JP2002034141A - Low-voltage branch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-voltage branch device wherein the exposure of conductors are reduced when branching a live truck line and the efficiency of operation in a narrow area is enhanced. SOLUTION: A metallic body 12 is provided for pressing and joining the conductor 1a obtained by cutting and stepwise stripping the trunk line 1 of a low-voltage underground distribution cable extending to a specified point of branching and the conductor of a drop wire 4 extending from a specified customer into the insertion holes 12a at the three ends of the conductive metallic body extending in Y shape, respectively. An insulating covering member 14 is provided which covers the entire surface of the metallic body 12, insulates the metallic body, and has slits 14a of a specified length in the three ends thereof extending in Y shape. The ends of the insulating covering member 14 with the slits 14a formed therein are folded back, and the trunk line 1 and the drop wire 4 are thereby pressed and joined with the three ends of the metallic body 12. The folded portions of the insulating covering member 14 are returned to the original state and water-proofed by waterproof covers 16, and the trunk line 1 is thus branched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-voltage branching device, and more particularly, to a low-voltage underground wiring cable having a trunk line cut at a predetermined branching point and a lead-in line extending from a predetermined customer. The present invention relates to a low-voltage branch device that is electrically connected to branch.

[0002]

2. Description of the Related Art Conventionally, it has been important to secure power supply and safety in densely populated urban areas when supplying electricity through wiring cables. It has been neutralized. When supplying a voltage to each customer, the low-voltage underground wiring cable that has been underground is branched by cutting a trunk line extending at a predetermined branch point and installing a low-voltage branch device. Was. Such a conventional technique is disclosed, for example, in Japanese Patent Application Laid-Open No. 12-4516. FIG. 4 is a wiring diagram showing such a conventional low-voltage branch device. FIG. 5 is similar to FIG.
FIG. 3 is a perspective view showing details of the low-voltage branch device 20 shown in FIG. FIG. 6 is a sectional view showing a section taken along line BB shown in FIG. Here, for simplicity of description, FIG. 4 shows only one-phase connection of the trunk line of the low-voltage underground wiring cable that is plurally drawn into the branch point.

As shown in FIG. 4, a conventional low-voltage branching device 20 pulls a main line 1 extending by a pipeline 2 underground into a predetermined branching point 6 and branches (in FIG. 4, two branches). The conductors of the trunk line 1 and the branch line 5 are joined together and crimped together, and the branch line 5 connected to the trunk line 1 is directly connected to the drop line 4 extending from each customer. It has a structure to make it. The branching point 6 shown in FIG. 4 is a small-sized installation basin, which is the smallest box body that is buried in the ground and can be operated by an operator by inserting a hand from the ground.

A conventional low-voltage branching device 20 is shown in FIG.
As shown in the figure, a bifurcated limb 24 is attached to a cylindrical torso 24a.
b) a pair of waterproof covers 24 made of a shrinkable material having
And the C-type connector 22 for compressively connecting the conductor portions 1a and 5a, which are exposed by stepping off the covering portions of the trunk line 1 and the branch line 5 inside the waterproof cover 24, respectively. Have.

[0005] When the main line 1 is branched to the service line 4 of each customer (two branches in FIG. 4) using the conventional low-voltage branching device formed as described above, first, as shown in FIG. The main line 1 is drawn into a predetermined branching point 6 and cut to cut off the coating, and the predetermined length (about 1
２2 m), and the coating is stripped off at the center in the same manner as the trunk line 1. The trunk line 1 and the branch line 5 are
As shown in FIG. 5, the bifurcation 2 of the pair of waterproof covers 24 is provided.
4b, the conductors 1 of the trunk line 1 in the trunk 24a.
a and the conductor portion 1
Then, the conductor 5a of the branch line 5 is brought into contact with "a" and compression-connected by the C-type connector 22.

Thereafter, a pair of waterproof covers 24 are attached to the trunk 2
4a are fitted together so as to overlap each other, and then contracted.
As shown in the figure, the conductor 1a of the trunk line 1 and the conductor 5 of the branch line 5
a from the outside of the C-type connector 22 that has been compression-connected. In addition, waterproof processing is performed on the end portions 31, 32, 33, 34, and 35 of the waterproof cover 24 shown in FIG. 6 with a sealing member 28 such as a shrinkable tube or putty tape. The branch line 5 can supply a predetermined voltage to each customer from the main line 1 by being connected in a straight line to the service line 4 extending from each customer shown in FIG.

