DE9305843U1 - Tap-off or junction box for busbars in low-voltage busbar trunking systems - Google Patents

Description

Klöckner-Moeller GmbH -1- 0 309 GM

1 February 1993

Outlet or connection box for busbars in low-voltage busbar distributors.

The invention relates to a tap-off box according to the preamble of claim 1.

In energy distribution, busbar systems, also known as busbar distributors, have long been known and proven for the transport and distribution of electrical energy.

Typical tasks of these rail systems can be the connection from a transformer via a main distribution board to the sub-distribution board, the supply of high-rise floors or the supply of large consumers.

Busbar distributors with rigid busbars, usually flat busbars, are used particularly in factories where power consumers have to be changed frequently.

The current branch is implemented using junction boxes, which have a contact element for the electrical connection of the busbars.

The junction boxes have switching or protective devices or even fuses that are connected between the branch lines; in particular, NH fuses with corresponding contact and protective housings are used for this purpose, also known as NH fuse switch disconnectors.

If such tap-off boxes are to be suitable for high currents, the constructions must be relatively stable in relation to the high weight, short-circuit forces and arc faults. In addition, such tap-off boxes should not be removable under load and measures must be taken to ensure that no live parts can be touched. Furthermore, commissioning should not be possible if the tap-off box is not securely fastened to the busbar channel.

Klöckner-Moeller GmbH -2- * 0 309 GM

1 February 1993

Such protective and fastening devices must sometimes be structurally modified or arranged accordingly depending on the size of the tap-off box or the width of the busbar channel. In some cases, these are only suitable for one size. At the very least, however, a correspondingly large number of different designs result, which is counteracting inexpensive production and storage.

Known junction boxes also have the disadvantage that the interior is difficult to access during assembly, especially if cables or other parts are already in place. Furthermore, completely different outlet boxes are required for different widths of rail ducts. Likewise, a larger or smaller outlet box requires a specially adapted base assembly. This results in a large number of different types with the associated disadvantages, such as storage, expensive production, etc.

A tap-off box of the type mentioned above is shown in US 29 70 245. As can be seen in Fig. 3, the tap-off box consists of a trough-shaped base, with the fastening means arranged on the side walls and thus only suitable for one width of the rail channel. As can also be easily seen from the figure, the interior is only accessible from above and is therefore difficult to access.

EP 0 168 310 Al shows another tap-off box. This consists of a first compartment with connecting rails and a second compartment, the connection compartment, with a partition wall in between. However, only one housing size is shown there.

Another outlet box with a metal housing is shown in EP 0 435 123 Al and EP 0 437 758 Al. This has a sliding cover underneath a hinged cover, which covers either an equipment compartment or a connection compartment. The basic shape here is also tub-shaped

Klöckner-Moeller GmbH

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and the fixings are fixed to the underside of the floor. Although such a tap-off box can be wider or have a different degree of protection, different designs are required in each case. The spacing of the fixings can in principle be changed in order to be mounted on a different busbar channel with a different width, this makes it difficult to use devices that prevent commissioning when the tap-off box is loose.

If a high level of operating safety is required, protective and locking devices must be installed in the tap-off box, which must be adapted to the respective design depending on the size and type of tap-off box, which then makes the tap-off boxes correspondingly expensive.

If, for example, a larger or wider equipment compartment is required in a design according to DE-AS 11 31 769, significant design difficulties arise with regard to the locking and protective devices. Another disadvantage of DE-AS 11 31 769 is that the use of currently commercially available NH fuse housings is not provided for.

The object of the invention is therefore to create an outlet or connection box according to the preamble of claim 1, which is suitable for different widths of the rail channel or different widths of the outlet box, furthermore, the production should be carried out using as many identical parts as possible for different designs and the interior should be easily accessible during assembly, whereby the outlet box should be suitable for the installation of fastening and protective devices and high currents.

Klöckner-Moeller GmbH

'· *· 0 309 GM 1 February 1993

The object of the invention is achieved by the characterizing features of claim 1, while particularly advantageous developments of the invention are characterized in the subclaims.

The invention reduces the number of different parts, which simplifies production and provides advantages in terms of storage. The open sides of the base part result in a particularly assembly-friendly design of the connection or outlet box.

