FR2697376A1 - Cage-type unipolar connector for electric cables - has body with internal cavity with grooved jaws and grooves at base of cavity which clamp electric cable when bolts are screwed closed - Google Patents

Abstract

The cable connector is made up of a rectangular shaped body (3) with an inner open ended cavity (6). The base of the cavity (11) is grooved, and the top of the cavity (7,8) has slots into which slides an upper section (14) to close the inner cavity. The upper section has two connectors (31,34) each made up of stud connectors on threaded bolts. The bolts protrude through the upper section to the cavity and have grooved jaws (24) inside the cavity. Screwing the bolts closes the grooved jaws around a cable inserted into the cavity. A protective shield is placed around the protruding connectors outside the cavity. ADVANTAGE - Can be used for different cable types and mfr. is simplified.

Description

CAGE TYPE SINGLE POLE CONNECTOR
FOR ELECTRIC CABLE.

TECHNOLOGICAL BACKGROUND OF THE INVENTION
The subject of the present invention is a unipolar electrical connector, of the cage type, used for making the necessary connections between the conductors of the cables of an electrical installation.

 There are already many models of cage connectors known from the state of the art.

 More specifically, the subject of the present invention is a single-pole connector designed for a device which makes it possible to cut off an electrical distribution line and to make branch connections of cables intended to supply different subscribers.

 The main connection of a three-phase low-voltage high-power distribution line generally consists of an incoming cable and a large-sectioned starting cable (150 mm2 for a maximum current of 300 A, or 240 mm2 for a maximum current of 400 A) coming out of the ground vertically at the base of the electrical cabinet of the installation.

 To the incoming cable must be connected one or more other power cables of different types and different sections, which in turn depend on the power required by the subscriber or subscribers. This connection can be a power diversion by cables of 150 mm2 or 95 mm2 of section, if it is a question of serving groups of subscribers, or by cables with aluminum core of 35 mm2 of section, or by stranded copper cables of 20 mm2 section, if it is to serve individual subscribers.

 Handling these cables is difficult, due to their mechanical rigidity, and wiring electrical cabinets generally requires specialized tools, both for bending the largest cables and for stripping the smallest.

 In addition, electrical continuity between the incoming cable and the outgoing cable must be ensured.

 Certain devices making it possible to connect a shunt cable to a main cable are known from the state of the art.

 As a first example of illustration of the state of the art, mention may be made of European patent application EP-0,342,122 filed by the company Sicame, and published on November 15, 1989. The invention which is described there relates to electrical connectors branch having two jaws to be brought closer to each other, under the control of clamping means, and adapted to define between them at least two parallel channels, one for the main cable, from which the branch, the other for a second cable, or branch cable, to be connected to the previous one. In general, the subject of the invention is a type of connector making it possible to facilitate assembly operations.

We can also cite the European patent application
EP-0.338.952 deposited by the company Simel, and published on October 25, 1989, which relates to a unipolar connector of derivation of the type with insulation perforation. This type of connector does not require prior stripping of the two cables. In this case also, the invention intends to propose an improvement of the known devices and it possibly allows mounting with one hand.

 However, if improvements have been made to the branch connectors, these have been carried out mainly for overhead line connectors and independently of the specific wiring problems of electrical cabinets.

 A pluggable electrical connector that is fixed on a plate, on an electrical panel or inside a box, in order to control or cut on demand the electrical supply of circuits or devices from of one or more cables, is described in European patent application EP-0.153.257 filed by the Société de Travaux Electriques, and published on August 28, 1985.

 The main advantage of the connector described in this application lies in its method of manufacture from extruded metal profiles.

 But, in particular, the problem of the existence of several types of cables of different sections remains posed. The connectors described in applications EP-0.342.122 and EP-0.338.952 only allow the connection of cables of substantially identical sections.

 In addition, no safety device is provided for possible handling under voltage.

 European patent application EP-0.311.537 filed by Jacques Pierson de Brabois, and published on April 12, 1989, describes a connection terminal allowing the connection of several electric cables of different sections which enter on the same side of the terminal and which are trapped in stacked individual dwellings. However, this type of connector does not seem suitable for high power cables.

 The electrical cabinets generally contain, in addition to the electrical protection devices for the lines and the devices for accounting for the consumption of electrical energy, insulating boxes or boxes enclosing the ends of the cables of the main connection as well as those of the different branches. The connectors are distributed in a plane and kept separate from each other on a support, in rows and columns.

