DE444071C - Junction box for electrical risers - Google Patents

Description

The aim of the invention is to expand the safety systems for electrical risers to normalize in residential and commercial buildings, to control against congestion make it easier to prevent unauthorized power consumption and reduce the risk of fire if they occur Eliminate short circuits.

The expansion of the safety systems for riser lines has so far been carried out using the

ίο well-known fuse elements that are used for different Amperages are produced. Usually used as a protective box for these fuses Wooden box that protects the systems against damage and unauthorized access should protect, and for this purpose after the commissioning of the system by the electricity companies have been sealed.

However, these boxes do not offer any protection against the risk of fire. standing short circuits cause the fire to spread quickly. the Further disadvantages of such a protected system are that they are not expanded only a complete renovation, but also a renewal of the protective clothing is required becomes, as the disguise to protect the

extended system is no longer sufficient and must be replaced by a new one.

For the production of larger switchgear, e.g. B. in intercity centers and factories, Fuse elements built into cast iron housings are also produced. The usage Such encapsulated fuse elements would, however, not be used for the expansion of fuse systems for riser lines suitable, as they are manufactured in different sizes for the various currents, which do not allow any number of them to be arranged in a row.

Furthermore, a junction box for expanding electrical safety systems is already known "in which the expansion of existing systems by adding one or any Number of junction boxes of the same sizes can be made. There are already some disadvantages when using this junction box of the now known system avoided. Nevertheless, also through this connection box has not yet resolved the difficulties in expanding existing systems, because it is necessary, in order to be able to arrange a connection box, to have a

Claims (2)

Open the already assembled box and at the same time expose live cables. If the junction box is sealed, as is generally the case, the electricity company must also be called in to remove the seals. In the connection box according to the invention, the aforementioned disadvantages when one or more connection boxes are arranged in series with connection boxes already installed and provided with current-carrying lines are avoided. The attachment can be carried out without opening the assembled connection box, so that the seals are only released when the newly completed line is put into operation by the electricity works. The junction box is made of cast iron, sheet metal or fireproof pressed material and contains a three-pole fuse element of special construction, which makes it possible to make new connections of riser lines regardless of the current strengths or cross-sections of already installed lines. It is only necessary to take into account that the total load on all risers does not result in an overload of the connection cable laid by the electricity company. The connection box is shown in the drawings. Figs. 1 to 3 show the base plate of the connection box in three views, while Figs. 4 and 5 show a closed and an open connection box, which are lined up. Fig. Ι shows the lower part of the connection box and particularly reveals the features that form the subject of the invention. The lower part of the connection box is formed from the base plate with the two transverse walls a. The extensions of the transverse walls a are on the one hand formed into two guide strips 5, while on the other hand they each end in two grooves c and d and two guide strips e. The guide strips b are used in the +5 first junction box of a new system to accommodate an inlet wall I (Fig. 4) with nozzle for introducing the connecting line of the house connection box to the connection box of the first riser. The grooves c (Fig. 1) are used to accommodate an exchangeable side wall φ (Fig. 4) and the nozzle g for the optional introduction of the lines. The tabs Ji and i (Fig. 2) are used to attach the locking screws of the cover to the lower part. In Fig. 4 and 5, a locked connection box and a newly lined up box is shown, the lined up without opening the locked box. After closure by the cover m, the guide strips δ and the grooves c are covered, so that neither the insertion wall Z nor the side wall f can be removed, while the grooves d and guide strips e used to line up a further connection box remain free. The box shown in Fig. 4 is closed in a known manner by a sealable wing nut n. The strips marked f (Fig. 1) serve as support surfaces for the built-in locking element, while the inspection holes 0 ■ (Fig. 4) in the lid for Control of the fuse cartridges are provided. The gist of the invention resides in the following advantages. The expansion of electrical safety systems for risers can be carried out easily and clearly using the connection box. Furthermore, it is achieved that unauthorized interventions in the plants in the company are made impossible. H. without having to open the sealed junction box in the company. Only after the completion of an expanded new system are the seals removed, the replaceable side wall of the opened box is removed and reinserted into the grooves provided for this purpose in the newly assembled box, whereupon the connection under the security elements is made by bridges. After the lid has been closed, the boxes form a completely closed whole. Patunτ Claims: 1. Junction box with exchangeable walls for electrical risers, characterized in that on the transverse walls («) of the base plate of the housing on the one hand guide strips (δ), on the other hand grooves (c, d) and guide strips (e) for inserting and removing the side walls of the housing and are attached for the cultivation of other similar junction boxes, in such a way that the cultivation of these additional boxes can be carried out without disturbance and without loosening the seals of the already existing boxes. 2. Connection box with exchangeable walls for electrical risers according to claim 1, characterized in that the side wall of the first connection box is provided with a pipe socket (k) for receiving the pipe for the lines. 1 sheet of drawings.