WO2021069363A1

WO2021069363A1 - Bus bar for lights or electrical units

Info

Publication number: WO2021069363A1
Application number: PCT/EP2020/077822
Authority: WO
Inventors: Andreas Machate
Original assignee: Zumtobel Lighting Gmbh
Priority date: 2019-10-08
Filing date: 2020-10-05
Publication date: 2021-04-15
Also published as: AT17789U1; DE102019126950A1

Abstract

The invention relates to a bus bar comprising multiple interconnectable bus bar sections (10, 20), each having at least one conductor, which runs in the longitudinal direction, for supplying current and/or for transmitting signals and which is provided in grooves (13, 23), open towards a contacting side, of a conductor receiving structure (12, 22) consisting of an insulating material. According to the invention, the connecting region between two successive bus bar sections (10, 20) is provided with electrical connectors (30), to which the respective end faces of two conductor sections (11, 21) to be interconnected are connected, the electrical connectors (30) connecting the conductor sections (11, 21) on a rear side lying opposite the contacting side.

Description

description

Conductor rail for lights or electrical units

The present invention relates to a power rail for lights or electrical units and a light strip system which has such a power rail.

Busbars are characterized in that the wires or lines used for power supply are accessible or contactable over an at least larger elongated section, which opens up the possibility of being able to position consumers to be connected more or less flexibly at least over this area. This means that the consumers - for example the lights of a trunking system - can not only be arranged at fixed, predetermined positions, but can also be positioned freely at the desired location.

A well-known trunking system in which such busbars are used is sold by the applicant under the name “TECTON”. A special feature of this trunking system is that the lines used for power supply provide a normal mains supply voltage of e.g. 250 volts and are still continuously accessible for contacting over the entire length of the trunking system. This is achieved, among other things, in that the lines are arranged in a line receiving structure made of an insulating material, which forms grooves that are open towards one contacting side. From this side, the lines can then be contacted by lights or other consumers connected to the trunking system, whereby the grooves and the individual components of the line receiving structure are designed in such a way that accidental contact with the current-carrying lines is prevented or the corresponding safety regulations are implemented which should be prevented from accidentally touching the cables.

In principle, the power rail used in the above-mentioned trunking system could be implemented in any length. For manufacturing reasons, however, the line receiving structure consisting of the insulating material or the support rail containing the line receiving structure, which is the load-bearing element of the trunking system, is only manufactured and transported up to a certain length. Correspondingly, in the system known from the prior art, corresponding mounting rails, which are equipped with sections of a busbar, are shown in FIG Standard lengths made available, in which case the support rails and the busbar sections must be connected to one another when installing the trunking system on site.

Another special feature of the “TECTON” trunking system mentioned is that it is also possible to position luminaires or other loads and make contact in the area where two consecutive trunking rails or power rail sections are connected. This is made possible by the use of special electrical connection contacts, as shown in FIG.

FIG. 15 shows a single electrical connection contact as it is currently used in the “TECTON” system and is known, for example, from EP 1 284 033 B1. This connecting contact 100 consists of an elongated contacting plate 101 which is bent on its long sides and whose function is to take over and forward the electrical current of the lines that are routed along the busbar. For this purpose, spring contacts 102 are arranged at the ends of the contacting plate 101, which enable the end regions of the wires of two current sections to be connected to be connected to one another in a clamping manner.

As FIG. 16 shows, connecting elements 106 are also provided in the transition area of two mounting rails 105 to be connected to one another (here the front end area of a mounting rail, which is to be connected to another structurally identical mounting rail) of the trunking system is provided, which serve to accommodate the electrical connection contacts 100. These connecting elements 106 have groove-like recesses 107 corresponding to the grooves of the line receiving structure, the electrical connecting contacts 100 being inserted into the connecting element 106 in such a way that the contacting plates 101 of the connecting contacts 100 are accessible via the groove-shaped recesses 107. The recesses 107 of the connecting element 106 thus continue the grooves of the line receiving structure and the contacting plate 101 bridges the lines of the busbar sections to be connected to one another. Ultimately, this leads to the fact that there is always a contact option for lights or consumers to be connected in the connection area, so that in the known light strip system there is actually the possibility of contacting uninterrupted over the entire length. As a result, compared to other known systems, an outstanding flexibility with regard to the Possibility of arranging lights or other electrical units achieved.

