Cable duct for receiving a conductor and assembly for connecting a conductor to a busbar system

Abstract

Cable duct (10) for receiving a conductor (16), with a holding device (14) which is designed to fasten the cable duct (10) to a busbar system (20) with a plurality of busbars (18) in such a way that the cable duct (10) covers at least one of the busbars (18) transversely to the longitudinal direction of the busbar (18), wherein the cable duct (10) has a length which is selected such that the cable duct (10), after being fastened to the busbar system (20), covers all busbars (18) of the busbar system (20) transversely to the longitudinal direction of the respective busbar (18), apart from a busbar (18) assigned to the conductor (16).

Description

The invention relates to a cable duct for receiving a conductor and to an assembly for connecting a conductor to a busbar system comprising a cable duct.Busbar systems serve for distributing electrical energy and usually comprise a plurality of electrically conductive busbars running parallel to one another. For feeding electrical energy into the busbar system, a respective conductor is connected to the busbars in a switchgear cabinet. The connection of the conductors to the respective busbar can be effected by means of connection terminals and / or feed adapters. The busbars themselves usually do not have any electrical insulation in order to simplify the connection.In particular in the case that connection terminals are to be used for the connection between the busbar and the conductor, the problem arises that the respective conductor can rest on further busbars of the busbar system to which the conductor is not connected, as a result of which sufficient contact protection is not ensured. In addition, undesired short circuits can occur in the event of damage to a conductor insulation.In order to improve the protection against contact, it is known to provide the busbars at least partially with insulating covers, as is described, for example, in EP 1 206 019 B1 and EP 2 863 496 B1. A disadvantage of these solutions is that the respective insulating cover must be cut to a suitable width in order to keep available the necessary installation space for further electrical components in the switchgear cabinet. This process is prone to errors and associated with high outlay and also waste material. In addition, the required cover elements are expensive to produce and have to be attached in separate working steps.Alternatively, the conductor can be guided around the busbars to which the conductor is not connected by an indirect cable guide in such a way that contact between the conductor and these busbars is avoided to the greatest possible extent. For example, the conductor can be routed along the rear side of the busbar system. Such an assembly, however, involves a great deal of work and cannot always be implemented in commercially available switch cabinets because of the limited space conditions.WO 2020 / 114579 A1 describes a busbar adapter which is composed of a lower cover element and an upper cover element. Electrical conductors are inserted in the lower cover element in order to electrically contact an electrical device which can be mounted on the upper cover element. Feet are provided on the bottom cover element for fastening to busbars, which also have contact devices with which the electrical conductors are electrically contacted with the busbars.EP 2 885 800 B1 discloses a busbar adapter which can be placed on busbars via fastening devices. The busbar adapter has openings for contacting connecting lines.The object of the invention is to be able to connect a conductor to a busbar system in a simple and reliable manner, while at the same time providing protection against contact. In particular, a particularly compact possibility for connecting the conductor is to be provided.The object is achieved according to the invention by a cable duct for receiving a conductor, having a holding device which is configured to fasten the cable duct to a busbar system having a plurality of busbars in such a way that the cable duct covers at least one of the busbars transversely with respect to the direction of longitudinal extent of the busbar. The cable duct has a length which is selected such that, after being fastened to the busbar system, the cable duct covers all the busbars of the busbar system transversely with respect to the direction of longitudinal extent of the respective busbar, with the exception of a busbar assigned to the conductor.The invention is based on the basic idea of avoiding contact between conductor and the busbars of the busbar system, to which the conductor is not intended to be connected, with the same component in which the conductor itself is also guided. In other words, the cable channel serves both for cable guidance and for providing a contact protection.Accordingly, the cable channel is manufactured in particular from an electrically insulating material, for example from a plastic.The cable duct also has a holding device, with which the cable duct can be fastened to the busbar system in a simple manner. In this way, it is particularly easy to mount the cable duct in a switchgear cabinet in which the busbar system is located, in order subsequently to attach the conductor.The term "conductor" here and in the following denotes an electrically conductive cable, which optionally has additional cable insulation and is supplied with electrical energy via an external current source.The expression "transversely to the