Earth conductor penetration

Description

[0001] The present invention relates to an earth conductor bushing for installation in a wall or floor element.

[0002] A ground conductor bushing consists of a metallic ground conductor element that is installed in the wall or floor element and creates an electrical connection between its two sides. This electrical conductor, which then penetrates the wall or floor element, can be used, for example, for grounding, equipotential bonding, or for a lightning protection system.

[0003] DE 27 26 672 A1 relates to an earth conductor bushing consisting of a metallic earth conductor part and a plastic insulator part that encloses the earth conductor part. In one embodiment, which forms the basis of the present structure in the preamble and characterizing part, the earth conductor part is held in the insulator part in a rotationally secure manner by a locking pin, which is molded onto the earth conductor part.

[0004] EP 2 003 757 A1 also relates to an earth conductor bushing which is constructed from a metallic earth conductor and an insulating part enclosing it.

[0005] EP 2 899 332 A1 relates to a bushing with a pipe element for encasing in concrete, which, after encasing in concrete, keeps a passage opening free for the passage of a cable.

[0006] DE 102 17 979 B3 relates to a rod-shaped earth conductor for encasing in concrete, on which a seal is arranged on the outside.

[0007] From EP 3 159 901 A1 a rod bushing for electrical devices or transformers is known, with which a flat iron-shaped conductor piece is mounted in a housing wall via insulator parts and is additionally fixed axially with a locking pin.

[0008] The present invention is based on the technical problem of providing an advantageous earth conductor bushing.

[0009] This is achieved according to the invention with the bushing according to claim 1. This comprises an earth conductor and an insulator part, wherein the earth conductor part is arranged in a through-opening of the insulator part. The insulator part encloses the earth conductor radially outward (at least in an axial section); after installation, the insulator part is then in contact with the wall or floor element, i.e., typically the concrete. According to the invention, the bushing is further provided such that the earth conductor part is held in the through-opening of the insulator part via a positive fit, preventing it from twisting.

[0010] This can be advantageous, for example, if a cable or connector is mounted on the grounding conductor part after the bushing has been installed. To create such a connection, the grounding conductor part can be provided with an axial end, for example, which can be pre-assembled with an internal thread for screwing in a connector. Regardless of this specific design, screwing a connector or cable onto the grounding conductor part can be advantageous, for example, in that it allows for permanently reliable connections.

[0011] However, the inventors have discovered that screw connections can often result in relatively high torques. In the implementation according to the invention, the earth conductor part is therefore held in the insulator part by a form-fitting, twist-proof manner. After assembly, the insulator part is then in turn held in a form-fitting manner by the material of the wall or floor element, typically the hardened concrete. Compared to the earth conductor part, which can be in the shape of a rod and radially relatively compact, the insulator part extends radially further outwards, so that a correspondingly greater torque must be applied to break the connection to the concrete (simplified view to illustrate the principle). This allows the overall torque values ​​with which the earth conductor part can be handled without the risk of spinning.

[0012] Preferred embodiments can be found in the dependent claims and the entire disclosure, whereby the presentation of the features does not always distinguish in detail between device and method or use aspects; in any case, the disclosure is implicitly to be read with regard to all claim categories. For example, if the advantages of the ground conductor bushing are described in a specific application, this should be read as both a disclosure of a bushing designed for the corresponding application and a corresponding use.

[0013] The metallic earth conductor part can be made of, for example, structural steel such as St 37 or stainless steel, e.g., V2A or V4A, depending on the requirements profile. The earth conductor part is preferably designed so that, after installation, it extends as a continuous, uninterrupted part from one side of the wall or floor element to the opposite side (in general, it could also be composed of multiple parts). The earth conductor part can, for example, be rod-shaped, i.e., viewed in sectional planes perpendicular to the axial direction, have a round, particularly circular, cross-sectional profile, at least over the majority of its axial extent (a different cross-sectional profile is also possible in certain sections, e.g., to create a positive fit; see details below). An outer wall surface of the earth conductor part can be rubberized or otherwise coated, but this is only optional.

