JPH0845355A - Distribution line - Google Patents

Abstract

PURPOSE:To enable an insulated conductor for connection to be taken out from a certain position of the inside of a multiconductor cable and be connected to a plurality of subjects for connection such as distribution boards by enclosing within the multiconductor cable the insulated conductor to be connected to the plurality of subjects for connection. CONSTITUTION:A self-supporting cable 9 is laid vertically along the inside of an electric pipe shaft in a building, with the upper part 6a of its suspension wire 6 secured to the ceiling 10. By stripping off a predetermined length of the common sheath 7 of the self-supporting cable 9 located in the first floor portion, a predetermined length of an insulated conductor 2 is taken out from inside the cable and directly connected electrically to a subject 11a for connection which is installed on the first floor. Similarly, predetermined lengths of the insulated conductor 2 are taken out from inside the cable by stripping of the sheath 7 at predetermined positions, and are connected to subjects for connection on the second to seventh floors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution line used for internal wiring in condominiums, office buildings, factories and the like.

[0002]

2. Description of the Related Art Generally, as a low-voltage trunk line in a condominium, an office building, etc., a so-called branch line is formed by connecting a required number of branch lines at predetermined positions in a factory and vinyl-molding the connection parts of the branch lines. The main cable with a cable is often used.

[0003]

By the way, since the connection portion of the branch line is processed in a factory where quality control is performed for conductor connection and insulation molding work, a considerable work space is required and the factory management is performed. There was a problem with the above and securing work personnel. Further, since the work of forming the connecting portion of the branch line is almost manual work, there is a problem that it takes a lot of time and labor.

The present invention has been made paying attention to such a point, and a branch line is taken out from an arbitrary portion of a multi-core cable used for internal wiring of a condominium, an office building or the like, and the branch line is taken out from a distribution board or the like. It is an object of the present invention to provide a power distribution line that can be connected to an object to be connected very easily.

[0005]

In the power distribution line of the present invention, a multicore cable having a plurality of insulated wire cores is laid on a laying route in which a plurality of objects to be connected are arranged at predetermined intervals. The insulated wire cores respectively taken out from the inside of the multi-core cable at a predetermined interval along the longitudinal direction of the multi-core cable are connected to the corresponding connected bodies, respectively. It has a feature.

[0006]

In the distribution line of the present invention, since the insulated cores to be respectively connected to the plurality of connected bodies are included inside the multi-core cable, a predetermined number is provided along the longitudinal direction of the multi-core cable. By cutting the sheath at each interval, the insulated core to be connected can be taken out from the inside, and this can be directly connected to a connected body such as a distribution board.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view of a multi-core cable used in the present invention, FIG. 2 is a cross-sectional view of another multi-core cable, and FIG. 3 is an explanatory view showing a laid state of the multi-core cable shown in FIG.

In FIG. 1, reference numeral 1 denotes a multi-core cable, and this multi-core cable 1 has a plurality of insulated wire cores 2.
And a sheath 3 provided above the twisted pair of the insulated wire cores 2. The insulated wire core 2 is composed of a conductor 2a and a rubber / plastic insulator 2b provided on the outer periphery of the conductor 2a. As the size of the conductor 2a, a low-voltage power supply circuit in a condominium, an office building or the like has a relatively small capacity, so that 14 to 100 mm ² is sufficient, and the insulated wire core 2 is laid as follows. The same number of objects as the connected objects such as a distribution board arranged at predetermined intervals along the route are prepared. That is, the number of branching points is 12 or less per one trunk line. Therefore, for example, if seven branching points, that is, seven connected objects such as a distribution board are installed, seven insulated wire cores are required. A so-called 7-core multicore cable having is used. In this case, single phase 2
In the case of the wire type, it is desirable to take out two insulated wire cores 2 from the inside of the cable or to lay two multi-conductor cables and take out one insulated wire core 2 from each multi-core cable. . Similarly, in the case of a single-phase three-wire system, a three-phase three-wire system, or a three-phase four-wire system, take out three or four insulated wire cores 2 from inside the cable, or
It is desirable to lay a multi-strand or four-strand multi-core cable and take out one insulated wire core 2 from each multi-strand cable.

The materials of the rubber and plastic insulators 2b and the sheath 3 are determined in consideration of allowable current and voltage drop, but generally, crosslinked polyethylene insulated polyvinyl chloride sheath cable (CV cable) and polyvinyl chloride. An insulated polyvinyl chloride sheath cable (VV cable) is used. In addition, reference numeral 4 indicates an inclusion such as jute provided in the twisted gap of the insulating core 2, and 5 indicates a holding tape.

