SE2150846A1 - A sealing module for a cable or pipe and transit systems comprising such a sealing module - Google Patents

Abstract

A sealing module (13) for a cable (11) or pipe, comprising two compressible module halves (16) facing each other, wherein each module half comprises an axially extending groove (18) with peelable sheets (17) cooperating with the groove (18) of the other module half to form an opening for receiving the cable or pipe. Each of the module halves (16) comprises an electrically conductive barrier (30) and exactly three axially aligned stacks (17a-c) of peelable sheets (17), wherein the electrically conductive barrier extends across the module half and is arranged between two of said stacks of peelable sheets. Disclosed is also transit systems comprising one or more such sealing modules.

Description

A SEALING MODULE FOR A CABLE OR PIPE AND TRANSIT SYSTEMS COMPRISING SUCH A SEALING MODULE Technical Field The present invention is related to a sealing module for a cable or a pipe. More specifically the present invention is related to a sealing module for a cable or pipe comprising two compressible module halves facing each other, Wherein each module half comprises an outer circumference and an axially extending groove cooperating With the groove of the other module half to forrn an opening for receiving the cable. Sealing modules of this type are generally used for sealing pipes and cables, such as cables provided With a cable shield and a cable jacket, going through a partition, such as a Wall, ceiling, floor, bulkhead, cabinet or other types of partitions. Sealing modules of this type comprise an electrically conductive barrier to protect against electromagnetic interference (EMI), such as radio-frequency interference (RFI), electromagnetic pulse (EMP), etc. The present invention is also related to transit systems comprising one or several of such sealing modules.

Background Electrically shielded cables, i.e. cables comprising a cable shield made of an electrically conductive material, have several applications. The purpose of the cable shield may be to maintain the quality of the signal conducted through the shielded cable, or to screen the surroundings from electromagnetic interference (EMI) caused by the signal conducted through the cable, or vice versa. Cables may also be provided With an arrnor, a metallic enclosure surrounding the cable. The shield serves its function continuously, preventing EMI from travelling into or out of the cable While the arrnor serves it purpose of preventing sudden failure, since it mechanically prevents the cable from being damaged, or prevents a more severe failure, since it is often used to bond the cable to ground (earth potential).

Such shielded and/or arrnored cables may be grounded as they pass a structure or is terrninated, e.g. for the purposes of bonding the cable With the surroundings or to prevent radio frequency interference (RFI) from passing through a shielded structure, such as a shielded wall, enclosure, bulkhead or similar partition.

There is a plurality of prior art solutions for protecting transits for cables or pipes against EMI in the prior art. One prior art solution is disclosed in WO20l2/034988, which discloses a sealing module comprising two compressible module halves divided into module sections, wherein an electrically conductive barrier is arranged between two module sections for protection against EMI, such as RFI, EMP, etc.

One problem with such prior art sealing modules is that they can be relatively difficult and time-consuming to install. In addition, according to various aspects, the reliability and sealing properties of such prior art sealing modules can be improved.

Summag In view of the above one object of the present invention is to provide an improved sealing module, which is easy to install and results in an efficient and reliable protection against EMI, such as RFI, EMP, etc.

The present invention is related to a sealing module for a cable or pipe, comprising two compressible module halves facing each other, wherein each module half comprises an axially extending groove with peelable sheets cooperating with the groove of the other module half to form an opening for receiving the cable or pipe, characterised in that each of the module halves comprises an electrically conductive barrier and exactly three axially aligned stacks of peelable sheets, wherein the electrically conductive barrier extends across the module half and is arranged between two of said stacks of peelable sheets. By the combination of three stacks of peelable sheets and the electrically conductive barrier between two of them a reliable protection is provided against EMI, such as RFI, EMP, etc., while providing efficient sealing properties and a sealing module that is easy to install and cost efficient to produce. The electrically conductive barrier can be arranged for contacting the pipe or a cable shield of the cable.

The electrically conductive barrier can extend across the groove and is partly removable to be adapted to an outer diameter of the cable shield or pipe. Hence, the groove can easily be adapted according to the cable and to the groove, such as the bigger groove after removal of different numbers of the peelable sheets from the different stacks, Wherein the electrically conductive barrier can press against the cable shield, optionally through a conductor, to ensure contact and sealing. The electrically conductive barrier can be elastically deforrnable.