direction of longitudinal extent" means, in particular, perpendicular to the direction of longitudinal extent.Because the cable duct covers all the busbars of the busbar system, apart from a busbar assigned to the conductor, particularly reliable protection against contact of the conductor with all the busbars of the busbar system to which the conductor is not intended to have an electrical connection is ensured.The conductor is preferably a neutral conductor. Neutral conductors are usually not connected via their own feed adapters to the busbar assigned to the neutral conductor in switch cabinets or junction boxes in which busbar systems are fed, in contrast to further conductors, for example phase conductors. Instead, the connection usually takes place via a connection terminal of simpler configuration compared to feed adapters, which connection terminal alone does not cover the further busbars of the busbar system in an electrically insulating manner. By using the cable duct according to the invention, touch protection between the neutral conductor and the further busbars of the busbar system is ensured in a simple manner and with little assembly effort.In principle, however, the conductor can also be any other conductor which is intended to be connected to one of the busbars of the busbar system for feeding in the respective busbar. For example, it is a phase conductor or a protective conductor.In order to achieve a particularly simple construction of the cable duct, the cable duct and the holding device can be embodied in one piece. In other words, the cable duct has in particular an integrated holding device. For example, the cable duct with an integrated holding device is an injection-molded plastic part.Preferably, the busbar associated with the conductor is one of the outermost busbars of the busbar system. For example, the busbar assigned to the conductor is the uppermost or the lowermost busbar of the busbar system, wherein the terms "uppermost" and "lowermost" refer to the installation arrangement of the busbar system in the switchgear cabinet.The cable duct can have an associated connection terminal, by means of which the conductor can be electrically connected to the busbar of the busbar system associated with the conductor.The associated connection terminal can be both a component separate from the cable duct, for example a connection terminal already attached to the busbar system in the switchgear cabinet, and a component of the cable duct.In one variant, the connection terminal and the cable channel are embodied in one piece. In other words, in this variant, it is an integrated connection terminal. In this way, the process of connecting the conductor to the busbar system is simplified to a particular extent, since the necessary connection terminal can be attached at the same time even when the cable duct is installed.In a further variant, the connection terminal is connected to the cable duct via a connecting element. In this way, a secure connection between cable channel and connection terminal can be achieved, while at the same time a flexible assembly process is made possible. For example, the connection terminal can first be fastened to the busbar assigned to the conductor, and then the cable duct can be attached to the busbar system by means of the holding device, wherein the connection between the connection terminal and the cable duct is established via the connecting element.In this variant, it is also possible for the same cable duct to be used with different types of connection terminals which only have to be connectable to the cable duct via the connecting element. In this way, the effort in storing the cable duct can be reduced and the material consumption can be reduced.The type of connecting element is not further limited as long as reliable fastening between the connection terminal and the cable channel is ensured. For example, the connecting element is a clip.In order to make particularly simple mounting of the cable duct on the busbar system possible, the holding device can have at least one latching means, by means of which the cable duct can be plugged onto at least one of the busbars.In other words, the latching means is intended to engage behind the respective busbar and in this way to secure the cable duct against movements. The latching connection between the holding device and the respective busbar can thus serve as a protection against an accidental removal of the cable duct from the busbar system.Naturally, the holding device can also have a plurality of latching means which interact in particular with different busbars of the busbar system.Preferably, the cable duct is fastened with the latching means or the latching means only on the outermost busbars covered by the cable duct. In this way, the structure and the assembly process of the cable duct are further simplified, while a reliable fixing to the busbar system is furthermore provided.The cable duct can have a fixing device for securing the conductor in the cable duct. In other words, the fixing device serves to prevent movements of the conductor within the cable duct or to prevent the conductor from unintentionally leaving the cable duct.The fixing device comprises, for example, a fastening bracket, a clamping section and / or a flap for closing the cable duct.The clamping section can have a V-shaped or U-shaped contour into which the conductor is pressed in the installation position.The object is furthermore achieved according to the invention by a module for connecting a conductor