JPH0564006B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a low-voltage line branching/pulling system.

[Prior Art] In recent years, it has been particularly desired to beautify and simplify the installation of poles using a branch/lead power distribution system for low-voltage lines. For example, as part of urban planning, power distribution lines are being moved underground, but there is a large aesthetic disparity between the underground parts and the overhead wiring parts around the underground areas, so it is necessary to beautify and simplify the installation of poles in the overhead wiring parts. has become even more desirable.

Therefore, conventional methods have been proposed in which the arm for pulling in the utility pole is eliminated, or a small-diameter utility pole is used, and the protective fuse is housed in a branch lead-in box with an opening/closing lid for the branch line. This branch lead-in box is attached directly to the utility pole.
It is designed to be installed along the pole according to the outside diameter of the pole.

[Problems to be Solved by the Invention] However, conventional branch lead-in boxes either simply store branch lines casually for the purpose of concealing them, or they do not have protective fuses or branch lines arranged in a horizontal line. However, there were drawbacks such as difficulty in storage efficiency and maintenance and inspection after installation.

Furthermore, in recent years, from the viewpoint of maintenance, a switch is sometimes used on the low voltage wiring side. In this case, it is desirable to have uniform pole mounting for the two types of utility poles, those with switches and those without switches, but in the conventional branching/leaving method using branching/leaving boxes, consideration has not been given to this point. It had not been done.

Therefore, the object of the present invention is to use a branching box that has a good storage rate for branching lines and protective fuses, and is easy to maintain and inspect, so that it is easy to branch and draw low-voltage lines, and it also improves work efficiency. The purpose of the present invention is to provide a branching/leaving system that is flexible, and also allows for orderly division and wiring between each phase, thereby improving supply reliability.

Furthermore, the purpose of this invention is to
To provide a branch/lead system that can have the same branch lead-in box both when a switch is used and when it is not used on the low-voltage wiring side, and which can provide uniformity in the pole mounting state. It is in.

[Means for Solving the Problems] In order to achieve the above object, the branching/leaving box used in the branching/leaving method according to the present invention is configured as follows.

In other words, it can be mounted along a utility pole using the mounting bracket provided on the back side of the main unit, has an opening/closing lid on the front side, and has an insulating cleat with through holes divided into front, back, left, and right in the upper part of the interior. .

In addition, the branch line used in connection with this branch lead-in box is a composite branch line in which multiple branch lines are bundled and a screw terminal is provided at the upper end, and the branch lines are arranged separately in the through hole of the insulating cleat. It is built into the branch lead-in box.

Therefore, a low voltage line branching/drawing method using the above-mentioned branching/leaving box and composite branch line is constructed as follows.

First, when a switch is used on the low-voltage wiring side, the switch is attached to the utility pole at the top of the branch box containing the composite branch line, and the secondary side wire or low-voltage line of the transformer is connected to the switch. Introduce the screw terminal provided in the branch lead-in box into the branch lead-in box through the upper opening of the branch lead-in box and connect it with the screw terminal of the composite branch line, and also connect the drop-in line to the lower end of the branch line through the lower opening of the branch lead-in box. It is something that connects.

In addition, if a switch is not used, an external insulating cleat is attached to the utility pole or branch lead-in box above the branch lead-in box, and the lead-in ends of the low-voltage lines are separated and sandwiched by this insulating cleat. At the same time, the screw terminal connected to the lead-in end of this low-voltage line is introduced into the branch lead-in box from the upper opening of the branch lead-in box and connected to the screw terminal of the composite branch line, and the lower end of the branch line The service line is connected to the branch service box through the lower opening of the branch service box.

In any of the above cases, a drop-in line can be connected to the lower end of the desired branch line via an electric wire fuse. As this electric wire fuse, a known fuse having compression connection terminals at both ends may be used, but as claimed in claim 4, the compression connection terminal on the branch line connection side has a constant diameter, and the compression connection terminal on the drop line connection side has at least Preferably, the wire fuse has two diameters.

Other features include a branch lead-in box with an opening with a lid for screw-fastening work on the upper side of the main body, a branch lead-in box with a lid that can be opened and closed from either the left or right, and an insulating elastic box with a notch in the bottom opening for connecting the lead-in wire. A branch lead-in box provided with a bushing made of material is a preferred embodiment of a branch lead-in box.