 This distribution of connectors on a sort of grid gives this type of junction box, by means of which the incoming and outgoing cables are also electrically connected, the name "false cut grid".

 When the aforementioned grid includes an incoming cable but no outgoing cable, it takes the name of "staring grid".

GENERAL DESCRIPTION OF THE INVENTION
The present invention aims to overcome the drawbacks associated with the use of unipolar cage type connectors, of conductive material, for electrical cables comprising several conductors of different sections distributed in one or more ranges of values and already known from the state of the prior art.

 These connectors generally allow each of the conductors of several cables to be connected together so as to produce a predetermined set of connections.

The cage type unipolar connector according to the invention facilitates this operation. It is remarkable in that it mainly consists of:
a) of an elongated body of concave prismatic shape, the concavity being turned upwards, having two external lateral faces forming a sharp dihedral, two parallel internal lateral faces each having at their upper part a groove of trapezoidal section, an external face lower comprising at least one tapped blind hole intended for a fixing element, a lower concave inner face in contact with the conductor of one of said cables, formed by an obtuse dihedron so as to adapt to different diameters of said conductor, although that said body is produced in a limited number of sizes, and comprising grooves capable, thanks to a serrated section, of perforating an oxide layer and thus ensuring better contact;
b) a generally parallelepipedal slide having two large elongated side faces, a large upper elongated face, a large lower elongated face, and at least one tapped hole with an axis perpendicular to said lower and upper faces of said slide, said lateral faces each comprising a longitudinal projection of complementary shape to each of the grooves of the internal lateral faces of the body, said lower face of the slider comprising a longitudinal recess;
c) at least one shoe of generally parallelepipedal shape having two large elongated parallel lateral faces, a large elongated convex upper face of complementary shape of said longitudinal recess of the slide, a large elongated lower concave face in contact with one of said conductors one of said cables, formed by a cylindrical surface so as to adapt to different diameters of said conductor, although said shoe is produced in a limited number of sizes, and comprising grooves capable, thanks to a serrated section, of perforating an oxide layer and thus ensuring better contact, said shoe further comprising a chamfered hole with an axis perpendicular to said upper and lower faces of said shoe;
d) at least one screw of the type with limitation of the tightening torque by rupture, the threaded central part of which is normally engaged by screwing in the corresponding threaded hole of the slide and the non-threaded end of which is engaged in the chamfered hole of the shoe, said shoe being held by stamping said non-threaded end of said screw;
e) a support washer placed between said threaded part of said screw and said unthreaded end engaged in said chamfered hole of said shoe, the respective dimensions of said slide and of said body being such that said projections can slide in said grooves to allow the mounting of said connector and the positioning of said shoes and so as to constitute in cooperation with said lower inner face an effective clamping device for said conductors of different sections.

 In a preferred embodiment, the unipolar connector with cage can also comprise a cylindrical insulating plastic part allowing a handling without tension of the slide, to improve the safety of the people, and also allowing a precise positioning of the slide in the grooves of the body corresponding, in order to guarantee the mechanical and electrical performance of said connector.

 The cage connectors according to the invention are preferably used to ensure the connection of the various conductors of an electrical distribution line to a false cut-out grid or to a staring grid and to make connections in derivation of cables intended to supply subscribers.

 The incoming or outgoing cables of the distribution line, as well as the subscriber cables (group of subscribers or individual subscriber) are generally of different sections.

 The false cut-out grid or the staring grid using the connectors according to the invention therefore comprises connectors of one or more sizes suitable for clamping conductors of different sections distributed in one or more ranges of values.

 Advantageously, the connectors are then arranged in the plane of the false cut grid or in the plane of the star grid so that the radius of curvature of each of the cables is smaller the greater its cross section.

 They are preferably supported directly by busbars in a number equal to the number of phases of the power line plus one.

 The conductive bars can be fixed on a lower support plate which also supports an upper screen plate, and the lower and upper plates can be made of insulating material, the screen plate further comprising compartments ensuring the separation of the connectors.

 The high-power polyphase electrical distribution line is preferably a low-voltage three-phase line whose incoming or outgoing cables are cables of large sections, and in the plane of the false cut grid these cables follow a clear axial path and remain practically straight when tightened in the connectors.

 In the plane of a so-called star grid, it is the only incoming cable which of course follows the axial project released so as to remain substantially rectilinear when it is tightened in the connector.

 The subscriber group cables and the cables intended for individual subscribers, which are respectively cables of medium and small cross-sections, are then advantageously distributed as a fan on either side of the input or outgoing cables, and they are slightly curved for their connections to the connectors.