In addition to the connection elements described above, which are very advantageous with regard to the contacting options, other solutions are also known from the prior art for connecting busbar sections to one another. A widespread and simple solution here is that the interface between two busbar sections to be connected is bridged by a cable harness which has corresponding contacting elements at both ends that contact all the lines of the busbar and then via a single cable of the cable harness are interconnected. Obviously, however, this means that in this solution, at least the end areas of the two busbar sections are covered by the bridging and, accordingly, no contact for consumers is possible in the transition area.

The present invention is therefore based on the object of specifying an alternative possibility of coupling busbar sections to one another, whereby preferably there should continue to be a continuous contact possibility, but at least the non-contactable area should be reduced to a minimum in the longitudinal direction.

The object is achieved by a busbar with the features of the independent claims. Advantageous developments of the invention are the subject of the dependent claims.

The present invention proposes alternative connection options which, compared to the connection element used in the “TECTON” system described above, have a simpler structure. In spite of everything, even in the case of the solutions according to the invention, an almost complete contact possibility is achieved.

According to a first aspect of the invention, electrical connectors are used to connect two successive busbar sections, which connect the line sections to one another on a rear side opposite the contacting side. According to this first aspect, a busbar for lights or electrical loads is proposed which has several busbar sections that can be connected to one another, with at least one longitudinal line for power supply and / or signal transmission being provided, which in grooves open to one contacting side of an insulating Material existing line receiving structure is arranged, wherein electrical connectors are provided in the connection area of two successive busbar sections, to which the front ends of two line sections to be connected are connected, and wherein according to the invention the electrical connectors connect the line sections on a rear side opposite the contacting side.

The rear connection of the line sections means that the front ends of the busbar sections to be connected can be brought together to an extremely small distance. In particular, a distance can be selected which ensures that the legal regulations with regard to preventing accidental contact with the current-carrying lines are complied with. At the same time, this means that the line to be contacted is only interrupted over an extremely short section or - as described below with reference to a preferred exemplary embodiment - in spite of everything, an in principle continuous contacting option is even created.

It is preferably provided here that the electrical connectors are formed by a socket contact connected to a first line section and a plug contact connected to the second line section. In particular, the plug contact can have a protruding, rod-like contact element which is provided for contacting the socket contact and is oriented essentially parallel to the line sections to be connected to one another. Both contact elements, i.e. socket contact and plug contact, are each arranged outside the line receiving structure on the rear side thereof, whereby they are then preferably each connected via a clamping contact to an end area of the line sections to be connected and the clamping contact through rear openings in the line receiving structure in the for mounting the Line sections provided groove engages. The above-described configuration of the electrical connector means that the busbar sections fitted with them can be connected to one another in a simple manner by a plugging process, and the electrical connection is then immediately established. Thus, a simple connection option is created, which in particular also optimizes the assembly of the system.

As already mentioned, the solution according to the invention allows the end faces of the busbar sections to be connected to one another to be brought together very closely, so that only an extremely small gap remains. If a contact option is to be created in this intermediate space as well, a particularly preferred embodiment can provide that one of the line sections to be connected protrudes slightly beyond the line receiving structure and thus protrudes into this intermediate space. Any remaining gap between the two line sections is thereby reduced to a minimum.

An alternative solution to the present problem according to a second aspect of the present invention provides that at the end of one of the

Line sections a resilient pin contact protruding from the line receiving structure is arranged, which is designed for contacting the opposite end of the further line section. In this case, when two busbar sections are joined together at the end, the end regions of the line sections are brought into direct contact with one another without an additional electrical connector having to be used for this purpose.

According to this second aspect of the invention, a busbar for lights or electrical loads is proposed which has several busbar sections that can be connected to one another, each having at least one in

Have longitudinally running line for power supply and / or signal transmission, which is arranged in grooves, which are open towards a contacting side, of a line receiving structure made of an insulating material, the corresponding line section having a pin contact protruding relative to the line receiving structure at the end region of one of the two busbar sections to be connected to one another, which is designed to make contact with the opposite end of the further line section.

It is preferably provided here that the pin contact has an axially resiliently mounted contact element. This ensures, on the one hand, that the two ends of the line sections come into contact with sufficient force and, accordingly, a continuous electrical connection is ensured. On the other hand, the axially resilient mounting can also do this are used to absorb relative displacements of the two busbar sections at least to a certain extent. It can also be provided here that a bearing sleeve for the pin contact is arranged in the groove of the line receiving structure and consists of an electrically conductive material. Also over the length of the bearing sleeve is thus a

Contacting possibility for lights or other consumers created.

The busbar according to the invention preferably has a plurality of lines running parallel to one another. The proposed solutions make it possible in particular to have all lines run next to one another in one plane. This is due to the fact that the solutions take up very little space. An even closer routing of the lines can, however, be achieved according to an alternative variant if the lines with their associated connection measures run alternately in two different planes.

Overall, a possibility is thus created of coupling busbar sections to one another in a simple manner and, in spite of everything, creating an essentially seamless contacting possibility.

The invention will be explained in more detail below with reference to the accompanying drawing. Show it:

FIG. 1 shows the connection of two line sections of a busbar according to a first aspect of the invention in an exploded view;

FIG. 2 shows the busbar sections configured according to the first exemplary embodiment before being joined together; FIG. 3 shows the busbar sections in the assembled state;

FIG. 4 shows a multi-core busbar which is brought together in accordance with the first aspect of the invention; FIGS. 5 and 6 representations to clarify the contacting possibilities in the area of the transition between two busbar sections; FIGS. 7 and 8 representations of an advantageous further development of the first exemplary embodiment according to the invention;

FIGS. 9 and 10 representations of a second advantageous development of the first exemplary embodiment according to the invention;

FIGS. 11-14 are views of a possibility of connecting two end faces

Busbar sections according to a second aspect of the invention;

FIG. 15 shows an electrical connection contact known from the prior art, and FIG

FIG. 16 shows a procedure known from the prior art for connecting two successive busbar sections.

The connection of two busbar sections, each with a single line, according to a first exemplary embodiment of the invention will first be explained with reference to FIGS. 1-3. As will be shown later, this exemplary embodiment can, however, easily be expanded to include multi-core busbars.

FIG. 1 initially shows the components forming the first exemplary embodiment in an exploded view, initially showing two busbar sections 10 and 20 which are to be connected to one another. Each busbar section 10, 20 here has a line section 11 or 21, which is preferably in the form of a copper line. In a known manner, these line sections 11 and 21 are arranged in corresponding line receiving structures 12 and 22, which consist of an insulating material and are designed in such a way that they make contact with the

Allow lines 11, 21 from one contacting side. For this purpose, the line receiving structures 12, 22 form channels 13 extending in the longitudinal direction,

23, which are open towards the contacting side, in the illustration in FIG. 1 towards the underside and in which the lines 11, 21 are received. The lines 11, 21 are thereby protected from accidental contact, since the

Receiving channels 13, 23 are designed such that touching the surface of one of the conductors 11, 21 by a user is excluded. The relevant standards for this require a so-called test finger, which is explained in more detail below cannot penetrate so far into the receiving channels 13 or 23 that it touches the lines 11, 21.

If several such busbar sections are joined together to form an elongated busbar, it must be ensured in spite of everything that there is an electrical connection between the line sections 11 and 21. In the first exemplary embodiment according to FIG. 1, it is provided for this purpose that an electrical connector provided with the reference numeral 30 is used, which automatically establishes the desired electrical connection when the busbar sections 10, 20 are joined together at the end.

The electrical connector 30 according to the invention is essentially constructed in two parts in the exemplary embodiment shown and has a socket contact 32 on the one hand and a plug contact 34 on the other. As Figure 2 shows in more detail, socket contact 32 and plug contact 34 are already arranged on them before the busbar sections 10, 20 are joined together, with a rod-like contact element 35 of the plug contact 34 then engaging in the socket contact 32 when the busbar sections 10, 20 are joined together, so that ultimately the in Figure 3 recognizable connection is obtained. For this purpose, the socket contact 32 has a clamping spring contact 33 into which the end of the rod-like contact element 35, which tapers on the front side, is inserted. The spring contact 33 ensures, on the one hand, that there is a reliable electrical connection; on the other hand, a mechanical clamping force is also achieved which at least makes it more difficult to unintentionally detach the two busbar sections 10, 20 from one another.

Both socket contact 32 and plug contact 34 are, as already mentioned, already connected to the busbar sections 10, 20 before they are joined together, but in particular connected to the respective line sections 11, 21. For this purpose, corresponding clamping contacts 36 are provided, which engage in the receiving channels 13 and 23 of the line receiving structures 12, 22 and here grip around the line sections 11, 21 in a clamping manner. For this purpose, the line receiving structures 12, 21 have openings or recesses in the form of, for example, slots 15, 25, into which the arms of the clamping contacts 36 can engage, on the rear side opposite the contacting side. The components of the electrical connector 30 are thereby sufficiently secured to the respective busbar sections 10 and 20, so that the electrical connection can be achieved by a simple plugging movement of both busbar sections 10, 20 towards one another. Ultimately results Then, in the assembled state, an arrangement as can be seen in FIG. 3.

FIG. 3 also shows that in the joined state the end regions of the two line receiving structures 12, 22 are only at a small distance d from one another. In particular, this distance d is dimensioned in such a way that the test finger shown here cannot touch either of the two line sections 12, 22, but in particular also cannot touch any components of the electrical connector 30

The distance d between the two busbar sections 10 and 20 is preferably selected in such a way that the requirements of the corresponding standard are also met, taking into account the thermal expansions and manufacturing tolerances. In particular, it is preferably provided that the test finger - as shown - can actually only dip into the remaining gap to a very small extent, since this - as explained in more detail below - opens up the possibility of even further improving the contact options in the transition area. First of all, however, it should be made clear with the aid of FIG. 4 that the first exemplary embodiment of the connection according to the invention of two busbar sections can easily be extended to multi-core busbars as well. It can be seen that in this case, corresponding electrical connectors 30 are provided for each individual line section to be connected on the rear side of the line receiving structure. Since the individual components of the electrical connector 30 only have a small width in a direction perpendicular to the longitudinal direction of the busbar 10, 20 and in particular do not exceed the width of an individual channel of the line receiving structure, a lateral arrangement of several electrical connectors 30 next to one another, as shown in FIG 4 is easily possible.

The arrangement shown in FIG. 4 is then preferably received in the support rail profile of an elongate support rail (not shown). The mounting rail profile must then of course be designed in such a way that the components of the electrical connector 30 can be accommodated in a suitable manner. For this purpose, the conductor levels are spaced from the rear wall of the support profile in accordance with the increased space requirement. The connector area is preferred for Support rail profile insulated. This is usually done by means of appropriate connector elements, brackets, busbar features.

The rod-like contact elements 35 cannot be reached from the underside, that is to say the contacting side, not even for the contacting elements of consumers to be connected to the busbar. Schematically shown for this in Figure 5 is a contact element 50, which, for example, can be part of a lamp to be connected to the busbar or another consumer and has a contact tongue 51, which is designed to be inserted into the receiving channels 13 or 23 of the line support structures in a known manner 12, 22 to intervene and to contact the lines 11, 21 here. If the contact tongue 51 is very narrow, as shown in FIG. 5, there is at least the theoretical possibility of positioning the consumer to be connected in such a way that the tongue 51 is positioned exactly in the gap of the transition between two busbar sections 10, 20 to be connected is. Here the tongue 51 cannot reach either the line sections 11, 21 or the rod-like contact element 35. Accordingly, in the embodiment shown, there is an interruption with regard to the contacting possibility, at least within very certain limits.

In order to circumvent this problem, a choice can be made between different solutions, which are to be explained in more detail below with reference to FIGS. 6-10. According to FIG. 6, a simple solution would, for example, consist in designing the loads with double contacts 50, 52 which are arranged next to one another. The contact tongues 51 and 53 of the double contact are at a distance D from one another which - ideally clearly - exceeds the gap width d. This ensures that, in principle, at least one of the two contacts 50, 52 with its contact tongue 51 or 53 meets a line section of the two busbar sections 10, 20.

The solution shown in Figure 6 then also requires a doubling of the contact securing. If, for example, it is to be ensured that a current flow of, for example, 2 amps is enabled via the contacting of the lines, then each of the two individual contacts 50, 52 alone must ensure a current flow of 2 amps, which means that in most situations even 4 amp are guaranteed, since as a rule the double contact with both contact tongues 51, 53 will hit the line sections.

Another solution, not shown in the figures, would consist in widening the contact tongue 51 of the contact 50 in such a way that it is wider than the largest possible gap between the busbar sections 10, 20 connected to one another. In this case, too, it is ensured that the contact tongue 51 always strikes at least one line section, although this variant also requires a somewhat oversized configuration of the components provided for contacting.