to a busbar system having a plurality of busbars, comprising a cable duct of the type explained above and at least one switching device which can be connected to at least one of the busbars via a switching device latching means, and wherein the holding device has a fastening means by means of which the cable duct can be fixed to the switching device.In this embodiment, the holding device ensures, in particular by way of an indirect fastening of the cable duct via the switching device, that the cable duct is fastened to the busbar system.However, it is understood that it is also possible that the holding device, in addition to being fastened to the switching device, additionally interacts directly with at least one of the busbars of the busbar system.The fastening means is, for example, a web or a connecting clip.Furthermore, the switching device can have a switching device housing which interacts with the fastening means of the holding device.For example, the cable duct is clipped to the switching device housing via the holding device.It is also possible for an adhesive to be used as the fastening means. In other words, the cable duct and the switching device can be connected to one another via an adhesive connection, in particular via an adhesive connection between cable duct and switching device housing.Furthermore, the cable duct and the switching device housing can be embodied in one piece. For example, the switching device housing and the cable duct form a common injection-molded part. In this case, the switching device housing itself constitutes the fastening means between the holding device and the switching device.The type of switching device is not further limited according to the invention as long as a reliable connection between the cable channel and the respective switching device is ensured.In particular, the switching device is a combined arrester or an overvoltage protection device.Further features and characteristics of the invention will become apparent from the following description of exemplary embodiments, which should not be understood in a limiting sense, and from the drawings. In these show:FIG. 1 is a perspective view of a first embodiment of a raceway according to the invention,FIG. 2 is a further perspective view of the cable duct of FIG. 1,FIG. 3 is a side view of the cable duct from FIG. 1,FIG. 4 is a front view of the cable duct from FIG. 1,FIG. 5 is a bottom view of the cable duct from FIG. 1,FIG. 6 shows selected parts of a second embodiment of the cable duct according to the invention in a representation analogous to FIG. 4,FIG. 7 is a bottom view of the cable duct from FIG. 6, analogous to FIG. 5,FIG. 8 shows a third embodiment of the cable duct according to the invention in a representation analogous to FIG. 4,FIG. 9 is a bottom view of the cable duct from FIG. 8, analogous to FIG. 5,FIG. 10 is a perspective view of a fourth embodiment of the cable duct according to the invention,FIG. 11 shows a perspective view of an assembly according to the invention for connecting a conductor to a busbar system having the cable duct from FIG. 10,FIG. 12 shows the assembly according to the invention from FIG. 11 after mounting on the busbar system, andFIG. 13 schematically shows further embodiments of the cable duct according to the invention in a representation analogous to FIG. 4.FIG. 1 shows a perspective view of a first embodiment of a cable duct 10 according to the invention.The receptacle 12 has two side walls 13 and serves to receive a conductor 16 between the side walls 13 (cf. FIGS. 5 to 7 ) which is intended to be connected to a busbar 18 of a busbar system 20. According to the invention, the conductor 16 is an electrically conductive cable.The busbar system 20 serves to distribute electrical energy within an electrical installation and represents the feed point into the electrical installation. For example, the busbar system 20 is arranged in a switch cabinet, not shown in more detail.The busbars 18 extend parallel to one another along a longitudinal extension direction L, wherein the distance between two adjacent busbars 18 is in each case the same. For example, the busbars 18 have a distance of 40 mm from one another.It is understood, however, that other, in particular larger, distances may also be present between the individual busbars 18. Likewise, the distances between adjacent busbars 18 within the busbar system 20 may also vary.The busbars 18 are made of an electrically conductive material such as copper or aluminum.The cable duct 10 runs transversely to the longitudinal extent direction L along a height direction H which is perpendicular to the longitudinal extent direction L.The raceway 10 has an overall length selected such that the raceway 10 covers the lower four busbars 18 along the height direction H in the installation position shown in FIG. 1. The uppermost busbar 18 is not covered by the cable duct 10 in the embodiment shown and is provided for being electrically contacted with the conductor 16 inserted into the receptacle 12. In other words, the uppermost busbar 18 in FIG. 1 is assigned to the conductor 16.The terms "upperst" and "lowerst" herein refer to the arrangement of the busbars 18 along the height direction H corresponding to the installation position of the busbars 18.It is understood that the cable duct 10 can also have a length differing from FIG. 1 as long as at least one busbar 18 is at least partially covered by the cable duct 10 (cf. FIG. 13 ). The length of the cable duct 10 is selected in particular according