[0014] The insulator part is preferably made of a plastic material, e.g., a hard plastic. It could generally also be manufactured as a thermoformed part, but it is preferably an injection-molded part.

[0015] According to the invention, the insulator and ground conductor parts are assembled as previously manufactured separate parts. The insulator part is therefore, for example, injection-molded, and then it is assembled with the ground conductor part (i.e., the latter is inserted into the through-hole). While this assembly may increase the number of individual manufacturing steps compared to overmolding, it can, for example, open up modularity in that identical insulator parts can be combined with different ground conductor parts depending on the application. Injection molding can already be less complex than overmolding the insert, and different feedthroughs can also be constructed based on the same mold, for example, to suit different wall thicknesses (i.e., with ground conductor parts of different lengths).

[0016] The grounding conductor part assembled with the insulator part, however, is preferably sealed so that creepage paths for moisture along the outer wall surface of the grounding conductor part are extended or blocked. Generally, a separate seal, such as a sealing ring, could also be inserted into the through-hole of the insulator part for this purpose. The insulator part is preferably manufactured by multi-component injection molding, with a hard component forming the through-hole; the seal made of a soft component is injection-molded onto or within this. The latter can be, for example, a thermoplastic elastomer (TPE), while the hard component can be, for example, acrylonitrile butadiene styrene (ABS).

[0017] In the case of a multi-component injection-molded part, the hard and soft components together form the insulator part; however, a hard component can also form the insulator part on its own, as in a single-component injection-molded part. The hard component can, for example, have a Shore hardness (Shore D) of at least 40 Shore, 45 Shore, or 50 Shore, with possible upper limits of, for example, 100 Shore, 90 Shore, or 80 Shore. The soft component can, for example, have a Shore hardness (Shore A) of at most 70 Shore, 65 Shore, or 60 Shore, with possible lower limits of, for example, at least 40 Shore, 45 Shore, or 50 Shore.

[0018] Generally, the terms "axial," "radial," and "circumferential," as well as the corresponding directions, refer to a longitudinal axis of the earth conductor bushing. For example, the earth conductor section can extend along this axis from one side of the wall or floor element to the other. The earth conductor section can be at least rotationally symmetrical, preferably rotationally symmetrical, about the longitudinal axis (at least in an axial section; see the notes on the rod shape). The longitudinal axis of the bushing can, for example, pass through the center of the through-opening in the insulator section. An inner wall surface of the insulator section radially delimiting the through-opening can be at least rotationally symmetrical, preferably rotationally symmetrical, about the longitudinal axis. The anti-rotation device refers to the circumferential direction, thus blocking rotation in the circumferential direction.

[0019] According to the invention, a locking means combined with the insulator and ground conductor parts forms the positive connection. The insulator and ground conductor parts can also already be in positive contact with one another (relative to the direction of rotation), with the additional locking means then additionally preventing rotation. Preferably, the locking means alone provides the anti-rotation protection, so that the ground conductor part inserted into the insulator part can still be rotated in the through-opening as long as the locking means is not yet inserted. The locking means is pushed in a radial insertion direction into its positive contact, which blocks rotation between the ground conductor and insulator parts.

[0020] According to the invention, the positive locking element that secures the earth conductor part against rotation is formed on an outer wall surface of the earth conductor part. The outer wall surface of the earth conductor part, which is located on the outside with respect to the radial directions, is profiled (non-circular) in at least one axial section of the earth conductor part.

[0021] In the case of the locking device, the positive connection is then formed on a profile edge of the earth conductor part that is straight when viewed in section (the cutting plane is, for example, perpendicular to the longitudinal axis). The locking device can then be slid on, for example, with a straight-line movement parallel to this edge, which can be advantageous, for example, with regard to assembly effort. Viewed in section, the outer wall surface of the earth conductor part forms a straight line over a circumferential section, where the locking device rests, preferably with a flat contact surface that is also linear in section. Preferably, the locking device also has a flat contact surface on the insulator part; more preferably, this contact surface lies in a common plane with the contact surface on the earth conductor part. Viewed in section, the contact surfaces therefore lie on a common straight line.