The electrically conductive barrier can be flush With an outer surface of the module half, Wherein the electrically conductive barrier may be harder than the other sections of the module half, or can protrude from said outer surface to improve contact and sealing, e.g. if the electrically conductive barrier is softer than the other sections of the module half The sealing module can comprise the conductor, Wherein the conductor can be arranged in contact With the electrically conductive barrier and can extend from the groove to the outer surface for electrically contacting the cable or pipe received in the groove for grounding thereof While protecting against EMI, EMP, RFI, etc.

The sealing module can be arranged With a recess for receiving the conductor, Wherein favorable conducting and sealing properties can be combined.

The present invention is also related to a transit system comprising a frame, at least one sealing module according to any of the preceding claims arranged Within the frame, and a compression unit for compression of the sealing module Within the frame, Wherein the frame is of a conducting material and Wherein the electrically conductive barrier is arranged in electrical contact With the frame. The transit system can be adapted for use With a radially acting compression unit, such as a Wedge or similar. Altematively, the transit system can be in the form of a round seal for a single cable or a plurality of cables, Wherein the compression unit is adapted for axial compression.

Further objects and advantages of the present invention Will be clear to a person skilled in the art from the detailed description below and the dependent claims.

Brief Description of the DraWings Fig. 1 is a schematic perspective view of a transit system according to one example, Which transit system is arranged in a partition in the form of a Wall and provided With sealing modules, stayplates and a compression unit, Fig. 2 is a schematic perspective view of a conventional module half of a sealing module, illustrating the general concept of a groove and peelable sheets of the module half, Fig. 3 is a schematic perspective view of a part of the transit system of Fig. l according to one example, illustrating a conductor of a module half in contact with a cable shield of a cable arranged through the transit system, Fig. 4 is a schematic perspective view of the module half with the conductor in an unfolded position for allowing removal of peelable sheets and cutting or tearing of an electrically conductive barrier of the module half, Fig. 5 is a schematic perspective view of the module half according to Fig. 4, illustrating the conductor in a folded position in the groove and in contact with the partially cut or tom off electrically conductive barrier, Fig. 6 is a schematic perspective view of a transit system according to an altemative embodiment, Fig. 7 is a schematic perspective view of the module half with the electrically conductive barrier and the conductor in accordance with another embodiment of the present invention, illustrating the conductor according to one embodiment schematically in detail next to the electrically conductive barrier, Figs. 8-10 are schematic views of the module half in accordance with another embodiment without conductor, and Figs. ll-l3 are schematic views of the module half in accordance with Figs. 4 and 5 without the conductor.

Description of Embodiments To further describe the present invention a number of embodiments thereof will be described in detail below, referring to the appended drawings. The description of embodiments is directed towards cables, yet it should be noted that the present invention may also be used for pipes.

With reference to Fig. l, a transit system l0 for passing at least one cable ll and/or at least one pipe through a partition l2 is illustrated schematically according to one embodiment. The transit system l0 is arranged for passing one or more cables ll and/or pipes through a partition 12 in the form of a Wall, a floor, a roof or a ceiling. The partition 12 is illustrated by means of dashed lines in Fig. 1. For example, the transit system 10 is arranged for passing cables 11, such as cables for electricity, communication, computers etc., or pipes for different gases or liquids, such as Water, compressed air, hydraulic fluid, cooking gas or other types of liquids or gases. Cables and/or pipes are led in an axial direction through the transit system 10.

The transit system 10 according to Fig. 1 is arranged for receiving one or more sealing modules 13, a compression unit 14 and optionally stayplates 15. The sealing modules 13 may be arranged in different sizes and a plurality of different sealing modules 13 may be arranged in different configurations. For example, the compression unit 14 and the stayplates 15, if applicable, are of conventional type. For example, the compression unit 14 is a conventional wedge.

The sealing modules 13 are compressible. The sealing module 13 comprises two opposite and compressible module halves 16, Wherein each module half 16 has a groove 18 for receiving the cable 11 or pipe. Optionally, each module half 16 comprises a plurality of peelable sheets 17 placed in a semi-cylindrical groove 18 as illustrated in Fig. 2. For example, the peelable sheets 17 as such are of conventional type and are provided to adapt the diameter of the groove 18 to the outer diameter of the cable 11 or pipe. Optionally, a suitable number of peelable sheets 17 are removed to adapt the sealing module 16 to the diameter of the cable or pipe, Wherein the cable 11 or pipe is placed in the module half 16 and a sealing module 13 is formed by placing tWo module halves 16 on top of each other so that the grooves 18 are facing each other and form an opening for the cable 11 or pipe. The module half 16 also comprises an outer surface 19. The sealing modules 13 are resilient, and a suitable material may be natural or synthetic rubber, such as an EPDM rubber, optionally With additional fillers, but other altematives are possible, such as TPE.

