically insulated electric conductor as claimed in Claims 1 in which the layer immediately overlying the flexible barrier is of a semi-conductive plastics material and 9.
constitutes a conductor shield, wherein the plastics material of the flexible barrier incorporates electrically conductive filler rendering the plastics material of the flexible barrier semi-conductive.
constitutes a conductor shield, wherein the plastics material of the flexible barrier incorporates electrically conductive filler rendering the plastics material of the flexible barrier semi-conductive.
10. A multi-core flexible power cable in which at least one of the cores is a flexible electrically insulated electric conductor as claimed in Claim 8.
11. A multi-core flexible power cable in which at least one of the cores is a flexible electrically insulated electric conductor as claimed in Claim 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919100034A GB9100034D0 (en) | 1991-01-03 | 1991-01-03 | An improved flexible electrically insulated electric conductor |
| GB9100034.9 | 1991-01-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2058696A1 true CA2058696A1 (en) | 1992-07-04 |
Family
ID=10687887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2058696 Abandoned CA2058696A1 (en) | 1991-01-03 | 1992-01-02 | Flexible electrically insulated electric conductor |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU9011591A (en) |
| CA (1) | CA2058696A1 (en) |
| GB (2) | GB9100034D0 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2827999B1 (en) * | 2001-07-25 | 2003-10-17 | Nexans | SEMICONDUCTOR SCREEN FOR ENERGY CABLE |
| JP5664927B2 (en) * | 2011-11-21 | 2015-02-04 | アイシン・エィ・ダブリュ株式会社 | Conductor wire and rotating electrical machine |
| EP2725398B1 (en) * | 2012-10-23 | 2019-03-20 | Nexans | Electric cable for a motor vehicle |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3710009A (en) * | 1971-12-16 | 1973-01-09 | Borg Warner | Electrical cable |
| US4801501A (en) * | 1986-08-28 | 1989-01-31 | Carlisle Corporation | Insulated conductor with multi-layer, high temperature insulation |
-
1991
- 1991-01-03 GB GB919100034A patent/GB9100034D0/en active Pending
- 1991-12-23 GB GB9127199A patent/GB2252866A/en not_active Withdrawn
- 1991-12-31 AU AU90115/91A patent/AU9011591A/en not_active Abandoned
-
1992
- 1992-01-02 CA CA 2058696 patent/CA2058696A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB2252866A (en) | 1992-08-19 |
| AU9011591A (en) | 1992-07-09 |
| GB9100034D0 (en) | 1991-02-20 |
| GB9127199D0 (en) | 1992-02-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |