ELECTRICAL UNIT FOR CONNECTION TO A SUPPORT RAIL AND CONTACTING ELEMENT

Description

[0001] The present invention relates to an electrical unit, for example a luminaire, which is intended for connection to a support rail having an elongated support rail profile in which at least one busbar with contactable lines extending in the longitudinal direction is arranged. Furthermore, the present invention relates to a contacting element for such an electrical unit and a strip lighting system.

[0002] Mounting rails with a mounting rail profile and a conductor rail held in the mounting rail profile are known from the prior art and are used, for example, to create elongated so-called continuous-row lighting systems. One known continuous-row lighting system is marketed by the applicant under the name "TECTON" and is characterized by the fact that luminaires or other electrical units can be flexibly positioned on the mounting rail along the entire length of the system. This is made possible by the fact that, thanks to a special mounting of the conductor rail cables, they are accessible to the consumers over essentially the entire length of the continuous-row lighting system, so that contact with the cables can be made not only at fixed positions, but at any location.

[0003] The Figures 10 and 11show views of such a light line system, as is known for example from WO 2001 / 091250 A1, wherein Figure 10 a sectional view of the light strip system with the luminaire arranged on it and Figure 11 shows the part of a luminaire to be connected to the lighting system that is relevant for contacting.

[0004] It can be seen that this known strip lighting system 100 uses an elongated, U-shaped, downwardly open support rail profile 101, which, with the two side walls 102 and the upper connecting wall 103, defines an elongated receiving space that is open towards the bottom. A busbar 110, 120 is then arranged on the inner sides of each of the side walls, each of which has a plurality of longitudinally extending wires or lines 111, 121 that are arranged in elongated channels of a line receiving structure 112, 122 made of an insulating material. The channels 112, 122 ensure secure storage of the lines 111, 121 and are each open towards the interior of the support rail profile 101.

[0005] A luminaire 130 to be connected to the light strip system 100 then has at least one rotatably mounted contacting element 135, as is shown in particular in Figure 11can be seen. To connect the luminaire 130, it is placed from the bottom side onto the mounting rail profile 101, whereby the contacting element 135 is inserted into the mounting rail profile 101 and then rotated by approximately 45°. Contacts 136 arranged on the contacting element 135 are designed in such a way that they are pivoted out laterally by the rotation and then - as shown in Figure 10 shown - engage in the receiving channels 112, 122 of the busbars 110, 120 in order to contact the corresponding lines 111, 121.

[0006] In the Figures 10 and 11In the strip lighting system shown, the lines 111, 121 of the busbars 110, 120 are arranged such that they run parallel one above the other in a vertical plane. Similarly, the contacting element 135 is designed such that the individual contacts 136, which are provided for contacting one of the two busbars 110, 120, are lined up one above the other in a common plane, with the position of a contact 136 corresponding to a (height) position of a line 111, 121. In the case shown, contacts 136 are arranged on both sides of the contacting element 135 in order to be able to contact the busbars 110, 120 positioned on both side walls 102 of the support rail profile 101.Because the contacts 136, with their contact housing and the cable connected to it, can be moved vertically relative to the contacting element 135, they can be locked according to the position of a desired line 111, 121 and then contact the corresponding line 111, 121. This allows for phase selection as well as neutral selection.

[0007] For longer luminaires in such a continuous-row system, it is also common to use two such contacting elements to attach the luminaire to the support rail profile. These contacting elements are arranged at a distance from one another on a support element of the luminaire. One of the two contacting elements is used for mechanical fastening and also for contacting the cables, while the other contacting element serves only for mechanical fastening. Such a solution is described, for example, in EP 2 151 899 A2.

[0008] A busbar for supplying multiple connected loads is also known from WO 2017 / 007420 A1. The aluminum support profile, extending in a longitudinal direction, has two elongated channels on either side of the longitudinal axis, in which the lines of a power supply network to be contacted run. The channels have different depths. A load to be connected to the busbar has a rotatable contacting part with laterally projecting arms, each of which carries a contact and is adapted to the position and depth of the channels. This ensures that the contacting part can only be arranged in the correct orientation on the busbar.

[0009] While it would be fundamentally possible to route the busbar conductors relatively close together and still comply with the relevant standards regarding required creepage distances, the individual contacts, including their insulation or housings, require a certain amount of space to be manufactured and used effectively. The space required by the contacts is greater than that required by the busbar conductors, so the spacing between the conductors of a busbar must be coordinated with the design of the contacts of the contacting element. Ultimately, this results in the conductors being spaced apart at a distance greater than actually required by the relevant standard.

[0010] The present invention is based on the objective of providing a way to arrange significantly more cables in the same available space within a mounting rail profile, while still allowing contact between all the cables. In particular, a way is to be provided to design electrical components in such a way that they can efficiently contact closely spaced cables on a busbar.

[0011] The object is achieved by an electrical unit having the features of claim 1 and by a contacting element according to claim 10. Advantageous developments of the inventions are the subject of the dependent claims.

[0012] The solution according to the invention is based on a busbar in which the lines do not all run parallel to one another in one plane, but instead an alternating arrangement of the lines is provided such that they run alternately in two spaced-apart, yet parallel, planes. Busbars designed in this way are already known in principle from the prior art, although very close routing of the lines can lead to difficulties in making contact.

[0013] According to the invention, it is therefore proposed that the electrical unit, which has a plurality of contacts for contacting the lines of the busbar, is designed such that a first group of contacts and a second group of contacts are present, wherein the contacts of the first group are arranged with respect to an axis of rotation of a rotatable contacting element such that they are pivoted out by rotation such that they contact the lines of the busbar running in a first plane, whereas the arrangement of the contacts of the second group with respect to the axis of rotation of a contacting element is such that they are pivoted out by rotation such that they contact the lines of the busbar running in a second plane.

[0014] According to the present invention, the two contact groups are mounted differently, which means that they no longer need to be arranged vertically directly above one another, as in the prior art. This opens up the possibility of arranging the entire set of contacts with smaller vertical spacing from one another, so that ultimately, even with very close routing of the lines of a busbar, it is ensured that - at least theoretically - all the lines of the busbar can be contacted by rotatable contact elements.

[0015] According to the invention, an electrical unit, in particular a luminaire, is proposed which is intended for connection to a support rail, which has an elongated support rail profile which, with two side walls, encloses a receiving space in which at least one busbar with contactable lines running in the longitudinal direction is arranged, wherein the lines of the busbar run alternately in at least two planes aligned parallel to one another and spaced from one another, wherein the electrical unit according to the invention has means for contacting the lines of the busbar, which comprise at least one rotatable contacting element, on the outer circumference of which contacts are arranged, which are pivoted out by rotating the contacting element and brought into contact with the lines to be contacted,and wherein, according to the invention, the means for contacting the lines comprises a first group of contacts and a second group of contacts, wherein the contacts of the first group are arranged with respect to a rotational axis of the contacting element such that they are pivoted out by rotating the contacting element such that they are capable of contacting the lines running in a first plane, and wherein the contacts of the second group are arranged with respect to a rotational axis of the contacting element such that they are pivoted out by rotating the contacting element such that they are capable of contacting the lines running in a second plane. According to the invention, at least one of the contacts is mounted on the contacting element in a height-adjustable manner, whereby this contact can only assume positions corresponding to one of the two groups.

[0016] In a first variant of the inventive concept, the two contact groups are arranged on two separate, rotatable contact elements. Since, particularly in the case of a continuous-row lighting system, the loads to be connected, which primarily consist of luminaires, have a certain length, two rotatable contact elements are generally provided anyway to enable reliable mechanical fastening of the luminaire to the mounting rail. Previously, only one of the contact elements was actually used to contact the cables and featured corresponding contacts, while the second contact element was intended purely for mechanical locking to the mounting rail.According to the present invention, the further contacting element can now also be equipped with contacts, which, however, as already explained, are mounted in such a way that they can contact other lines than the contacts of the first contacting element.