It is particularly advantageous if the base part is a U-shaped sheet metal section with downwardly bent legs and on each side there is a narrow downwardly bent strip for fastening either directly to the hood or with a cover profile, whereby the cover profile is then also U-shaped and its legs also point downwards, because on the one hand a flat floor is created from above and on the other hand the parts can be easily and securely riveted or screwed together.

Because sections connected to fastening elements are continued in one piece below the bar to the right and left of a connecting bolt of the rail channel, which is used to make contact, with the fastening elements being arranged within the sections, the fastening elements are automatically arranged at the correct distance from one another and at the same time are inaccessible from the outside.

If the hood has a sliding cover that completely covers either the equipment compartment or the connection compartment, the partition wall is fastened directly to the base part, the fastening elements are connected to a locking device for the sliding cover and the locking device is only fastened to the base part and the partition wall, then commissioning is only possible if the tap-off box is properly

Klöckner-Moeller GmbH

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is attached to the rail channel without the locking device being affected when replacing a different cover, for example with a different protection class or a different size, or locking parts having to be screwed on or laboriously dismantled.

It is particularly advantageous if the locking device consists of a locking and handling rod attached to the partition wall, which can be moved parallel to the partition wall against two springs, and an actuating part for the fastening elements arranged below the base part and perpendicular to the partition wall, and that the locking and handling rod can be immersed in a recess in the actuating part, because effective locking is achieved with simple pre-assembly of the locking device, i.e. before the partition wall has been connected to the base part.

It is also particularly advantageous if the hood has an intermediate part in which the sliding cover is arranged, that a protective device is present in the intermediate part above the equipment compartment, that NH fuses with an NH fuse housing are present in the equipment compartment, that the protective device consists of a sensing part that can be immersed in the NH fuse housing and an edge that blocks the sliding cover in the immersion position and that the protective device is not connected to the base group or the NH fuse housing, because the hood can then easily be provided with another base group or another, e.g. smaller, base part, without functions related to the protective device, such as releasing the connection compartment only when NH fuses are missing, being affected.

To ensure that coding elements are always adapted to the correct width of the rail channel, they are arranged within the base section adjacent to the strip.

Klöckner-Moeller GmbH

·· ·· 0 309 GM 1 February 1993

If the sections or the base part are provided with reinforcement parts near the front sides of the tap-off box, which together with the sections form an L-shaped angle, then an increase in rigidity is achieved in a simple way, whereby the fastening elements can be arranged within the L-shaped angle so that they are inaccessible from the front sides.

It is also advantageous if the reinforcement parts in the area of the base each form a spacer edge arranged at right angles, which keeps the outlet or connection box at a distance from the rail channel, and that the reinforcement parts in the area of the sections form guide edges with bevels, which guide the outlet or connection box when it is placed on the rail channel, because locking or operating parts can easily be arranged in the gap between the outlet box and the rail channel and because a protective device that contracts like a bellows can be arranged in the gap, with which the outlet box can be placed even under tension without additional spacers or the like having to be arranged and because additional guide parts can be saved.

It is particularly advantageous if the partition wall has a greater width than the floor section, because then, if the tap-off box always has the same width, only the use of cover profiles in the floor area is necessary if a smaller rail system is used.

It is also advantageous if the partition wall is at most the same width as the base part, the hood is wider than the base part and the level between the partition wall and the hood is covered by cover plates or filler profiles. This allows a wider outlet box to be used using a standard base group.

Klöckner-Moeller GmbH

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A particularly good way of fastening is when the partition is attached to the base part using screws, connected to the hood on the sides and top using rivets, and the base part is connected to the hood on the sides using rivet connections and on the front sides using screws. This makes it possible and advantageous to connect the base part and the partition only after painting and after fitting the locking parts, and on the other hand the rivet connections make it impossible to remove the parts at the installation site, with the screw connection simultaneously ensuring the earthing of the entire tap-off box.

If the sliding lid is U-shaped with downwardly angled legs and is made in one piece on the legs and provided with guide strips that continue parallel to the base, then it is not only easy to manufacture from one section, but also requires little space, which is suitable for a handle to be formed from the material.

It is also particularly advantageous if a box or holder for tools, such as insulated gripping tools or pliers for insulating material pieces, is detachably arranged in the intermediate part above the connection compartment, whereby this is arranged between the legs of the sliding cover and is covered by the sliding cover when the sliding cover is above the connection compartment, because a space-saving arrangement of the tools is achieved and the tools are only accessible when the sliding cover has been moved in a fuse-free device compartment, i.e. the connection compartment is no longer under voltage.

