FR3067864A1 - GROUNDING DRIVER ELEMENT - Google Patents

Abstract

Conductor element (6) for grounding a screen (11) of an electric cable (10), the electric cable (10) having a neutral conductor (13), phase conductors (14a-c ), a conductive screen (11) surrounding the conductors (13, 14a-c) and in electrical contact with the neutral conductor (13), and a sheath (12) surrounding the screen (11), a unsheathed portion (15) , 16) of the electrical cable (10) being mounted, in the mounted position, in a junction box (40) intended to be buried in the ground, the element (6) having a longitudinal direction (L), a transverse direction (T), and a vertical direction (V) and, with respect to said vertical direction, a lower face intended to come into contact with the cable (10), and an opposite upper face, the element (6) comprising successively: a first end portion (60) provided with first connection means (601) configured to allow connection to the neutral wave (13), inside the box (40); - a contact portion (61) configured to be placed against the screen (11) of the cable (10) and in electrical contact therewith, within the box (40); - a holding portion (64) configured to be held against the outer face of the cable (10), outside the box (40); a second end portion (65) provided with second connection means (651) configured to allow connection to a grounded conductive member outside the box (40); the element (6) further comprising, between the contact portion (61) and the holding portion (64): - a sealing portion (63) having a lower face which is offset from the underside of the the contact portion (61), in the vertical direction (V) and upwards, of an offset (d), so that in the mounted position there is a space (e) between the outer face of the cable ( 10) and the underside of the sealing part (63), the sealing part (63) being intended to be disposed between the inside and the outside of the box (40).

Description

EARTHING CONDUCTING ELEMENT

The present invention relates to the technical field of the connection of at least two low voltage electric cables within a low voltage underground box and its earthing. More particularly the invention relates to a conductive element capable of connecting a neutral conductor, located inside a box, to the earth located outside of said box, the passage from the inside to the outside being carried out. tightly, particularly to water infiltration.

It is known to use a low-voltage underground box to protect a junction (connection between two cable ends) or a shunt (connection between at least three cable ends). Such a box includes connectors making the connections between the various conductors of the cables and an insulating envelope surrounding the entire connection area. A resin is preferably poured into said envelope.

It is desired to connect one of the potentials of the cables, typically that carried by a neutral conductor, on the one hand to a screen present on the cables, and on the other hand to earth. This supposes an electrical connection between said neutral conductor and said screen, located inside the box, and the earth located outside the box. This connection, requiring a certain flexibility, is conventionally carried out by means of a flexible braid. This flexible braid is connected at one end to the neutral conductor, inside the box, and crosses the envelope of the box so that its other end meets the earth, located outside the box. The braid passes through the envelope conventionally along one of the cables.

The use of such a braid leads to several drawbacks. A first drawback is linked to the irregular surface state inherent in braiding. This irregularity makes it difficult to achieve a seal between the braid and the cable and between the braid and the envelope, both the cable and the envelope having on the contrary a smooth surface. A second drawback is that the braid promotes, by capillary action, a transport of harmful water.

It is known, in order to overcome these drawbacks, to “massify” the braid by soaking its section by tinning with solder, at the interface between the braid and the envelope. After hardening of the weld, the braid has better resistance to capillarity. However, its surface condition remains little different and the first drawback persists.

The present invention aims to remedy the drawbacks mentioned above, by providing a conductive element for earthing allowing a crossing of a can envelope in a sealed manner.

