JPH0340711A - Branching and leading-in system for low voltage line - Google Patents

Abstract

PURPOSE:To improve the containing rate and to facilitate maintenance end inspection by providing on insulating cleat, having a cover at the front side and through-holes arranged longitudinally and laterally at the inner upper section and fixable along a pole, for a fixing metal arranged at the rear side of the body. CONSTITUTION:A branch lead-in box 1 has a profile elongated along a pole and comprises a body 17 fixable through a fixing metal 16 arranged at the rear side end a fastening band to the pole and a cover 18 fixed openebly/ closably to the front side of the body 17. An insulating cleat 20 having through holes 19 arranged longitudinally and laterally is provided at the inner upper section of the body 17. The insulating cleat 20 is splitted into three sections, where the rear splitted section is secured to the rear face of the body and the intermediate and front splitted sections are secured through screws to the rear splitted section. The through-holes 19 are formed by butting the recesses formed in the matching faces of respective splitted sections.

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 1] In recent years, as a power distribution system for branching and drawing low-voltage lines, it has been particularly desirable to have beautiful and simplified pole installations.

For example, as part of urban planning, power distribution lines are being moved underground, but in the vicinity of underground areas, there is a large aesthetic disparity between underground and overhead wiring sections, and it is necessary to make the poles for overhead wiring sections more beautiful and simpler. has become even more desired.

Therefore, we have eliminated the arm for retracting utility poles from the past,
A method is in use that uses small-diameter utility poles to store protective fuses and branch lines in a branch lead-in box with an opening/closing lid. The branch lead-in box is attached directly to the utility pole, and is installed along the utility pole to match the outside diameter of the utility pole.

[Problem to be solved by the invention] However, the conventional branch lead-in box is one in which the branch line is housed in a black structure for the purpose of simply concealing the branch line.
The protective fuses and branch lines were arranged horizontally in a row, making it difficult to store and maintain and inspect 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, it is an object of the present invention that the same two branch lead-in boxes can be used both when a switch is used and when a switch is not used in low-voltage wiring, and the installation state of the poles is uniform. The purpose is to provide a branching/retracting method that allows for

[Means for Solving the Problems] In order to achieve the above-mentioned 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 wooden body, has an opening/closing lid on the front side, and has an insulating cleat in the upper part of the interior that covers through holes that are divided into front, rear, left, and right sections. It is said that

In addition, the branch line used for this branch lead-in box is
A plurality of branch lines are bundled together to form a composite branch line with a screw terminal provided at the upper end, which is divided into different colors in the through holes of the insulating cleat and housed in a branch lead-in box.

Therefore, the branching/drawing method of the low voltage line using the branching/leaving line 7r1 and the composite branching line is implemented as follows.

First, when a switch is used in low-voltage wiring (!jll), install the switch on the utility pole at the top of the branch lead-in box containing the composite branch line, and connect the secondary side wire of the transformer or the low-voltage line. Introduce the screw terminal provided on the switch 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 by screwing, and connect the lower end of the branch line to the lower opening of the branch lead-in box. The service line is connected through the cable.

In addition, when 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. 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 is connected to the screw terminal of the compound branch line by screws, and the screw terminal is connected to the lower end of the branch line. The service line is connected through the opening at the bottom 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 stamp surface of the main body, a branch lead-in box with a single-finger switch on both the left and right lids, and an insulator with a notch for connecting the lead-in line in the bottom opening. A branch draw-in box provided with a bushing made of elastic material is a preferred embodiment of the branch draw-in box.

[Function] In the branching/leaving method according to the present invention, a branching/leaving box is provided with an insulating cleat having transparent holes arranged front, back, left, and right in the upper part of the interior, and a branch line is formed by bundling a plurality of branch lines. This is a composite branch line with a screw terminal at the upper end, and multiple sets of composite branch lines are arranged separately for each phase in the through hole of the insulating cleat and are housed in the branch lead-in box. The branch lines are arranged in an orderly manner in the front, rear, left, and right positional relationships within the branch lead-in box. Therefore,
It has a good storage rate and is easy to maintain and inspect. Furthermore, since the branch line storage position for each phase is determined, it becomes easy to align the low voltage line 0υ1 to be connected to this branch line storage position.

Therefore, when using a switch, the screw terminal of the switch,
If the position of the screw terminal of the low-voltage line when a switch is not used is aligned with the branch line storage position, it becomes possible to beautify the installation of poles using the same branch lead-in box.

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. 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 wires are securely positioned because the lead-in ends are separated and held by external insulating cleats, and the screw terminals connected to the low-voltage wire lead-in ends and the screw terminals of the branch wires are securely positioned. It is easy to connect with 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 compression connection terminal of the electric wire fuse has a constant diameter on the branch line connection side and has at least two different diameters on the drop line connection side, the drop wire that requires a diameter depending on the load can be used. It is possible to deal with variations in the diameter of the branch line, and the type of branch line can be kept constant.
It is easy to handle.

Further, as in claim 5, when a branch draw-in box is used which has an opening with a lid for screw fastening work on the upper part of the main body,
When connecting the screw terminals of the compound branch line and the screw terminals of the switch or low-voltage line, you can use this opening to work on the hour wheel. After completing the work, cover the opening with a lid. There is no fear of foreign matter getting in.

[Example] Below, according to the attached drawings, branching and
An example of the retraction method will be described.