FIG. 2 shows another embodiment in which a so-called self-supporting cable having a suspension wire is used as the multi-core cable. In FIG. 2, the cable body 5
And the suspension wire 6 are integrated by a common sheath 7 that is extruded and covered in common over both the cable body 5 and the suspension wire 6. The cable body 5 is shown in FIG.
In the multi-core cable shown in Fig. 3, it has the same structure as the part excluding the sheath 3, and the suspension wire 6 is composed of, for example, seven steel wires having a diameter of 2 mm. In this embodiment, as will be described later, when the cable having such a configuration is laid vertically in the electric pipe shaft in the building, the upper part of the suspension wire 6 can be directly attached to the ceiling, so that the conventional trunk line with a branch has been used. It has the advantage that the wire grip and intermediate fixing cleat used in the case of a cable are unnecessary.

Next, the self-supporting cable shown in FIG.
A method of vertically laying in an electric pipe shaft in a building and connecting them to predetermined objects to be connected will be described.
In FIG. 3, reference numeral 9 indicates a self-supporting cable pulled out from the power receiving panel 8 in the basement of the high-rise building,
The self-supporting cable 9 is laid vertically along an electric pipe shaft in a building, and an upper portion 6a of a suspension wire 6 thereof is fixed to a ceiling 10. Therefore, a predetermined insulated wire core is connected to the connected body 11a such as a distribution board installed on the first floor as follows. That is, the common sheath 7 of the self-supporting cable 9 located on the first floor
(See FIG. 2) is stripped off for a predetermined length, an insulated wire core 2 (see FIG. 2) of a predetermined length is taken out from the inside of the cable, and this is directly connected to a connected body 11a such as a distribution board installed on the first floor.
Electrically connect to. Similarly, when wiring to the connected body 11b such as a distribution board installed on the second floor, the common sheath 7 of the self-supporting cable 9 at a position corresponding to the floor of the second floor is stripped off from the inside of the cable. The required number of insulated wire cores 2 is taken out, and this is electrically connected to the connected body 11b such as a distribution board installed on the second floor as it is. In the same manner, the insulated cores 2 are respectively taken out from the inside of the cable located in the connected body such as a distribution board to be connected and connected to the connected bodies 11c and 11d on the third to seventh floors, respectively. In addition, when the connected bodies 11a to 11d such as a distribution board installed on the floors of the floors are present at positions distant from the electric pipe shaft, the insulated wire cores taken out from the inside of the cable are separately provided. It is desirable to connect the other insulated wire (not shown) prepared in the above. Moreover, after taking out the insulated core, it is desirable to wind a waterproof tape (not shown) or the like around the sheath cut portion.

In the above-described embodiment, the case where a normal multi-core cable is used as the structure of the multi-core cable is described, but the present invention is not limited to the multi-core cable having such a structure. Inserting a suspension wire into an interstitial material that fills the twisted gap of the insulated wire core, twisting the cable body and the suspension wire together, or placing the suspension wire along the outer periphery of the multicore cable shown in FIG. It is possible to use the one integrated with the bind line. Also,
Instead of a so-called round multicore cable, use a so-called flat multicore cable in which multiple insulated wire cores arranged in parallel are adhered to each other, and a sheath is provided on the outer circumference of the core, if necessary. Good.

[0013]

As described above, according to the present invention,
As a cable used for the distribution line, for example, a general multicore cable having the same number of insulated cores as the number of objects to be connected such as a distribution board can be used. Eliminates the need for special cables Also, in the field, after extending the multi-core cable,
Since the sheath can be stripped off at a predetermined location (location where the connected body such as distribution board is installed), the insulated core can be taken out from the inside of the cable and directly connected to the connected body such as distribution board. It becomes unnecessary to perform the prefabricated branching process in the factory after accurately determining the mounting position of the branching line and the length of the branching line, as in the case of the branching main cable. Therefore, the cable can be easily manufactured and the delivery time can be shortened. Furthermore, when laying a multi-core cable with a suspension wire vertically inside an electric pipe shaft in a building,
No wire grips or suspension sleeves are required, and no intermediate cleat to hold the cable in the middle of the cable is required, so it is easy to extend and suspend the cable, and a cheap power distribution line can be provided. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a multicore cable used in the present invention.

FIG. 2 is a cross-sectional view of another multicore cable used in the present invention.

FIG. 3 is an explanatory view showing a state in which the self-supporting cable according to the present invention is wired in an electric pipe shaft in a building.

[Explanation of symbols]

 1 ………… Multi-core cable 2 ………… Insulated wire core 3 ………… Sheath 4 ………… Inclusion 5 ………… Cable body 6 ………… Suspension wire 7 ………… Common sheath 9 ………… Self-supporting cable

Claims (1)

[Claims] 1. A multicore cable having a plurality of insulated wire cores is laid on a laying route in which a plurality of connected bodies are arranged at predetermined intervals, and the multicore cable is laid along the longitudinal direction of the multicore cable. A power distribution line, wherein the insulated cores respectively taken out from the inside of the multi-core cable at predetermined intervals are respectively connected to the corresponding connected bodies.