The invention, further refinements and improvements of the invention and further advantages will be described and explained in more detail with reference to the drawing, in which an embodiment is shown.

Klöckner-Moeller GmbH -8- &Oacgr; 309 GM

1 February 1993

It shows:

Fig. 1 is a perspective view of the tap-off box assembled,

Fig. 2 a perspective view of the floor assembly with superstructures,

Fig. 3 a perspective view of the base part,

Fig. 4 an exploded, perspective view of the base part with cover and reinforcement profiles in reverse position,

Fig. 5 is a partially exploded perspective view of the base part with fastening elements,

Fig. 6 is a perspective view of the locking device with a rail channel,

Fig. 7 is a perspective view of the hood with a partially expanded protective device,

Fig. 8 is an exploded perspective view of the intermediate part and the cover,

Fig. 9 a schematic diagram of a tap-off box mounted on a narrow rail channel,

Fig. 10 a schematic diagram of a tap-off box mounted on a wide rail channel,

Fig. 11 a schematic diagram of a narrow tap-off box on a rail channel,

Fig. 12 a schematic diagram of a wide tap-off box on a rail channel,

Klöckner-Moeller GmbH -9- 0 309 GM

1 February 1993

Fig. 13 a schematic diagram of a wide tap-off box on a rail channel in an exploded view and

Fig. 14 is a sectional view of the tap-off box in Fig. 13.

Fig. 16 a schematic diagram of another embodiment of a wide outlet box on a rail channel,

Klöckner-Moeller GmbH -10- 0 309 GM

1 February 1993

As shown in Fig. 1, the tap-off box 1 consists of a base group (Fig. 2 and 5) with open sides and a hood 16 (Fig. 7) covering the base group 2, which is placed on the base group 2 and fastened to it.

The tap-off box 1 is further divided into an equipment compartment 14 and a connection compartment 15, whereby the compartments are separated by a partition wall 13 and are accessible through a lockable, hinged cover 9 and a sliding cover 18 (Fig. 8).

A base part 2 of the base group consists of a U-shaped sheet metal section, as can be seen in Fig. 4. Parts of the legs of the sheet metal section are open or recessed, so that a total of four sections 10 facing downwards or towards the cover 9 are present, which are arranged to the right and left around the rail connecting bolt 47 (Fig. 6) in such a way that it is easily accessible. The base part 2 has narrow strips 27 bent downwards at right angles, to which the sections 10 (Fig. 8) are connected in one piece.

The partition wall 13 is attached to the base part 2 by means of screws, which divides the outlet box 1 into the equipment compartment 14 and the connection compartment 15. The partition wall 13 has a cutout 31 in the middle, as can be seen in Fig. 1. There, the connection rails 32 pass from the equipment compartment 14 into the connection compartment 15. The connection rails 32 are supported by an insulating plate which is attached to the partition wall 13.

The base part 2 is extended with cover profiles 8 as filling and adapter parts if, as in Fig. 1, the case occurs that the base part 2 is smaller or narrower than the cover 16 of the outlet box 1. The cover 16 (Fig. 7) can

Klöckner-Moeller GmbH

0 309 GM 1 February 1993

on a larger base part 2 than that shown in Fig. 1. In this case, either smaller cover profiles 8 or none at all are used.

The cover profiles 8 are U-shaped, with the legs of the cover profiles 8 having the same dimensions as the strips 27 of the sheet metal section 25, so that they can be easily connected to one another by means of screws or rivets.

On the side walls of the hood 16, openings 41, 42 are provided on the connection compartment side for the cable grommets 43 of the outgoing cables, which can be used optionally or can also be covered, as shown in Figures 1 and 8.

As shown in Figure 4, a U-shaped sheet metal section 25 forms the outlet box base. As mentioned, the legs 10 are only formed over part of the length.
Reinforcing parts 26 are provided on the front sides in connection with the legs 10.

The reinforcement parts 26 each form a continuous U-shaped edge at a right angle within the base part. In the area of the sections 10, the edges form L-shaped angles, whereby fastening elements 4, which are intended for fastening the outlet box 1 to the rail channel 3, can be arranged within these angles in a way that is difficult to access from the front sides.