To this end, the invention relates to a conductive element for earthing a screen of an electric cable, the electric cable comprising a neutral conductor, phase conductors, a conductive screen surrounding the conductors and in contact. electric with the neutral conductor, and a sheath surrounding the screen, a stripped portion of the electric cable being housed, in the mounted position, in a junction or junction box intended to be buried in the ground, the element having a direction longitudinal, a transverse direction, and a vertical direction and, with respect to said vertical direction, a lower face intended to come into contact with the cable, and an opposite upper face, the element successively comprising: - a first end part provided with first connection means configured to allow connection to the neutral conductor, inside the box; - a contact part configured to be placed against the screen of the cable and in electrical contact with it, inside the box; - a holding part configured to be held against the outer face of the cable, outside the box; - a second end part provided with second connection means configured to allow connection to a conductive element connected to the ground, outside the box; the element further comprising, between the contact part and the holding part: a sealing part having a lower face which is offset with respect to the lower face of the contact part, in the vertical direction and upwards , an offset, so that, in the mounted position, there is a space between the outer face of the cable and the underside of the sealing part, the sealing part being intended to be disposed between the inside and the outside of the box.

According to other characteristics of the conductive element:

the lower face of the sealing part is substantially planar, so that, in the mounted position, it is parallel to the cable, and the lower face and / or the upper face of the sealing part is preferably smooth,

- Said offset has a thickness greater than the thickness of the sheath, so as to allow the insertion of a sealing means, such as a foam or a mastic, the additional thickness preferably being substantially equal to the thickness said sealing means,

the sealing part is rigid, preferably the whole element is rigid, and more preferably the element is made of material, preferably of metallic material, advantageously resistant to corrosion,

- the element has an identical profile, in the transverse direction,

the lower face of the holding part and the lower face of the sealing part are aligned, and preferably the lower face of the holding part and the lower face of the second end part are aligned,

the lower face of the contact part comprises a boss, in the vertical direction and downwards, shaped, in position and in length, so as to ensure contact with the screen and without coming up against the sheath,

the upper face of the contact part further comprises a recess,

the element further comprises, between the contact part and the sealing part, an intermediate part comprising a flat portion, the lower face of said flat portion being offset with respect to the lower face of the contact part, according to the vertical and upward direction, the offset preferably being substantially equal to the thickness of the sheath,

the intermediate part also comprises a dome, in the vertical direction and upwards,

the element also comprises a weakened zone, preferably in a part intended to be inside the box, still preferably in the intermediate part,

the first and / or second connection means comprise a bore capable of receiving a fixing member, such as a bolt,

The invention also relates to a device for earthing a screen of an electric cable, the cable comprising a neutral conductor, phase conductors, a conductive screen surrounding the conductors and in electrical contact with the conductor of neutral, and a sheath surrounding the screen, a stripped portion of the cable being housed, in the mounted position, in a junction or junction box intended to be buried in the ground, said device comprising: - such an element; - A first conductor housed inside the box in the mounted position, comprising a connection member able to be connected with the first connection means of the element; - A second conductor housed outside the box in the mounted position, comprising a connection member able to be connected with the second connection means of the element, and preferably the first and / or the second conductor comprises a metallic braid or a cable, and its connection member comprises an eye lug.

The invention also relates to an assembly comprising: a cable comprising a neutral conductor, phase conductors, a conductive screen surrounding the conductors and in electrical contact with the neutral conductor, and a sheath surrounding the screen, the cable having successively: a first portion without sheath and without screen, a second portion without sheath and with screen, and a third portion with sheath and with screen and in which the sheath is preferably abraded; and - such an element, the contact part being in contact with the screen, in the second portion, and the sealing part being located opposite, at a distance, from the third portion.

The invention also relates to a system comprising: - such an assembly; - A junction or junction box comprising an envelope terminating in a portion of the cable with sheath, preferably in the vicinity of the element's sealing part, the envelope being filled with a resin; - A first conductor housed inside the box and connected to the first connection means of the element, and a second conductor housed outside the box and connected to the second connection means of the element.