to which and how many of the busbars 18 are to be covered by the cable duct 10 and which of the busbars 18 the conductor 16 later inserted into the receptacle 12 is assigned to.As can be seen from the figures, the term "covered" denotes that the cable duct 10 only has to partially cover the respective busbar 18, namely at least in a width which is necessary in order to be able to accommodate the respective conductor 16.FIG. 2 shows a further perspective view of the cable duct 10, in which a rear side 22 of the cable duct 10 and the components of the holding device 14 attached to the rear side 22 can be seen better.The holding device 14 comprises a plurality of latching means 24, which serve to fasten the cable duct 10 directly to the busbars 18.In the embodiment shown, the holding device 14 has two latching means 24, wherein one of the latching means 24 interacts with the lowermost of the busbars 18 of the busbar system 20 and the other of the latching means 24 interacts with the uppermost of the busbars 18 covered by the cable duct 10, with the result that the latching means 24 are also referred to as lower latching means or upper latching means.The upper latching means 24 is designed as a latching nose, which partially surrounds the busbar 18. The cable channel 10 is thus supported on the busbar 18 via the latching lug under the action of gravity. At the same time, the latching lug prevents the cable duct 10 from being accidentally pulled off the busbar system 20 counter to a depth direction T which is perpendicular to the longitudinal extent direction L and to the height direction H.The lower latching means 24 is designed as a latching mechanism with a latching body 26 and a latching pin, which is rotatably mounted in the latching body 26 and has a latching end 28 and an actuating end 30.In the installation position of the cable duct 10, the latching end 28 is in contact with the lowermost busbar 18 of the busbar system 20 and, in addition to the upper latching means 24, secures the cable duct 10 against being pulled off counter to the depth direction T.As is indicated by the arrows in FIG. 3, the latching pin is designed such that the latching end 28 loses contact with the lowermost busbar 18 when the actuating end 30 is moved in the direction of the receptacle 12 of the cable duct 10.In other words, the latching pin can be transferred from a first position, which corresponds to the position shown in FIGS. 2 and 3, into a second position, in which the latching end 28 is displaced relative to the first position in the depth direction T.The movable latching pin results in a particularly simple mounting of the cable duct 10 on the busbar system 20.Thus, an engineer can initially hang the cable duct 10 with the latching nose of the upper latching means 24 on the busbar 18 assigned to the upper latching means 24.During or subsequently, the latching pin is transferred into the second position in that the assembler presses the actuating end 30 in the direction of the receptacle 12 and holds it in this position.By means of a rotational movement of the cable duct 10, at the end of which the rear side 22 of the cable duct 10 is in contact with all busbars 18 which are to be covered by the cable duct 10, the cable duct 10 is transferred into its installation position. The assembler then releases the actuating end 30, whereby the latching pin returns to the first position and clamps the lowermost busbar 18 between the rear side 22 and the latching end 28.Overall, the cable duct 10 is thus plugged onto the busbar system 20 in a particularly simple manner and at the same time secured against accidental removal counter to the depth direction T.FIGS. 4 and 5 show further views of the cable duct 10 according to the invention according to the first embodiment, wherein FIG. 5 schematically shows the conductor 16 inserted into the receptacle 12.FIG. 6 shows a top view of a second embodiment of the cable duct 10 according to the invention analogous to FIG. 4.The second embodiment corresponds substantially to the first embodiment, so that only differences will be discussed below. Identical reference symbols identify identical or functionally identical components, and reference is made to the above explanations.FIG. 6 also shows, in addition to the cable duct 10, the conductor 16 already inserted in the cable duct 10, which is additionally electrically connected via a connection terminal 32 to the uppermost busbar 18 of the busbar system 20.The conductor 16 is in particular a neutral conductor, so that the uppermost busbar 18 is the busbar 18 assigned to the neutral conductor. The further busbars 18 are assigned, for example, to the phase conductors (L 1, L 2 and L 3) or to a protective conductor.The connection terminal 32 has a fastening means 34, here a screw, by means of which the connection between the conductor 16 and the uppermost busbar 18 is established and the conductor 16 is secured against slipping parallel to the height direction H.Furthermore, the cable duct 10, namely the receptacle 12, has a fixing device 36.For this purpose, the fixing device 36 comprises a clamping section 38 and a flap 40, wherein the flap 40 is only shown in FIG. 7, but not in FIG. 6, in order to simplify the illustration in FIG. 6.The clamping section 38 is designed as a U-shaped profile which is inserted into the receptacle 12, in particular is connected to the receptacle 12 in a materially integral manner.It can be seen in FIG. 6 that the clamping section 38 extends over the entire length of the cable duct 