JP2022103177A - Cable with branch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable with a branch which is lightweight and can be branched into a plurality of branches from a trunk cable.

SOLUTION: A cable with a branch includes a trunk cable 20, two branch cables 30 that branch from the trunk cable, and a branch connector 40 that connects the branch cable to the trunk cable. The material of a conductor 21 of the trunk cable is made of aluminum or an aluminum alloy. Two branch line cables 30 are drawn from the branch connector 40. The branch connector 40 has connections 41 and 42 of the two branch line cables 30. The overall cross-sectional shape composed of the conductors of the two branch wire cables is a rounded shape without constriction. The material of the branch connector is aluminum or aluminum alloy, The conductor of the branch wire cable is copper or copper alloy. The conductors of the respective branch line cables are connected to the branch connector in a compressed connection state without any gaps without interposing other parts.

SELECTED DRAWING: Figure 11

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a cable with a branch.

A cable with a branch is known as a cable for supplying electric power to middle-high-rise buildings such as condominiums and office buildings. The branched cable includes a trunk line cable and a branch line cable branched from the trunk line cable (see, for example, Patent Document 1).
The main cable of the branch cable laid in the building or apartment has its upper end fixed near the top floor and suspended vertically, and the middle part is appropriately supported and fixed to the middle floor, and the main cable is In the switchboard, the branch line cable is drawn to each floor and connected to the electricity meter.

In recent years, especially at construction sites, labor saving and labor saving are required as the working population decreases and the population ages. Conventionally, copper or copper alloy is widely used for the conductor of the branched cable, but it is effective to use aluminum or aluminum alloy for the conductor of the branched cable for weight reduction and labor saving associated therewith. .. Products that realize this include a cable with a branch that uses an aluminum conductor as a trunk cable and a copper conductor as a branch cable (see, for example, Patent Document 2 and Non-Patent Document 1). This cable with branch is made lighter by adopting an aluminum conductor for the main cable, and by using a copper conductor cable as the branch line cable as before, the distribution board, distribution board, and electricity amount that are widely used today. It can be directly connected to equipment such as a meter.

Japanese Unexamined Patent Publication No. 5-282935 Japanese Unexamined Patent Publication No. 2016-152089

Electricity and Construction, Ohmsha, January 2018, p. 49

As a connector used for a cable with a branch using an aluminum conductor for a trunk line (hereinafter, a cable with an aluminum conductor branch), a branch connector 40 dedicated to the aluminum conductor (see, for example, FIG. 5) is used. The branch connector 40 has a groove-shaped recess 42 for accommodating the conductor of the trunk cable and a groove-shaped recess 41 for accommodating the conductor of the branch cable. It is assumed that one conductor is housed in each of these recesses 41 and 42.
For this reason, if there are two electricity meters on the same floor, two cables with aluminum conductor branches are required, which doubles the work load and the required number of workers, and the floor for passing the main cable. There was a problem that it was necessary to enlarge the through hole or open two holes.

An object of the present invention is to provide a cable with a branch which is lightweight and can be branched into a plurality of branches from the same location of a trunk cable.

The present invention
With the main cable,
Two branch line cables branching from the trunk line cable and
A cable with a branch provided with a branch connector for connecting the branch line cable to the trunk line cable.
The material of the conductor of the trunk cable is aluminum or an aluminum alloy.
Two of the branch line cables are pulled out from one of the branch connectors.
The branch connector has a connection portion to which the two branch line cables are connected.
The overall cross-sectional shape consisting of the conductors of the two branch wire cables is a rounded shape without constriction.
The material of the branch connector is aluminum or an aluminum alloy.
The conductor of the branch wire cable is copper or a copper alloy.
It is characterized in that the conductors of the respective branch line cables are connected to the branch connector in a compressed connection state without any gap.

According to the present invention, it is possible to reduce the weight and the work load at the time of laying, and it is possible to provide a branched cable capable of good connection and a connection method thereof.