Several possible embodiments of the invention are now described, by way of nonlimiting examples, with reference to the appended figures:

Figure 1 shows a synoptic view of a junction, Figure 2 shows a synoptic view of a branch, Figure 3 shows in three-dimensional view an illustrative cable of those to be connected, prepared for connection, Figure 4 shows in sectional view the cable of FIG. 3, FIG. 5 shows in external view a box connecting two cables, FIG. 6 shows in perspective view an embodiment of an element according to the invention, FIG. 7 shows in side view the mounting of an element on a cable, with earth connection, figure 8 shows in side view the mounting of an element on a cable, without earth connection, figures 9 to 12 shows in profile view different embodiments of an element according to the invention, Figure 13 shows in perspective view another embodiment of an element according to the invention, Figure 14 shows in profile the mounting of the element of figure 13 on a cable, figure 15 shows in perspective view another embodiment of an element according to the invention, FIG. 16 shows in profile view the mounting of the element of FIG. 15 on a cable.

As illustrated in Figure 1 (junction) and Figure 2 (bypass), it is desired to connect at least two cables 10, 20, 30 between them. A connection is advantageously protected by means of a box 40.

As illustrated in FIGS. 3 and 4, a cable 10 comprises a neutral conductor 13 and a plurality of phase conductors 14a-c, here three in number: 14a, 14b and 14c. The neutral conductor 13 may be in one piece or made up of a plurality of wires 131 which are advantageously contiguous and is advantageously surrounded by a conductive case 132, as shown. It may alternatively comprise a plurality of wires, not necessarily contiguous, disposed peripherally around the phase conductors. In this latter embodiment, this peripheral belt acts as a screen. Each phase conductor 14a-c may consist of a plurality of wires 141 which are advantageously contiguous and is surrounded by an insulating case 142. The assembly constituted by the neutral conductor 13 and the phase conductors 14a-c is surrounded by 'a conductive screen 11, itself surrounded by an insulating sheath forming the outer wall of the cable 10. The screen 11 is for example a metallic strip, but may also be composed of multi-strands, possibly braided or mesh. It can also be confused with a peripheral neutral conductor. The possible case 132 of the neutral conductor 13 is in contact with the screen 11 which is thus at the same potential as the neutral conductor 13.

The object of the invention is to connect the screen 11 and the neutral conductor to earth. Thus, in the event of accidental perforation of a cable 10, for example by a pickaxe, a short circuit takes place between the perforated phase and the ground, rather than between the perforated phase and the earthworker.

Returning to FIG. 2. A connection box 40, here a bypass, is used to protect the connection between three cables 10, 20, 30. Each cable 10, 20, 30 comprises a screen respectively 11, 21, 31, a conductor neutral respectively 13, 23, 33 and three phase connectors: 14a, 24a, 34a for phase a, 14b, 24b, 34b for phase b, and 14c, 24c, 34c for phase c. The connection includes the electrical contacting of all the neutral connectors 13, 23, 33, between them carried out by means of a neutral connector 43, of all the connectors of each of the phases a-c, phase by phase. Thus a connector 44a of phase a connects between them the phase conductors a: 14a, 24a, and 34a, a connector 44b of phase b connects between them the phase conductors b: 14b, 24b, and 34b and a connector 44c of phase c interconnects the phase conductors c: 14c, 24c, and 34c. Figures 1 and 2 show independent connectors 43, 44a-c, for each conductor. There are also connectors 43, 44a-c mechanically secured. The box 40 comprises an envelope 41 which sealingly surrounds the ends of all the cables 10, 20, 30 in the parts where they are stripped and all the connectors 43, 44a-c. The envelope 41 is typically filled with a resin 45.

FIG. 1 illustrates a connection box 40, here a junction box, used to protect the connection between two cables 10, 20. The description in the preceding paragraph applies mutatis mutandis, by removing the references and references to the third cable 30.

FIG. 5 illustrates a junction produced by means of a box 40 between two cables 10, 20. One can see an end of the element 6, visible at the outlet of the box 40, along the cable 10.

The conductive element 6 according to the invention must electrically connect at least one neutral conductor 13, 23 or 33 with at least one of the screens 11, 21, 31, here the screen 11, and with the earth located outside of the envelope 41. Also to reach the ground, the conductive element 6 must, from inside the box 40, exit towards the outside of the box 40. This exit must be carried out while maintaining the tightness of the casing 41. According to one embodiment, this outlet is produced at one end 42 of the casing 41 at the interface between the casing 41 and a cable, here the cable 10. The connection with the neutral conductor 13 can, but need not, be produced by means of the neutral connector 43.