[0022] In a preferred embodiment, the locking means is provided in a clamp-like manner, i.e., it rests against two radially opposite outer wall surface sections of the grounding conductor part. These outer wall surface sections are preferably individually flat, and particularly preferably, they are parallel to one another. Viewed in section, the outer wall surface sections can thus form two straight, parallel edges. The clamp-like locking means is then attached to the grounding conductor part like an open-end wrench and blocks rotation relative to the insulator part.

[0023] According to a preferred embodiment, a seal is provided axially on each side of the locking means, sealing the ground conductor against the insulator part. These seals are preferably molded as a soft component in a multi-component injection molding process, see above.

[0024] A preferred ground conductor bushing has a rib seal on the radial outside, which is enclosed by the potting material of the wall element when the bushing is cast in. The rib seal is preferably made of a material that is softer than the insulator part; particularly preferably, it is injection-molded as a soft component in a multi-component injection molding process (preferably together with the seal(s) mentioned above). The rib seal has a circumferential rib that rises radially outward. This rib is then enclosed axially and radially outward by the potting material.

[0025] The soft material of the web seal can establish good contact with the potting material and maintain it when the latter shrinks during curing. Preferably, one or more end faces of the web, viewed in an axial section, are formed with one or more axially projecting projections; preferably, there are several such projections at different radial positions. These then form an undercut with the solidified potting material in the radial direction, so that the web seal is reliably held in the potting material. As already mentioned, these variants are also expressly intended to be disclosed with regard to a corresponding use in which the feedthrough is installed and the potting material encloses the web seal.

[0026] According to a preferred embodiment, which is also intended to be expressly disclosed with regard to its use, the insulator part has a blocking section, which is surrounded by the potting material in such a way that the insulator part is held therein in a rotationally secure manner. The blocking section is preferably provided on a flange of the insulator part, i.e., it is positioned radially further outward (advantageous with regard to torque, see above). The blocking section arranged on the flange preferably protrudes axially, for example, in the form of a pin; preferably, there are several pins distributed circumferentially.

[0027] In general, the flange is preferably provided axially at the end of the earth conductor part so that it can be used for mounting the feedthrough on a formwork element. The blocking section preferably rises in an axial direction that points away from the earth conductor part, i.e. it rises axially towards the formwork. The blocking section or tenon is preferably used during mounting on the formwork, namely a fastening element, e.g. a screw or a nail, is inserted into the formwork through the blocking section / tenon from the rear side facing away from the formwork. For this purpose, the blocking section / tenon can preferably be prefabricated in such a way that it is provided with a hole, in particular a blind hole, on this rear side. The fastening element can be inserted into this hole and then inserted into the formwork.

[0028] The front side of the flange facing away from the ground conductor section, i.e. facing the formwork, can be provided with a step when viewed in an axial section. In this variant, there is preferably a flange surface radially inward, which is pressed against the formwork (indirectly or directly, see below). Set back with the step, a radially outer edge (edge ​​section) is provided, which can preferably be completely circumferential. The blocking section / pin can then also be arranged there; this can therefore protrude axially relative to the edge section, with its free end then being able to lie essentially in a plane with the flange surface. Preferably, the edge section is not bordered radially outwards, so that the potting material covers it axially. Independent of these details, the axially set-back edge section can, for example, also simplify optional assembly with another flange body, see below for details.

[0029] According to a preferred embodiment, when the flange is positioned on a formwork for installing the feedthrough, an elastic material, preferably a foam material, e.g., sponge rubber, is or will be arranged on the flange surface. The elastic material can, for example, be applied separately to the flange surface, but it can also be injection-molded as a soft component. Particularly in the latter variant, individual points or webs, e.g., circumferential rings, can be formed from the elastic material; however, this material can also cover the flange surface in the form of a layer. The elastic material can, for example, improve the contact of the flange with the formwork; due to its spring effect, it can also allow a certain amount of force to be applied (a firm press).