[Operation] In the branching/drawing method according to the present invention,
A branch lead-in box is prepared in which an insulating cleat with through holes divided into front, rear, left, and right sections is installed in the upper part of the interior, and the branch line is a composite branch line in which multiple branch lines are bundled and a screw terminal is provided at the top end. , multiple sets of composite branch wires are arranged separately for each phase in the through hole of the insulating cleat and are housed in the branch lead-in box, so that the branch wires for each phase can be arranged in the front, rear, left, and right positional relationships within the branch lead-in box. They will be arranged in an orderly manner.
Therefore, storage efficiency is good and maintenance and inspection are easy.
In addition, since the branch line storage position for each phase is determined,
It becomes easy to align the low voltage line to be connected to this. Therefore, if you match the position of the screw terminal of the switch when using a switch and the screw terminal of the low voltage line when not using the switch to the branch line storage position, the same branch lead-in box can be used. It becomes possible to beautify the pillars.

The branching and lead-in method shown in claim 1 is a method using a switch, and the branch lines are arranged in an orderly manner in the branch lead-in box, and the storage ratio is good, and the position with the screw terminal of the switch is Easy to match, connect, and maintain and inspect. Since the branch line of each phase is a composite branch line, a plurality of drop-in lines can be connected to each phase.

The branching/leaving method according to claim 2 is a method that does not use a switch, and the branch lines are also arranged neatly and separately within the branching/leaving box, and the storage efficiency is good. In addition, the low-voltage line is securely positioned because the lead-in ends are separated and held by external insulating cleats, and the screw terminal connected to the low-voltage wire lead-in end and the branch line are screwed together. It is easy to connect with terminals using screws, and maintenance and inspection after connection is also easy. Further, since the low voltage line is sandwiched between the external insulating cleats, it is possible to prevent large tension from being applied to the branch line or the electric wire fuse connected thereto.

Further, in the third aspect, since the electric wire fuse is connected to the desired branch line, it is possible to protect the load.
Since it is connected on the extension of the branch line, even when attached to a plurality of branch lines, the electric wire fuses can be arranged and stored in an orderly manner in accordance with the divided arrangement of the branch lines.

Further, as claimed in claim 4, if the diameter of the compression connection terminal on the branch line connection side of the electric wire fuse is constant, and the diameter on the lead-in connection side is set to at least two types, the lead-in line that requires a diameter depending on the load can be used. It is easy to handle because it can accommodate variations in the diameter of the branch line and the type of branch line can be constant.

Further, as in claim 5, on the side surface of the upper part of the main body,
When using a branch lead-in box that has an opening with a lid for screw-fastening work, use this opening to connect the screw-fastened terminal of the compound branch line and the screw-fastened terminal of the switch or low-voltage line. Easy to work with. If you cover the opening with a lid after completing the work, there is no need to worry about foreign objects getting in.

[Embodiment] An embodiment of the low-voltage line branching/pulling method according to the present invention will be described below with reference to the accompanying drawings.

Figure 1 shows both the branching/leaving method using a switch and the branching/leaving method using an external insulation cleat. In the drawing, 1 is a branching/leaving box, 2 is a switch, and 3 is an external insulation A cover 4 is covered with a cleat.

A secondary electric wire 6 of a transformer 5 is connected to the switch 2 . 7 is a low voltage line branched from the switch 2. As described later, the switch 2 has a screw terminal 2a.
is provided, and this terminal is introduced from the upper opening of the branch lead-in box 1. In addition, external insulation cleat 3
As will be described later, the lead-in ends 7a of the low-voltage wires 7 can be separately arranged and held, and the screw terminals 7b connected to the lead-in ends are introduced from the upper opening of the branch lead-in box 1.

Reference numeral 8 denotes a lead-in wire, which is connected to the lower end of a branch wire, which will be described later, built into the branch lead-in box 1, with or without an electric wire fuse. 9 is a retaining insulator, 10 is a retaining fitting, 11 is a DV insulator, 12 is a messenger wire, 13 is a hanger, 14 is an intermediate support fitting, and 15 is a high voltage line.

Next, details of the branch lead-in box 1 will be explained according to FIG.

This branch lead-in box has a vertically elongated external shape along the utility pole, and the main body 1 can be attached to the utility pole using a tightening band or the like using a mounting bracket 16 provided on the back side.
7 and an opening/closing lid 18 provided on the front side of the main body so that it can be opened and closed from left and right and can be removed.