[0017] According to a second variant of the present invention, however, it is also possible to arrange the contacts of the first group and the contacts of the second group on a common rotatable contacting element. To ensure that both contact groups can contact the lines running in different planes, the contacts of the first group are spaced at a different distance from the rotational axis of the contacting element than the contacts of the second group. Furthermore, the contacts of the first group can be arranged at an angle offset from the rotational axis of the contacting element relative to the contacts of the second group, so that the two contact groups do not collide with each other.

[0018] In both variants, as already mentioned, the invention provides for at least one of the contacts to be height-adjustable, for example, to enable phase selection. This contact can then only assume positions that correspond to the positions of the corresponding contact group. Continuous adjustment of the contact, however, is not desired, as this would not guarantee that the contact would actually reliably contact the desired conductor on the busbar.

[0019] Furthermore, according to the present invention, a contacting element is proposed for connecting an electrical unit to a mounting rail, which has an elongated mounting rail profile which, with two side walls, encloses a receiving space in which at least one busbar with contactable lines running in the longitudinal direction is arranged, wherein the lines of a busbar run alternately in at least two planes aligned parallel to one another and spaced from one another, wherein the contacting element is rotatable and contacts are arranged on its outer circumference, which contacts are pivoted out by rotating the contacting element and brought into contact with the lines to be contacted, and wherein the contacting element has a first group of contacts and a second group of contacts, wherein the contacts of the first group are arranged with respect to a rotational axis of the contacting element in such a way thatthat they are pivoted out by rotating the contacting element such that they contact the lines running in a first plane, and wherein the contacts of the second group are arranged with respect to a rotational axis of the contacting element such that they are pivoted out by rotating the contacting element such that they contact the lines running in a second plane. At least one of the contacts is mounted on the contacting element in a height-adjustable manner, whereby this contact can only assume positions corresponding to one of the two groups.

[0020] The invention will be explained in more detail below with reference to the accompanying drawings. They show: Figure 1 shows a sectional view of a support rail of a lighting system with two busbars arranged therein and a luminaire arranged on the support rail; Figure 2 shows a schematic representation to explain the positioning of the lines of the busbars and the resulting problems with regard to contacting the lines; Figures 3 and 4 show views of an embodiment of a luminaire which is designed with contacting means according to the invention; Figure 5 shows an enlarged view of the contacting means of the luminaire of the Figures 3 and 4; Figure 6 shows a representation of the contacting options resulting from the solution according to the invention; Figure 7 shows a detailed representation of the arrangement according to the invention of two contact groups on a common contacting element; Figures 8 and 9 show views of two different variants of a contacting element designed according to the invention; Figures 10 and 11 show the design of a strip light system and an associated luminaire according to a solution known from the prior art.

[0021] The representation in Figure 1 basically corresponds to the representation of the state of the art according to Figure 10 . Again, a support rail 50 of a strip lighting system with a luminaire arranged thereon is shown, although now a modified guide is provided for the conductor rail cables.

[0022] In principle, however, the Figure 1The mounting rail 50 shown has an elongated mounting rail profile 55, approximately U-shaped in cross-section and open at the bottom, with two side walls 56 and a cross-connecting wall 57, which enclose a receiving space open towards the bottom. Furthermore, busbars 60 are provided on both sides of the receiving space, again adjacent to the side walls 56, each of which has a line receiving structure 62 made of an insulating material extending in the longitudinal direction of the mounting rail 50, which forms elongated channels or grooves in which lines 70 to be contacted are arranged.

[0023] A special feature of the Figure 1 The advantage of the busbars 60 shown is that the line receiving structures 62 are designed in such a way that the lines 70 are no longer all arranged in one plane above one another as has been the case up to now, as is the case in the illustration in Figure 10Instead, there is an alternating arrangement of the lines 70, such that they are arranged alternately in two spaced-apart, parallel planes. These planes are in Figure 2 and labeled A1, B1 (for the left busbar) or A2 and B2 (for the right busbar).