The edge below the floor also serves as spacer edges 54, which keep the outlet box 1 at a distance from the rail channel, whereby cover devices 7 (Fig. 3) can be arranged in the space between them, with which a connection is also possible under voltage. In contrast, the edges in the area of the sections 10 are provided as guide edges 55 with bevels 56.

In the strip 27, which is bent at right angles to the floor, there are slots 28 through which a handle 29 of an actuating part

Klöckner-Moeller GmbH -12- 0*309 GM

1 February 1993

24. The slots are also present in the adapter profiles 8.

Coding elements 6 are also attached to the underside of the base group 2 to ensure correct assignment of the tap-off box and tap-off point. These are supported on the bar 26.

The parts are provided with both screw and rivet connections.

The partition wall 13 is here fastened to the base part 2 by means of screws, connected to the hood 16 on the sides and at the top by means of rivets, and the base part 2 is connected to the hood 16 on the sides by means of rivet connections and on the front sides by means of screws.

Rotatable U-shaped fastening brackets serve as fastening elements 4 for fastening the outlet box 1 to the rail channel 3, which are pivoted into a likewise U-shaped recess 11 of the rail housing by means of an actuating part 12, as shown in Figures 5 and 6.

The fastening brackets are assigned to the base group 2, as is a locking device 17, which corresponds to a sliding cover 18 assigned to the hood 16 or can engage behind it to lock it. The sliding cover 18 covers either the device compartment 14 or the connection compartment 15, whereby the locking device 17 with a protective device 40 works in such a way that, on the one hand, the connection compartment is only accessible if there are no NH fuses 19 in the device compartment 14 and, on the other hand, it is not possible to put the tap-off box 1 into operation if the fastening brackets 4 have not been swung in or the tap-off box 1 is not properly and firmly connected to the busbar channel 3.

Furthermore, the fastening elements 4 or fastening brackets

6 *

Klöckner-Moeller GmbH -13- &Oacgr; 309 GM

1 February 1993

at one end directly supported on the floor of the tap-off box and at the other end on a bearing bracket 21 which is connected to a section 10.

The locking of the sliding cover 18 is effected on each side by an L-shaped locking and handling rod 20 of the locking device 17, which is fastened to the partition wall 13 and which corresponds to the sliding cover 18 independently of the width of the floor assembly 2 and the size of the hood 16, whereby the locking device 17 does not restrict the choice of the floor assembly 2 or the hood 16.

The locking and handling rod 20 of the locking device 17 can only be inserted into a cutout 52 of the actuating part 24 if the fastening brackets are arranged in the fastening position, whereby only then can the connection compartment 15 be covered by the sliding cover 18 and the device compartment 14 be released for the insertion of NH fuses by a protective device 40 explained below.

The pivoting movement of the fastening bracket 4 is achieved by an actuating part 24, which engages an eccentrically arranged bearing point 22 of the fastening bracket 4. The actuating part 24 works with the locking and handling rod 20. Both the actuating part 24 and the locking and handling rod 20 are independent of the hood 16, i.e. they are not connected to the hood.

As shown in Figure 3, a protective cover 30 can be arranged around the contact point 29, which is folded together when the tap-off box 1 is put on.

The base group 2 shown in Fig. 2 basically forms an outlet with protection class IP 00. This contains contact, locking and coding functions but no measures for

Klöckner-Moeller GmbH

0 309 GM 1 February 1993

a higher degree of protection. The degree of protection is determined by the design of the hood 16.

The hood 16 consists of a cover 9, which is connected to an intermediate part 35 in a hinge-like manner, i.e. by means of hinges 34, as can be seen in Fig. 8. The intermediate part 35 is connected to L-shaped profiles 36, which are connected to further profiles 37 (Fig. 1) with the side walls 37 and 38 by rivets or screws.

In the intermediate part 35 of the hood 16 there is the sliding cover 18 which, as can be seen in Fig. 6, is not connected to the locking device 17, but only blocks or engages behind the upper edge of the sliding cover 18 by protruding beyond it, whereby the hood can be designed almost independently of the floor assembly 2.
As already explained, the sliding cover 18 continues to act with the protective device 40, which only releases the sliding cover 18 when no NH fuses 19 or other bridging parts are present in the NH fuse housing.

