JPH10208557A - Low-voltage wiring cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce troubles in grounding work and reduce manufacturing cost by constituting a grounding wire conductor so as to directly covered with a sheath or constituting a conductor covering insulator by a covered insulation body of the other wiring core on a thin layer. SOLUTION: First and second power supply wire cores 4 and 8 in which first and second conductors 2 and 6 are covered with black and white insulation bodies 3 and 7 and a sheath 10 and a grounding wire 9 that is a third conductor are integrally covered with a sheath 10 which is normally colored in gray. Thereby, in case that the grounding wire 9 is connected to an earth terminal such as equipment, insulation body striping work is eliminated. In addition, the grounding wire 9 is covered with an insulation body thinner than the insulation bodies 3 and 7 of the power supply wire cores 4 and 8, thereby insulation with the power supply wire cores 4 and 8 is doubled, and its stripping is facilitated. Conductors 2, 6, and 9 in addition to a single wire are applicable even in case of stranded wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cable for low-voltage wiring, and more particularly to a cable for low-voltage wiring in which a wiring core including a grounding core is integrally covered with a PVC sheath.

[0002]

2. Description of the Related Art As an indoor wiring cable, for example, a low-voltage wiring cable in which a power supply core and a grounding core are integrally covered with a sheath is generally used. As this low voltage wiring cable, for example, a 600 V vinyl insulated vinyl sheath cable flat type (hereinafter, referred to as “VVF”) is known. VVF is, as shown in FIG.
For example, a three-core structure in which the power supply cores 51 and 52 and the ground core 53 are covered with insulators 55, 56 and 57, respectively, and then integrated together with a sheath 60 is often used.

In order to distinguish between the power supply cores 51 and 52 and the grounding core 53, each of the insulators 55, 56, 5
7 have different colors. For example, the insulator 55 of the power supply cores 51 and 52 is black,
6 is white, and the insulator 57 of the ground wire 53 is green or the like. This prevents erroneous wiring at the time of wiring work and improves workability. The power supply wires 51 and 52 and the ground wire 53 are substantially the same except for the color of the insulator.

[0004]

However, in the conventional low voltage wiring cable described above, when the grounding wire 53 is used,
Since it is necessary to peel off the insulator 57, there is a problem that the grounding work is troublesome. In addition, this ground wire 53
Is for grounding the equipment to which the power supply cores 51 and 52 are wired to prevent electric shock to the human body. The grounding core 53 has no ground voltage.
Although it is not necessary to cover the insulator 57 originally, the wire 53 for grounding is covered with the insulator 57 by a conventional practice. For this reason, it has been difficult to reduce the cost of the low-voltage wiring cable due to an increase in the number of production steps and an increase in the material for forming the insulator 57. In addition, as described above, there is a problem in workability when used as a ground wire.

Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a low-voltage wiring cable that can reduce the time and labor required for grounding work and reduce the manufacturing cost. .

[0006]

According to the present invention, there is provided a low-voltage wiring cable according to the present invention, wherein a wiring core including a ground wire is integrally covered with a sheath. The conductor is directly covered with the sheath, or the covering insulator of the conductor is formed to be thinner than the covering insulator of the other wiring core.

The grounding wire is constructed so that the conductor is directly covered with the sheath, and the trouble of removing the insulator is eliminated, so that the grounding work can be facilitated. Also, in the manufacture of low-voltage wiring cables, the conductor used for the ground wire is directly covered with a sheath and the insulator is omitted, eliminating the need for an insulator material covering the conductor, reducing material costs and improving productivity. Improvement can be achieved.

[0008] Alternatively, if the insulator for covering the conductor as the ground wire is formed in a thinner layer than the insulator for the other wire core, the insulator can be easily peeled off from the ground wire. Similarly to the above, the insulation between the power supply wire core and the power supply wire core can be doubled.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a low-voltage wiring cable according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external perspective view of an end of a low-voltage wiring cable according to a first embodiment of the present invention. As shown in FIG. 1, this low-voltage wiring cable (VVF) 1
A second power supply core 4 in which the second conductor 6 is covered with a white insulator 7; a third power supply core 8 in which the second conductor 6 is covered with a white insulator 7; Ground wire 9 which is a conductor of
And a sheath 10 for integrally covering the striatum.

First conductor 2, second conductor 6, and ground line 9
Is formed of a soft copper wire, a soft copper stranded wire, an aluminum stranded wire, or the like. Each of the insulators 3 and 7 is made of a synthetic resin material such as polyvinyl chloride (PVC), has a self-extinguishing property, and is a colorable coating. The circuit identification is facilitated by coloring the insulator 3 of the first power supply core 4 in black and the insulator 7 of the second power supply core 8 in white. The sheath 10 includes first and second power supply cores 4 and 8.
Is a coating that can be colored with the same synthetic resin material as polyvinyl chloride (PVC) or the like as the insulators 3 and 7. The sheath 10 is generally colored gray.