[0024] A first part of the cables 70 of the left busbar 60 thus runs in plane A1 and thus closer to the area of ​​the corresponding side wall 56 of the support rail profile 55, while the second part of the cables 70 is arranged in plane B1, which has a greater distance from the corresponding side wall 56. This alternating arrangement of the cables 70 means that with regard to the distances to be maintained for corresponding creepage distances, not only the vertical distance between the cables 70 must be taken into account, but also the distance between the two planes A1 and B1 (the same applies, of course, to the cables of the right busbar, which are alternately located in planes A2 and B2), so that ultimately the total number of cables 70 can be increased. A comparison with the representation in Figure 10shows that now, with comparable heights of the busbars 60, 110, 120, the number of cables 70 can be increased, which would ultimately lead to an increase in the contacting options for units to be connected to the mounting rail.

[0025] The Figures 1 and 2 However, they also show that a denser arrangement of the lines 70 of the busbar 60 alone does not result in a unit to be connected to the system 50 actually being able to use the additional contacting options. The figures show a luminaire 1 whose contacting element is comparable to that of the luminaire 130 in Figure 10It can be seen that the rotatably mounted contacting element 10 in turn has contacts 20 opposite one another on both sides, each of which has an outwardly projecting contact element 22 held by a contact housing 21 made of an insulating material.

[0026] On the left side are the Figures 1 and 2 Three contacts 20 are shown here, arranged one above the other, which contact lines 70 of the busbar 60 located in the plane B1. The vertical spacing of these lines 70 from one another is such that each of these lines 70 can be contacted by a single contact 20 of the luminaire 1.

[0027] However, it is also evident that between two contacts 20 arranged one above the other, there is no further free space left for another contact capable of contacting the line 70 located between two lines 70 running in plane B1 in plane A1. This means that while the lines 70 designated by positions C1 and C2 can be contacted without any problems, the line 70 located vertically in between, in position D1, cannot be contacted.

[0028] Since the available space is already essentially exhausted by the stacked arrangement of the contacts 20 for contacting the lines running in plane B1, a more compact arrangement of the lines 70 of the busbars 60 alone cannot increase the flexibility of the contacting options. Instead, a corresponding refinement of the components to be connected to the support rail 50 is also required, with inventive solutions for this being explained in more detail below.

[0029] A first embodiment of the invention is shown in the Figures 3 - 6 shown. The Figures 3 and 4 show views of an elongated beam light, which is in the Figure 1 shown manner to the support rail 50 and for this purpose has rotatably mounted contacting elements 30 and 40, respectively. Figure 5shows an enlarged view of the contacting elements 30, 40. These are arranged distributed along the elongated support 5 of the luminaire 1, which serves, for example, to hold the lamps, an optic 6 used to influence the light output, and an operating device 7 for operating the lamps.

[0030] Previously, a bar luminaire connected to a mounting rail was generally provided with at least two rotatable contact elements to enable mechanical fastening of the luminaire to the mounting rail profile at two longitudinal positions. However, until now, only one of the two contact elements was used to actually contact the conductors of the busbars.

[0031] In the inventive solution of the Figures 3 - 5However, it is provided that both contacting elements 30 and 40 now carry contacts intended for contacting the lines of the busbars 60. However, both contacting elements 30 and 40 are not identical. Instead, the contacts provided thereon are arranged such that the contacts of one contacting element contact only lines of one of the two levels A1 or A2, while the contacts of the other contacting element contact the lines of the other level B1 or B2.

[0032] This can be seen in Figure 5, wherein it is shown that the contacts 32 arranged on the left contacting element 30 contact the inner levels B1 and B2 - with respect to the center of the support rail - and thus the corresponding lines of the busbar, whereas the contacts 42 of the right contacting element 40 contact the outer levels A1 and A2. The contacts 32 of the first contacting element 30, in the totality of all contacts of the luminaire 1, therefore form a first contact group, which is basically intended to contact the lines running in the inner levels B1 and B2, whereas the contacts 42 of the second contacting element 40 form a second group, which is intended to contact the lines of levels A1 and A2.

