JP2570759B2 - Flat cable with branch for low voltage trunk line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the provision of a low-voltage main line branching flat cable suitable for a vertical main line of a building or the like.

[Conventional technology]

2. Description of the Related Art In recent years, with the increase in height, size, and information of buildings, measures to reduce the voltage drop of low-voltage trunk lines in buildings have become increasingly important.

Conventionally, in view of such a situation, as a cable for reducing the voltage drop by lowering the impedance, a plurality of conductors are arranged in parallel, and these are collectively flattened via an insulator provided on the conductors. There is a flat cable constructed by applying a sheath, a plurality of flat cables are laminated using the flat surface of the flat sheath so that the distance between the cable conductors is reduced, and each phase R, S , T, to maintain low impedance characteristics.

Such a flat cable is laid vertically on a shaft in a building, and is inserted into a distribution board on the floor by a branch cable from an appropriately set branch portion.

By the way, when a branch cable is branched and connected in such a flat cable, conventionally, as shown in FIG.
The branch terminal 6 is connected or integrated to the plurality of parallel conductors 5 exposed by removing the flat sheath 3 and the insulator 4 by welding or compression.
6a, one end of the branch cable 7 is terminated and connected by a compression sleeve 8 or the like.
In addition, the terminal connection portion of the branch cable 7 is covered with a protective cover 9 and is insulated to form a so-called flat cable with a prefabricated branch.

The flat cable with branch configured in this manner is used in a so-called radial system using the flat surface, and is wound around a drum with the branch cable integrated, and is supplied for shipping and transport. In view of the fact that the strips are laminated and provided for laying, etc., it is considered that the connection branch portion 6a of the branch terminal is projected to the side edge side of the flat sheath 3 so as not to form a large projection on the flat surface side of the sheath 3, The branch cable 7 is extended along the side edge of the flat sheath 3 so as not to hinder the winding of the drum.

Conventionally, the branch section of such a flat cable is set corresponding to each floor of the building, but when connecting to an electric system at a plurality of different positions per floor, each electric system is individually provided. Are set at different positions, and the branch cable derived from each branch is guided to the corresponding system.

[Problems to be solved by the invention]

Although the branch portion set and configured as described above is designed so as not to form a large protrusion on the flat surface of the flat sheath by considering the connection branch portion of the branch terminal and the lead-out direction of the branch cable. Inevitably, the thickness of the branch portion is inevitably greater than the thickness of the cable main body, and in that portion, the center-to-center separation between the cable conductors is inevitably increased. If such branching portions are increased in number on each floor as described above, they adversely affect the low impedance characteristics obtained by bringing the cable conductors of each phase closer together, and, consequently, lower the voltage drop due to the laminated flat cable. There was a problem that the characteristic features could not be fully exploited.

Also, as described above, the number of branches increases,
Since it must be commercialized through many manufacturing processes,
Manufacturing and product costs had to be large.

The present invention has been made in view of the above-mentioned problems of the prior art, and in addition to providing a large number of branch cables, it is possible to sufficiently bring out the low impedance performance, and the production and product costs are small. The purpose is to provide a flat cable with a branch.

[Means for solving the problem]

A flat cable with a branch for a low-voltage trunk line according to the present invention provided to achieve the above object has a conductor as shown in FIG.
11 are arranged in parallel, and a flat sheath 13 is provided on these conductors via an insulator 12 to constitute a flat cable body 10. In step (2), the flat sheath and the insulator are removed to expose a plurality of conductors, and a centrally inserted cylindrical portion 16a of a substantially H-shaped branch terminal 16 is fitted to these conductors to be integrally connected. Substantially T-shaped connection branches on both sides of the branch terminal
16b, 16b and 16b, 16b are positioned on both side edges in the width direction of the flat cable body so as to extend along the cable longitudinal direction,
The end of the conductor 15a of the branch cable 15 is connected to the extended end of each of the four connection branches.

〔Example〕

FIG. 1 shows a preferred embodiment of the present invention.
The flat cable body 10 has a plurality of conductors 11 (about 4 to 6), which are formed by concentrically twisting copper wires, and is arranged in parallel. An insulator 12 is formed by extruding a resin such as resin or cross-linked polyethylene, and a flat sheath 13 is formed thereon by extruding a resin such as a vinyl resin.

