EP2315217B1 - Set for producing an electric installation - Google Patents

Description

The invention relates to a set for producing an electrical installation comprising a continuous flat cable with data lines and at least one connection device for stripping-free Anzapfkontaktierung the data lines. The data lines are surrounded by a shield which, apart from end seams of the shielding film, has seams or overlaps only on the narrow sides of the flat cable, so that the flat sides to be tapped are free from seams / overlaps.

Electrical installation systems in which a connecting flat cable with a plurality of in-plane data conductors without separation of the wires and without removal of wire and cable insulation and shielding can be tapped with a connection device, are known from the prior art. An early related patent document from the Applicant's house is the DE 4402837 C2 , The hybrid flat cable with power and data lines described herein can be tapped without insulation by means of connecting devices. The connecting device is placed on a flat side of the flat cable and has cutting as a tapping contact, which slit the current and data cores to be tapped in the longitudinal direction and thus brings about a contact. As part of the tapping process of the data lines and their shield is pierced.

Subsequent developments are primarily dedicated to the problem of securely connecting shielded data conductors by suggesting improvements on the connector side. For example, the latter learns in the patent application DE 102007041814 A1 an optimization by special design of the cutting contacts and their storage on a moving in the cable longitudinal direction pressure plate. Pulling the shield in the direction of the exposed by the cutting contacts wires should thus be counteracted.

Specific embodiments of shields of non-twisted data conductors are described, for example, in the European patent specification EP 0 214 276 B1 and the US patent US 5,900,588 described. The main focus of the proposed variants of the shield is to ensure good electrical data transmission properties and a robustness against external mechanical effects.

Various configurations of shielding seams and overlaps in data cables are disclosed, for example, in the patents CA 1 242 006 and US 5,367,123 and the application letter EP 0 301 859 explained. Thereafter, shields are wrapped in the form of laminated metal foils around the data conductors, with one end of the laminated film being folded back for complete shielding, so that the metal sides of the foil lie on top of each other, are electrically connected to each other, thus forming a complete Faraday cage.

The set according to the invention for producing an electrical installation has at least one flat cable and at least one connecting device complementary to the flat cable with tapping contacts for the stripping-free tapping of the flat cable. The flat cable comprises at least one pair of data conductors which run untwisted in parallel. The data conductors are surrounded by a shield which, apart from possibly existing end seams at the shielding end, has seams only on the narrow sides of the flat cable, so that the flat sides to be penetrated by the tapping contacts are free of any shielding seams. The tap contacts are insulated from the shield, so that the data conductors can be tapped by penetrating the shield through the tap contacts, without there being a penetration in the region of a shielding seam.

According to a further aspect, an electrical installation is proposed in which the flat cable is tapped with the connection device, that is to say that the shield has been pierced by the tapping contacts in the regions of the flat sides which are free of the shielding seam.

Due to the defined positioning of the shielding seams outside the tapping areas, for example, unintentional tearing and / or pulling in of the shielding becomes counteracted. The invention thus aims at a trouble-free penetration of the shield by the tap contacts and thus on a secure tap shielded data conductor.

The set according to the invention for producing an electrical installation comprises a flat cable with shielded data conductors and at least one connection device suitable for the flat cable for a stripping-free tap connection of the data conductors to basically any longitudinal positions of the flat cable. The "fitting" of the connection device to the flat cable on the one hand affects the outer shape of both parts of the sentence. This is such that their geometry is coordinated so that the connection device can be placed on the flat cable for the purpose of tapping. Preferably, it is ensured that there are only certain possibilities of this placement in order to allow a correct tapping.

On the other hand, the "fit" is also expressed in the position of the data conductor and the tapping contacts provided for tapping on the connection device. The longitudinal position of the data conductors in the flat cable is firmly defined in that they run as parallel as possible and untwisted, for example, in a surrounding embedding, at a fixed distance from one another. Due to this defined longitudinal position, a successful stripping-free tapping of the conductors is made possible. The tapping contacts of the terminal device correspond to the number of data conductors and are aligned with their known position in the cable. Thus, it is ensured that the data conductors are "hit" after the attachment of the connection device on the flat cable with the tap contacts and the tapping is successful.