10. Naturally, only one or more clamping sections 38 separate from one another may also be present, which are arranged distributed in the receptacle 12 along the height direction H.The clamping section 38 has a diameter which is selected such that the conductor 16 can be pressed into the clamping section 38 under the action of a force and is subsequently held by the clamping section 38.Naturally, the clamping section 38 can also be configured differently, for example have a V-shaped contour.In addition, the receptacle 12 is closed by the flap 40. The flap 40 is connected to the receptacle 12 via a hinge 42 so that the flap 40 is movably mounted, as is indicated by an arrow in FIG. 7. In this way, during the assembly of the conductor 16, the flap 40 can temporarily release the receptacle 12 and subsequently close it again.It is also conceivable for the flap 40 to be slid only onto the receptacle 12, for example via correspondingly shaped profiles on the side walls 13.FIGS. 8 and 9 show a third embodiment of the cable duct 10 according to the invention.The third embodiment corresponds substantially to the previous embodiments, so that only differences will be discussed below. Identical reference symbols identify identical or functionally identical components, and reference is made to the above explanations.In the third embodiment, the fixing device 36 likewise has a clamping section 38 with a U-shaped profile. However, no flap 40 is used.Instead, the fixing device 36 comprises a plurality of fixing brackets 44 which are placed on the clamping section 38 and additionally secure the conductor 16 against movements counter to the depth direction T.It is also possible for the fixing brackets 44 to be configured integrally with the clamping section 38.In addition, in this embodiment, the terminal 32 is connected to the duct 10 via a connecting member 45. The type of connecting element 45 is not further limited as long as a reliable connection is provided between the connection terminal 32 and the remaining cable channel 10. For example, the connecting element 45 can be a clip.FIG. 10 shows a perspective view of a fourth embodiment of the cable duct 10 according to the invention.The fourth embodiment corresponds substantially to the previous embodiments, so that only differences will be discussed below. Identical reference symbols identify identical or functionally identical components, and reference is made to the above explanations.In the fourth embodiment, the holding device 14 has fastening means 46 instead of the latching means 24.The fastening means 46 are designed as webs on the rear side 22 of the cable duct 10 and have a greater extent in the plane L-H than the receptacle 12.Between the fastening means 46, depressions 50 are formed on the rear side 22 of the cable duct 10 for receiving the busbars 18.The fastening means 46 each have an extension 52 and at least one projection 54 formed on the extension 52.The cable duct 10 according to the fourth embodiment is intended for use in an assembly 56 according to the invention for connecting the conductor 16 to the busbar system 20, as is shown in FIG. 11.The assembly 56 comprises the cable duct 10 as described above and a switching device 58.In the embodiment shown, the switching device 58 is a combined arrester, as is known, for example, under the designation "EXTENDhie ZP" from Fa. Extens SE is commercially available.Fundamentally, the switching device 58 can also be any other electrical component that is connected to the busbar system 20 and can be connected to the cable duct 10. For example, the switching device 58 may be an overvoltage protection device.As can be seen in FIG. 11, the switching device 58 has a plurality of fixing projections 62 on a switching device rear side 60.The fixing projections 62 are designed to be complementary to the fastening means 46 of the cable duct 10 in such a way that the cable duct 10 can be placed on the switching device rear side 60 counter to the depth direction T.In the installation position of the cable duct 10, the cable duct 10 is secured against movements parallel to the longitudinal extent direction L by means of the projections 54 and the fixing projections 62.In addition, the cable duct 10 rests with the side face 48 against the switching device 58.As can be seen in FIG. 11, in the installed position, the cable duct 10 extends along the depth direction T behind an additional module 64 of the switching device 58. the assembly 56 therefore has particularly compact overall dimensions, since only installation space which would already be occupied by the switching device 58 per se is used for the cable duct 10 along the length extension direction. Thus, no additional space needs to be provided in the switch cabinet for the attachment of the cable duct 10.In FIG. 12, the installation position of the assembly 56 on the busbar system 20 is shown. As can be seen, the cable duct 10 is plugged onto the respective busbars 18 together with the switching device 58.In particular, as shown in FIG. 11, the assembly can be plugged onto the busbar system 20 parallel to the depth direction T, whereby the busbars 18 are accommodated in the depressions 50 of the cable duct 10 and are each secured between two of the fixing projections 62.The switching device 58 also has switching device latching means 66, which are designed analogously to the lower latching means 24 as described above in connection with the cable duct 10.The switching device latching means 66 serve to fasten the assembly 56 to the busbar