DISTRIBUTING BUS-BAR

Abstract: An electric power distributing bus-bar or cable comprising a carrying line (10) and electric conductor parts (11-15). The carrying line (10) and the conductor parts (11-15) are disposed in a common electrically insulated jacket (16) and the electric conduction capacity of the carrying line (10) is adapted to and preferably similar to that of each one of the conductor parts so that the carrying line (10) may be used as a complementary conductor.

Description: Distributing bus-bar. The present invention relates to a distributing bus-bar, particularly for electric power distribution, comprising a plurality of insulated electric conductors and a through-going carrying line. Already previously a hanging cable has been proposed for electric power distribution, communication, signalling or controlling, which comprises a carrying line and a jacket carried thereby. The jacket is tube shaped and houses electric conductors. The characterizing feature of this known hanging cable is that the electric conductors are movable with respect to each other and with respect to the jacket which permits the conductors to be axially moved with respect to the carrying line. The tube shaped jacket may be made from conducting material, such as metal, or from insulating material, e.g. a thermoplastic material such as nylon or the like. The carrying line is preferably embedded in the wall of the tube which may be thin-walled around the rest of its periphery. To meet the demands this hanging cable may be designed for 1-phase or 3-phase power distribution, or for communication, signalling or control over the desired number of conductors. If not only the insulated electric conductors are introduced into the tube during the manu- facture but also one or more pulling wires the advantage is achieved that an already finished installation may be completed by one or more conductor parts. If desired it is also possible to replace electric conductors by others in an already finished installation. Further, the follow- ing advantages are gained: It is very easy to control the tension of the carrying line and to completely avoid that the electric conductors take up tensile loads. Both the carrying line and the electric conductors can, by taking up openings in the tube shaped jacket, easily be made accessible for attachement to poles and for connection to service lines or branch lines. If the electric conductors of e.g. power distri¬ bution lines are parallel disposed individually insulated conductors, i.e. without a uniting winding, stranding the like, the conductors may very easily be separated to permit mounting of connecting clamps. If the tube is made from insulating material it affords a protection against disturbances if cables for different purposes come into contact with each other. A hanging cable of standard dimensions may be used for varying numbers of electric conductors and also for several conductor dimensions which facilitates the store holding. Thus, hanging cables of the above described type have a plurality of advantageous properties and accordingly they have come to a widespread use. The present invention has aimed at providing a distri¬ buting bus-bar which has at least some of the advantageous properties that are inherent with the just described hanging cable and which beyond those has some installation technical and economical advantages. To the just mentioned end there is provided according to the present invention a distributing bus-bar comprising a carrying line and electric conductor parts which distri- buting bus-bar is characterized in that the carrying line and the conductor parts are disposed in a common electric¬ ally insulated jacket and that the conduction capacity of the carrying line is adapted to and is preferably the same as the conduction capacity of each one of the conductor parts so that the carrying line may be used as a comple¬ mentary conductor part. Preferably both the electric conductor parts and the complementary conductor part consist of few-threaded aluminum conductors, e.g. of the kind which is commers- ially available under the Trade Mark "Ductalex", but also solid • conductors may be used. The invention will be disclosed in more details below with reference had to the accompanying drawing. FIG. 1 is a perspective view of a portion of a distri- buting bux-bar according to the invention, FIG. 2 shows a cross-section of the distributing bus-bar. The embodiment of the hanging cable shown as an example in the drawing comprises a carrying line 10 and a plurality of electric conductor parts 11,12,13,14 and 15, which are disposed in a common electrically insulating jacket 16. The jacket portion 16A which surrounds the carrying line 10 and the jacket portion 16B which sur- 5 rounds the electrical conductor parts 11-15 are separated from each other by means of a web 16C so that there is a good possibility to affix the distributing bus-bar in case this is to be used e.g. as a hanging cable. In the example shown the carrying line 10 and each one of the 10 conductor parts 11-15 has its own insulation, so as ■ is indicated e.g. by the insulation 10A, 13A and 15A. Each one of the conductor parts may have a conductor area of e.g. 25 mm 2 and may consist of a 7-threaded aluminum alloy, e.g. of the kind which is sold under the 15 Trade Mark "Ductalex". The conductor part insulation 13A, 15A may consist of PVC and have a thickness of 1,3 mm. The carrying line may similarly consist of a 7-threaded 2 aluminum conductor with a conductor area of e.g. 25 mm and the conductor insulation consists similarly of PVC of 20 a thickness of 1,3 mm. The jacket 16 consists of PVC and has a thickness of 1,2 mm. The conductor parts are preferably* color marked so they are easy to identify, e.g. one part green/yellow, one part blue, one part brown and remaining parts black with 25 one of the black parts also marked with the figure 1. The carrying line 10, which is useful as a complementary conductor, is preferably marked green/yellow. The distributing bus-bar according to the invention is with special advantages for illuminating systems within 30 industries, department stores, athletic halls, excersise tracks and underground rooms. It is also very useful in the power distribution technique, e.g. within small factories, farm service houses, work shop hotels and -*% various kinds of service operations. At building, sites 35 the distributing bus-bar according to the invention is particularly useful in temporary electric systems, par¬ ticularly at elongated building sites, such as bridge buildings, culvert buildings and in staircases for elect¬ ric power distribution between different planes. ^-^βURE • - OMPI " It should be mentioned that the increasing use of electric discharge lamps motivates an increased attention to the losses which occur due to the overtunes in the power net which are inherent with such light sources. Also other cases which cause overtunes in the power net require due attention. The dimensioning of the zero- conductor is of importance for a low power consumption. The invention permits a considerable increase of the conduction capacity of the zero-function as compared to that of the other phase conductors by parallel coupling of the zero conductor and the carrying * conductor 10.- Elongated systems are limited by the fact that the so called tripping condition must be met. By parallel coupling of the protective conductor and the carrying conductor 10 the system may be given properties which permit very elongated installations. Depending on the organisation of the power distri¬ bution net and other local conditions sometimes a so called potential equalisation may be required. To that end it sometimes happens that a separate conductor is installed which may be difficult to identify within a system. For the same purpose it is instead possible according to the invention to use the carrying line 10. Due to its mechanical binding to the distributing bus-bar or cable this conductor is always easy to identify. It should be mentioned that the individual parts of the distributing bus-bar according to the invention must not necessarily be continuously cabled around each other. Instead they may be cabled back and forth (SZ-cabling) and of course it would also be possible to permit one of the parts or several of them to run purely parallel to the other, cabled parts. A plurality of modifications and alterations as to details may be carried out within the scope of protection.

Claims: Claim. A distributing bus-bar or cable comprising a carrying line (10) and electric conductor parts (11-15) , character- 5 ized in that the carrying line (10) and the conductor parts (11-15) are disposed in a common electrically insulated jacket (16) and in that the electric conduction capacity of the carrying (10) line is adapted to and is preferably similar to that of each one of the conductor 10 parts so that the carrying line (10) may be used as a complementary conductor. £ "BU EA OMPI

Inventors: CEDERSTROEM ROLF, CEDERSTROEM, ROLF
Applicants: CEDERSTROM ROLF, CEDERSTROEM, ROLF
Application year: 1983
Main classification: H01B7
IPC codes: H01B7, H01B9