It is an external view which shows the cable with a branch of 1st Embodiment. It is a perspective view of the cable with a branch which shows the place where two branch line cables are branched and connected to a trunk line cable. It is a perspective view of the cable with a branch which shows the state which the branch connection part is resin-sealed. It is a side view which shows the shape seen from the axis direction of the trunk line cable of the branch connector in the state before cable connection. It is a side view which shows the other shape example seen from the axial direction of the trunk line cable of the branch connector in the state before cable connection. It is a perspective view of the branching cable which shows the place where two branch line cables are branched and connected to the trunk line cable of the branching cable of 2nd Embodiment. It is a perspective view of the branching cable which shows the state which the branching connection part of the branching cable of 2nd Embodiment is resin-sealed. It is sectional drawing in the axial direction of the 2nd relay conductor. FIG. 9A is an explanatory diagram of the arrangement of the conductor of the trunk cable and the conductors of the two branch line cables with respect to the branch connector immediately before the compression connection in the cable with branch of the third embodiment as viewed from the axial direction, and FIG. 9A is shown. 9 (B) and 9 (C) show a state in which two conductors are lined up in the vertical direction of the above, and FIGS. 9 (B) and 9 (C) show a state in which the two conductors are lined up in an inclined direction. 10 (A) to 10 (C) show the cross-sectional shapes of the two conductors and the branch connector after the compression connection in each of the arrangements of FIGS. 9 (A) to 9 (C) described above. It is sectional drawing of two conductors after compression connection in FIG. 10A. It is a perspective view which shows the state which bundled the conductors of two branch line cables with a bind line. It is a perspective view which shows the state which put together the conductors of two branch line cables with a die. It is a perspective view which shows the state which two branch line cables are pulled out individually on both sides in the cable axis direction with respect to a branch connector. It is explanatory drawing which shows the laying example in the state that two branch line cables are pulled out individually on both sides in the cable axis direction with respect to a branch connector. It is a perspective view which shows the state which four branch line cables are pulled out two each on both sides in the cable axis direction with respect to a branch connector.

Hereinafter, embodiments of the cable with branch according to the present invention will be described in detail with reference to the drawings. However, although the embodiments described below are provided with various technically preferable limitations for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

[First Embodiment]
FIG. 1 is an external view showing a cable with a branch of the first embodiment.
As shown in FIG. 1, the cable 100 with a branch includes, for example, a trunk cable 20, a plurality of branch line cables 30, a branch connector 40 for branching and connecting a plurality of branch line cables 30 from the trunk cable 20, and each cable 20. , 30 and a resin molded body 60 (see FIG. 3) for sealing the exposed portion of the branch connector 40.
In this embodiment, an example of laying the cable 100 with a branch for supplying electric power to a building having a plurality of layers is shown. Further, although the configuration in which two branch line cables 30 are connected to the trunk line cable 20 for each floor is illustrated here, the number of branches of the branch line cable 30 from one place may be larger.

One end of the trunk cable 20 is suspended on the top floor of the building via a hanging jig (not shown). The middle portion of the trunk cable 20 may be appropriately supported and fixed to the wall surface of each floor or the like.
Further, the other end of the trunk cable 20 is connected to a switchboard (not shown) which is a power source for supplying electric power to the building.
One end of each branch line cable 30 is connected to the trunk line cable 20 via a branch connector 40 provided for each floor, and the other end is individually connected to the watt hour meter 50.

[Main cable]
FIG. 2 is a perspective view of a branched cable 100 showing a portion where two branched wire cables 30 are branched and connected to the trunk cable 20, and FIG. 3 is a perspective view showing a state in which the same portion is sealed by a resin molded body 60. It is a figure.
The trunk cable 20 includes a conductor 21 located at the center of the cable and an insulating layer 22 covering the conductor 21.
Aluminum or an aluminum alloy is used as the material of the conductor 21.
The conductor 21 is formed by twisting a plurality of strands. For example, the conductor 21 is a conductor having a cross-sectional area of 100 [mm ² ]. The cross-sectional area is an example, and its size can be changed.
As the material of the insulating layer 22, an insulating material, for example, cross-linked polyethylene is used. The outer periphery of the insulating layer 22 may be covered with a sheath (not shown).