As is known, the electrical data transmission in a data conductor is sensitive to external electromagnetic interference (exception are the known optical waveguides, which are not tap taping by Anzapfkontaktierung but, for example, be connected by plug or splice at the cable end). It therefore makes sense to protect data conductors against such interference. In a course of data lines in the vicinity of significant sources of electromagnetic interference, a Shielding may even be necessary to ensure a functioning data transfer at all. This is the case, for example, with cables which, in addition to data lines, also accommodate a power supply (so-called hybrid cables). The current conductors running in the immediate vicinity of the data lines cause an electromagnetic field which causes interference interference for signal transmission in the adjacent data conductors. Even a pure data cable without a power supply component may experience interference if it is used near a foreign (not your own) power cable or other source of interference.

Such untwisted data conductors in flat cables, which are provided with a shield designed closer, are already basically from the European patent EP 0 214 276 B1 and the US patent US 5,900,588 known. The type of shielding the data conductor is there, however, priority from aspects of data transmission (eg, the best possible shielding of interference, low attenuation, little bit offset, etc.) or any mechanical effects (eg good data transmission even when bending the cable or external pressure, eg pedaling on a laid under a carpet flat cable) optimized. In contrast, the present invention focuses on the particular configuration of the data conductor shield in the flat cable, taking into account the stripping-free tap. The data conductors should in principle be able to be tapped without stripping at any longitudinal position. Accordingly, in the present case, the shielding is aligned with such a tap, ie puncturing or cutting through the conductor shield at any desired longitudinal positions of the flat cable.

As is known, the piercing of the shield takes place in the context of the tapping operation on one of the two flat sides of the flat cable (see DE 4402837 C2 ). Because the conductors to be tapped run in the flat cable harness substantially in the flat plane next to each other, so that ideally tapped approximately vertically to this plane (the penetration of tapping contacts not necessarily be linear, but as in the type of DE 102007041814 A1 in the cable longitudinal direction movable tapping contacts, for example, elliptical nature may be). In these known electrical Installation systems do not provide for tapping-piercing data conductor shielding. Rather, as already mentioned above, the shielding is designed solely for the purpose of the best possible data transmission, or else its detailed design simply left open.

In accordance with the invention, particular attention is now paid to the localization of interfaces of the data conductor shield ("seams" are understood to mean not only joint-like or plane abutting ends of shielding foils but, for example, also all types of overlaps, including those with simple or deviating from the usual usage repeatedly folded back ends, as they are approximately from the US 5,367,123 or US 5,900,588 are known. Thus, "seams" or "seams" are used herein as generic terms of all types of connections of shielding edges.). It has been recognized that such seams may present problems in the area of tap areas where the shield is pierced. On the one hand, when piercing in the region of joint-like, precisely fitting, or slightly overlapping ends of the shielding foil, these ends may come into the direction of the data conductor, which entails the risk of short-circuits. On the other hand, larger areas and / or multiple overlaps make it difficult to puncture the shield in these areas, so that a tensioning effect can occur which can lead to tearing of the shield and thus to impairment of the shielding effect in the vicinity of the tapping point.

To meet these difficulties and to make the puncture of the shield by the tap contacts as predictable as possible, the shield according to the invention is designed so that it has seams only on the narrow sides of the flat cable, because in these areas naturally no tapping occurs. Conversely, the intended for the tap flat sides are basically free of shielding seams. Exceptions are any seams at the end of the shielding film. The pieces of film are, for example, rectangular with a long longitudinal and a short, matched to the cable circumference transverse edge. They are beaten with the short transverse side around the data conductor, so that their long side approximately coincides with the cable longitudinal direction.

However, the shielding pieces are only of limited length (for example, 300m) so that the length of the cable may well exceed that of the shielding foil. Thus, although the flat side of the flat cable may have such end seams at the end of the shield (i.e., at the transverse or face side of the foil pieces), there are no other seams not caused by the material end of the shield. This type of shielding is achieved, for example, by virtue of the fact that the at least one pair of data conductors will only fold over once with the shielding material in such a way that their longitudinal edges are guided back towards one another on just one of the two narrow sides and only there is a shielding seam produced (more details on the type of production the flat cable follows below). In contrast to, for example, a continuously wrapped shield having a continuous, winding around the data conductor winding seam, so the present shield has, for example, only one shielding seam on one of the two narrow sides of the cable. If the flat cable has a plurality of data conductor pairs, a separate shield is provided, for example, in accordance with the principles of paired, symmetrical signal transmission for each data conductor pair, which in turn only have seams only on the narrow sides of the flat cable. In addition, a shield surrounding all data conductor pairs can be provided, which also follows the sketched structure with seams along the flat cable narrow sides.