 According to a preferred embodiment of the invention, the grid, whether it is a false cut or a star, comprises cage connectors of three different sizes suitable respectively for clamping conductors of three ranges of different sections, and insulation piercing connectors (not described here) of a single size suitable for clamping conductors of two ranges of different sections depending on the type of cable.

 Preferably also, the various elements of the unipolar connector of the cage type according to the invention are advantageously produced from cut elements of metal profiles obtained by extrusion.

 The appended drawings, given by way of purely illustrative examples, and without limitation, will make it possible to better understand the characteristics of the invention and the advantages which it is capable of providing.

BRIEF DESCRIPTION OF THE DRAWINGS
Figures 1 to 11 are views of two preferred embodiments of unipolar connectors of the cage type according to the invention.

 Figure la is a perspective view showing the different elements of a double cage connector. In Figure 1b, this connector is provided with a plastic insulating part according to the invention. In Figure lc, we see the assembly consisting of the plastic part, the slide, the two shoes and the clamping screws, separated from the connector body. Figure 2 is a perspective view of the slide, while Figure 3 is that of one of the shoes.

 Figures 4a, 4b, 5 and 6 are respectively front views of the connector of Figure la, the same connector provided with the plastic part of Figure lb, the slide of Figure 2 and the shoe of Figure 3.

 Figure 7 is a vertical and cross-section through the body of the connector as shown separately in Figure 4a.

 Figure 8 is a vertical and longitudinal cross section of the shoe of Figure 6. Figure 9 is a perspective view of the insulating part appearing in Figures lb, lc and 4b.

 Figures 10a and 10b show a single connector with its insulating part, variant of the double connector seen in Figures 1b and îc. Figure 11 is a perspective view of the insulating part appearing in Figures 10a and 10b.

 Figures 12 to 14 are general views of a preferred embodiment of the false cut grid for the implementation of connectors according to the invention.

 Figure 12 shows the general arrangement of cables and connectors.

 Figure 13a is an exploded view showing the arrangement of the various elements of the device, in particular the connectors and the upper insulating part.

 Figure 13b is an exploded view also showing the arrangement of the various elements of the device, in particular the busbars supporting the connectors and the lower insulating part.

 Figure 14 is a general view of the false cut gate according to a preferred embodiment of the invention.

DESCRIPTION OF THE PREFERRED PERFORMANCE FORMS OF
THE INVENTION
The references to Figures 1 to 11 will serve to explain how the various elements of the invention are articulated.

A single-pole connector of the cage type according to the invention consists of:
a) an elongated body (1) of concave prismatic shape, the concavity (2) being turned upwards, as it appears on the perspective views of Figures la, lb or lc and on the front views of the Figures 4a and 4b, or in the cross section of Figure 7. The body (1) has two external lateral faces (3,4) forming a sharp dihedral and two parallel internal lateral faces (5,6) each having their upper part a groove (7,8) of trapezoidal section. The lower external face (9) comprises at least one tapped blind hole (10) intended for a fixing element, as it can be seen on the section of FIG. 7. The lower internal face (11) concave, which is called to be in contact with the conductor of one of the cables (47,48,49), is formed by an obtuse dihedral (12) so as to adapt to different diameters of the conductor. This face has grooves (13) capable, thanks to a serrated section, of perforating an oxide layer and thus ensuring better contact;
b) a slider (14) of generally parallelepipedal shape as can be seen in FIG. 2. The slider has two large elongated side faces (15,16), a large elongated upper face (17), a large elongated face lower (18), and at least one tapped hole (19,20) with an axis perpendicular to the lower (18) and upper (17) faces. As it can be clearly seen in FIGS. 2 and 5, the lateral faces (15 , 16) each have a longitudinal projection (21,22) of complementary shape to each of the grooves (7,8) of the internal lateral faces (5,6) of the body (1). It should be noted that the lower face (18) of the slide (14) has a longitudinal recess (23);
c) at least one shoe (24) of generally parallelepiped shape as shown in FIG. 3. This shoe has two large elongated parallel side faces (25, 26), a large elongated convex upper face (27) of complementary shape of the longitudinal recess (23) of the slide (14) and a large concave lower elongated face (28) in contact with the conductor of one of the cables (47,48,49). Thus, the contact surface is formed by a cylindrical surface, so as to adapt to different diameters of the conductor, and it has grooves (29) capable, thanks to a serrated section, of perforating an oxide layer and also ensuring better contact. The section of Figure 8 shows that the shoe (24) further comprises a chamfered hole (30) with an axis perpendicular to the upper (27) and lower (28) faces;
d) at least one screw (31,32) of the type with limitation of the tightening torque by rupture, the threaded central part (33,34) of which is normally engaged by screwing in the corresponding tapped hole (19,20) of the slide (14) and whose non-threaded end (35,36) is engaged in the chamfered hole (30) of the shoe (24). The shoe (24) is held by matting the non-threaded end (35,36 ) of the screw (31,32);
e) a support washer (37), which only appears in FIGS. 4a and 4b, placed between the threaded part (33,34) of the screw (31,32) and the non-threaded end (35, 36) engaged in the chamfered hole (30) of the shoe (24).