In order to carry out this exit / crossing of the envelope 41 in a sealed manner, a conductive element 6 is used for the earthing of a screen 11 of an electric cable 10.

FIG. 6 illustrates an embodiment of a conductive element 6. The conductive element 6 has a longitudinal direction L, a transverse direction T, and a vertical direction V. The element 6 is intended to be arranged / mounted, its longitudinal direction L aligned with the cable 10, its transverse direction T perpendicular to the axis of the cable 10 and its vertical direction V radial to the cable 10, its underside in contact with the cable 10.

The element 6 successively comprises, from left to right in FIG. 6: a first end part 60, a contact part 61, a sealing part 63, a holding part 64 and a second end part 65.

The first end part 60 is provided with first connection means 601 configured to allow a connection to the neutral conductor 13. This connection is made inside the box 40, and therefore this first end part 60 is located inside of the box 40 when the element 6 is in the position mounted on the cable 10. The contact part 61 is configured to be placed against the screen 11 of the cable 10 and in electrical contact with the latter. This contact is also made inside the box 40. The holding part 64 is configured to be held against the outside face of the cable, for example by means of a winding 53 of adhesive tape. This holding is carried out outside the box 40. The second end portion 65 is provided with second connection means 651 configured to allow connection to earth. This connection is made outside the box 40, therefore this second end portion 65 is located outside the box 40 when the element 6 is in the position mounted on the cable 10.

The sealing part 63 is, in the assembled position, disposed at the interface between the inside and the outside of the box 40 and therefore in contact with the end 42 of the casing 41. Also, in order to ensure the sealing of this interface, the lower face of the sealing part 63 is offset with respect to the lower face of the contact part 61, in the vertical direction and upwards. In other words, the underside of the sealing portion 63 is farther from the axis of the cable 10 than the underside of the contact portion 61. This makes it possible, in the mounted position, to provide a space e between the exterior face of the cable 10 and the underside of the sealing portion 63. This space is advantageously used to put in place a sealing means 52, such as a putty or a foam.

According to another characteristic, the underside of the sealing portion 63 is substantially planar. Thus, when the element 6 is mounted on the cable 10, the underside of the sealing part 63 is parallel to the cable. Thus the space e formed between the cable 10 and the sealing part 63 makes it possible to place at least one flat strip of a sealing means 52, such as a putty or a foam, wound around the cable 10, and thus favor the seal between cable 10 and element 6. Also the dimension of the space e is advantageously substantially equal to the thickness of the seal means 52, or even slightly less, if the seal means is to be compressed.

In order to seal the side of the upper face, between the element 6 and the casing 41, a sealing means 52 can also be deposited above the element 6.

Also, according to another characteristic, the lower face and / or the upper face of the sealing part 63 is preferably smooth, so as to make a sealed contact with the sealing means 52 in contact.

According to another characteristic, the offset d has a thickness greater than the thickness g of the sheath 12. This allows the insertion of the sealing means 52. The additional thickness, ie the difference dg between the offset d and l thickness g of the sheath 12 is preferably substantially equal to the thickness of said sealing means 52. In FIG. 6, it can be seen, the dimension f being substantially equal to the thickness g of the sheath 12, that the additional thickness dg is then substantially equal to df, ie equal to space e.

According to one embodiment, the sealing part 63 is rigid. According to a preferred embodiment, the entire element 6 is rigid. Preferably, the element is made in one piece. The element 6 can be made of any conductive material or capable of being made conductive. A metallic material is advantageously used. Given the conditions of use, a material having good corrosion resistance is advantageous: copper, tinned copper, tinned aluminum, or any equivalent material, including their alloys.