Finally, for a (short-circuit) safe tap, the tap contacts of the connection device are insulated against the shielding to be pierced (partially). The data conductors can be tapped with the connecting device by the tapping contacts pierce the shield in the seamless area of the flat side of the flat cable and establish electrical contact with the data conductors.

According to an optional further development, the flat cable is produced by first encapsulating the at least one pair of data conductors by means of an extrusion process in a first operation, so that they are surrounded by a data conductor embedding. Thus, their relative position to each other is determined by this Datenleitereinbettung. The maintenance of a constant distance between the data conductors is not only important for the possibility of the stripping-free tap, but also affects the attenuation of the signal transmission. The data conductor embedding can for example be made of foamed dielectric, which allows a low dielectric constant and a stable signal transmission.

The next step concerns the assembly of the shield. The shielding foil is wrapped around the data conductor embedding in such a way that a substantially longitudinally extending shielding seam is formed on one of its two narrow sides. Alternatively, in each case two pieces of film can be placed on both flat sides of the Datenleitereinbettung whose longitudinal edges then meet each other on the narrow sides, so that on each of the two narrow sides a shielding seam is formed. The detailed design of the shielding seams is irrelevant. For example, the ends may be laid flat against each other and adhered to the data conductor embedding, or they may be overlapped, with or without struck back on each other and glued or welded together. It can also be glued to the entire shielding film on the Datenleitereinbettung. It is also possible to apply several layers of film nach- and one above the other, depending on the desired thickness of the shield. The seams can then be arranged, for example, at each position on the same narrow side or approximately always alternately from layer to layer. However, it is advantageous to provide only one layer in order to ensure that the shielding pierces as well as possible. The thickness of this one layer can be varied depending on the shielding strength to be achieved.

The film pieces, as already indicated above, each have a certain length, for example, 300 meters. If the flat cable is longer than the length of the film pieces, the first piece of film wrapped around the data conductor embedding closes or, if appropriate, several further pieces of film. These are struck around the data conductor embedding analogously to the first piece, so that in turn the lateral shielding seam is formed on the narrow side of the data conductor embedding (or possibly seams on both narrow sides). By this juxtaposition also create end seams as a compound of several pieces of film. These end seams each run around the data conductor embedding around, are also on the flat sides in the areas of potential tap. If the cable length is equal to the length of a shielding film piece, or if the cable is even shorter, then the problem of the end seams does not arise. The flat sides are then completely free of any seams.

In a final operation, the data conductor embedding thus shielded is still surrounded by a protective jacket. This can also be done by an extrusion process. The protective jacket is used to isolate the shielding to the outside and the protection against harmful external influences, for example. Mechanical, chemical o.a. Art.

In a further optional embodiment, a film of an aluminum alloy is used as the material for the shielding. Alternatively, a wire mesh can be used. The thickness and the specific nature of the alloy or the wire mesh depend on the desired shielding strength. The film or the wire mesh are laminated to increase the tear resistance with a plastic film. The aluminum side of the shielding foil lies on the side facing the data-conductor embedding, while the plastic-coated side is oriented outwards. In order to connect the two ends in the region of the shielding seam on the narrow side of the flat cable with each other electrically, one end can be folded back by a certain length during manufacture, so that in this folded-back part shows the metal side to the outside. The other end can then be overlapped on the struck end.

According to an optional further development, the shield is formed on a specific length of the flat cable from a single piece of film. Accordingly, there is only one shielding seam on one of the two narrow sides of the flat cable and no end seams on this longitudinal section. By way of example, this could be a longitudinal section of 300 meters. In another optional development, the shield is formed of a plurality of juxtaposed pieces of film, which are connected to each other by means of end seams for the purpose of continuous shielding. For example, over a length of about 900 meters three pieces of film could be strung together a 300 meters may be, which overlap in the region of the two end seams between the first and second and the second and third pieces of film by a few millimeters or centimeters. On the outer jacket, a marking of these end seams may be provided, so that the installer is given the opportunity not to tap the flat cable in the region of these end seams. Finally, in a further optional development, the entire shield of the flat cable is in one piece, so that it has only one shielding seam on a narrow side and no end seams.