In the embodiment of Fig, 1, the transit system 10 comprises a frame 20, Wherein the one or more sealing modules 13 are arranged Within the frame 20, optionally together With one or more stayplates 15 and the compression unit 14. For example, the frame 20 is of a conductive material, such as metal. For example, the frame 20 is of conventional type. A blind 21, such as a rubber or plastic core, may be arranged in the opening formed by the grooves 18 to provide sealing if a cable is not arranged therein. The blind 21 is removed prior to the arrangement of a cable therein. For example, the blind 21 is of conventional type.

With reference also to Fig. 3 a part of the transit system 10 is illustrated schematically, wherein a part has been taken away to illustrate the cable 11 arranged through a sealing module 13. As can be seen in Fig. 3, the sealing module 13 comprises a conductor 22, which will be described more in detail below. The conductor 22 is arranged to ground the cable 11 arranged in the groove 18. For example, a cable jacket lla is removed in a portion of the cable 11 to expose a cable shield 11b, wherein the cable shield 11b is arranged in contact with the conductor 22. The frame 20 is, e. g. of a conductive material, such as metal, wherein the conductor 22 is arranged in electric contact with the frame 20, either directly or via a stayplate 15 of conductive material or via conductors 22 of adjacent sealing modules 13 or via other electrical connection, for grounding the cable 11. For example, a current is diverted through the conductor 22 to the frame 20. For example, current, if any, is diverted through the conductor 22 via a stayplate 15 or an adj acent sealing module 13 with conductor 22 to the frame 20. The frame 20 will act as a collecting bar which in tum is connected to ground. It should be noted that not all sealing modules 13 in the frame 20 must be provided with the conductor 22. For example, in the transit system the current may travel along several routes to reach ground, and the intemal resistance for the system is low.

With reference to Figs. 4 and 5 a module half 16 of the sealing module 13 is illustrated according to one embodiment of the present invention, wherein the module half 16 comprises the peelable sheets 17, the groove 18, the outer surface 19, the conductor 22 and an electrically conductive barrier 23. The electrically conductive barrier 23 is provided for protection against EMI, such as RFI, EMP, etc. The electrically conductive barrier 23 is formed of an electrically conductive elastic material, such as electrically conductive rubber, silicone rubber, EPDM, TPE or similar material. Hence, the electrically conductive barrier 23 is compressible. For example, the module half 16 comprises three sections aligned in the axial direction, wherein the electrically conductive barrier 23 form one of said sections and is arranged between the other two sections of the module half 16. The other two sections is, e.g. arranged in the same material and are provided With peelable sheets 17. For example, the electrically conductive barrier 23 of one module half 16 is aligned With the electrically conductive barrier 23 of the other module half 16, to form a barrier across the sealing module 13. Hence, the electrically conductive barrier 23 is arranged in contact With the electrically conductive barrier 23 of the other module half 16. As can be seen in Fig. 4, the electrically conductive barrier 23 extends across the module half 16 and across the groove 18. Hence, the electrically conductive barrier 23 extends through the module half 16 in a direction orthogonal to the axial groove 18. Thus, the part of the electrically conductive barrier 23 extending across the groove 18 can be cut or tom off to be adapted to the cable 11.

The electrically conductive barrier 23 may be sandWiched or otherwise arranged in the module half 16. The electrically conductive barrier 23 protrudes through the peelable sheets 17, Which are divided into stacks of peelable sheets, Which Will be described more in detail below. In practice, the sections of the module half 16 corresponds to arranging a compressible body on both sides of the electrically conductive barrier 23, Wherein the groove 18 of each compressible body is aligned and Wherein peelable sheets 17 of material are arranged in each groove 18.

In Fig. 4, the conductor 22 is illustrated in an open unfolded position for illustration. HoWever, according to one embodiment, the conductor 22 is foldable to provide access to the peelable sheets 17 and the electrically conductive barrier 23 for removal of desired number of peelable sheets 17 and for removal of a part of the electrically conductive barrier 23 if needed. Hence, the conductor 22 can be unfolded as illustrated in Fig. 4, Wherein the electrically conductive barrier 23 and peelable sheets 17 are removed according to the cable 11 to be placed in the groove 18. Then, the conductor 22 can be placed in the groove 18 and in contact With the electrically conductive barrier 23 as illustrated in Fig. 5 for receiving a cable 11.