[0030] According to a preferred embodiment, the flange of the insulator part is or is assembled with a flange body that projects radially outward beyond the flange. The flange body forms a flange body surface facing away from the ground conductor part or towards the formwork, radially outside the flange surface of the insulator part. The flange body surface is preferably provided to be completely circumferential, i.e., continuously and uninterrupted in the circumferential direction. The flange body surface can, for example, have a radial extension of at least 2 cm away from the flange surface of the insulator part, which preferably applies completely circumferentially, i.e., in every radial direction.

[0031] InIn a respective radial direction, the flange body can protrude outwards beyond the flange by at least 2 cm, 3 cm, 4 cm or 5 cm, for example; possible upper limits can be, for example, a maximum of 40 cm, 30 cm or 20 cm. A corresponding projection, which can, for example, enable good application of a surface seal, is preferably achieved in every radial direction. The part of the flange body that protrudes radially outwards relative to the flange, i.e. the flange body surface, is preferably continuous all the way around. The application of the surface seal can, for example, be by painting on a sealing coating or gluing on a sealing film or the like.In general, the embodiments relating to the flange body assembled with the flange of the insulator part may also be of interest independently of the positive-locking anti-rotation lock between the ground conductor and insulator parts according to the main claim, and they should accordingly be disclosed independently thereof. The described enlargement of the flange by attaching the flange body may therefore generally be of interest in connection with a ground conductor bushing comprising a ground conductor and an insulator part (the ground conductor part is preferably arranged in a through-opening of the insulator part). Despite the disclosure being independent of the positive-locking anti-rotation lock, combinations with other specific embodiments may well be of interest.

[0032] The flange of the insulator part is preferably provided with an axially recessed edge section on its front side (see above), on which the flange body then preferably sits. The flange surface of the insulator part and the flange body surface can thus lie essentially in a common plane. Independently of this, positioning on the edge section can, for example, create stability. The flange body can be supported on the one hand on the outer circumference of the edge section and on the other hand on the stepped shape formed between the inner flange surface and the edge section, which creates stability and can, for example, prevent tipping. In general, the flange and the flange body can preferably be sealed against one another, particularly preferably with a seal arranged on the outer circumference of the edge section. This seal can be attached or, preferably, injection-molded.The seal, i.e. the elastic material, can also create stability there, namely promote a non-slip fit between the flange and the flange body.

[0033] Preferably, the flange body and the insulator part, in particular its flange, are also held together in an axially positive-locking manner in the assembled state. Preferably, a locking means is provided which, in the assembled state, forms a positive connection with respect to one axial direction (in the other axial direction, there is preferably a contact surface, preferably at the edge section). The locking means is preferably provided on the flange body and, in the assembled state, engages behind the edge section of the flange, thus resting against its rear side (which faces the ground conductor and away from the formwork).

[0034] According to a preferred embodiment, the flange body is provided with a form-locking element, via which it can be assembled with another flange body in a form-fitting manner, so that several earth conductor bushings can be assembled in a modular manner. Viewed axially, the assembled flange bodies are arranged next to one another; preferably, there are several form-locking elements, and row- and column-shaped assembly is possible (i.e., viewed axially, the flange bodies can be placed next to one another and one on top of the other). The form-locking flange bodies or bushings are held together radially via the form-locking; this can, for example, simplify positioning or mounting on the formwork.

[0035] From an axial perspective, the flange body preferably has an outer shape with multiple corners and edges (i.e., it is not round), e.g., a square, hexagonal, or octagonal shape. The flange bodies are then preferably assembled in such a way that they each abut one side edge of this polygonal shape (from an axial perspective).

[0036] As already mentioned several times, the invention also relates to the use of a presently disclosed earth conductor bushing, or a module comprising several assembled bushings, for installation in a wall or floor element, preferably in a wall. Installation is preferably carried out by pouring with an initially flowable and then solidifying casting material, preferably concrete. The earth conductor bushing can be fastened to a formwork, in particular in the manner described above, which is then filled with concrete. The formwork can then be removed again so that the concreted-in earth conductor part is accessible from both sides of the wall. A cable or a connecting piece is then preferably fastened, in particular screwed, to the earth conductor part; see also the comments at the beginning.