[0033] However, as can be seen from Figure 1As is clear, there is sufficient space available for contacts 70 arranged one above the other, which are only intended to contact lines of a single level, so that these - analogous to the arrangement of the contacts 20 as shown in the Figures 1 and 2 shown - can now be easily arranged one above the other and can contact all cables that run in one plane. This ultimately means that by using the second contacting element 40 to support additional electrical contacts 42, it is possible to contact all cables 70 of the two busbars 60. Thus, when connecting the luminaire 1 to the support rail 50, the full extent of the cables 70 can now be used for contacting, thus offering a wide variety of options for connecting the luminaire 1 to specific phases of the power supply circuits or specific cables for signal transmission.

[0034] Preferably, the contacts 32 and 42 of the two contacting elements 30 and 40 are of the type shown in the Figures 3 to 5illustrated luminaire 1 are designed identically. The two contact groups differ primarily with regard to their arrangement on the contacting elements 30 and 40. Since, for example, the contacts 42 of the second contacting element 40 are intended to contact the lines running in the more outer planes A1 and A2, it is necessary for these contacts 42 to have a correspondingly greater distance with respect to the axis of rotation I, about which the contacting elements 30, 40 are pivoted, than is the case for the contacts 32 of the first contacting element 30. In this case, a corresponding modification must therefore be made to the second contacting element 40 with regard to the mounting of the contacts 42. Alternatively, it would also be conceivable in principle to lengthen the contact tongues of these contacts 42 accordingly. Furthermore, the contacts 42 are also vertically or horizontally pivotable.positioned slightly offset from the contacts 32 in a direction parallel to the pivot axis I, since the height-staggered arrangement of the corresponding lines in the two levels A1 and B1 must also be taken into account.

[0035] Ultimately, however, the contacting of busbars can be improved in a relatively simple way and, in particular, the number of lines to be contacted can be increased. Figure 6 shows which in their representation Figure 1 and in which the rear contacting element 40, seen in the longitudinal direction, is largely covered by the front contacting element 30, the luminaire 1 can now theoretically contact all lines 70 of the two busbars 60.

[0036] In the Figures 3 - 6In the variant shown, the two groups of contacts 32, 42 formed according to the invention are arranged on different contacting elements 30, 40. However, this does not necessarily have to be the case, as will be shown below with reference to the Figures 7 - 9 which show a second embodiment of a corresponding contacting element 50 according to the invention.

[0037] Figure 7 shows a top view of a portion of a contacting element 50, which in the illustration carries two contacts 52 and 53, which are intended to contact two lines 72 and 73 arranged offset relative to one another. The two lines 72 and 73 are not only arranged offset relative to one another in the illustrated plane of the drawing, but also have an offset in a direction perpendicular thereto, as can be seen from the Figures 1 and 2explained. Line 72 thus corresponds to a line running in plane A1, while line 73 runs in plane B1. Similarly, the corresponding contacts 52 and 53 will also be arranged at different heights on the contacting element 50.

[0038] Figure 7shows the arrangement in the pivoted-out state of the contacting element 50, in which the contacts 52 and 53 touch the respective lines 72 and 73. It can be seen that contacting of the lines 72, 73 can be achieved in a reliable manner, since the contacts 52, 53 are mounted on the contacting element 50 in such a way that they actually come into contact with the corresponding lines 72, 73. In particular, this means that the contact 52, which is intended to contact the outer line 72, has a greater distance with respect to the axis of rotation I, around which the contacting element 50 is pivoted, than the contact 53 intended for contacting the line 73 located further inside. Furthermore, both contacts 52, 53 are arranged on the contacting element 50 offset by an angle with respect to this axis of rotation I, so that they have a sufficient distance from one another both vertically and, in particular, horizontally.Again, it is possible to arrange several similarly positioned contacts of this contact group one above the other, corresponding to the arrangement of contact 52, in order to contact the lines arranged one above the other in level A1. The same applies to contact 53, which, with correspondingly positioned contacts, is then intended to contact the lines of level B1. Thus, two groups of contacts are arranged on the contacting element 50, each of which is designed to contact the lines of the busbar in a respective level.