An insulating cleat 20 having through holes 19 arranged in front, rear, left and right sections is provided in the upper part of the interior of the main body 17. This insulating cleat has a three-part structure, with the rear part disassembled being fixed to the back of the main body, and the intermediate and front parts being fixed to the rear part with screws. The through hole 19 is formed by abutting concave portions formed on the abutting surfaces of each divided body. When the screw is loosened, the intermediate divided body and the front divided body are movable within the length range of the screw, and the through hole 19 is also enlarged. Of course, the divided body can be removed by removing the screws.

Reference numeral 21 denotes a plurality of sets of composite branch lines in which a plurality of branch lines 21a are bundled and a screw terminal 22 is provided at the upper end, which is arranged separately in the through hole 19 and built into the branch lead-in box 1. . 23 is an electric wire fuse connected to the lower end of the desired branch line, the compression connection terminals on the branch line connection side all have a constant diameter, and the compression connection terminal on the drop line connection side has a diameter that corresponds to the wire diameter of the drop line. The wire fuse has at least two different diameters so that the wire fuse can be selected, and an appropriate wire fuse can be selected for use.

For example, in the case of a three-phase four-wire system as shown in the figure, the composite branch line 21 may be arranged by phase, with the common phases A and B arranged at the front, and the neutral phase and power phase arranged at the rear. is preferable for maintenance and inspection. Furthermore, when connecting electric wire fuses, it is preferable for storage to vary the lengths of branch lines for each phase so that the electric wire fuses are not located at the same height.

The branch lead-in box is provided with an upper opening 24, and the screw terminal 2a of the switch 2 and the screw terminal 7b connected to the low-voltage line lead-in end 7a are introduced into the branch lead-in box through the upper opening 24. . 2
Reference numeral 5 denotes an opening formed on the side surface of the upper part of the branch lead-in box main body 17 for screw fastening work, as shown in FIG.
For example, connect the screw terminal 2a of a switch to the compound branch line 2
When connecting with the screw terminal 22 of No. 1 with a screw,
This opening 25 can be used to insert screws and screw-fastening tools, providing excellent workability. Reference numeral 26 designates a lid for closing the opening 25 after screwing and connecting to prevent foreign objects such as birds from entering. 2
Reference numeral 7 denotes a bushing made of an insulating elastic material that closes the lower opening of the branch draw-in box, and although only the main body side is shown in the drawing, a similar bushing is also provided on the opening/closing lid 18. This bushing 27 has
Introducing the lead-in line 8 into the branch lead-in box and connecting the branch line 21a
Alternatively, a notch 27a for connecting to the electric wire fuse 23 is formed. 28 is a hinge provided on the main body 17 and the opening/closing lid 18, 29 is an insertion rod,
The opening/closing lid 18 is provided on the left and right side edges of the branch draw-in box, and the opening/closing lid 18 can be removed by removing the insertion rod 29 on both the left and right sides, and can be opened/closed on either the left or right side by removing either the left or right side.

Next, regarding the configuration of the external insulating cleat 3, the fourth
This will be explained with reference to the drawings and FIG.

Reference numeral 30 denotes a utility pole mounting fitting; 31 a cleat holding fitting; an intermediate divided body 3a of an external insulating cleat 3 having a three-piece structure is fixed to the cleat holding fitting 31; 3b and 3c are left and right divided bodies, each of which is fixed to the intermediate divided body 3a with screws. The clamping hole 32, which allows the drawn-out ends 7a of the low-voltage wires to be separately arranged and clamped, is formed by abutting concave portions formed on the abutting surfaces of the respective divided bodies. If you loosen the screws, the left and right divided bodies 3b, 3
The cover 4 has an insertion groove 4 through which the lead-in end 7a of the low-voltage line is passed.
It has a.

The embodiment described with the above drawings merely shows one aspect of the low-voltage line branching/drawing method according to the present invention, and the secondary side electric wire of the transformer is connected to the switch, but the low-voltage line This does not eliminate the need to connect the retracting end of the Further, the auxiliary tool used for pulling in the lead-in wire is not limited to the illustrated example, and various means can be employed. In the illustrated example, a switch is installed on the utility pole where the transformer is located, and a low-voltage line branched from this switch is guided to the adjacent utility pole.
This method shows a method in which the lead-in end is held between external insulating cleats and led to a branch service box, but there are specific methods such as passing the low-voltage line through multiple utility poles and connecting the branched lead-in end to a switch or external insulating cleat. Various types of power distribution methods can be adopted.