According to the VVF 1 of this embodiment, the ground wire 9 is configured so as to be directly covered with the sheath 10 without the insulator. For example, the ground wire 9 can be covered as shown in FIG. In the case of connection to the ground terminal 15c of the device 15, the stripping operation of the insulator in the conventional structure is not required, thereby simplifying the grounding operation and shortening the operation time. Further, when the VVF 1 including the ground line 9 is manufactured, the insulator coating of the ground line 9 is omitted, so that the number of production steps can be reduced, the material cost can be reduced, and the product cost can be reduced.

Next, a case where the VVF 1 is connected to a device will be described with reference to FIG. FIG. 2A shows a VVF 1 in which a first power supply core 4, a second power supply core 8, and a ground wire 9 are covered with a sheath 10. In FIG. 2B,
The sheath 10 is peeled off from the first power supply core 4, the second power supply core 8, and the ground wire 9, and the first power supply core 4, the second power supply core 8, Ground wire 9 to sheath 1
Expose from 0.

In FIG. 2C, the black insulator 3 of the first power supply core 4 is peeled off to expose the first conductor 2. Further, the white insulator 7 of the second power supply core 8 is used.
To expose the second conductor 6. Next, the first conductor 2 is connected to the anode terminal 15a of the device 15, the second conductor 6 is connected to the cathode terminal 15b of the device 15, and the ground wire 9 is connected to the ground terminal 15c of the device 15.

In the above-described first embodiment, the case where the ground wire 9 is directly covered with the sheath 10 without covering with the insulator has been described. However, this is shown in the low-voltage wiring cable 20 (second embodiment) of FIG. As described above, the ground wire 9 may be covered with the insulator 21 which is thinner than the insulators 3 and 7 of the first power supply core 4 and the second power supply core 8. Note that FIG.
In the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

According to the second embodiment, since the ground wire 9 is covered with the thin insulator 21, the insulator 21 can be easily peeled off, and the time required for grounding the ground wire 9 can be shortened. can do. When the low voltage wiring cable 20 is manufactured, since the ground wire 9 is covered with the thin layer of the insulator 21, the amount of the insulator material for covering the conductor is reduced as compared with the conventional structure, and the cost is reduced. Can be achieved.

In each of the above embodiments, the low-voltage wiring cable has been described as a VVF, but the present invention is not limited to the VVF but may be applied to other cables and the like.

In each of the above embodiments, a single wire is used as the conductor. However, a stranded wire may be used as the conductor. That is, in the low-voltage wiring cable (VVF) 1A shown in FIG. 4, the conductor 2a of the first power supply core 4, the conductor 6a of the second power supply core 8, and the ground wire 9a are both twisted. It is composed of lines. The black insulator 3 of the first power supply core 4, the white insulator 7 of the second power supply core 8, and the sheath 10 that integrally covers these filaments are the same. Is configured. By adopting such a stranded wire as the conductor, if a large conductor size is required to flow a large amount of current, flexibility that cannot be obtained with a single wire can be obtained. It is valid.

[0018]

As described above, according to the cable for low voltage wiring according to the present invention, the conductor is directly covered with the sheath as the ground line, and the insulator for covering the conductor in the conventional structure is omitted. Become. Therefore, when the ground wire is connected to the ground terminal of the device, it is not necessary to remove the insulator from the ground wire. In addition, when manufacturing a low-voltage wiring cable including a ground wire, the step of insulating and coating the ground wire can be omitted.
The number of man-hours for producing the distribution cable can be reduced. Furthermore, since it is not necessary to cover the ground wire with an insulator, material cost can be reduced. Alternatively, if the covering insulator of the conductor as the grounding wire core is made thinner than the covering insulator of the other wiring wire core, when connecting the grounding wire to the ground terminal of the device, the insulator from the grounding wire is removed. Since it can be easily peeled off, the time required for grounding the ground wire can be shortened.
Also, when manufacturing a wiring cable including a ground wire,
Since it is only necessary to cover the ground wire with a thin layer of insulator, the amount of insulator material used to cover the conductor can be reduced and cost can be reduced. In addition, the same effect of insulation with the power supply core as in the conventional structure can be obtained.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a low-voltage wiring cable according to a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams for explaining the use of the low-voltage wiring cable of FIG. 1; FIG. 2A is an initial state, FIG. 2B is a terminal processing state with a sheath removed, and FIG. State.

FIG. 3 is an external perspective view of a low-voltage wiring cable according to a second embodiment of the present invention.

FIG. 4 is an external perspective view of a low-voltage wiring cable according to the present invention in which a stranded wire is used as a conductor.

FIG. 5 is an external perspective view of a conventional low-voltage wiring cable.

[Explanation of symbols]

 1, 20, 1A Low-voltage wiring cable (VVF) 3, 7 Insulator for power supply wire core (insulating insulator) 4, 8 Power supply wire core (wiring wire) 9 Ground wire 10 Sheath 21 Ground wire Insulator (coating insulator)

Claims (1)

[Claims] 1. A low-voltage wiring cable in which a wiring core including a grounding wire is integrally covered with a sheath, wherein the grounding wire is configured to directly cover a conductor with the sheath, or a covering insulation of the conductor. A low-voltage wiring cable, wherein a body is formed in a layer thinner than a covering insulator of the other wiring core.