[Branch line cable]
The branch line cable 30 includes a conductor 31 located at the center of the cable and an insulating layer 32 covering the conductor 31.
Copper or a copper alloy is used as the material of the conductor 31.
The conductor 31 is formed by twisting a plurality of strands. For example, the conductor 31 is a conductor having a cross-sectional area of 14 [mm ² ]. The cross-sectional area is an example, and its size can be changed. However, as the conductor 31 of the branch line cable 30, one having a cross-sectional area smaller than that of the trunk line cable 20 is selected.
As the material of the insulating layer 32, an insulating material, for example, cross-linked polyethylene is used. The outer periphery of the insulating layer 32 may also be covered with a sheath (not shown).

[Branch connector]
FIG. 4 is a side view showing the shape of the trunk cable 20 of the branch connector 40 in a state before cable connection as seen from the axial direction, and FIG. 5 is a side view showing another shape example of the branch connector 40.
The branch connector 40 is a block made of aluminum or an aluminum alloy having a continuous shape shown in FIG. 4 over the entire length in the cable axial direction (longitudinal direction) before the cable is connected. Recesses 41 and 42 as groove-shaped connecting portions for accommodating the cable conductor are formed on the lower side and the upper side of the branch connector 40 over the entire length in the axial direction.

The trunk cable 20 is connected by accommodating the conductor 21 in a state where the insulating layer 22 is removed and exposed in the middle portion in the axial direction in one recess 42 of the branch connector 40.
On the other hand, the branch line cable 30 is connected to the branch connector 40 via the first relay conductor 33 in order to ensure good connection between the two conductors 31.

That is, the conductors 31 of the two branch wire cables 30 in a state where the insulating layer 32 is removed and exposed at the connection end are arranged in the same direction, and together with one end of the first relay conductor 33, a so-called fastener. The two conductors 31 and the first relay conductor 33 are electrically connected by being bundled by a crimp connection using a T-shaped connector 34 or the like. If the two conductors 31 and the first relay conductor 33 can be electrically connected, not only the T-type connector 34 but also a member (sleeve or the like) corresponding to another connector may be used.
The other end of the first relay conductor 33 extends farther than the extending direction of the two conductors 31, and the other end is housed in the other recess 41 of the branch connector 40. And the connection is made. That is, the conductor 31 of each branch line cable 30 is not directly connected to the branch connector 40, but is indirectly connected via the first relay conductor 33.

The first relay conductor 33 is a bare stranded wire made of copper or a copper alloy. Since the current flows through the two conductors 31 in the first relay conductor 33, if the materials of the first relay conductor 33 and the conductor 31 are the same, the cross-sectional area of one conductor 31 (axis vertical cross section). The one having a cross-sectional area (axis vertical cross-section) more than twice that of is used. For example, when it is desired to connect a large number of branch line cables 30 to one branch connector 40, a first relay conductor 33 having a cross-sectional area that is several times or more the cross-sectional area of one conductor 31 is used.
The first relay conductor 33 does not have to be a stranded wire. For example, a rod-shaped body made of a conductor material having the above cross-sectional area may be used.
In the present specification, the cross-sectional area of a conductor is the cross-sectional area of a vertical cross section, and when the conductor consists of a stranded wire obtained by twisting a plurality of strands, each strand is broken. It shall show the cross-sectional area which is the sum of all the areas.