Thus, in the conventional low-voltage branching device,
A branch portion 6 such as a box body is provided in the ground, and the trunk line 1 of the low-voltage underground wiring cable is drawn into the branch portion 6, cut and stepped, and the conductor portion 1a of the trunk line 1 and the conductor portion of the branch line 5 are removed. 5a is connected to the branch line 5 by compression connection to the branch line 5 so as to extend from each customer.
Supplied a predetermined voltage to each customer.

[0008]

However, in the conventional low-voltage branching device, when the trunk 1 is branched at the branching point 6, no consideration is given to processing the trunk 1 in a live state. As shown in FIG. 5, there is a problem that the number of exposed conductors including the C-type connector 22 increases, and it is difficult to safely connect the trunk line 1 and the branch line 5. Further, in the conventional low-voltage branching device, it is very difficult to cut and connect the main line 1 in the narrow branching point 6 and to connect the branch line 5 together with the branch line 5 by the C-type connector 22. There was a problem that work efficiency for connecting the trunk line 1 and the branch line 5 was deteriorated.
An object of the present invention is to provide a low-voltage branching device that solves such a problem and reduces the exposure of a conductor portion during the operation of branching a main line in a live state, and improves the working efficiency at a narrow branching point. And

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a low-voltage branching device for cutting and branching a low-voltage underground wiring cable at a predetermined branch point where the trunk extends. A plurality of conductors, each of which has a conductor connected at a branch point and exposed by stripping at least one or more lead-in wires extending from a predetermined customer and being exposed, are each caulked and compression-connected. A metal body made of a conductive material having a hole, and an insulation in which the outer surface of the metal body is covered and insulated, and a slit that can be exposed by folding around the insertion hole into which the main line and the lead-in line are inserted and swaged is formed. After the insulating cover is folded back along the slit, the trunk line and the lead-in wire are inserted into the insertion holes and connected by compression, and then the folded back of the insulating cover is returned to the original state and prevented. By performing processing provided to allow the branch processing trunk.

[0010] Here, the metal body is formed by cutting a trunk by forming insertion holes at three ends of a bar-shaped conductor extending in a Y shape.
The book and one of the lead-in wires are compression-connected to make a single branch, and the insulating coating member covers the outer peripheral surface of the metal body and forms slits at three ends so that the periphery of the insertion hole can be exposed. Is preferably provided. In addition, after waterproofing, the conductors of the main line and the lead-in wire are each compression-connected to the insertion hole of the metal body, and the folded back of the insulating coating member is returned to the original state. It is preferable to maintain waterproofness by covering and sealing. In addition, the waterproof cover has one end side covered on the outside of the insulating covering member having the slit and seals the inside with an O-ring interposed therebetween, and the other end side is covered on the outer periphery of the main line and the lead-in line, and the shrinkable tube is formed. It is preferable to seal by attaching a sealing member such as. Further, the insulating covering member is preferably made of an insulating material having an insulating property such as rubber or plastic. In addition, the branch point where the trunk line branches is either the smallest box body that can be pulled in the ground and work is possible, or a hollow part such as a concrete box formed for underground wiring, a handhole, a manhole, etc. It is preferred that

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a low-voltage branching device according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a wiring diagram showing an embodiment of a low-voltage branching device according to the present invention. FIG. 2 is a perspective view showing details of the low-voltage branching device 10 shown in FIG. Also, FIG.
FIG. 3 is a cross-sectional view showing a cross section taken along line AA shown in FIG. 2. Here, for the sake of simplicity, FIG. 1 shows only one-phase connection of the trunk line of the low-voltage underground wiring cable that is drawn in multiple at the branch point.

As shown in FIG. 1, an embodiment of the low-voltage branching device according to the present invention is such that a trunk line 1 of a low-voltage underground wiring cable extending by a conduit 2 in the ground is placed in a predetermined branching point 6. A structure is provided in which the wire is pulled in and cut, and is branched by being electrically connected to a drop wire 4 extending from a predetermined customer. The branching point 6 shown in FIG. 1 is a small-sized installation basin, and is the smallest box body that can be buried in the ground to allow a worker to insert his / her hand from above the ground.

An embodiment of the low-voltage branching device 10 according to the present invention, as shown in FIG.
A metal body 12 for compressively connecting the trunk line 1 cut at (see FIG. 1) and the drop line 4 extending from a predetermined customer to three ends extending in a Y-shape with conductivity. An insulating covering member that covers the outer surface of the metal body 12 and insulates the metal body 12 and has a slit 14a having a predetermined length at three ends extending in a Y-shape. In addition, at three ends of the metal body 12, the insulating covering member 1 having the slit 14a formed therein is formed.
4 is provided with a waterproof cover 16 that covers the outside of the housing 4 and performs waterproof processing.