[0037] Also disclosed is a method for producing a ground conductor bushing, wherein the insulator part is formed by injection molding. Express reference is also made to the above information on preferred manufacturing details (multi-component injection molding, etc.). Preferably, the insulator part is assembled with the ground conductor part after injection molding (i.e., the latter is not overmolded as an insert). Preferably, after the insulator and ground conductor parts have been assembled, the locking means is inserted to create the positive connection; particularly preferably, it is inserted radially.

[0038] Preferably, the locking means can be manufactured together with the insulator part in the same injection molding process. Particularly preferably, the locking means can then be integrally formed with the insulator part, meaning it cannot be separated from it without causing damage. The two can, for example, be molded from the same component, with the locking means then being separated, which can be facilitated, for example, by a material bridge of reduced thickness between them. It can then be turned off, for example. In the case of multi-component injection molding, the two can also be connected to one another via a connecting piece formed from the soft component. The locking means then sometimes does not even have to be separated for form-fitting insertion; it hangs via the connecting piece made from the soft component, virtually captively attached to the insulator part.

[0039] In general, the locking element and the insulator part can also be designed or molded from different hard components, for example, the locking element from a harder material (with a higher Shore hardness). The locking element can be cast from PA 6 GF, for example, and the insulator part from ABS. Given the preferred one-piece manufacturing process, three-component injection molding is also possible, namely in combination with a soft component (TPE), from which, among other things, the connecting piece can be formed. Short description of the drawings

[0040] In the following, the invention is explained in more detail using an exemplary embodiment, whereby the individual features within the scope of the independent claims can also be essential to the invention in other combinations and no distinction is made in detail between the different claim categories.

[0041] In detail, Figure 1 shows an earth conductor bushing according to the invention in the installed state in an axial section; Figure 2 shows the insulator part of the bushing according to Figure 1 in a view from the front; Figure 3 the combination of earth conductor part and locking means of the bushing according to Figure 1 in an oblique view from the front; Figure 4 shows a section through the earth conductor and insulator parts, which are held against rotation by the locking means; Figure 5 shows a flange body assembled with the flange of the insulator part in an oblique view from the front; Figure 6 shows the flange body according to Figure 5 in an oblique view from behind; Figure 7 the insulator part with hard and soft components in an axial section; Figure 8 the soft component according to Figure 7 in a single representation. Preferred embodiment of the invention

[0042] Figure 1shows an axial section of an earth conductor bushing 1 cast into a wall element 2. The earth conductor bushing 1 has an earth conductor part 3, in this case a steel rod, and an insulator part 4. The insulator part 4 is a plastic injection-molded part, and axially opposite, another identical insulator part is placed on the earth conductor part 3 (however, for the sake of simplicity, reference is made below only to an insulator part).

[0043] The insulator part 4 has a flange 5, which forms a flange surface 5.1.1 facing away from the earth conductor part 3 in a radially inner section 5.1. With this flange surface 5.1.1, the earth conductor bushing 1 rests against a formwork element during casting, which in the situation according to Figure 1has already been removed. A foam material, such as foam rubber, can be placed on the flange surface 5.1.1 to improve the contact with the formwork, see the introduction to the description. An edge section 5.2 of the flange 5 is in the situation according to Figure 1 enclosed by the concrete and forms a torsion lock (for further functions, please refer to the Figure 5 and 6 referred to).

[0044] Figure 2 shows the insulator part 4 in a single view, in an oblique view from the front. The view is directed towards the flange surface 5.1.1, and the axially recessed edge section 5.2 is also visible. Blocking sections 20 are arranged there, namely axially protruding pins 5.2.1. These are enclosed by the concrete when installed (situation according to Figure 1), which prevents rotation. The tenons 5.2.1 also serve to mount the bushing 1 on the formwork; from the rear side, a hole 40 extends into each tenon 5.2.1, cf. Figure 4 . Through these holes 40, for example, a screw can be inserted and the insulator part 4 and thus the bushing 1 can be screwed to the formwork. (In the view according to Figure 4 the screws would be screwed into the drawing plane, in the view according to Figure 2 they then emerge from the free ends of the pins 5.2.1.)