 The respective dimensions of the slide (14) and of the body (1) are such that the projections (21,22) can slide in the grooves (7,8), so as to allow the mounting of the connector, and the positioning of the shoes ( 24) is such that their grooved concave lower faces (28) constitute, in cooperation with the lower internal face (11) of the body (1), an effective connection device for cables of different sections.

It can be seen in Figures 1b, 1c and 4b that the connector advantageously includes an additional element. It is a plastic part (40) providing the following functions:
- centering of the slide (14) relative to the body (1), in order to guarantee the mechanical and electrical performance of the connector;
- Maintaining the slide (14) before tightening the cable, to facilitate the implementation of the product;
- handling the slide (14) with the power off to improve personal safety.

 To ensure mounting, each of the slides (14) has on the large lateral faces (15,16), above the projections (21,22), longitudinal grooves (38,39). These grooves (38,39) are capable of ensuring an assembly of the insulating part (40) by interlocking, this part therefore having at its base two complementary projections (41,42), as can be seen by comparing Figures 2 and 9.

 The part (40) has the general shape of a cylinder so as to wrap the screws (31, 32) as shown in Figures lb and lc.

 Maintaining the clamping position of the slide (14) is achieved by means of elastic protuberances (43,44) and antagonistic stop means (45,46) blocked on the body (1), the stop means (45) being elastically erasable.

 This design of the cage connector makes it possible to limit the number of models of different sizes that it is necessary to provide for ensuring the connection of cables of different sections.

 Three cage connector models of three different sizes are then sufficient for cables with a section of 35 to 95 mm2, from 35 to 150mm2 and from 35 to 240mm2.

 The model with a clamping capacity of 35 mm2 to 95 mm2 is a single shoe model as shown in Figures 10a and 10b.

This model is identical, in principle, to the double shoe connectors having a higher clamping capacity described above in relation to Figures 1 to 9.

 It can be used to connect the neutral conductors of the incoming (47) and outgoing (48) cables to the false-cut grid using these connectors, a grid which will now be described in detail in conjunction with FIGS. 12 to 14.

 Models with an intermediate clamping capacity of 35 to 150 mm2 are used for the subscriber group cable (49).

This cable (49) is slightly offset from the axial path of the main cables, as seen in Figure 12, and must therefore be twisted. But this is acceptable because its section is less strong.

 For cables of section less than or equal to 35 mm2, such as cables intended for an individual subscriber (50), another type of connector has been produced. n allows the connection of cables with solid aluminum core of 16 to 35 mm2 of section or of multi-strand copper cables of 10 to 20 mm2 of section without prior stripping. This connector, called "with insulation perforation", will not be described here.

 In this way, the cables (47,48) do not need to be twisted to be inserted into the cage connectors (51,52), a twist which is difficult to achieve without tools for cables of large section, and they follow an axial path on the false cut gate (53). Indeed, the phase conductors and the neutral conductors can each be individually twisted more easily than the cables themselves and their ends can therefore be distributed without difficulty by hand, in a fan pattern, on either side of the axial path ( 54.55) of the main cables (47.48).

 We see in Figures 13a and 13b how the different connectors (51,52) are arranged on the four conductive bars (56) which provide the electrical connections for each of the three phases and the neutral between the different cables (47,48,49 ).

 The conductive bars (56) are supported by a lower support plate (57). An upper screen plate (58) ensures by means of compartments (62) the isolation of the various connectors (51,52).

 All of these elements are generally arranged in an electrical cabinet, not shown, above the cables of the main connection (47,48).

 We can see on the perspective of Figure 14 how are used the different connectors in a particular execution of false cut grid.