Finally, it would also be conceivable to design the consumers to be connected in such a way that either the contact tongue 51 or the entire contact 50 is designed to be easily displaceable. In the event that a consumer is actually to be located exactly at the interface between two adjacent busbar sections 10, 20, the contact 50 or contact tongue 51 may have to be shifted slightly if otherwise no reliable contacting of the busbar is guaranteed.

The measures described so far, which also made it possible to make contact with the busbar in the transition area, concerned the design of the consumer itself or of the contacting element of the consumer. Another possibility of creating an almost continuous contact is shown in FIGS. 7 and 8 or 9 and 10.

Here, it can be seen in FIGS. 7 and 8 that one of the two line sections 11, 21 protruding beyond the line receiving structure 12, 22 is slightly extended or is provided with a protruding contact. In the exemplary embodiment shown, a short sleeve 27 is provided which protrudes beyond the line receiving structure 22 and projects into the remaining gap between the two busbar sections 10, 20. The use of the sleeve 27 leads to a very small design and, in its form, does not serve to electrically connect the two conductor ends. You should only protrude into the gap and thereby extend one of the two ends of the conductor.

Because the distance between the two insulating line receiving structures 12, 22 is dimensioned in such a way that - as shown in FIG protruding conductor area or the sleeve 27 is touched, compliance with the corresponding standard, which is intended to prevent accidental contact with current-carrying components, is again guaranteed.

In addition to the shape of the illustrated sleeve, basically any type of extension is conceivable that does not collide in its extension with the opposite end of the line. Lateral conductor walls 28 along the circumference of the conductors are also conceivable, for example formed from elongated spring forms of the clamping contacts, as shown in FIGS. 9 and 10. In this case, however, particular care should be taken that the extension does not significantly increase the cross section of the line sections 11, 21 to be connected to one another, since a compact arrangement of the lines is still desired.

In the case of the variants of FIGS. 7-10, in the connected state, as shown in FIGS. 8 and 10, there is again an almost complete contact possibility. The remaining gap between the front end of the conductor on the one hand and the end of the extension 27 or 28 on the other hand is so small that it is guaranteed in any case that a contact tongue of a consumer can touch live parts.

Another possibility for connecting line sections according to a second aspect of the invention is shown in FIGS. 11-14, FIG. 11 initially showing an exploded view of the arrangement.

Again, two busbar sections 110, 120 are to be connected to one another, with corresponding line sections 111, 121 running within corresponding line receiving structures 112, 122. In the solution proposed here, it is now provided that when the busbar sections 110, 120 are joined together, the lines 111, 121 are directly pressed together in order to achieve contact. For this purpose, it is provided in particular that an end area of one of the two lines 111, 121, in the present case the line 121, is designed with a protruding pin contact 130, the end area of which is intended to touch and contact the end face of the other line section 111. In particular, it is provided that the pin contact 130 is mounted in an axially resilient manner and in alignment with the associated line section 111, 121, so that it presses permanently on the line end 111 with a corresponding spring force when it is joined, and thus also when there is a potential Relative displacement to one another, electrical contact is still permanently guaranteed.

The resilient mounting of the pin contact 130 is made possible with the aid of a bearing sleeve 135 which is integrated into the end region of the line holding profile 122 and is connected at its rear end to the actual line 121. A spiral spring 136 is arranged inside the bearing sleeve 135 and presses with its front end against a rear end of the pin contact 130. A ring-like widening 131 on the pin contact 130 prevents the spring 136 from pushing the pin contact 130 beyond the front end of the sleeve 135 or the pin contact 130 from falling out of the sleeve 135.

Either the pin contact 130 itself or the opposite conductor end 111 here has a shell-like or funnel-like extension which makes it easier to bring the contacting end faces together. In FIGS. 11 and 13, the opposite conductor end 111 is provided with a corresponding exception shape 116; in FIGS. 12 and 14, the pin contact 130 has the corresponding extension 138.

Before the busbar sections are joined together, a configuration such as that shown in FIG. 14 results. It can be seen here that the end region of the pin contact 130 again protrudes beyond the line receiving structure 122, so that when the two busbar sections 110, 120 are joined together, it will actually come into contact with the front end of the conductor. In the assembled state, the result is a configuration as shown in section in FIG. 13, whereby it can be seen that, with the help of the spiral spring 136, the pin contact 130 actually presses permanently against the opposite end of the conductor.