The protective device 40 consists of a sensing part 49 with insulated sensing fingers that can be rotated and immersed in the NH fuse housing or in the NH fuse receiving space, whereby the sensing part is attached to a blocking part that is rotatably attached to the hood 16. The blocking part has an edge 50 that blocks the sliding cover when NH fuses 19 are inserted, as can be seen in Fig. 8.

To limit the movement of the sliding cover 18, there are also lugs 57 (Fig. 1) which can be bent into the guide groove.

As can be clearly seen in Figure 6, the sliding cover 18 is U-shaped with legs angled downwards and has guide strips on the legs that are integral and continue parallel to the base part 2.

Klöckner-Moeller GmbH

0 309 GM 1 February 1993

A box 53 for tools, such as insulated gripping tools or pliers for insulating pieces, which is shown in Figure 1, is detachably arranged in the intermediate part above the connection space 15, wherein this is arranged between the legs of the sliding cover 18 and is covered by the sliding cover 18 when the sliding cover 18 is located above the connection space 15.

The tap-off box 1 is made compact by the arrangement and shape of the sliding cover 18.

Different embodiments are explained using schematic diagrams or Figures 9 to 14, taking into account busbar housings or busbar channels of different widths and tap-off boxes of different widths.

In Fig. 9, a tap-off box la is shown with a sliding cover 18a located in the intermediate part 35a. The rail channel 3a here contains four busbars 44.
The floor assembly 2a is adapted to the width of the rail channel 3a. The partition wall 13a is wider than the floor assembly 2a, as is the hood 16a. The gap that would otherwise exist between the hood 16a and the floor assembly 2a is filled by adapter profiles 8a.

The cover 16a can, for example, produce a tap-off box for protection class IP 30. If, on the other hand, the tap-off box is to be designed for a higher protection class, then only a corresponding cover 16a must be used, whereby the base group 2a with the locking device 17, i.e. fastening bracket 4 and associated elements, remain unchanged. The parts relevant to contact safety, such as sliding cover 35a or protective devices 40, are assigned to the cover 16a.

As shown in Fig. 10, the hood 16a shown in Fig. 10 can be used for a rail duct 3b with seven busbars 44, i.e. also protective devices 40 and sliding covers 35a

Klöckner-Moeller GmbH

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1 February 1993

can be used unchanged.

The adaptation is achieved by a correspondingly wider floor group 2b, whereby in this example no adapter profiles

2a are required.

For the seven-rail system, different electrical structures, such as devices or connectors 45 (Fig.2) are required than for the four-rail system, so the electrical structures are assigned to the floor group.

The electrical structures are arranged on the floor assembly, as can be seen particularly in Figure 2.

As Figures 11 and 12 show, a wider outlet box can be used without difficulty with the same floor group 2a. The partition wall is adapted to the width of the box using additional filling profiles 46. The filling profiles 46 are U-shaped, i.e. similar to the adapter profiles 8.

In Fig. 13, the hood 16c is shown pulled apart. All parts that are connected to the base group 2 or the partition wall 13 can also be used unchanged for the wider outlet box (Fig. 12).

Instead of the hood, as shown in Figure 12, a U-shaped hood with a base leg resting on the base part 2 and side legs pointing upwards can be arranged on the base part 2, i.e. without filling profiles 46, as shown in Figure 15.

Claims (15)