According to another characteristic, the element 6 has an identical profile, in the transverse direction T. In other words, according to one embodiment, the shape of the element 6 is obtained by translation of a profile in the transverse direction T. An exception to this identity can be found at the connection means 601, 651.

Figures 9 to 12 show 4 alternative and possible alternative profiles for the production of element 6.

According to another characteristic, the lower face of the holding part 64 and the lower face of the sealing part 63 are aligned. Thus the means 53 which maintains by winding and tightening the element 6 against the cable 10 ensures the plating of the element 6 against the sealing means 52. According to another characteristic, the underside of the part of holding 64 and the underside of the second end portion 65 are aligned. It follows that the element 6 runs along the cable 10.

An alternative embodiment, where the underside of the holding portion 64 and the underside of the second end portion 65 are offset or have an angle is still possible. This can be advantageous to leave more space for a fixing member 652, 653 or to facilitate mounting.

According to another advantageous characteristic, the underside of the contact part 61 comprises a boss 611, in the vertical direction V and downwards, shaped, in position and in length, so as to ensure contact with the screen 11 and without coming up against the sheath 12. The screen 11 is made visible by stripping the cable 12. Part of the element 6, for example for the embodiment of FIG. 6, presented mounted in FIG. 7, the part plane 621 bears on the sheath 12 of the cable 10 in a sheathed portion. The boss 611 then advantageously has a vertical downward offset f, substantially equal to, or even slightly greater than, the thickness g of the sheath 12, so that the boss 611 comes to bear against the screen 11 and thus ensures electrical contact between the screen 11 and the element 6. The length of this boss 611 is longitudinally less than the length of the stripped portion 16 revealing the screen 11. The shape of the boss 611 is chosen so that the contact has a large surface with the screen 11, avoiding too punctual contact, seat of risks of overheating. The distance from the boss 611 to the holding part 64 is determined so that the boss 611 faces the sheathed part 16 and does not come into contact with the sheathed part 17.

According to another characteristic, the upper face of the contact part 61 comprises a recess 612. According to one embodiment, this recess is the counter-form of the boss 611. Advantageously, this recess 612 is arranged opposite the boss 611. However, this recess 612 may be present even in the absence of the boss 611. Figures 13, respectively 15 show different shapes for the hollow 612. The advantage of the hollow 612 appears in Figures 14, respectively 16, or the element 6 of the figure 13, respectively 15, is shown mounted. A pressure means 51 is advantageously used to press the contact part 61 against the screen 11. The recess 612, mainly by its lateral edges, makes it possible to maintain said pressure means 51 longitudinally. The pressure means 51 can be a winding tape or a spring clip.

According to another characteristic, the element 6 further comprises, between the contact part 61 and the sealing part 63, an intermediate part 62. This intermediate part 62 may comprise a planar portion 621. This planar portion has the function of coming resting on the sheath 12, at the limit of the sheathed portion 17 or 18, preferably in the sheathed and abraded portion 17. The underside of said planar portion 621 is offset with respect to the underside of the contact portion 61, according to the vertical direction V and upwards, the offset f preferably being substantially equal to the thickness g of the sheath 12. The reason for this offset f has been described above.

According to another characteristic, the intermediate part 62 further comprises a dome 622, in the vertical direction V and upwards. The function of this dome 622 is to release a free volume 624 between the element 6 and the cable 10. This free volume 624 is disposed inside the box 40, opposite a portion 17, 18 where the cable 10 comprises a sheath 12, preferably opposite the portion 17 where the sheath 12 is abraded. The function of the volume 624 is to allow the presence of resin 45 in order to improve the seal. The abrasion possibly carried out on the sheath 12 promotes the adhesion of the resin 45 to the sheath 12.