In an optional development of the sentence, the flat cable is designed as a hybrid cable. In addition to the at least one data conductor pair, it has current conductors. The latter run like the data conductors untwisted and substantially parallel to each other in the flat plane of the flat cable, so that they can be tapped by means of the connecting device. The conductors can be low, medium or heavy current conductors. The surrounding with the shield data conductor embedding is embedded together with the individual conductors in a common jacket, which determines their position in the flat cable and gives it its outer shape. The connection device in turn is adapted to the flat cable. It also has tapping contacts for the current conductors. In such a hybrid cable the data conductor shielding is of particular importance, because with the current conductors one of the possible sources of electromagnetic interference runs in the immediate vicinity of the data conductors. In a special optional development of the hybrid flat cable, it has three three-phase conductors, a protective conductor and a neutral conductor and a pair of data conductors.

In order to ensure a safe installation, in some optional developments, the outer geometry of both phrases continue to match each other so that the connection device can be placed without confusion on the flat cable. This is for example in the aforementioned flat cables with three three-phase conductors of importance if only one of the three-phase three phases is to be tapped for installation. The outer geometry of the flat cable (so-called coding) and the complementary outer shape of the connection device (for example in the form of a flat cable receiver) are, for example, asymmetrically designed such that the connection device for tapping the flat cable only in a defined orientation, but can not be placed in a rotated by 180 ° orientation. Thus, an accidental incorrect placement of the connection device is prevented and ensures proper tapping.

In the installed, ie tapped state of the inventive set forms an electrical installation device. For example, a typical installation procedure might look like this: The flat cable is laid to make the installation in accordance with the particular space conditions. Before this actual installation will be regularly perform the installation of cable routes, such as the establishment of line routes, shafts, channels or other cavities. This also includes, depending on the type of installation, the assembly of distribution and control boxes and / or cans. After laying the flat cable, e.g. As part of a building installation between a central distribution box and an access box or the like, then the at least one connection device can be placed at a desired location of the continuous flat cable. Then the tapping process is carried out, depending on the specific design of the connecting device, for example by screwing in the tapping contacts in the form of contact screws or a force acting (directly or indirectly) on contacts in the form of tapping mandrels or -. The tap contacts of the connection device penetrate the outer protective sheath, the shielding in the region of the selected seamless flat side of the flat cable, the data conductor embedding and the core insulation until they contact the data conductor strands.

It is now possible to connect even more connection devices to other positions of the continuous flat cable. Furthermore, one or more devices, for example sensors or actuators, can be connected to the contacted connection device (s).

Brief description of the pictures

Fig. 1

einen schematischen Querschnitt des Satzes aus Anschlussvorrichtung und Flachkabel mit einer Datenleiterabschirmung gemäß einem ersten Ausführungsbeispiel,

Fig. 2

einen Querschnitt des Satzes aus Fig. 1, wobei das Flachkabel zusätzlich Stromleiter umfasst,

Fig. 3

einen Querschnitt des Satzes aus Fig. 2 mit auf das Flachkabel aufgesetzter Anschlussvorrichtung,

Fig. 4

einen Querschnitt des Satzes aus Fig. 3 im angezapften Zustand, d.h. der einsatzbereiten Installationsvorrichtung,

Fig. 5

einen vergrößerten Querschnitt der Installationsvorrichtung aus Fig. 4 mit durchstochener Abschirmung,

Fig. 6

eine Querschnittsansicht einer Abschirmung gemäß einem zweiten Ausführungsbeispiel,

Fig. 7

eine perspektische Ansicht des Flachkabels gemäß dem zweiten Ausführungsbeispiel,

Fig. 8

eine Draufsicht auf die Abschirmung auf einer Flachseite eines Längsabschnittes des Flachkabels, in dessen Bereich die Abschirmung eine Endnaht aufweist,

Fig. 9

eine Draufsicht auf die Abschirmung auf einer Flachseite des Flachkabels ohne Endnaht.

Various embodiments of the invention will now be described by way of example with reference to the accompanying drawings. Show:

Fig. 1

a schematic cross section of the set of connecting device and flat cable with a data conductor shield according to a first embodiment,

Fig. 2

a cross-section of the sentence Fig. 1 in which the flat cable additionally comprises current conductors,

Fig. 3

a cross-section of the sentence Fig. 2 with attached to the flat cable connection device,

Fig. 4

a cross-section of the sentence Fig. 3 in the tapped state, ie the ready-to-use installation device,

Fig. 5

an enlarged cross-section of the installation device Fig. 4 with pierced shield,

Fig. 6

a cross-sectional view of a shield according to a second embodiment,

Fig. 7

a perspective view of the flat cable according to the second embodiment,

Fig. 8

a plan view of the shield on a flat side of a longitudinal portion of the flat cable, in the region of the shield has an end seam,

Fig. 9

a plan view of the shield on a flat side of the flat cable without Endnaht.