Then, the branch connector 40 is pressurized from both the top and bottom in FIG. 4 by a die (not shown), and the conductor 21 of the trunk cable 20 and the first relay conductor 33 are connected by a compression connection.
At this time, since the branch connector 40 is made of aluminum or an aluminum alloy and the first relay conductor 33 is made of copper or a copper alloy, contact between dissimilar metals may cause contact corrosion of dissimilar metals. For this reason, the resin molded body 60 prevents the ingress of moisture, and further, the metal fine particles having conductivity (for example, zinc fine particles) are further between the recess 41 of the branch connector 40 and the first relay conductor 33. ) And a conductive compound composed of a mixture containing viscous grease (mineral oil grease, silicone grease or other grease in general or mineral oil) can further prevent the infiltration of water. Further, since this compound also has effects such as destruction of the oxide film of aluminum and prevention of regeneration, it is preferable to interpose it between the recess 42 of the branch connector 40 and the conductor 21 of the trunk cable 20.
Further, when the above-mentioned T-shaped connector 34 is made of aluminum or an aluminum alloy, it may be interposed between the T-shaped connector 34 and the conductor 31 of each branch line cable 30 and the first relay conductor 33. preferable.

As shown in FIG. 5, the branch connector 40 may have a structure in which one recess 42 (or both recesses 41, 42) is opened sideways instead of in the vertical direction.

[Resin molded product]
The resin molded body 60 seals the conductor 21 of the exposed trunk cable 20, the conductor 31 of the branch line cable 30, the branch connector 40, the first relay conductor 33, and the T-shaped connector 34 with an insulating resin. It will be. The resin molded body 60 can insulate the branch connection portion of the trunk cable 20 and the branch line cable 30 and protect it from external physical impact, dust, moisture and the like.

[Technical effect of the first embodiment]
In the branch cable 100 of the first embodiment, the material of the conductor 21 of the trunk cable 20 is aluminum or an aluminum alloy, and a plurality of (for example, two) branch line cables 30 are drawn out from one branch connector 40. It is a structure. Therefore, it is possible to reduce the weight of the branch cable 100. Further, when it is desired to draw out a plurality of branch line cables 30 from a specific place to be laid, for example, when it is desired to draw out a plurality of branch line cables 30 for each floor of a building, a plurality of cables with branches are laid. This eliminates the need, effectively reduces the work load and the required number of workers, and avoids the expansion of floor through holes and the increase in the number of holes for passing trunk cables.

Further, since the material of the branch connector 40 is aluminum or an aluminum alloy, it is the same as or similar to the material of the conductor 21 of the trunk cable 20, so that the occurrence of contact corrosion of dissimilar metals in the conductor 21 of the trunk cable 20 is suppressed and the cable with branch is used. It is possible to maintain a high durability of 100.

Further, since each branch line cable 30 is drawn out from the branch connector 40 in the same direction along the axis direction, each branch line cable 30 is aligned with the trunk line cable 20 in the same direction or on the same axis vertical plane. When laying, it becomes easy to arrange each branch line cable 30, and it becomes easy to secure a laying space.

Further, although the conductor 31 of each branch line cable 30 is made of copper or a copper alloy, in many of the power meters that are widely used at present, the connection terminals are made of copper or a copper alloy, and in that case, dissimilar metal contact is made. It is possible to avoid the occurrence of corrosion and maintain high durability of the branched cable 100.
Further, the connection destination of the branch line cable 30 is not limited to the watt-hour meter, and may be connected to, for example, a distribution board, but the connection terminal of the distribution board currently widely used is also copper or a copper alloy. In many cases, it is made of product, and it is possible to obtain the same effect.

Further, in the cable 100 with branching, the conductors 31 of the two branch line cables 30 and the first relay conductor 33 having a cross-sectional area equal to or larger than the total cross-sectional area of these conductors 31 are bundled by the T-type connector 34, and the first one is used. The conductors 31 of the two branch line cables 30 are indirectly connected to the branch connector 40 via the relay conductor 33.
Since the first relay conductor 33 is a conductor that is integrated into a single circle, the pressure from the surroundings is uniformly transmitted in the process of applying pressure such as compression or crimping to the branch connector 40, reducing the possibility of creating gaps and the like. This makes it possible to satisfactorily connect each branch line cable 30 to the main line cable 20.