It has been seen that the function of the element 6 is to allow the potential of the neutral conductor 13 to be removed from the box 40 in order to connect it to earth. In certain box locations 40, for example near a transformer station, such an earth connection is counterproductive, in that parasitic currents / voltages could rise from the earth and disturb the neutral. Also for these locations, no earth connection is desired. It is however desired to connect the screen 11 of the cable 10 to the neutral conductor 13. To respond to this problem, it is known either to cut the conductive element during assembly, or to have two element models, a short and a long. Also, according to an advantageous characteristic of the invention, the element 6 further comprises a weakened zone 623. Such a weakened zone 623, produced for example by means of a precut, is capable of allowing easier rupture of the element 6, advantageously without tools, in order to shorten it. Since the aim is not to leave the box 40, this weakened area 623 is advantageously arranged in a part of the element 6 intended to be inside the box 40. According to a preferred embodiment, the weakened area 623 is arranged in the intermediate part 62. FIG. 8 illustrates, compared with FIG. 7, the mounting of an element 6 broken at the level of the weakened zone 623.

In the assembly of FIG. 7, the element 6 is arranged between two thicknesses of mastic 52. The interface with the envelope 41 of the box 40 is effected by a contact between the envelope 41 and the mastic 52.

In the assembly of FIG. 8, the element 6 is absent from the interface with the envelope 41. The holding means 53 disappears. The interface with the envelope 41 of the box 40 is also effected by a contact between the envelope 41 and the putty 52.

According to another characteristic, the first 601 and / or the second 651 connection means comprise a bore capable of receiving a fixing member, such as a bolt 602, 652, if the bore is threaded, or a bolt matched with a nut 603, 653. This allows the fixing of the conductor 56 connected to the neutral conductor

13. The conductor 56 is advantageously a flexible means, such as a braid or a cable, respectively fixing the conductor 57 connected to the ground. The conductor 57 is advantageously a flexible means, such as a braid or a cable.

Thus, the invention brings a decisive improvement to the prior art, by providing an element 6 correcting the drawbacks of the prior art, simple and inexpensive to manufacture, simple to implement and versatile in that it allows use in at least two configurations.

It goes without saying that the invention is not limited to the embodiments described above by way of examples but that it includes all the technical equivalents and variants of the means described as well as their combinations.

Claims (15)