The conductor 22 extends from the groove 18 to the outer surface 19. For example, the conductor 22 extends in a cross direction of the module half 16 and the sealing module 13, such as from an approximate middle of the groove 18, to the outer surface 19, around the outer circumference of the module half 16, to the approximate middle of the groove 18, such that the first end of said length faces the second end and such that the conductor 22 connects an inside of the sealing module 13 (Which norrnally is not accessible during use) to an outside, Which may be accessible during use, or at least may be in contact With surrounding equipment, such as the frame 20, stayplate 15, a Wire or similar for grounding. For example, the conductor 22 is provided With a gap in the groove 18, e.g. to facilitate temporary removal of the conductor 22 for allowing peeling of sheets 17. Altematively, the conductor 22 extends around the entire circumference of the module half 16, optionally so that the ends thereof overlap. Hence, the conductor 22 extends at least from the groove 18 to be in contact With the cable 11 or pipe therein to the outer surface 19 of the module half 16 for further connection to ground, such that the conductor 22 electrically contacts the cable 11 or pipe received in the groove 18 and forms a conductive path to the outer surface 19.

The sealing module may be of parallelepiped shape (or block shape) or cylindrical shape, yet other shapes are foreseeable Within the scope of the present invention as defined by the claims. In various embodiments of the present invention, the sealing module 13 formed by the module halves 16 has a parallelepiped outer shape. HoWever, other shapes are foreseeable Within the scope of the present invention as defined by the claims. With reference to Fig. 6, the transit system 10 according to another embodiment is illustrated schematically, Wherein the sealing module 13 has a cylindrical outer shape and is formed of tWo semicylindrical or semiannular module halves 16 With peelable sheets 17. In the embodiment of Fig, 7, both of the module halves 16 are provided With a conductor 22. The sealing module 13 of Fig. 6 is similar to the sealing module 13 already described above With reference to Figs. 1-5, apart from the cylindrical shape and that it is compressible by a compression unit formed by front and rear fittings 24, 25 connected by screWs 26 for compressing the sealing module 13 in the axial direction. The transit system 10 of Fig. 6 is, e.g. positioned in a sleeve or in an opening in the partition 12. The transit system 10 of Fig. 6 is arranged for a single cable 11. HoWever, With a rectangular opening, one or more of the sealing modules 13 of parallelepiped shape as described in other embodiments can be received therein.

With reference to Fig. 7 the module half 16 With the electrically conductive barrier 23 and the conductor 22 is illustrated schematically according to one embodiment, Wherein the electrically conductive barrier 23 is illustrated intact and next to the conductor 22 for illustration purposes only. In practice, the electrically conductive barrier 23 is arranged under and in contact With the conductor 22 as described above and Would not be (clearly) visible. In Fig. 7 the module half 16 With the conductor 22 is illustrated schematically according to one embodiment of the invention, Wherein the conductor 22 is of metal and comprises a plurality of perforations 27 and conducting portions 28 surrounding the perforations 27. The perforations 27 and conducting portions 28 have been enlarged in the drawings for clarity purposes. Hence, in practice, the perforations 27 and conductive portions 28 can be much smaller. The conductor 22 is of metal. For example, the conductor 22 is a perforated sheet or foil of metal, such as copper or other suitable metal, including suitable conductive alloys. The perforations 27 are through openings substantially perpendicular to a plane of the sheet or foil of metal, Wherein the conducting portions 28 are the remaining material of the sheet or foil of metal after perforation thereof For example, the conductor 22 has a thickness of 0.1-1 mm or 0.1-0.5 mm.