[Second Embodiment]
The branch cable 100A of the second embodiment will be described with reference to the drawings. Regarding the cable 100A with branch, the same configuration as the cable 100 with branch described above is designated by the same reference numeral, and the overlapping description will be omitted, and the points different from the cable 100 with branch will be mainly described.
FIG. 6 is a perspective view of a branched cable 100A showing a portion where two branched wire cables 30 are branched and connected to the trunk cable 20, and FIG. 7 is a perspective view showing a state in which the same portion is sealed by the resin molded body 60. It is a figure.
Similar to the above-mentioned branched cable 100, the branched cable 100A has a plurality of branched cables 30 branched and connected at various points of the trunk cable 20 as shown in FIG.

In the above-mentioned cable with branch 100, the conductor 31 of the two branch line cables 30 and the first relay conductor 33 are bundled by the T-shaped connector 34 and connected to the branch connector 40 via the first relay conductor 33. However, the branch cable 100A exemplifies a configuration including a second relay conductor 33A that bundles the conductors 31 of the two branch line cables 30 and connects them to the branch connector 40.

FIG. 8 is an axial sectional view of the second relay conductor 33A. As shown in the figure, the second relay conductor 33A is provided with a tubular inserted portion 331A into which the conductors 31 of the two branch line cables 30 can be inserted at one end thereof, and the concave portion of the branch connector 40 at the other end. A columnar insertion portion 332A that can be inserted into 41 is provided, and these are integrally formed of the same material. Here, the case where the second relay conductor 33A is made of copper or a copper alloy is exemplified.

The second relay conductor 33A is compression-connected or crimp-connected with each conductor 31 inserted in the inserted portion 331A, whereby the two conductors 31 and the second relay conductor 33A are electrically connected. The connection has been made.
Further, the second relay conductor 33A is compressed and connected with the insertion portion 332A inserted into the recess 41 of the branch connector 40, whereby the branch connector 40 and the two conductors are connected via the second relay conductor 33A. An electrical connection with 31 is made.

Since the insertion portion 332A of the second relay conductor 33A allows current to flow through the two conductors 31, if the material of the insertion portion 332A of the second relay conductor 33A and the material of the conductor 31 are the same, one conductor Those having a cross section (axis vertical cross section) that is at least twice the cross section (axis vertical cross section) of 31 are used. Also in this case, when it is desired to connect a large number of branch line cables 30 to one branch connector 40, an insertion portion 332A having a cross-sectional area that is several times or more the cross-sectional area of one conductor 31 is used.

Also in this case, since the branch connector 40 is made of aluminum or an aluminum alloy and the second relay conductor 33A is made of copper or a copper alloy, the recess 41 of the branch connector 40 and the second relay are used to prevent contact corrosion between different metals. It is preferable to interpose the above-mentioned compound with the conductor 33A.

The branch connector 40 in which the conductor 21 of the trunk cable 20 and the second relay conductor 33A are compression-connected is the conductor 21 and the branch line of the trunk cable 20 exposed by the resin molded body 60 as in the case of the cable with branch 100. It is sealed together with the conductor 31 of the cable 30 and the second relay conductor 33A.

The branch cable 100A having the above configuration also has the same technical effect as the branch cable 100 described above.
Further, in the cable with branch 100A, the conductor 31 of each branch line cable 30 is connected to the branch connector 40 via the second relay conductor 33A, and since the insertion portion 332A is a columnar conductor, the first relay conductor It is possible to suppress the generation of gaps as well as or more than 33, and to connect each branch line cable 30 to the main line cable 20 satisfactorily.
Further, since the second relay conductor 33A can be compressed and connected by inserting the conductor 31 of each branch line cable 30, the connection work can be performed more easily, and the overall laying work efficiency can be improved.