In the case of a low-voltage trunk line, for example, a three-phase three-wire line, the flat cable body 11 is formed into three strips, and the cables are stacked using the flat surface of the flat sheath 13 so that the cable conductors are connected to each other.
Each phase of R, S, T is to play one phase.
As described above, the cable conductors that carry the respective phases are sufficiently close to each other via the flat surface of the flat sheath 13 to maintain low impedance characteristics.

Now, the flat cable body 10 configured as described above
For example, the branch portions 14 are set at predetermined intervals corresponding to the electric system on each floor of the building, but according to the present invention, a plurality of branches, that is, up to four branches Cables 15, 15, 15, 15 are drawn out.

That is, at each branch portion 14 set in the flat cable main body 10, the flat sheath 13 and the insulator 12 are removed to expose a plurality of conductors 11 (hereinafter, referred to as parallel conductors), and the exposed portions are exposed. An interrupting tubular portion 16a at the center of the substantially H-shaped branch terminal 16 is fitted to the parallel conductor 11 and connected integrally by welding or compression, thereby forming a substantially H-shaped branch terminal on both sides of the branch terminal. T-shaped connecting branches 16b, 16b and 1
6b and 16b are positioned on both side edges in the width direction of the flat cable main body 10 so as to extend along the longitudinal direction of the cable, and the conductor 15a of the branch cable 15 is connected to each of the four connection branches 16b, 16b, 16b and 16b. The connection is made by a compression sleeve 17. The four branch cables 15, 15, 15, 15 branched and connected to the common branch terminal 16 in this way extend in opposite directions, two by two, on both side edges of the flat sheath 13 of the flat cable body. It will be provided as follows.

Reference numeral 18 denotes a protective cover made of vinyl, which is opened from a split portion appropriately formed on itself, and is provided so as to extend between the separated separation portions of the flat sheath 13 and the end of the insulating coating 15b of the branch cable 15. Thereby, the parallel conductor 11, the branch terminal 16, and the branch cable connection portion including the exposed portion of the compression sleeve 17 are insulated and protected.

The protective cover 18 has an insulating compound 19
Is filled, and an insulating tape winding process 20 is applied between the cover 18 and the flat sheath 13 and each branch cable 15 to achieve watertightness.

〔The invention's effect〕

According to the flat cable with branch for a low-voltage trunk line of the present invention as described above, in each branch portion, a substantially H-shaped branch terminal is integrally connected to the parallel conductor of the flat cable main body, and The connection branch portions having a substantially T-shape on both sides are positioned so as to extend in the longitudinal direction of the cable at both side edges in the width direction of the flat cable, and branch cables are connected to these four connection branch portions. It is possible to branch up to four branch cables without forming a large protrusion in the thickness direction of the cable body, and therefore, the number of branch portions to be set can be greatly reduced. Thereby, a large number of branch cables are attached, and one flat cable main body is assigned to one phase, and the flat cable main bodies for the number of phases are stacked on the flat surface of the flat sheath to bring each cable conductor close to each other. As a result, it is possible to achieve both the desired draw-out of low impedance performance and the reduction of the number of branches, so that the manufacturing and product costs can be reduced, and the practical effect is large.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a flat cable with a branch for a low-voltage main line according to the present invention near a branch section, and FIG. 2 is an example of a conventional flat cable with a branch for a low-voltage main line near a branch section. FIG. In the code, 10 is a flat cable body, 11 is a parallel conductor,
Reference numeral 12 denotes an insulator, 13 denotes a flat sheath, 14 denotes a branch portion, 15 denotes a branch cable, 16 denotes a branch terminal, 16a denotes a tubular portion with a center interrupt, 16b denotes a connection branch portion, and 17 denotes a compression sleeve.

Claims (1)

(57) [Claims] A flat cable body is formed by arranging a plurality of conductors in parallel and applying a flat sheath to the conductors via an insulator. At each branching portion 14, the flat sheath and the insulator are removed to expose a plurality of conductors, and a cylindrical portion 16a having a central portion of a substantially H-shaped branch terminal 16 is fitted to these conductors. Connection is integrated, and the substantially T-shaped connection branches 16b, 16b and 16b, 16b on both sides of the branch terminal are positioned on both side edges in the width direction of the flat cable main body so as to extend along the cable longitudinal direction. A flat cable with a branch for a low-voltage trunk line, characterized in that an end of a conductor 15a of a branch cable 15 is connected to an extension end of each connection branch on each side.