Here, as shown in FIG. 2, the metal body 12 has the insertion holes 1 respectively opened at three ends extending in a Y-shape.
2a is formed, and the conductors 1a and 4a (see FIG. 3) exposed by stepping off the coating of the cut main line 1 and the lead-in line 4 are formed so as to be inserted. Further, as shown in FIG. 3, the insertion holes 12a of the metal body 12 are formed so that the conductors 1a and 4a of the trunk line 1 and the lead-in wire 4 are inserted, respectively, and these three ends are crimped to enable compression connection. are doing.

The insulating covering member 14 is made of an insulating material such as rubber or plastic, and covers and insulates the outer surface (entire outer periphery) of the metal body 12 extending in the Y shape. The insulating covering member 12 is folded at three ends of the metal body 12 extending in the Y shape as shown in FIG.
The slit 14a is formed so that the end of the second part 2 can be exposed. The length of the slit 14a is desirably cut to a length substantially equal to the diameter of the insertion hole 12a of the metal body 12 shown in FIG.

At three ends of the metal body 12, the trunk line 1 is connected.
The waterproof cover 16 covers the outside of the insulating covering member 14 and performs a waterproof treatment so that the periphery of the conductor connected to the drop wire 4 is not exposed. As shown in FIG. 3, the waterproof cover 16 has a hollow cylindrical shape, one end of which covers the outside of the insulating covering member 14 and has an O-ring 17 on the inside to prevent water from entering, and the other end of the waterproof cover 16 has a trunk line. By attaching and sealing a sealing member 18 such as a shrinkable tube formed to match the outer diameter of the wire 1 and the lead-in wire 4 and having shrinkage, the connection between the main line 1 and the lead-in wire 4 can be reliably performed. Sealed and waterproofed.

When the main line 1 is branched to the service line 4 extending from each customer using the embodiment of the low-voltage branching device according to the present invention thus formed, first, as shown in FIG. Then, the trunk line 1 is drawn into the predetermined branching point 6 and cut to cut off the coating, and at the same time, the lead-in wire 4 extending from a predetermined customer is drawn in and the coating is stripped off in the same manner as the trunk line 1. In addition, the trunk line 1 and the drop line 4
As shown in FIG. 2, the cylindrical waterproof cover 16 and the sealing member 18 are inserted in advance. The main line 1 and the lead-in line 4 are inserted into the insertion holes 12a provided at the three ends of the metal body 12 in the branch location 6 as shown in FIG.
4a are each inserted and caulked from the outside to make a compression connection.

At this time, the conductor portions 1a, 4a are inserted into the insertion holes 12a.
When inserting and caulking, the conductors 1a and 4a of the trunk line 1 and the lead-in line 4 are inserted into the insertion holes 12a, and then, as shown in FIG. The caulking operation is performed by folding back the covering member 14. Therefore, in the present embodiment, the conductor portion exposed to the outside is reduced and the work can be performed safely, and the trunk line 1 and the lead-in wire 4 can be individually connected to the metal body 12 as compared with the prior art shown in FIG. Can be easily connected to the three ends.

When the trunk line 1 and the lead-in wire 4 are respectively connected to the three ends of the metal body 12 as described above, the waterproof cover 16 previously inserted into the trunk line 1 and the lead-in wire 4 and the sealing member 18 and the work of attaching the same. When attaching the waterproof cover 16 and the sealing member 18, first, the insulating covering member 14 folded back at the three ends of the metal body 12 is returned to the original state, and the returned insulating covering member 1 is returned.
Waterproof cover 1 so as to cover the slits 14a from the outside.
Move 6 and attach it. At this time, the waterproof cover 16
As shown in FIG. 3, since the O-ring 17 is interposed on the inner circumference at one end, the O-ring 17 provides a waterproof effect. The other end of the waterproof cover 16 is covered by the outer periphery of the trunk line 1 and the lead-in line 4. The sealing member 18 is moved to the end and contracted to seal the waterproof cover 16 to provide a waterproof effect. It has gained. Here, the embodiment in which the sealing member 18 uses a sealing member such as a shrink tube previously inserted into the main line 1 and the lead-in line 4 has been described.
If necessary, a tape such as an insulating tape (putty tape) may be wound. As described above, in the embodiment of the low-voltage branching device according to the present invention, when branching the main line 1 in the live state, the insulating covering member 14 is folded back to connect the main line 1 and the lead-in line 4 to the three ends of the metal body 12. Since individual compression connections can be made, exposure of the conductor portion can be reduced during work, and work efficiency in narrow branch points can be improved.