[0045] As from Figure 2 As can be seen, the insulator part 4 forms a through opening 25 into which the earth conductor part 3 is inserted. Figure 3shows the earth conductor part 3 together with a locking means 30, namely a clamp. The earth conductor part 3 is inserted into the through-hole 25 without the locking means 30, after which the locking means 30 is pushed on, thus creating an anti-twist device between the insulator part 4 and the earth conductor part 3. As can be seen from the Figure 3 and 4 As can be seen, an outer wall surface 3.1 of the earth conductor part 3 is designed to be flat in outer wall surface sections 3.1.1-3.1.4. Functionally, the outer wall surface sections 3.1.1 and 3.1.2 belong together; they provide an anti-twist device for the presently discussed and in Figure 4 shown insulator part 4 (the outer wall surface sections 3.1.3 and 3.1.4 concerning the axially opposite insulator part).

[0046] Figure 4shows the insulator part 4, the earth conductor part 3 and the locking means 30, wherein the earth conductor part 3 is inserted into the through-hole 25 and the locking means 30 is pushed on. This forms a positive connection 45, which holds the earth conductor and insulator parts 3, 4 against rotation, i.e. with respect to a rotation 11 around the longitudinal axis 10 (compare Figure 1 ). This means that if connecting pieces (not shown) are screwed into the end recesses 12 of the earth conductor part 3, comparatively large torques can be applied without the earth conductor part 3 becoming hollow. Figure 4 shows a section, the cutting plane is perpendicular to the longitudinal axis 10.

[0047] Figure 5shows a variant in which an additional flange body 50 is attached to the flange 5 of the insulator part 4. The flange body 50 projects outward beyond the flange surface 5.1.1 in the radial directions 51 (shown as an example for one radial direction 51). From the flange surface 5.1.1, it has a radial extension 52 of approximately 10 cm, circumferentially, i.e., in every radial direction. This variant thus allows for a surface seal to be easily applied to the penetration 1, which is applied to a side surface of the wall element 2, e.g., a bitumen coating.

[0048] The flange body 50 further comprises form-locking elements 55, via which it can be assembled in a form-locking manner with the flange body 50 of another bushing 1. The form-locking elements 55 engage in openings 56 of the other, identically constructed flange body 50. Analogous to flange 5, the flange body 50 is also provided with blocking sections 57, which are enclosed by the concrete, thus creating an anti-twist protection.

[0049] Figure 6shows the flange body 50 in a rear view, which reveals openings 60 arranged in the pin-shaped blocking sections 57. Analogous to the above description, the blocking sections 57 can also be used to fasten the flange body 50 and thus the bushing 1 to the formwork. In addition to the form-locking elements 55 and the opening 56, an annular space 61 formed by the flange body 50 can also be seen in the rear view. The edge section 5.2 of the flange 5 is placed on or in these, and the flange 5 is then held axially via locking means 62. Webs 63 are provided in the annular space 61, which, together with the blocking sections 20 or pins 5.2.1 of the flange 5, create an anti-twist device (between the insulator part 4 and the flange body 50).

[0050] Figure 7 shows a part of the insulator part 50 in an axial section, in addition, Figure 8which shows only the soft component. The soft component 80 forms a circumferential seal 81 on the outer wall of the edge section 5.2, which, when assembled, rests against the wall surface 50.1 of the flange body 50 (see Figure 6 ). Furthermore, the soft component 80 forms two circumferential seals 82, which in the assembled state are arranged axially on both sides of the locking means 30, for example in the illustration according to Figure 3 in front of and behind the locking device 30. This blocks creepage paths along the outer wall surface 3.1 of the earth conductor part 3.

[0051] A web seal 83 is also formed from the soft component 80, which in this case has a web 84. This rises radially outwards and circumferentially; in the installed state, it is enclosed by the concrete, see Figure 1This extends or blocks the creepage paths for moisture along the interface between concrete and penetration 1. Figure 1 A sleeve could be arranged below the web seal 84, i.e. pushed onto the earth conductor part 3; however, this is only optional.