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 is provided with a screw terminal 2a, and this terminal is introduced from the upper opening of the branch lead-in box 1. Further, as described later, the external insulating cleat 3 can hold the lead-in ends 7a of the low-voltage wires 7 by separately arranging them, and connect the screw terminals 7b connected to the lead-in ends from the upper opening of the branch lead-in box 1. It has been introduced.

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 metal fitting, 11 is a DV insulator, 12 is a metsenger wire, 13 is a hanger,
14 is an intermediate support metal fitting, and 15 is a high voltage line.

Next, the malfunction 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 has a main body 17 that can be attached to the utility pole with a tightening band or the like at a mounting bracket 16 provided between the back and a main body 17 that can be opened and closed from left and right on the front side of the main body. It consists of a removably provided opening/closing ff18.

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 a rear divided body fixed to the back of the main body, and an intermediate divided body and a front divided body fixed to the rear divided body with screws.

The through hole 19 is formed by abutting four parts 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 wires in which a plurality of branch wires 21a are bundled and a screw terminal 22 is provided at the upper end.
9, they are separately arranged 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. There are at least two types of 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 the Sanwa four-wire system as shown in the figure, the composite branch line 21 may be arranged in separate phases, with shared A and B at the front and the neutral phase and power line 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. . Reference numeral 25 denotes an opening for screw fixing work formed on the side surface of the upper part of the branch lead-in box main body 17, and as shown in FIG. When connecting with a stop,
This opening 25 can be used to insert screws, screw fasteners, and tools, and is highly workable. Reference numeral 26 is a lid for closing the opening 25 after screwing and connection to prevent foreign matter such as crows from entering. Reference numeral 27 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 is shown in the drawing, a similar bushing is also provided on the opening/closing lid 18. This bushing 27 is formed with a notch 27a for introducing the lead-in line 8 into the branch lead-in box and connecting it to the branch line 21a or the electric wire fuse 23. Reference numeral 28 is a hinge provided on the main body 17 and the opening/closing lid 18, and 29 is an insertion rod, which is provided on the left and right side edges of the branch lead-in box. By removing either one, you can open and close it to either the left or right.

Next, the structure of the external insulating cleat 3 will be explained with reference to FIGS. 4 and 5.

30 is a utility pole mounting bracket, 31 is a cleat holding bracket, in which the intermediate divided body 3a of the external insulating cleat 3 having a three-part structure is fixed to the cleat holding bracket 31, and 3b and 3c are left and right divided bodies, each having an intermediate divided body. It is fixed to the body 3a with screws. The clamping hole 32, which can separately arrange and clamp the drawn-out ends 7a of the low-voltage wires, is formed by abutting four parts formed on the abutting surfaces of each divided body. By loosening the screws, the left and right divided bodies 3b and 3C are movable, the holding hole 32 can be expanded, and the left and right divided bodies can be removed. The cover 4 has a thread 4a through which the lead-in end 7a of the low-voltage line passes.

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 The auxiliary tool used for drawing in the lead-in wire is not limited to the illustrated example, and various means can be employed. Also,
The illustrated example shows a method in which a switch is installed on a utility pole where a transformer is located, and a low-voltage line branched from this switch is guided to an adjacent utility pole, and the lead-in end is sandwiched between external insulating cleats and guided to a branch lead-in box. However, various specific power distribution methods can be adopted, such as passing a low-voltage line through multiple utility poles and connecting the lead-in end branching from the pole to a switch or external insulating cleat.

[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.

The branch line is a composite branch line, so when there are a large number of branches, and when installing protection and use, the wire fuses can be connected to the desired branch line to install them in an orderly arrangement, so the storage rate will not be hindered. Also, maintenance of the fuse is 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 electric wire fuse is changed only at the drop-in line connection ill, the type of branch line can be unified, the production of a composite branch line is easy, and the on-site connection of the above electric wire fuse is possible. 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. is a perspective view of the internal structure of the branch lead-in box with the lid open; Figure 4 is a perspective view of the external insulating cleat with the cover removed; Figure 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 IJ1
．． ff electric wire 7...Low voltage line 7a...
Lead-in end 8... Lead-in line 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... Upper opening 25... Opening 26... Lid 27. ...Bushing

Claims (5)

[Claims] (1) A branch that can be mounted along a telephone 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. A 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 arranged separately in the through holes of the insulating cleat and built into the branch lead-in box, The screw terminal of the switch attached to the utility pole at the top of the branch lead-in box and connected to the secondary side 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, and the screw of the composite branch line is inserted into the branch lead-in box through the upper opening of the branch lead-in box. A low-voltage line branch/lead method that connects the terminal with screws and connects the drop-in line to the lower end of the branch line through the opening at the bottom of the branch-lead box. (2) A branch that can be mounted along a telephone 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. A lead-in box is provided, and 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. Alternatively, an external insulating cleat that can be attached to the branch lead-in box and hold the low-voltage wire lead-in ends separately arranged and clamped is provided, 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 branch lead-in. 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 the drop-in line is connected to the lower end of the desired branch line via an electric wire fuse. (4) A claim in which the electric wire fuse connected to the lower end of the branch line has a compression connection terminal on the branch line connection side having a constant diameter, and a compression connection terminal on the drop line connection side having at least two different diameters. Branching/drawing method of low voltage line described in 3. (5) The low-voltage line branching/drawing method according to claim 1 or 2, wherein a branching/drawing box having an opening with a lid for screwing work is used on the side surface of the upper part of the main body.