Detailed description of the embodiments

Two exemplary embodiments of the set 1 consisting of a continuous flat cable 3 and a complementary connection device 2 will be described below. The two embodiments differ primarily with regard to the configuration of the shield 17 of the data conductors 12. Thus, in the first exemplary embodiment (FIG. Fig. 1 to 5 ) the two ends of the shielding film 17 are only placed against one another on a narrow side of the flat cable 3, while in the second exemplary embodiment the shielding seam 19 has the form of an overlap ( Fig. 6 and 7 ). In addition, regardless of the specific configuration of the shielding seams 19 on the narrow sides, a flat cable 3 with a plurality of shielding film pieces and end seams 20 (FIG. Fig. 8 ) and a flat cable 3 without end seams ( Fig. 9 ).

In both embodiments, the. Set 1 as parts for producing an electrical installation at least one flat cable 3 and at least one connection device 2. The flat cable 3 comprises a pair of data conductors 12 embedded in a Datenleitereinbettung 16. This is surrounded by a single-layer shield 17, which in turn of a jacket. 5 is enveloped whose outer shape corresponds to a defined coding 8. The connecting device 2 is suitable for this outer shape, that is provided with a coding 8 for the complementary flat cable 3 shaping. The coding 8 ensures that both parts 2 and 3 of the sentence 1 can be assembled only in certain predetermined positions. A (unintentional) confusion during the installation process, for example, a twisted by 180 ° placement of the connection device 2, is thereby prevented.

The coding 8 of the first embodiment is characterized by a cut-off "corner" of the flat cable 3 (FIG. Fig. 1 ). The connecting device 2 is complementary thereto. It has a suitable for the flat cable 3 receptacle 7, which has a cut-to-cut "corner" complementary slope. As a result, the connection device 2 can be placed on the flat cable 3 only in one position ( Fig. 1 ), namely only on the flat side of the flat cable 3 with the cut "corner" (just as well, of course, it is possible to make the flat cable 3 so that either tapping on both flat sides is allowed and still excluded a likelihood of confusion of incorrect attachment of the connection device In the present example, the Fig. 1 This could be done, for example, by "cutting off" the lower right flat cable edge analogously to the upper right edge.).

In a first (sub) variant of the first embodiment, the flat cable 3 has only one data bus 13 (ie, no power part) with a pair of data conductors 12, which are untwisted and parallel to each other. At the connecting device 2, two tap contacts 6 are provided for tapping the two data conductors 12 ( Fig. 1 ). Not only the number, but also the spatial arrangement of the tap contacts 6 is matched to the data conductor 12. By way of example, in the figures, they are designed as contact screws. For this purpose, the connecting device has a corresponding number of threaded sockets 25, which at the same time serve as a guide and through which the screws can be screwed in the direction of the flat cable. Just as well, the contacts could be 6 knife, spike or needle-like, so that they can be pressed down by force in the direction of flat cable 3.

In the first exemplary embodiment, the data conductors 12 are of round cross-section, in each case encased by a core insulation 15 and embedded in a data-conductor embedding 16. The latter is cuboid shaped and coated with the shield 17, which in turn is surrounded by the outer protective jacket 5. The data conductor embedding 16 fulfills the function of spacing and positioning the data conductors 12. The shield 17 is wrapped around the data conductor embedding 16 in such a way that its ends reassemble on the narrow side of the flat cable 3 oriented in the direction of the jacket corner come and are placed against each other, so that a shielding seam 19 is formed which extends substantially in the cable longitudinal direction. The shielding seam 19 is schematically indicated in the figures of the first embodiment as a small gap between the shielding transverse ends. For the purpose of complete shielding, however, the ends should be completely, ie flush, guided back to one another, so that in fact there is no gap. The flat side to be penetrated by the tapping contacts 6 as part of the tapping contact is basically free of any seams, so that the tapping contacts 6 do not penetrate the flat cable 3 in the vicinity of shielding seams 19 in the course of the tapping contact (an exception to this "seam freedom" of the flat side is possibly existing end seams 20 between two in the cable longitudinal direction juxtaposed shielding film pieces, see below).

In the embodiments, the shield 17 is formed on a certain longitudinal portion of the flat cable 3 only of a single aluminum foil. Therefore, the shield has a seam only on one of the two narrow sides of the flat cable 3. Alternatively, it could also be formed on such a cable length piece from two aluminum foil pieces, which are each applied to a flat side and then folded around on both narrow sides, so that two shielding seams 19, respectively along two narrow sides of the flat cable 3, are present.