 It is the GFC 240 grid model which includes cage connectors (59, 60, 61) of three different sizes suitable respectively for clamping conductors of three ranges of different sections, from 35 mm2 to 95 mm2, from 35 mm2 to 150 mm2 and from 35 mm2 to 240 mm2, described at the beginning of this presentation, as well as the insulation perforation connectors of a single size suitable for clamping conductors of two ranges of different cross-sections depending on the type of cable, 16 mm2 to 35 mm2 for solid aluminum cables and 10 mm2 to 20 mm2 for copper stranded cables, not described. Another model of false cut-out grid (model GFC 150), not shown, is suitable for the main connection by cables (incoming and outgoing) of 150 mmg in cross-section and to the power branch by cable of 95 mm2 of cross-section. differs from the GFC 240 model only in the size of the cage connectors used.

 It goes without saying that the invention is not limited to the sole embodiment of the connectors, nor to the embodiment of the false-cut grid, described above by way of examples; on the contrary, it embraces all variant embodiments.

 Similarly, the invention can be understood in the same terms in its application to a star grid. On this grid, only one type of incoming cable (47) must be connected. In this case, it is clear that the connectors (52, 52) are arranged on the plate in the same way as that shown in FIGS. 12 to 14, with the only difference being the presence of a single connector (51) in the central part released from the plate. The incoming cable (47) then follows substantially the axial path (54, 55) and it has no need to be twisted. The other conductors (49, 50) are arranged on either side of the fan cable, as a fan, as illustrated in FIGS. 12 to 14.

Claims (13)