The perforations 27 are, for example, arranged in a regular pattem, such as in roWs, Which may be in parallel and Which may be displaced in relation to each other. Hence, the conducting portions 28 are also arranged in a regular pattem. In the illustrated embodiment, the perforations 27 are elongated resulting in different electrical and mechanical properties depending on the direction of the perforations 27. The perforations 27 and conducting portions 28 are arranged to promote conductance of current in the direction of the conductor 22. For example, some or all of the perforations 27 are elongated and some or all of the elongated perforations are arranged in the same direction to promote conductance in that direction. In the embodiment of Fig. 7 the perforations 27 and conducting portions 28 are arranged to promote conductance of current in a direction perpendicular to the axial direction of the sealing module 13 and perpendicular to the groove 18. Hence, the elongated perforations 27 are arranged in the direction of the conductor 22, i.e. the longitudinal direction of the conductor 22 and in the direction current is to be conducted. The elongated perforations 27 have a longitudinal axis, Which extends in the longitudinal direction of the conductor 22 and from the groove 18 to the outer surface 19 of the module half 16. The configuration of the perforations 27 and the conducting portions 28 may be arranged to provide a larger conductive area in the longitudinal direction than in the transverse direction of the conductor 22. For example, the configuration of the perforations 27 and the conducting portions 28 is arranged to provide a shorter effective path for the current in the longitudinal direction than in the transverse direction of the conductor 22 to promote conductance in the longitudinal direction. The elongated perforations 27 is, for example, oval, triangular, rectangular or polygonal. For example, the elongated perforations 27 have an apex or two opposite apices pointing in the longitudinal direction of the conductor 22. In the embodiment of Fig. 7, the perforations 27 are hexagonal with an elongated shape having a longitudinal axis and two opposite apices arranged in the longitudinal direction of the conductor 22, and in the illustrated embodiment, perpendicular to the groove 18. The perforations 27 are, e.g. arranged with two opposite and parallel edges extending in the longitudinal direction of the conductor 22. Altematively, the perforations 27 are circular, square or arranged with another suitable shape.

According to the embodiment illustrated in Fig. 7 the perforations 27 are distributed to promote conductance in the longitudinal direction of the conductor 22. Hence, the perforations 27 are distributed to form conducting portions 28 having a more effective path in the longitudinal direction than in the transverse direction of the conductor 22, such as a straighter and more effective path in the longitudinal direction. For example, perforations 27 are displaced in relation to each other in the transverse direction of the conductor 22. In the illustrated embodiment, the perforations 27 are arranged in transverse rows, wherein the next row is displaced in the transverse direction. For example, the rows of perforations 27 are altematingly displaced. In addition, the rows of perforations 27 overlap each other, wherein the perforations 27 of one row extend into a position between perforations 27 of the adjacent row. For the elongated hexagonal perforations 27 the conductive portions 28 are arranged in a stretched honeycomb pattem. For example, the conductive portions 28 include longitudinal conductive portions and inclined conductive portions, wherein the longitudinal conductive portions extend in the longitudinal direction of the conductor 22 and are connected to each other through the inclined conductive portions. For example, the inclined conductive portions are arranged in an angle of 40 to 70 degrees in relation ll to the longitudinal conductive portions. For example, the longitudinal conductive portions are longer than the inclined conductive portions. Altematively, the perforations 27 are oval or parallelogram-shaped, such as elongated rhomboid, and arranged in a corresponding pattern. In the case of parallelogram-shaped perforations 27 there may be only inclined conductive portions, e.g. extending in an angle of 40 to 70 degrees in relation to the longitudinal direction of the conductor 22. For example, the conducting portions 28 cover 40 to 90 percent of the conductor 22 area, as seen in a plan view.

According to one embodiment, the perforations 27 are surrounded by a protruding edge (not illustrated). Hence, the conductive portions 28 are forrned With a protruding edge around the perforations 27, e. g. by means of the perforation process for forrning the perforations 27. The protruding edge extend substantially perpendicular to a plane of the conductor 22. For example, the protruding edges extend in a radial direction away from the module half 16 and may provide a plurality of effective contact points for engaging the cable 11. The protruding edge may have an uneven edge With a plurality of pointed tips or apices. It may be that the protruding edges partially extend into the cable 11.

With reference to Figs. 8-10, the module half 16 is illustrated according to one embodiment and Without the conductor 22. In the embodiment of Figs. 8-10, the electrically conductive barrier 23 extends through the module half 16 in a plane perpendicular to the axial groove 18 and form part of the outer surface 19 thereof For example, the outer periphery of the electrically conductive barrier 23 is flush With the outer surface of the adjacent sections of the module half 16. For example, the electrically conductive barrier 23 is rectangular and is arranged With a surface flush With a radially extending edge of the peelable sheets 17 and flush With the surface of the module half 16 facing the other module half, i.e. the upper surface of the module half 16 as illustrated in Figs. 8-10. Hence, a top surface of the electrically conductive barrier 23 is arranged flush With a top surface of the other sections of the module half 16, except for the groove 18. Side surfaces of the electrically conductive barrier 23 is, e.g., arranged flush With side surfaces of the other sections of the module half 16. A bottom surface of the electrically conductive barrier 23 is, e. g., arranged flush With a bottom surface of the other sections of the module half 16. For example, except for the groove 12 18, the electrically conductive barrier 23 may be arranged with the same outer dimensions as the other sections of the module half 16. In the embodiment of Figs. 8- 10, the material of the electrically conductive barrier 23 is, e. g., harder than the material of the other sections of the module half 16 and optionally also harder than the peelable sheets 17. For example, the material of the electrically conductive barrier 23 has a higher Shore A hardness value than the remaining sections of the sealing module 13.