[Effect of the invention] As mentioned above, the branching box used in the low-voltage line branching/leaving method of the present invention can be used in both cases where a switch is used and when a switch is not used. Ideal for branching and retracting systems. Furthermore, since each phase is separately arranged not only in the switch but also in the branch lead-in box and in the external insulating cleat, work at the time of branching and pulling is easy, and a reliable branching and pulling state can be obtained. In addition, since the inside of the branch lead-in box is arranged in an orderly manner, storage efficiency is high and maintenance and inspection are easy.

Since the branch line is a compound branch line, there are many branches. When the protective fuses are installed, they can be installed in an orderly array by connecting the electric wire fuses to desired branch lines, so that storage efficiency is not hindered and maintenance of the fuses is also easy. The electric wire fuse can be connected to the composite branch line from the beginning at the time of shipment from the factory, or it can be connected at the field as necessary.

If the diameter of the compression connection terminal of the wire fuse is changed only on the drop-in wire connection side, the type of branch wire can be unified, making it easy to manufacture composite branch wires, and making it easier to connect the wire fuses on-site. Ease of use is also guaranteed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the low-voltage line branching/leading-in method according to the present invention, FIG. 2 is a perspective view showing the relationship between a switch, an external insulating cleat, and a branching lead-in box, and FIG. 4 is a perspective view of the internal structure of the branch lead-in box with the lid open, FIG. 4 is a perspective view of the external insulating cleat with the cover removed, and FIG. 5 is an exploded perspective view of the main body of the external insulating cleat. It is. 1... Branch lead-in box, 2... Switch, 3... External insulation cleat, 4... Cover, 5... Transformer, 6
... Secondary side electric wire, 7 ... Low voltage wire, 7a ... Lead-in end, 8 ... Lead-in wire, 16 ... Mounting bracket, 17 ...
Main body, 18...Opening/closing lid, 19...Through hole, 20...
Insulating cleat, 21...Composite branch line, 21a...
Branch line, 22...Screw terminal, 23...Wire fuse, 24...Top opening, 25...Opening, 2
6...Lid, 27...Butsing.

Claims (1)

[Claims] 1. An insulating cleat that can be mounted along a telephone pole with a mounting bracket provided on the back side of the main body, has an opening/closing lid on the front side, and has through holes divided into front, back, left, and right in the upper part of the inside. A branch lead-in box is provided, and a plurality of sets of composite branch wires each having a plurality of branch wires bundled and provided with screw terminals at the upper end are separately placed in the through holes of the insulating cleat, and are arranged inside the branch lead-in box. The screw terminal of the switch, which is built into the branch lead-in box and is attached to the utility pole at the top of the branch lead-in box and connected to the secondary side electric wire or low-voltage line of the transformer, is introduced into the branch lead-in box from the upper opening of the branch lead-in box. A low-voltage line branching/drawing method that connects the branch line with screw terminals and screws, and connects the drop-in line to the lower end of the branch line through the opening at the bottom of the branch drop-in box. 2. A branch lead-in box that can be mounted along a utility pole using mounting brackets provided on the back side of the main unit, has an opening/closing lid on the front side, and is equipped with an insulating cleat with through holes divided into front, back, left, and right in the upper part of the interior. Multiple sets of composite branch lines, each consisting of a bundle of multiple branch lines and a screw terminal at the upper end, are separated and arranged separately in the through holes of the insulating cleat. An external insulating cleat is provided that can be attached to the lead-in box and the lead-in ends of the low-voltage wires are separated and held, and the screw terminals connected to the lead-in ends of the low-voltage wires that are separately clamped by the external insulating cleats are connected to the lead-in ends of the low-voltage wires. A low voltage line is introduced into the branch service box from the upper opening of the box and connected to the screw terminal of the composite branch line with screws, and the drop line is connected to the lower end of the branch line through the lower opening of the branch service box. Branch/retract method. 3. The low-voltage line branching/drawing method according to claim 1 or 2, wherein a drop-in line is connected to the lower end of the desired branch line via an electric wire fuse. 4 The wire fuse connected to the lower end of the branch line is
4. The low-voltage line branching and connection terminal according to claim 3, wherein the compression connection terminal on the branch line connection side has a constant diameter, and the compression connection terminal on the drop line connection side has at least two different diameters.
Retraction method. 5 Claim 1 or 2 using a branch draw-in box having an opening with a lid for screw fastening work on the side surface of the upper part of the main body.
Branching/drawing method of low-voltage line as described.