The pin contact 130 as well as the outer circumference of the bearing sleeve 135, which is made of a conductive material, ensure that a continuous contact is created for consumers to be connected. Again, a completely flexible arrangement of lights or consumers is made possible.

Also in the illustrated second exemplary embodiment according to the invention, the busbar sections to be connected to one another can have a plurality of conductors running parallel to one another. In all of the exemplary embodiments shown, it would be conceivable to arrange the lines in one plane. Possibly. However, the lines could also be stored in such a way that they run in two different planes, in particular alternately in two different planes. This wave-like arrangement of the lines of the busbar allows, if necessary, an even more compact arrangement of the lines seen in the transverse direction, since this makes it easier to arrange them

Minimum distances with regard to the required creepage distances can be maintained. The resulting different depths with regard to the surfaces of the lines to be contacted must then, however, be taken into account for the corresponding consumers. On the one hand, this leads to a certain amount of additional work in the implementation of the contacting elements of the consumers, on the other hand, the number of available contactable lines can be increased, whereby additional contacting possibilities are created. These can then be used to optionally assign the loads to be connected to different power supply circuits so that they each fulfill a corresponding special function.

Claims

Expectations

1 . Busbar for lights or electrical units, with several busbar sections (10, 20) that can be connected to one another, each of which has at least one longitudinally running line for power supply and / or signal transmission, which in grooves (13, 23) open to one contacting side is one of a insulating material existing line receiving structure (12, 22) is arranged, electrical connectors (30) being provided in the connection area of two successive busbar sections (10, 20) to which the front ends of two line sections (11, 21) to be connected are connected, characterized in that the electrical connectors (30) connect the line sections (11, 21) on a rear side opposite the contacting side.

2. Busbar according to claim 1, characterized in that the electrical connectors (30) comprise a socket contact (32) connected to a first line section (11) and a plug contact (34) connected to the second line section (21).

3. Busbar according to claim 2, characterized in that the plug contact (34) has a protruding, rod-like contact element (35) which is provided for contacting the socket contact (32) and is essentially parallel to the line sections (11, 21) to be connected to one another. is aligned.

4. Busbar according to claim 2 or 3, characterized in that the socket contact (32) and the plug contact (34) are each arranged outside the line receiving structure (12, 22) on the rear side thereof.

5. Busbar according to claim 4, characterized in that the socket contact (32) and the plug contact (34) each have a clamping contact (36) with an end region of the line sections to be connected (11, 21), the clamping contact (36) engaging through rear openings (15, 25) in the line receiving structure (12, 22) in the groove (13, 23) provided for mounting the line sections (11, 21).

6. Busbar according to one of the preceding claims, characterized in that one of the line sections to be connected (11, 21) protrudes beyond the line receiving structure (12, 22) or is provided with an extension (27, 28).

7. busbar according to claim 6, characterized in that the extension is formed by a sleeve (27) made of an electrically conductive material.

8. Busbar for lights or electrical consumers, with several interconnectable busbar sections (110, 120) each having at least one longitudinal line for power supply and / or signal transmission, which are made of an insulating material in grooves open to one contacting side Line receiving structure (112, 122) is arranged, with electrical connectors being provided in the connection area of two successive busbar sections (110, 120) to which the front ends of two line sections (111, 121) to be connected to one another are connected, characterized in that the electrical Connector comprises a pin contact (130) arranged at the end region of one of the line sections (111, 121) and protruding from the line receiving structure (112, 122), which is used for contacting the opposite end of the further line section (111, 121) is formed.

9. busbar according to claim 8, characterized in that the pin contact (130) is axially resiliently mounted.

10. Busbar according to claim 9, characterized in that a bearing sleeve (135) for the pin contact (130) is arranged in the groove of the line receiving structure (112, 122) and consists of an electrically conductive material.

11. Busbar according to one of claims 8 to 10, characterized in that the pin contact (130) or the opposite end of the line section (111) to be connected to the pin contact has an extension, in particular a shell-like or funnel-like extension.

12. Busbar according to one of the preceding claims, characterized in that it has a plurality of lines running parallel to one another.

13. Busbar according to claim 12, characterized in that all lines run in one plane.

14. Busbar according to claim 12, characterized in that the lines run alternately in two mutually offset planes.