The sealing module half 16 comprises exactly three axially aligned stacks 17a-c of peelable sheets 17, wherein the electrically conductive barrier 23 is arranged between two of said stacks 17a-c of peelable sheets 17. Hence, the diameter of the groove 18 is individually adaptable in three sections and on both sides of the electrically conductive barrier 23. The stacks 17a-c of peelable sheets 17 are distributed in the axial direction and aligned to form the groove 18 for the cable 11. Two of said stacks 17a-c are separated by the electrically conductive barrier 23. For example two of said stacks 17a-c are arranged in contact with the electrically conductive barrier 23 in the axial direction. Two of said stacks 17a-c are arranged axially adjacent each other in the illustrated embodiment but may be separated by another electrically conductive barrier or another section of the module half or by a gap.

With reference to Figs. 11-13 the module half 16 is illustrated according to another embodiment and without the conductor 22, wherein the module half 16 is formed with a recess 29 for partly or entirely receiving the conductor 22. The conductor 22 is arranged entirely within or at least partly within the recess 29. The depth of the recess 29 is, e.g. slightly less than the thickness of the conductor 22. Altematively, the depth of the recess 29 corresponds to the thickness of the conductor 22. The recess 29 may be machined or molded during manufacture of the module half 16. In the illustrated embodiments, the recess 29 is arranged in a midsection of the module half 16. Altematively, the recess 29 is arranged at an end section of the module half 16. The recess 29 extends along the circumference of the module half 16. For example, the recess 29 extends at least from the groove 18 to the outer surface 19 and/or at least along the outer surface 19 in a direction perpendicular to the groove 18. The recess 29 may also extend across the groove 18. In the embodiment of Figs. 11-13, the electrically conductive barrier 23 is arranged adj acent the recess 29. The outer dimension of the 13 electrically conductive barrier 23 is bigger than the recess and corresponds to the outer surface 19 of the module half 16 in other sections, such as the end sections of the module half. Altematively, the outer dimension of the electrically conductive barrier 23 is bigger than the outer surface 19 of the end sections of the module half 16, so that the electrically conductive barrier protrudes around the circumference of the module half 16 to be compressed in use. In the embodiment of Figs. 11-13, the material of the electrically conductive barrier 23 is, e. g., softer than the material of the other sections of the module half 16 and optionally also softer than the peelable sheets 17. For example, the material of the electrically conductive barrier 23 has a lower Shore A hardness Value than the remaining sections of the sealing module 13.

The module half according to Figs. 11-13 is provided With the peelable layers 17 arranged in the stacks l7a-c as described above. Hence, the peelable sheets 17 are arranged peelable in sections along the groove 18, Wherein each section comprises a stack of peelable sheets 17 With individually peelable sheets 17, so that the diameter of the groove 18 can be varied individually for each section. For example, the diameter of the groove 18 in a middle section can be adapted to a cable 11 With its cable jacket removed, Wherein first and second end sections can be adapted for a cable 11 having its jacket. Hence, the middle stack 17b of peelable sheets 17 can be arranged for receiving a cable 11 With smaller diameter than the end sections 17a, 17b. For example, each module half 16 comprises exactly three sections l7a-c of peelable sheets.