Claims

1. Ground conductor bushing (1) for installation in a wall or floor element (2), comprising a metallic ground conductor part (3), an insulator part (4) and a locking means (30) which is assembled with the insulator part (4) and the ground conductor part (3), wherein the insulator part (4) forms a passage opening (25) in which the ground conductor part (3) is arranged, wherein the ground conductor part (3) is held in the passage opening (25) of the insulator part (4) in a manner secured against rotation in relation to a revolution about a longitudinal axis (10) of the ground conductor bushing via a form fit (45), wherein the insulator part (4) and the ground conductor part (3) are assembled as separately produced parts beforehand in each case, and wherein the locking means (30) is pushed with a radial insertion direction, in relation to the longitudinal axis (10) of the ground conductor bushing (1), into an abutment blocking the rotation between the ground conductor part (3) and the insulator part (4) and forms the form fit (45), characterized in that the form fit (45) holding the ground conductor part (3) in a manner secured against rotation is formed on an outer wall surface (3.1) of the ground conductor part (3), and in that the outer wall surface (3.1) of the ground conductor part (3) has, in the region of the form fit (45), a profile which, as viewed in a section perpendicular to the axis, forms a straight edge against which the locking means (30) bears.

2. Ground conductor bushing (1) according to Claim 1, in which the insulator part (4) is a multi-component injection-moulded part, in which a hard component forms the passage opening (25) in which the ground conductor part (3) is arranged, and a soft component (80) forms a seal (82) which is arranged on or in the passage opening (25) and which seals against the ground conductor part (3).

3. Ground conductor bushing (1) according to one of the preceding claims, in which the locking means (30) engages around the ground conductor part (3) in the manner of a clamp, that is to say bears against two wall surface sections (3.1.1, 3.1.2) of the ground conductor part (3) which are radially opposite one another in relation to a longitudinal axis (10) of the ground conductor bushing (1).

4. Ground conductor bushing (1) according to one of the preceding claims, in which, in relation to a longitudinal axis (10) of the ground conductor bushing (1), a respective seal (82) is provided axially on both sides of the locking means (30) and seals the ground conductor part (3) against the insulator part (4), and / or which has a web seal (83) against which a grouting material bears when the ground conductor bushing (1) is cast in.

5. Ground conductor bushing (1) according to one of the preceding claims, in which the insulator part (4) has a blocking section (20) which is surrounded by a grouting material when the ground conductor bushing (1) is cast in and holds the insulator part (4) in a manner secured against rotation in the grouting material, wherein the blocking section (20, 5.2.1) is preferably formed on a flange (5) of the insulator part and projects axially in relation to a longitudinal axis (10) of the ground conductor bushing (1).

6. Ground conductor bushing (1) according to one of the preceding claims, in which the insulator part (4), in relation to a longitudinal axis (10) of the ground conductor bushing (1), has a flange (5) with a flange surface (5.1.1) on the axial end side, which flange surface points away from the ground conductor part (3) in an axial direction, wherein an elastic material, preferably a foam material, is arranged on the flange surface (5.1.1).

7. Ground conductor bushing (1) according to one of the preceding claims, in which, in each case in relation to a longitudinal axis (10) of the ground conductor bushing (1), the insulator part (4) has a flange (5) on the axial end side, wherein a flange body (50) which projects radially outwards beyond the flange (5) is attached to the flange (5).

8. Ground conductor bushing (1) according to Claim 7, in which the flange body (50) has a flange body flange surface (50.1.1) which points away from the ground conductor part (3) in an axial direction, wherein the flange body flange surface (50.2), taken radially away from a flange surface of the insulator part (4), has an extent of at least 2 cm.

9. Ground conductor bushing (1) according to Claim 7 or 8, in which the flange body (50) and the insulator part (4) are held together in an axially form-fitting manner by a latching element (62), which latching element (62) is integrally formed on the flange body (50) or on the insulator part (4).

10. Ground conductor bushing (1) according to one of Claims 6 to 9, in which the flange body (50) has, radially on the outer side, a form-fitting element (55) via which the ground conductor bushing (1) can be assembled in a form-fitting manner with a further flange body (50).

11. Use of a ground conductor bushing (1) according to one of the preceding claims for installation in a wall or floor element (2) and for connecting a line to the ground conductor part (3).