[Third Embodiment]
The cable with branch 100B of the third embodiment will be described with reference to the drawings. Regarding the cable 100B with branch, the same configuration as the cable 100 with branch described above is designated by the same reference numeral, and the duplicate description is omitted, and the points different from the cable 100 with branch will be mainly described.
Unlike the above-mentioned branched cable 100, this branched cable 100B is a conductor of a plurality of branched cable 30s from the same direction in the cable axis direction in the recess 41 of the branched connector 40 without using the first relay conductor 33. It is characterized in that 31 is arranged and directly connected by a compression connection.

FIG. 9 is an explanatory diagram of the arrangement of the conductor 21 of the trunk cable 20 and the conductor 31 of the two branch line cables 30 with respect to the branch connector 40 in the state immediately before the compression connection as viewed from the axial direction.
9 (A) shows a state in which two conductors 31 are lined up in the vertical direction (direction in which the conductor 21 and the conductor 31 are lined up) in the drawing, and FIGS. 9 (B) and 9 (C) are shown in the vertical direction in the drawing. The state in which they are inclined and lined up in each of the left and right directions shown in the figure is shown. Although it is possible to make a compression connection between the two conductors 31 in a state where they are arranged side by side in the left-right direction in the drawing, the illustration is omitted here.

As described above, when the two conductors 31 are directly connected to the branch connector 40, the cross-sectional shape is such that the two circles are lined up by point contact, and there is a possibility that a gap or the like may occur between the branch connectors 40. Occurs.
Therefore, in the cable with branch 100B, the pressing force at the time of compression connection of the branch connector 40 is adjusted, and the cross-sectional shape of the axial vertical cross section of the two conductors 31 after compression connection is not a point contact but a wider range. It is configured to have a shape that makes contact with.

10 (A) to 10 (C) show the cross-sectional shapes of the two conductors 31 and the branch connector 40 after the compression connection in each of the arrangements of FIGS. 9 (A) to 9 (C) described above. .. Note that the conductor 21 is not shown in FIGS. 10 (A) to 10 (C). Further, FIG. 11 is a cross-sectional view of the two conductors 31 after the compression connection in FIG. 10 (A).
In the arrangement of FIG. 9A, the two conductors 31 are arranged so as to be arranged in the same direction as the arrangement direction of the two recesses 41 and 42 of the branch connector 40, and compression is performed.

The above-mentioned compound is applied so as to be interposed between the recess 41 of the branch connector 40 and the two conductors 31.
In each of FIGS. 10A to 10C, the gap between the two conductors 31 and the branch connector 40 illustrates a state in which the compound is inserted.

As shown in the figure, in the cross section of the conductor 31 of the two branch line cables 30 after the compression connection, the width W of the portion t where the adjacent conductors 31 are in contact with each other is outside the conductor 31 of the branch line cable 30 before the connection. The diameter is at least 10% or more, or 20% or more, preferably 30% or more, more preferably 40% or more, still more preferably 50% or more, and further 60% or more. Further, it is even better to set it to 70% or more, 80% or more, and 90% or more.
Although FIG. 11 shows only the state after the compression connection by the conductor arrangement of FIG. 10 (A), the conductors 31 are in contact with each other even in the case of the conductor arrangement of FIGS. 10 (B) and 10 (C). The width W of the portion t is an appropriate width as described above.

In this way, the width W of the contacted portion t in the cross-sectional shape of the two conductors 31 has an appropriate width, so that the conductors 31 are connected to the branch connector 40 with their boundaries widely in contact with each other. Therefore, it is possible to suppress the occurrence of a gap generated between the conductors 31 and the branch connector 40 because the width W of the contacted portion t between the conductors 31 is too narrow. Therefore, it is possible to effectively reduce the occurrence of a poor connection due to the occurrence of a gap, which is a concern when the two conductors 31 are directly connected to the branch connector 40.