Although the embodiments of the low-voltage branching device according to the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and can be changed without departing from the gist thereof. . For example, although an embodiment has been described in which a metal body is formed in a Y shape and two trunk lines cut and connected to one lead-in line, the present invention is not limited to this, and a plurality of lead-in lines are connected. May be formed in a multi-branched metal body. In addition, although the embodiment of the branching portion composed of the small box body buried in the ground has been described, the invention is not limited to this. For example, a hollow portion such as a concrete box, a handhole, or a manhole may be used.

[0021]

As described above, according to the low-voltage branching device of the present invention, since the main body and the lead-in line are prefabricated so that they can be individually compression-connected to the metal body, the work at the branching point can be stepped and compressed. The operation can be simplified by being integrated with the operation, and the operation time can be significantly shortened, so that the operation efficiency can be improved. Further, according to the low-voltage branching device of the present invention, the outer surface of the metal body is covered with the insulating coating member, and the slit is turned back so that the main line and the lead-in line can be individually connected by compression. Electric shock can be prevented, and the safety of on-site work can be ensured.

[Brief description of the drawings]

FIG. 1 is a wiring diagram showing an embodiment of a low-voltage branching device according to the present invention.

FIG. 2 is a perspective view showing details of a low-voltage branch device shown in FIG. 1;

FIG. 3 is a sectional view showing a section taken along line AA shown in FIG. 2;

FIG. 4 is a wiring diagram showing a conventional low-voltage branching device.

FIG. 5 is a perspective view showing details of the low-voltage branch device shown in FIG. 4;

FIG. 6 is a sectional view showing a section taken along line BB shown in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main line 1a Conductor part 2 Pipe line 4 Lead wire 4a Conductor part 6 Branching point 10 Low-voltage branching device 12 Metal body 12a Insertion hole 14 Insulation coating member 14a Slit 16 Waterproof cover 17 O-ring 18 Sealing member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 1/06 311 H02G 1/14 A 1/14 9/10 9/10 H01R 4/00 A F term ( 5E085 BB02 CC03 CC05 CC09 DD13 EE38 GG11 GG15 GG38 HH06 JJ18 JJ38 5G355 AA03 BA01 BA14 BA15 CA06 5G369 AA05 BA04 BA06 EA01 5G375 AA02 BA16 BA26 BB03 BB21 BB43 BB81 CA02 CA14 CB07 DB33 CD08

Claims (7)

[Claims] 1. A low-voltage branching device for cutting and branching a trunk line of a low-voltage underground wiring cable at a predetermined branch point where the trunk line extends, the low-voltage branching device extending from the trunk line cut at the branch point and a predetermined customer. A metal body made of a conductive material having a plurality of insertion holes to be connected by compressing by inserting and caulking at least one or more of the lead-in wires to be exposed and crimped, and an outer surface of the metal body And an insulating covering member that forms a slit that can be exposed by folding the periphery of the insertion hole into which the trunk line and the lead-in line are inserted and caulked, and the insulating covering member is disposed along the slit. After the trunk line and the lead-in line are inserted into the insertion holes and compression-connected by folding back, the folded-back portion of the insulating covering member is returned to the original state and subjected to a waterproofing process. A low-voltage branching device provided so as to be capable of branching a trunk line. 2. The low-voltage branching device according to claim 1, wherein the metal body is formed by inserting insertion holes at three ends of a bar-shaped conductor extending in a Y-shape and cutting the main line. One of the lead-in wires is compression-connected to make a single branch, and the insulating covering member covers the outer peripheral surface of the metal body to form the third wire.
A low-voltage branching device, wherein a slit is formed at one end and turned so as to expose the periphery of the insertion hole. 3. The low-voltage branching device according to claim 1, wherein in the waterproofing process, the conductors of the trunk line and the lead-in line are each compression-connected to the insertion hole of the metal body, and the insulating cover member is folded back. A low-voltage branching device characterized in that after being returned to the original state, the connection between the trunk line and the lead-in line is covered with a waterproof cover from the outside and sealed to maintain waterproofness. 4. The low-voltage branching device according to claim 3, wherein one end of the waterproof cover is provided outside the insulating covering member having the slit, and the waterproof cover is hermetically sealed with an O-ring inside. A low-voltage branching device characterized in that the other end is covered by the outer periphery of the trunk line and the lead-in line, and is sealed by mounting a sealing member such as a shrinkable tube. 5. The low-voltage branching device according to claim 1, wherein the insulating covering member is made of an insulating material having an insulating property such as rubber or plastic. 6. The low-voltage branching device according to claim 1, wherein the branch point for branching the main line is the smallest box body that can work by drawing the main line in the ground. Voltage branching device. 7. The low-voltage branching device according to claim 1, wherein the branching point for branching the main line is a hollow portion such as a concrete box, a handhole, and a manhole formed for underground wiring. Low-voltage branching device.