As the name - aluminum foil - makes clear, the shield 17 is made of an aluminum alloy. To increase its strength against possible tearing the aluminum foil 17 is laminated with a plastic film. Usually, the film 17 with the aluminum side 17a lying inside and the plastic-coated side 17b lying outside about the Datenleitereinbettung 16 around. The manner of attachment of the aluminum foil 17 on the Datenleitereinbettung 16 is of minor importance. It may, for example, be glued to the bedding 16 with the aid of an adhesive which is suitable for an adhesive bond between metal and plastic surfaces. The adhesive bond does not necessarily have to extend equally around the entire outer surface of the data conductor embedding 16. For example, it may also be sufficient to apply the foil 17 only on the narrow side with the shielding seam 19 stick while it rests on the other three sides of the Datenleitereinbettung 16 only under train.

In a second (sub) variant of the first exemplary embodiment, the flat cable 3 is designed as a hybrid cable and, in addition to the data bus 13, comprises a current part 14 (FIG. Fig. 2 to 4 ). Namely, three three-phase conductor 4, a protective conductor 9 and a neutral conductor 10 are provided. The individually insulated conductors 4, 9, 10 again run essentially parallel to one another and are embedded together with the "data conductor package" 13 in the common jacket 5. For the conductors 4, 9, 10, the jacket 5 assumes the function of fixing its relative position, similar to the data conductors 12, the data conductor embedding 16, so that they can be tapped with the connection device 2.

The coding 8 of the flat cable 3 is in turn given by the truncated "corner" and also by a rounded, concave recess on a flat side between data conductor part 13 and power part 14. Completely complementary to this, the connection device 2 in the receptacle 7 has a skew connecting device 2 and a round, convex nose on ( Fig. 2 ).

An installation process (based on the second (sub) variant of the first embodiment by way of example in the Fig. 2 to 4 As already mentioned, both parts 2, 3 of the sentence 1 fit in one (or more) defined position (s) ( Fig. 2 ). After laying the flat cable 3, the connecting device 2 is placed at the desired cable longitudinal point in the defined position (in Fig. 3 on the upper, horizontal flat side). It can be provided that the connection device 2 has a locking device, which allows it to be fastened before the actual tapping of the flat cable 3 at the desired cable longitudinal point. Finally, the tapping takes place in that the contact screws 6 assigned to the to-be-taped conductors 4, 9, 10, 12 are moved successively by turning in the direction of the flat cable 3. When tapping a data conductor 12, a screw 6 first penetrates the common jacket 5 until it strikes the shielding film 17. This is then also punctured. In the further course it pierces the Datenleitereinbettung 16 and the wire insulation 15. Finally, it strikes - ideally in the middle - the data conductor strand 12, penetrates into it and splits it ( Fig. 4 ). In order to prevent a complete division of the data conductor 12, the distance that can cover the screws 6 in the context of the pin, structurally limited, for example, by the depth of the screw heads of the contact screws receiving holes in the housing of the connection device. 2

The penetration of the shield 17 by the tapping contact 6 causes a ridge 26 (see enlarged view in FIG Fig. 5 ). Upon impact of a tap contact 6 on the shield 17, the latter is torn open like a hole. With the further penetration of the tap contact 6 into the data conductor embedding 16, the shielding film 17 in the region of the ridge 26 is pulled along by this to a certain extent in the direction of the data conductor 12. Due to the fact that a puncture of the shield 17 does not take place in the region of a shielding seam 19, it is ensured that the ridge 26 only reaches a limited size and does not continue to unravel or tear further. In addition, it is ensured by the thickness of the data conductor embedding 16 and the wire insulation 15 that the shielding film 17 is not drawn in to the data conductor 12. The frayed around the ridge 26 film 17 thus remains within the data conductor embedding 16 and outside the wire insulation 15. A short circuit between the shield 17 and the data conductor 12 is thus excluded.

As an additional measure, the data conductors 12 associated tapping contacts 6 are provided against the shield 17 with a partial insulation 21 ( Fig. 5 ). For a secure production of the electrical contact with the data conductors 12, at least the contact region of the contact screws 6, speaks the tip, not isolated. The insulation 21, for example in the form of a plastic coating, begins above the screw tip and extends along a certain length along the screw shaft, in Fig. 5 completely up to the screw head. Thus, an inadvertent electrical connection between the shield 17 and the data conductor 12 by the tapping contacts 6 and a concomitant short circuit are excluded.