1. Conductive element (6) for the earthing of a screen (11) of an electric cable (10), the electric cable (10) comprising a neutral conductor (13), phase conductors (14a -c), a screen (11) conductor surrounding the conductors (13,14a-c) and in electrical contact with the neutral conductor (13), and a sheath (12) surrounding the screen (11), a stripped portion (15, 16) of the electric cable (10) being housed, in the mounted position, in a junction or junction box (40) intended to be buried in the ground, the element (6) having a longitudinal direction (L) , a transverse direction (T), and a vertical direction (V) and, with respect to said vertical direction, a lower face intended to come into contact with the cable (10), and an opposite upper face, the element (6 ) successively comprising: a first end portion (60) provided with first connection means (601) configured to allow connection to the neutral conductor (13), inside the box (40); a contact part (61) configured to be placed against the screen (11) of the cable (10) and in electrical contact with it, inside the box (40); a holding part (64) configured to be held against the outer face of the cable (10), outside the box (40); a second end portion (65) provided with second connection means (651) configured to allow connection to a conductive element connected to the ground, outside the box (40); characterized in that the element (6) further comprises, between the contact part (61) and the holding part (64): - a sealing part (63) having a lower face which is offset with respect to the lower face of the contact part (61), in the vertical direction (V) and upwards, by an offset (d) , so that, in the mounted position, there is a space (e) between the outer face of the cable (10) and the underside of the sealing part (63), the sealing part (63) being intended to be disposed between the inside and the outside of the box (40). 2. Element (6) according to claim 1, characterized in that the underside of the sealing part (63) is substantially planar, so that, in the mounted position, it is parallel to the cable (10), and the lower face and / or the upper face of the sealing part (63) is preferably smooth. 3. Element (6) according to one of claims 1 or 2, characterized in that said offset (d) has a thickness greater than the thickness (g) of the sheath (12), so as to allow insertion a sealing means (52), such as a foam or a mastic, the additional thickness (dg) being preferably substantially equal to the thickness of said sealing means (52). 4. Element (6) according to one of claims 1 to 3, characterized in that the sealing part (63) is rigid, preferably all the element (6) is rigid, and still preferably the element (6) is made of material, preferably metallic material, advantageously resistant to corrosion. 5. Element (6) according to one of claims 1 to 4, characterized in that the element (6) has an identical profile, in the transverse direction (T). 6. Element (6) according to one of claims 1 to 5, characterized in that the lower face of the holding part (64) and the lower face of the sealing part (63) are aligned, and preferably the underside of the holding portion (64) and the underside of the second end portion (65) are aligned. 7. Element (6) according to one of claims 1 to 6, characterized in that the lower face of the contact part (61) comprises a boss (611), in the vertical direction (V) and downwards, shaped, in position and in length, so as to ensure contact with the screen (11) and without coming up against the sheath (12). 8. Element (6) according to one of claims 1 to 7, characterized in that the upper face of the contact part (61) further comprises a recess (612). 9. Element (6) according to one of claims 1 to 8, characterized in that the element (6) further comprises, between the contact part (61) and the sealing part (63), a part intermediate (62) comprising a flat portion (621), the lower face of said flat portion (621) being offset with respect to the lower face of the contact part (61), in the vertical direction (V) and upwards , the offset (f) being preferably substantially equal to the thickness (g) of the sheath (12). 10. Element (6) according to claim 9, characterized in that the intermediate part (62) further comprises a dome (622), in the vertical direction (V) and upwards. 11. Element (6) according to one of claims 1 to 10, characterized in that the element (6) further comprises a weakened zone (623), preferably in a part intended to be inside the box (40), still preferably in the intermediate part (62). 12. Element (6) according to one of claims 1 to 11, characterized in that the first and / or second connection means (601, 651) comprise a bore capable of receiving a fixing member (602, 603, 652, 653), like a bolt. 13. Device for earthing a screen (11) of an electric cable (10), the cable (10) comprising a neutral conductor (13), phase conductors (14a-c), a screen (11) conductor surrounding the conductors (13, 14a-c) and in electrical contact with the neutral conductor (13), and a sheath (12) surrounding the screen (11), a stripped portion (15, 16) the cable (10) being housed, in the mounted position, in a junction or junction box (40) intended to be buried in the ground, characterized in that said device comprises: - an element (6) according to one of the preceding claims; - A first conductor (56) housed inside the box (40) in the mounted position, comprising a connection member (602, 603) capable of being connected with the first connection means (601) of the element ( 6); - a second conductor (57) housed outside the box (40) in the mounted position, comprising a connection member (652, 653) capable of being connected with the second connection means (651) of the element ( 6), and preferably the first and / or the second conductor (56, 57) comprises a metal braid or a cable, and its connection member (602, 603, 652, 653) comprises an eye terminal. 14. Set including: a cable (10) comprising a neutral conductor (13), phase conductors (14a-c), a conductive screen (11) surrounding the conductors (13, 14a-c) and in electrical contact with the neutral conductor ( 13), and a sheath (12) surrounding the screen (11), the cable (10) having successively: a first portion (15) without sheath and without screen, a second portion (16) without sheath and with screen, and a third portion (17) with sheath and with screen and in which the sheath is preferably abraded; and 5 - an element (6) according to one of claims 1 to 12, the contact part (61) being in contact with the screen (11), in the second portion (16), and the sealing part ( 63) being located opposite, at a distance, from the third portion (17). 10 15. System comprising: an assembly according to claim 14; a junction or junction box (40) comprising an envelope (41) terminating in a portion (17) of the cable (10) with sheath, preferably in the vicinity of the sealing part (63) of the element (6) , The envelope (41) being filled with a resin (45); a first conductor (56) housed inside the box (40) and connected to the first connection means (601) of the element (6), and a second conductor (57) housed outside the box (40) and connected to the second connection means (651) of the element (6).