[0039] It is evident in Figure 7 also that at least the contacts of one of the two contact groups must be arranged slightly tilted relative to a radial axis extending from the rotation axis. This can be seen in Figure 7in particular for the contacts 52 of the first group. While the contacts 53, which are located approximately at the level of the rotation axis I, are essentially oriented radially outward, the contacts 52 of the first group form an angle α with a radial axis extending from the rotation axis. This takes into account the fact that, viewed longitudinally, the contacts of the first group 52 do not contact the lines at the level of the rotation axis I, but rather are offset from it, whereby the most optimal contacting of the lines 72, 73 is nevertheless achieved.

[0040] Figure 8 shows a complete contacting element 50 in plan view, which as in Figure 7As explained above, further contacts 62, 63 are provided opposite contacts 52, 53, which are designed in a similar manner to contact the opposite lines of the second busbar running in planes A2 and B2. Ultimately, this contacting element 50 is therefore theoretically at least capable of contacting all lines of the busbars arranged on both sides.

[0041] Figure 9 shows a slightly modified version compared to the one in Figure 8 The difference is that in the contacting state shown, the outer contacts 52 and 62 are approximately - viewed in the longitudinal direction of the busbar - at the level of the rotation axis I. However, the version shown in the Figures 7 and 8The variant shown is that the inner contact 53 or the contacts of this corresponding group are located at the level of the rotation axis I. This arrangement results in the contacting element 50 requiring less deflection to lock or unlock. It is also possible to arrange for the rotation axis to be slightly above the so-called "dead center," which ultimately results in the contacts 52, 53, 62, 63 pressing against the surfaces of the lines to be contacted with a somewhat stronger force.

[0042] The inventive designs of the contacting element(s) thus make it possible, in theory at least, to contact all of the lines even with a very compact arrangement of the lines in a busbar. In reality, however, a somewhat smaller number of contacts will be selected, although some of the contacts will then be height-adjustable or can be arranged at different heights on the contacting element in order to select which conductors of the busbar are actually to be contacted. This allows for so-called phase selection, or it can be determined which lines selected for communication a consumer to be connected will use to communicate, for example, with a control center of the system.

[0043] In this situation, it would be advantageous if the selectable conductors or phases of the power supply circuit of a busbar were grouped together on a single level. This allows the corresponding phase selection to be implemented in the conventional manner, namely by movably mounting a corresponding contact on the corresponding contacting element. However, the contact can only assume positions assigned to the corresponding group, ensuring that, regardless of its position, it only contacts the conductors running on a specific level.

[0044] Overall, this creates the possibility of making busbar connections even more flexible. This opens up a wide range of possibilities for expanding the functionality of busbar systems or, in general, strip lighting systems. Furthermore, it makes it possible to design the strip lighting system flatter overall by arranging the conductors more compactly, while maintaining the same number of conductors. It is also possible to implement strip lighting systems with more conductors in the same size.

Claims

1. Electrical unit, in particular a luminaire (1), provided for connecting to a trunking rail (50) comprising an elongate trunking rail profile (55) which, with two lateral walls (56), encloses a receiving space in which at least one busbar (60) having contactable lines (70) extending in the longitudinal direction is arranged, the lines (70) of a busbar extending alternately in at least two planes (A1, B1) which are aligned in parallel with one another and spaced apart from one another, the electrical unit comprising means for contacting the lines (70) of the busbar (60), which means have at least one rotatable contacting element (30, 40, 50), on the outer circumference of which contacting element, contacts (32, 42, 52, 53, 62, 63) are arranged which are pivoted out by rotating the contacting element (30, 40, 50) and which are brought into abutment against the lines (70) to be contacted, the means for contacting comprising a first group of contacts (32, 52, 62) and a second group of contacts (42, 53, 63), the contacts of the first group being arranged with respect to a rotational axis (I) of the contacting element (30, 40, 50) such that, by rotating the contacting element (30, 40, 50), the contacts are pivoted out in such a way that they are able to contact the lines (70) extending in a first plane (A1), and the contacts of the second group being arranged with respect to a rotational axis (I) of the contacting element (30, 40, 50) such that, by rotating the contacting element (30, 40, 50), the contacts are pivoted out in such a way that they are able to contact the lines extending in a second plane (B1); characterized in that at least one of the contacts (32, 43, 52, 53, 62, 63) is mounted on the contacting element (30, 40, 50) in a height-adjustable manner, and this contact can only occupy positions which correspond to one of the two groups.