The contacting of the conductors 4, 9, 10 by the corresponding contact screws 6 takes place in an analogous manner. Since no shield 17 is provided here, the partial insulation 21 can be omitted for these contact screws 6. After selecting the current conductor to be contacted 4 (in the in Fig. 2 to 4 For example, when only a single-phase load is to be connected, a phase selection may be necessary, cf. Fig. 4 , where only the phase conductor is tapped left outside), the respective contact screws 6 are screwed. These pierce the jacket 5 and the wire insulation 15 and meet the conductors 4, 9, 10 preferably in the middle, so that they are again split and electrically contacted. After contacting all provided conductors 4, 9, 10, 12, the electrical installation device 28 is ready for use ( Fig. 4 ). Corresponding devices can now be connected to the power and data outlets of the connection device 2 (not shown in the figures).

In the second embodiment of sentence 1 ( Fig. 6 and 7 ) is the longitudinal seam 19 as an overlap, again on one of the narrow sides of the flat cable 3, is formed. The aluminum foil 17 is for this purpose of greater width. The film 17 is plastic laminated again, wherein the coated side 17b is located outside the perspective of the Datenleitereinbettung 16. In order to achieve the advantageous properties of a Faradey cage, not only one transverse end of the shielding film 17 is placed over the other during manufacture, but one end folded back on the narrow side, so that the uncoated, metal side of the film 17 in this area outside lies. The other end is then placed on the folded-back region, so that preferably both transverse ends are flush with each other ( Fig. 6 ). Thus, an electrical contact is made between the transverse ends in the region of the overlapping shielding seam 19. Nevertheless, since each seam causes variations in the quality of the shielding, the shielding seam 19 is again preferably located on the side facing away from the current conductors 4, 9, 10, ie the main interference source.

The second embodiment differs from the above-described first embodiment in two further aspects. On the one hand, the data conductors 12 have no separate individual insulation 15 (see Fig. 7 ), but are directly in the data conductor embedding 16 embedded. As a result, the data bus 13 of the flat cable 3 is characterized by a simpler structure. Due to the direct embedding, a greater accuracy of the relative position of the data conductors 12 in the data conductor embedding 16 can be achieved since the manufacturing tolerances to which the sheath of the data conductor strands 12 are subjected with a single insulation 15 and lead to deviations in the guidance of the strands 12 within the individual insulation 15, be avoided. The accuracy of the tap is thus increased. The isolation of the data conductor 12 to the outside and especially against the shield 17 is taken over by the Datenleitereinbettung 16 with. On the other hand, the flat cable 3 in the second embodiment has a different shape. Thus, the data conductor embedding 16 is now cuboid shaped with rounded edges. Also, the outer geometry, ie the coding 8 of the flat cable another, but still a mistakenly incorrect placement of the connection device 2 (in Fig. 7 not shown) is excluded by asymmetry of the coding 8 in the cable transverse direction.

Preferably, pieces of shielding film 17 as long as possible are used and wrapped around the data conductor embedding 16 in order to avoid unnecessary seams between a plurality of film sections adjoining one another in the cable longitudinal direction. However, such pieces of film are not infinitely long, so that it may well happen that the length of the flat cable 3 exceeds the length of the available film pieces. In this case, it is unavoidable to line up several pieces of film in the cable longitudinal direction, so that end seams 20 are formed at their respective longitudinal ends ( Fig. 8 ). Depending on the type of longitudinal foil ends, these end seams 20 can extend essentially transversely to the cable longitudinal direction or also obliquely thereto. Similar to the seams 19 on the flat cable narrow sides, they are formed in the form of flush terminations or even overlaps. In the case of overlaps, the above-mentioned folding-back technique can also be used for the purpose of continuous shielding.

Even if such end seams 20 can not be avoided with long cable lengths, it is nevertheless desirable that no tapping takes place in these end seam areas 20 or that the installer is informed at least about the position of the end seam sites 20 and even decide whether he wants to tap the flat cable 3 with a connection device 2 in these areas or not. To make this possible, the jacket 5 is marked with a cable marking 27 at the locations of the end seams 20. This can be something like an imprint, a sticker or similar. be formed. Thus, it is now possible to make an offset in the cable longitudinal direction mounting the connection device 2 on the flat cable 3, if necessary.