system 20.From the previous embodiments it is clear that in the embodiment of the assembly 56 shown, the cable duct 10 is fastened above all indirectly to the busbar system 20, namely via the switching device 58.Of course, it is also possible for the cable duct 10 to be additionally fastened directly to the busbar system 20, as described in the preceding embodiments, in order to enable an even more reliable fixing of the cable duct 10, if this is desired.As can be seen in FIG. 12, in the embodiment shown, the cable duct 10 covers all the busbars 18 of the busbar system 20 in the installation position, except for the lowermost of the busbars 18 along the height direction H. Accordingly, a connection terminal 32 can be attached to this busbar 18 as described above and a conductor 16, in particular a neutral conductor, can be electrically connected to the busbar 18 via the connection terminal 32.FIG. 13 shows a top view of further embodiments of the cable duct 10 according to the invention analogous to FIGS. 4, 6 and 8.The further embodiments substantially correspond to the preceding embodiments, so that only differences will be discussed below. Identical reference symbols identify identical or functionally identical components, and reference is made to the above explanations.FIG. 13 shows cable ducts 10 according to the invention, which have a different overall length, such that the respective cable ducts 10 cover a different number of busbars 18 along the height direction H.The cable duct 10 shown on the left in FIG. 13 corresponds to the embodiment already shown in FIGS. 1 to 5, which covers all busbars 18 except the uppermost busbar 18. The three embodiments shown to the right of this cable duct 10 have a shorter overall length and cover only the lower three, the lower two or only the lowermost busbar 18. Accordingly, these cable ducts 10 are intended to the effect that a conductor 16 is brought from below to the busbar system 20, is inserted into the respective receptacle 12 and is electrically connected to that busbar 18 which is the lowermost busbar 18 which is no longer covered by the respective cable duct 10. Thus, any of the busbars 18 may be fed via corresponding conductors 16, for example via phase conductors and protective conductors.The trunking 10 shown on the right in FIG. 13 has the same length as that of the trunking 10 shown on the left in FIG. 13, but is fastened to the busbar system 20 in such a way that all busbars 18 except the lowermost busbar 18 are covered by the trunking 10. Accordingly, in this case, the conductor 16 can be inserted into the receptacle 12 from above, i.e. counter to the height direction H, and can be fastened via the connection terminal 32 and to the lowermost of the busbars 18 and electrically connected thereto.Overall, the cable duct 10 according to the invention and the assembly 56 according to the invention are distinguished by a particularly simple structure, simple assembly and secure retention on the busbar system 20. The cable duct 10 moreover ensures excellent contact protection at all times between the conductor 16 and the busbars 18 to which the conductor 16 is not assigned.

Claims

Cable duct (10) for receiving a conductor (16), having a holding device (14) which is configured to fasten the cable duct (10) to a busbar system (20) having a plurality of busbars (18) in such a way that the cable duct (10) covers at least one of the busbars (18) transversely with respect to the direction of longitudinal extent of the busbar (18), wherein the cable duct (10) has a length which is selected in such a way that, after fastening to the busbar system (20), the cable duct (10) covers all the busbars (18) of the busbar system (20) transversely with respect to the direction of longitudinal extent of the respective busbar (18), apart from a busbar (18) assigned to the conductor (16).Cable duct (10) according to claim 1, wherein the cable duct (10) and the holding device (14) are configured in one piece.Cable duct (10) according to Claim 1 or 2, wherein the cable duct (10) has an associated connection terminal (32), by means of which the conductor (16) can be electrically connected to the busbar (18) of the busbar system (20) associated with the conductor (16).Cable duct (10) according to Claim 3, wherein the connection terminal (32) and the cable duct (10) are configured in one piece.Cable duct (10) according to Claim 3 or 4, wherein the connection terminal (32) is connected to the cable duct (10) via a connecting element.Cable duct (10) according to one of the preceding claims, wherein the holding device (14) has at least one latching means (24), by means of which the cable duct (10) can be plugged onto at least one of the busbars (18).Cable duct (10) according to one of the preceding claims, wherein the cable duct (10) has a fixing device (36) for securing the conductor (16) in the cable duct (10).Cable duct (10) according to claim 7, wherein the fixing device (36) comprises a fastening bracket (46), a clamping portion (38) and / or a flap (40) for closing the cable duct (10).Assembly (56) for connecting a conductor (16) to a busbar system (20) having a plurality of busbars (18), comprising a cable duct (10) according to one of the preceding claims and at least one switching device (58) which can be connected to at least one of the busbars (18) via a switching device latching means (66), and wherein the holding device (14) has a fastening means (46) by means of which the cable duct (10) can be fixed to the switching device (58).

Images