2. Electrical unit according to claim 1, characterized in that the electrical unit comprises two rotatable contacting elements (30, 40), the contacts of the first group (32) being arranged on a first contacting element (30), and the contacts of the second group (42) being arranged on a second contacting element (40).

3. Electrical unit according to claim 2, characterized in that the two contacting elements (30, 40) are arranged spaced apart in the longitudinal direction on a carrier element (5) of the unit.

4. Electrical unit according to claim 1, characterized in that the contacts of the first group and the contacts of the second group are arranged on a common contacting element (50).

5. Electrical unit according to claim 4, characterized in that the contacts of the first group are offset by an angle to the contacts of the second group, with respect to the rotational axis (I) of the contacting element (50).

6. Electrical unit according to any of the preceding claims, characterized in that the contacts of the first group are at a greater distance from the rotational axis (I) of the contacting element (30, 40, 50) than the contacts of the second group.

7. Electrical unit according to any of the preceding claims, characterized in that the contacting element (30, 40, 50) comprises contacts which are opposite one another with respect to its rotational axis and which are designed to contact two busbars arranged on both sides of the contacting element (30, 40, 50).

8. Electrical unit according to any of the preceding claims, characterized in that it is a strip luminaire.

9. Contacting element for connecting an electrical unit to a trunking rail (50) comprising an elongate trunking rail profile (55) which, with two lateral walls (56), encloses a receiving space in which at least one busbar (60) having contactable lines (70) extending in the longitudinal direction is arranged, the lines (70) of a busbar extending alternately in at least two planes (A1, B1) which are aligned in parallel with one another and spaced apart from one another, the contacting element (30, 40, 50) being rotatable and, on the outer circumference of which contacting element, contacts (32, 42, 52, 53, 62, 63) being arranged which are pivoted out by rotating the contacting element (30, 40, 50) and are brought into abutment with the lines (70) to be contacted, the contacting element (30, 40, 50) comprising a first group of contacts (32, 52, 62) and a second group of contacts (42, 53, 63), the contacts of the first group being arranged with respect to a rotational axis (I) of the contacting element (30, 40, 50) such that, by rotating the contacting element (30, 40, 50), the contacts are pivoted out in such a way that they are able to contact the lines (70) extending in a first plane (A1), and the contacts of the second group being arranged with respect to a rotational axis (I) of the contacting element (30, 40, 50) such that, by rotating the contacting element (30, 40, 50), the contacts are pivoted out in such a way that they are able to contact the lines extending in a second plane (B1); characterized in that at least one of the contacts (32, 43, 52, 53, 62, 63) is mounted on the contacting element (30, 40, 50) in a height-adjustable manner, and this contact can only occupy positions which correspond to one of the two groups.

10. Contacting element according to claim 9, characterized in that the contacts of the first group are at a greater distance from the rotational axis (I) of the contacting element (50) than the contacts of the second group.

11. Contacting element according to claim 9 or claim 10, characterized in that the contacts of the first group are offset by an angle to the contacts of the second group, with respect to the rotational axis (I) of the contacting element (50).

12. Light trunking system comprising • a trunking rail (50) which comprises an elongate trunking rail profile (55) which, with two lateral walls (56), encloses a receiving space in which at least one busbar (60) having contactable lines (70) extending in the longitudinal direction is arranged, wherein the lines (70) of the busbar extend alternately in at least two planes (A1, B1) which are aligned in parallel with one another and spaced apart from one another, and • an electrical unit, in particular a luminaire, according to any of claims 1 to 8, provided for connecting to the trunking rail (50).

13. Light trunking system according to claim 12, characterized in that busbars (60) are arranged on the two lateral walls (56) of the trunking rail profile (55).