In use for a cable 11, an outer jacket of a shielded cable 11 is stripped in a small segment thereof such as to expose the cable shield (also called screen or arrnor) in that segment. The cable 11 is then arranged in the sealing module 13 such that the conductor 22 abuts the stripped segment, providing an adequate electrical connection. As the sealing module 13 is compressed the conductor 22 Will be forced towards the cable shield While the conductor 22 is forced against the electrically conductive barrier 23. The peelable sheets 17 are arranged in the individually peelable stacks l7a-c, Wherein an effective diameter of the groove 18 may be varied along the groove 18 according to the outer dimensions of the cable 11 including the stripped segment thereof. The peelable sheets 17 are arranged in three stacks l7a-c to form three sections in the axial direction, so that the diameter of the groove 18 can be adapted to the reduced diameter 14 where the outer jacket of the cable ll has been removed. The number of peelable sheets 17 to be removed may differ between the stacks 17a-c, such that the effective diameter of the groove 18 may be varied along the groove 18. Hence, the diameter of the groove 18 in each stack 17a-c of peelable sheets 17 is individually adjustable. Hence, electrical contact between the electrically conductive barrier 23 and the conductor 22 and between the cable 11 and the conductor 22 is improved. For example, the electrically conductive barrier 23 has a rectangular shape and extends into the groove 18, thus ensuring electrical contact to a cable or pipe arranged therein, e. g. by pressing the conductor 22 towards the cable shield. The amount of conductive material of the electrically conductive barrier 23 extending into the groove 18 may be reduced, e. g. by tearing or cutting in that portion of the material. The present invention provides a protection against EMI (Electromagnetic Interference), including EMP (Electromagnetic Pulse) and RFI (Radio Frequency Interference), and the sealing module 16 or transit system 10 as a whole will thus provide protection against many electrical failures (lightning, short- circuits etc.) and airbome interferences.

Claims (15)

1. 1. A sealing module (13) for a cable (1 1) or pipe, comprising two compressible module halves (16) facing each other, Wherein each module half comprises an axially extending groove (18) With peelable sheets (17) cooperating With the groove (18) of the other module half to form an opening for receiving the cable or pipe, characterised in that each of the module halves (16) comprises an electrically conductive barrier (3 0) and exactly three axially aligned stacks (l7a-c) of peelable sheets (17), Wherein the electrically conductive barrier extends across the module half and is arranged between two of said stacks of peelable sheets.

2. The sealing module of claim 1, Wherein the electrically conductive barrier extends across the groove and is partly removable to be adapted to an outer diameter of the cable (1 1) or pipe.

3. The sealing module according to any of the preceding claims, Wherein the electrically conductive barrier is elastically deforrnable.

4. The sealing module according to any of the preceding claims, Wherein the electrically conductive barrier is flush With an outer surface (19) of the module half or projects from said outer surface (19).

5. The sealing module of any of the preceding claims, comprising a conductor (22), arranged in contact With the electrically conductive barrier, Wherein the conductor (22) extends from the groove (18) to the outer surface (19) for electrically contacting the cable (1 1) or pipe received in the groove (18).

6. The sealing module of claim 5, Wherein the sealing module is arranged With a recess for receiving the conductor.

7. The sealing module of claim 6, Wherein the recess extends along the outer surface (19) of the module half (16) and in a radial direction perpendicular to the groove.

8. The sealing module of claim 7, Wherein the electrically conductive barrier is arranged adjacent the recess.

9. The sealing module of any of claims 5-8, Wherein the conductor (22) is arranged on top of a middle stack (l7b) of peelable sheets (17).

10. The sealing module of claim 9, Wherein the conductor (22) is flexible to allow removal of one or more of the peelable sheets (17).

11. The sealing module of any of claims 5-9, Wherein the conductor (22) is of metal and comprises a plurality of perforations (27) and conducting portions (28) surrounding the perforations (27).

12. The sealing module according to claim 11, Wherein the perforations (27) are elongated and are arranged in a longitudinal direction of the conductor (22) perpendicular to the groove (18).

13. The sealing module according to claim 11 or 12, Wherein the conductive portions (28) are formed With a protruding edge around the perforations (27), Wherein the protruding edges of some of the conductive portions (28) are arranged in contact With the electrically conductive barrier and/or the cable or pipe.

14. A transit system (10) comprising a frame (20), at least one sealing module (13) according to any of the preceding claims arranged Within the frame (20), and a compression unit (14, 24, 25, 26) for compression of the sealing module (13) Within the frame (20), Wherein the frame (20) is of a conducting material and Wherein the electrically conductive barrier is arranged in electrical contact With the frame.

15. The transit system of clain1 14, further coniprising a plurality of sealing niodules (13) and at least one stayplate (15) of a conducting material arranged between sealing niodules (13) and in contact With the frame (20), Wherein the stayplate (15) is arranged in electrical contact With the electrically conducting barrier.