If the length of the flat cable 3 corresponds to the length of the film pieces 17 or even shorter, end seams 20 can be avoided. The flat sides to be tapped are then completely free of all seams; a marking 27 is therefore also not required ( Fig. 9 ). The manufacturing process of such shorter flat cables 3 can, for example, take place in such a way that flat cables 3 are basically produced in their maximum length, which exceeds the length of the film pieces 17, including the above-mentioned end seams 20 and possibly the markings 27. If shorter flat cables 3 are desired, the end seam areas 20 can be easily cut out.

Claims (11)

1. Set (1) of parts for producing an electrical installation, comprising

   - at least one flat cable (3) and at least one connection apparatus (2) which complements the flat cable (3) and has tapping contacts (6) for tapping the flat cable (3) without stripping the insulation,

   - wherein the flat cable (3) comprises at least one pair of data conductors (12),

   - wherein the data conductors (12) run parallel to one another in an untwisted manner,

   - wherein the data conductors (12) are surrounded by a shielding (17),

   - wherein the tapping contacts (6) are insulated from the shielding (17),

   characterized in that the shielding (17) has seams (19) only on the narrow sides of the flat cable (3), so that no seam (19) runs across the flat sides, apart from an end seam (20), which may be present, at the end of the shielding (17), so that the data conductors (12) can be tapped with piercing of the shielding (17) by the tapping contacts (6), without piercing taking place in the region of a shielding seam (19) in the process.
2. Set (1) according to Claim 1, wherein the flat cable (3) is produced by the at least one pair of data conductors (12) being encapsulated by extrusion with a data conductor embedding (16), and the data conductor embedding (16) is wrapped by the shielding (17) in such a way that a shielding seam (19) is produced on a narrow side of the flat cable (3), and the data conductor embedding which is shielded in this way is encapsulated by extrusion with a jacket (5).
3. Set (1) according to Claim 1 or 2, wherein the shielding (17) comprises a foil which is composed of an aluminium alloy and is laminated with a plastic film.
4. Set (1) according to one of the preceding claims, wherein the shielding (17) is formed from a single piece of foil on a longitudinal section of specific length of the flat cable (3).
5. Set (1) according to one of the preceding claims, wherein the shielding (17) is formed from a plurality of pieces of foil over a specific length of the flat cable (3), the pieces of foil being connected to one another by means of end seams (20) for the purpose of continuous shielding in the longitudinal direction of the cable.
6. Set (1) according to one of Claims 1 to 4, wherein the shielding (17) is formed from one piece of foil over the entire length of the flat cable (3), so that the shielding (17) does not have any end seams (20).
7. Set (1) according to one of the preceding claims, wherein the flat cable (3) is a hybrid cable which, in addition to the data conductors (12), has current conductors (4) which run in an untwisted manner and parallel to one another, wherein the current conductors (4) and the data conductors (12) are jointly surrounded by a jacket (5).
8. Set (1) according to Claim 7, wherein the flat cable (3) has three three-phase current conductors (4), a protective conductor (9) and a neutral conductor (10) and two data conductors (12).
9. Set (1) according to one of the preceding claims, wherein the flat cable (3) and connection apparatus (2) have a coding (8), so that the flat cable (3) does not exhibit any symmetry relative to a 180° rotation of the connection apparatus (2) during assembly with the flat cable (3) by means of the coding (8), and therefore can be tapped by the connection apparatus (2) without mix-ups.
10. Electrical installation produced using a set according to one of Claims 1-9, comprising

    - at least one flat cable (3) and at least one connection apparatus (2) which complements the flat cable (3) and has tapping contacts (6) for tapping the flat cable (3) without stripping the insulation,

    - wherein the flat cable (3) comprises at least one pair of data conductors (12),

    - wherein the data conductors (12) run parallel to one another in an untwisted manner,

    - wherein the data conductors (12) are surrounded by a shielding (17) which has seams (19) only on the narrow sides of the flat cable (3), so that no shielding seam (19) runs across the flat sides, apart from an end seam (20), which may be present, at the end of the shielding (17),

    - wherein the tapping contacts (6) are insulated from the shielding (17), so that the data conductors (12) are tapped with piercing of the shielding (17) by the tapping contacts (6), without piercing taking place in the region of a shielding seam (19) in the process.
11. Method for producing an electrical installation using a set according to one of Claims 1-9, comprising

    - mounting the connection apparatus (2) onto the flat cable (3),

    - tapping the data conductors (12) with the aid of the tapping contacts (6) with piercing of the shielding (17), so that, owing to the arrangement of the seams (19) of the shielding (17) only at the ends, tapping is performed without piercing in the region of a shielding seam.

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