Protection claims 1. Outgoing or connection box for busbars in low-voltage busbar distributors, with a metal housing which is divided into an equipment compartment and a connection compartment by a partition wall, characterized in that the outgoing or connection box (1) consists of a base part (2) which is open at the sides before assembly (Fig. 3) and which is adapted to the width of the busbar channel (3) or the number of busbars in the busbar channel (3) (Fig. 9, Fig. 10), that the outgoing or connection box (1) consists of a hood (16) covering the open sides of the base part (2) (Fig. 7), which is at least as wide as the base group (2) (Fig. 10, Fig. 11) and which has a protection type and width corresponding to the requirements and that, if the hood (16) is wider than the base part (2), cover profiles (8) are arranged between the hood (16) and the base part (2). (Fig. 1, Fig. 4, Fig. 9, Fig. 12). 2. Outlet or connection box according to claim 1, characterized in that the base part (2) is a U-shaped sheet metal section (Fig. 4) with downwardly bent legs and on each side there is a downwardly bent narrow strip (27) for fastening either directly to the hood (16) or to a cover profile (8), in which case the cover profile (8) is also U-shaped and its legs also point downwards. 3. Outlet or connection box according to claim 1 or 2, Klöckner-Moeller GmbH -18- 0*309 GM 1 February 1993 characterized in that underneath the strip (27) to the right and left of a connecting bolt (47) of the rail channel (3), which serves to establish contact, sections (10) are continued in one piece, which are connected to fastening elements (4), the fastening elements (4) being arranged within the sections (10). 4. Outlet or connection box according to one of the preceding claims, characterized in that the hood (16) has a sliding cover (18) that completely covers either the equipment compartment (14) or the connection compartment (15) (Fig. 1), that the partition wall (13) is attached directly to the base part (2) (Fig. 2), that the fastening elements (4) are connected to a locking device (17) for the sliding cover (18) and that the locking device (17) is attached only to the base part (2) and the partition wall (13). 5. Outlet or connection box according to claim 4, that the Locking device (17) consisting of a (13) fixed against two springs (51) and movable parallel to the partition wall (13) and a locking and handling rod (20) below the base part (2) and an actuating part (24) arranged perpendicular to the partition wall for the fastening elements (4) and that the locking and handling rod (20) can be immersed in a recess (52) of the actuating part (24). 6. Outlet or connection box according to one of the preceding claims, characterized in that the hood (16) has an intermediate part (35.) in which the sliding cover (18) is arranged, that in the intermediate part (35) and above the equipment compartment (14) there is a protective device (40), that in the equipment compartment (14) NH fuses (19) with · Klöckner-Moeller GmbH 0 309 GM 1 February 1993 an NH fuse housing, that the protective device (40) consists of a scanning part (49) that can be immersed in the NH fuse housing and an edge (50) that blocks the sliding cover (18) in the immersion position and the protective device is not connected to the base group or the NH fuse housing 7. Outlet or connection box according to one of the preceding claims, characterized in that coding elements (6) are arranged within the base part (2) adjacent to the strip (27). 8. Outlet or connection box according to one of the preceding claims, characterized in that in the vicinity of the end faces of the outlet or connection box (1) the sections (10) or the base part (2) are provided with reinforcing parts (26) each made of a bent sheet metal section (Fig. 4) which together with the sections (10) form an L-shaped angle. 9. Outlet or connection box according to claim 8, characterized in that the reinforcing parts (26) in the area of the base each form a spacer edge (54 a) arranged at right angles, which keeps the outlet or connection box (1) at a distance from the rail channel (3) and that the reinforcing parts (26) in the area of the sections (10) form guide edges (55) with bevels (56) which guide the outlet or connection box (1) when it is placed on the rail channel (3). 10. Outlet or connection box according to one of the preceding claims, characterized in that the partition wall (13) has a greater width than the base part (2) (Fig. 9). Klöckner-Moeller GmbH -20- 0 *309 GM 1 February 1993 11. Outlet or connection box according to one of the preceding claims, characterized in that the partition wall (13) has at most the same width as the base part (2), the hood (16) is wider than the base part (2) and the plane between the partition wall (13) and the hood (16) is covered by cover plates or filling profiles (46). 12. Outlet or connection box according to one of the preceding claims, characterized in that the partition wall (13) is fastened to the base part (2) by means of screws, is connected to the hood (16) on the sides and at the top by means of rivets, and that the base part (2) is connected to the hood (16) on the sides by means of rivet connections and on the front sides by screws. 13. Outlet or connection box according to one of the preceding claims, characterized in that the sliding cover (18) U-shaped with downwardly angled legs and with the legs integral and parallel to the base part (2) continuous guide rails. 14. Outlet or connection box according to claim 13, characterized in that a box (53) or holder for tools, such as insulated gripping tools or pliers for insulating material pieces, is detachably arranged in the intermediate part above the connection space, wherein this is arranged between the legs of the sliding cover (18) and is covered by the sliding cover (18) when the sliding cover (18) is located above the connection space (15). 15. Outlet or connection box according to one of the preceding claims, characterized in that a U-shaped hood with a base leg resting on the base part (2) and side legs pointing upwards is arranged on the base part (2).