 1) Single-pole connector (51,52) of the cage type, made of conductive material, for electric cable (47,48,49) comprising several conductors of different sections distributed in one or more ranges of values, said connector allowing the connection between them from each of said conductors of several of said cables (47,48,49) so as to produce a predetermined set of connections, said connector being characterized in that it is composed of:  a) of an elongated body (1) of concave prismatic shape, the concavity (2) being turned upwards, having two external lateral faces (3,4) forming a sharp dihedron, two internal lateral faces (5,6) parallel each having at their upper part a groove (7,8) of trapezoidal section, a lower external face (9) comprising at least one tapped blind hole (10) intended for a fixing element, a lower internal face (11) concave in contact with the conductor of one of said cables (47,48,49), formed by an obtuse dihedral (12) so as to adapt to different diameters of said conductor, although said body (1) is made in one limited number of sizes, and comprising grooves (13) capable, thanks to a serrated section, of perforating an oxide layer and thus ensuring better contact;  b) a slide (14) of generally parallelepiped shape having two large elongated side faces (15,16), a large upper elongated face (17), a large lower elongated face (18), and at least one tapped hole ( 19, 20) of axis perpendicular to said lower (18) and upper (17) faces of said slide (14), said lateral faces (15, 16) each comprising a longitudinal projection (21, 22) of longitudinal shape complementary to each of the grooves (7,8) of the internal lateral faces (5,6) of the body (1), said lower face (18) of the slide (14) having a longitudinal recess (23);  c) at least one shoe (24) of generally parallelepiped shape having two large elongated parallel lateral faces (25, 26), a large elongated convex upper face (27) of complementary shape of said longitudinal recess (23) of the slide (14) ), a large elongated lower face (28) concave in contact with one of said conductors of one of said cables (47,48,49), formed by a cylindrical surface so as to adapt to different diameters of said conductor, although said shoe (24) is produced in a limited number of sizes, and comprising grooves (29) capable, thanks to a serrated section, of perforating an oxide layer and thus ensuring better contact, said shoe ( 24) further comprising a chamfered hole (30) with an axis perpendicular to said upper (27) and lower (28) faces of said shoe (24);  d) at least one screw (31,32) of the type limiting the tightening torque by rupture, the threaded central part (33,34) of which is normally engaged by screwing in the corresponding tapped hole (19,20) of the slide (14) and whose non-threaded end (35,36) is engaged in the chamfered hole (30) of the shoe (24), said shoe (24) being held by stamping of said non-threaded end (35,36) of said screw (31,32) ;;  e) a support washer (37) placed between said threaded part (33,34) of said screw (31,32) and said non-threaded end (35,36) engaged in said chamfered hole (30) of said shoe (24), the respective dimensions of said slide (14) and said body (1) being such that said projections (21,22) can slide in said grooves (7,8) so as to allow the mounting of said connector (51,52 ) and the positioning of said shoes (24) and so as to constitute, in cooperation with said lower internal face (11), an effective clamping device for said conductors of different sections.  2) Unipolar connector (51,52) of the type according to claim 1, characterized in that it comprises an insulating cylindrical piece (40) of plastic material, allowing a voltage-free manipulation of the slide (14) to improve personal safety .  3) Single-pole connector (51,52) with cage according to any one of claims 1 and 2, characterized in that it comprises an insulating cylindrical piece (40) of plastic material allowing precise positioning of the slide (14) in the grooves (7,8) of the corresponding body (1), in order to guarantee the mechanical and electrical performance of said connector (51,52).  4) unipolar connector (51,52) with cage according to any one of claims 2 or 3, characterized in that the slide (14) has large lateral faces (15,16) comprising, above the projections (21 , 22) longitudinal, grooves (38,39) capable of ensuring assembly by interlocking with the insulating cylindrical part (40) made of plastic, said insulating part (40) enveloping the screws (31,32) and having at its base two projections (41,42) complementary to said grooves (38,39).  5) Single-pole connector (51,52) with cage according to claim 4, characterized in that the insulating piece (40) allows said slide (14) to be held in the clamping position by means of elastic protuberances (43,44) and at antagonistic stop means (45,46) blocked on said body (1), at least some stop means (45) being elastically erasable.  6) Single-pole connector (51,52) with cage according to any one of Claims 1 to 5, characterized in that the connector (51,52) is produced in three different sizes suitable respectively for clamping conductors of three ranges of sections different, preferably from 35 mm2 to 95 mm2, from 35 mm2 to 150 mm2 (59.60) and from 35 mm2 to 240 mm2 (61).  7) False cut grid (53) for the implementation of connectors (51,52) according to any one of claims 1 to 6, making it possible to cut a polyphase electrical distribution line of high power by disconnection of incoming (47) or outgoing (48) cables and making taps intended to supply at least one group of subscribers, with at least one cable (49) for group of subscribers, or at least one subscriber individual, by at least one individual subscriber cable (50), said incoming (47) or outgoing (48) cables, said subscriber group cables (49) and said individual subscriber cables (50) being of different sections, characterized in that said connectors (51,52) ensuring the connection of said cables (47,48,49) are arranged in the plane of said false cut grid (53) so that the radius of curvature of each of said cables (47, 48, 49) is smaller the greater its section.  8) False cut grid (53) according to claim 7, characterized in that the connectors (51,52) are supported directly by conductive bars (56) in a number equal to the number of phases of the power line plus one.  9) False cut-off grid (53) according to claim 8, characterized in that the high-power polyphase electrical distribution line is a low-voltage three-phase line whose incoming (47) or outgoing (48) cables are cables of large sections which follow an axial path (54, 55) cleared in the plane of said grid (53), and remain practically straight when tightened in the connectors (51), while the cables (49) of group d subscribers and the individual subscriber cables (50) are respectively cables of medium and small sections distributed in fan on either side of said incoming (47) or outgoing (48) cables, and slightly curved for their connections to said connectors (51, 52).  10) Grid of false cut (53) according to claim 8 or 9, characterized in that it comprises a lower support plate (57) of insulating material, on which are fixed the conductive bars (56), and an upper screen plate (58) in insulating material having compartments (62) ensuring the separation of the connectors (51,52).  11) Starter grid for the implementation of connectors (51, 52) according to any one of claims 1 to 6, making it possible to supply at least one group of subscribers, with at least one cable (49) of subscriber group, or at least one individual subscriber, by at least one individual subscriber cable (50), the incoming cable (47), said subscriber group cables and said cables (50) individual subscriber being of different sections, characterized in that said connectors (51,52) ensuring the connection of said cables (47,48,49) are arranged in the plane of said false cut grid (53) so that the radius of curvature of each of said cables (47,48,49) is smaller the larger its section.  12) Starter grid according to claim 11, characterized in that the high-power polyphase electrical distribution line is a low-voltage three-phase line whose incoming cable (47) is a cable of large section which follows an axial path (54,55) released in the plane of said grid (53), and remains practically straight when tightened in the connector (51), while the cables (49) of subscriber group and the cables (50) d 'individual subscriber are respectively cables of medium and small sections distributed in fan on either side of said incoming cable (47), and slightly curved for their connections to said connectors (51, 52).  13) A method of manufacturing the unipolar connector (51,52) with cage according to any one of claims 1 to 6, characterized in that the body (1), the slide (14) and the shoe or shoes (24) are made from cut elements of metal profiles obtained by extrusion.