Further, as shown in FIG. 12, the conductor 31 of the two branch wire cables 30 is bundled with the bind wire 35 as a restraint for fastening and restraining the two conductors 31 with respect to the branch connector 40. You may make a compressed connection. In this case, it is preferable that the bind wire 35 is attached to the tip of the conductor 31 drawn out from the insulating layer 32 and the end closer to the insulating layer 32 so as to avoid the branch connector 40. Further, the bind wire 35 may be removed after the compression connection.
In this way, by connecting the conductors 31 to the branch connector 40 in a bundled state by the bind wires 35, it is possible to suppress the generation of gaps between the conductors 31 and make a good connection.

Further, as shown in FIG. 13, the conductors 31 of the two branch wire cables 30 are compressed and connected to the branch connector 40 in a state where they are previously fitted into a mold such as a die 36 and pressure is applied to combine them into one. May be done. In this case, it is preferable that the die 36 has a shape in which the two conductors 31 are solidified into one columnar shape.
In this way, by connecting the conductors 31 to the branch connector 40 in a state of being gathered together by the dice 36, it is possible to suppress the generation of gaps between the conductors 31 and make a good connection. In addition, both the bind wire 35 and the die 36 described above may be used in combination.

Further, as shown in FIG. 14, the conductor 31 of the two branch line cables 30 may be pulled out in both directions in the cable axis direction with respect to the branch connector 40. That is, the conductor 31 of the branch line cable 30 from one of the axial directions is arranged with respect to the recess 41 of the branch connector 40, and the conductor 31 of the other branch line cable 30 from the other in the axial direction is arranged with respect to the recess 41. Deploy. Then, these are connected by a compression connection.

By pulling out the branch line cable 30 from the branch connector 40 in both axial directions in this way, for example, as shown in FIG. 15, a watt-hour meter that becomes a power supply destination along the cable axis direction of the trunk cable 20. When a plurality of 50s are arranged side by side, the laying length of each branch line cable 30 can be shortened while minimizing the number of branch connectors 40, enabling efficient wiring and work at the time of laying. It is possible to reduce the burden and cost.

Further, as shown in FIG. 16, the number of branch line cables 30 drawn out on both sides of the branch connector 40 in the axial direction may not be one by one, but a larger number may be drawn out. In this case, the branch line cable 30 can be laid toward more power supply destinations (electric energy meter 50).

It is possible to pull out the branch line cable 30 on both sides of the branch connector 40 in the axial direction in the same manner for the above-mentioned branched cables 100 and 100A.
For example, in the case of the cable with branch 100, the first relay conductor 33 is made sufficiently longer than the branch connector 40 so that it can be pulled out from both sides in the axial direction of the branch connector 40, and the T-shaped connector 34 is used on both sides thereof. The conductor 31 of each branch line cable 30 may be connected individually. In this case, the cross-sectional area of the first relay conductor 33 should be equal to or greater than the total cross-sectional area of the conductors 31 of all the branch line cables 30 connected to both sides.
Further, in the case of the cable with branch 100A, the inserted portions 331A may be formed at both ends of the insertion portion 332A so that the conductors 31 of the branch line cable 30 can be connected from both sides. Also in this case, the cross-sectional area of the insertion portion 332A of the second relay conductor 33A should be equal to or larger than the total cross-sectional area of the conductors 31 of all the branch line cables 30 connected to both sides.

[others]
In each of the above embodiments, the outer diameters of the various conductors 21 and 31 and the number of strands are examples, and can be changed as appropriate.
In addition, it goes without saying that the specific detailed structure and the like can be changed as appropriate.

For example, in each of the above embodiments, the case where the conductor 31 of the branch wire cable 30 is copper or a copper alloy is exemplified, but the branch wire cable 30 in which the conductor 31 is aluminum or an aluminum alloy may be used.

20 Trunk cable 21 Conductor 22 Insulation layer 30 Branch line cable 31 Conductor 32 Insulation layer 33 First relay conductor 33A Second relay conductor 331A Inserted part 332A Inserted part 34 T-type connector (fastener)
35 Bind line (restraint)
36 Dice 40 Branch connector 41, 42 Concave part (connection part)
50 Electric energy meter 60 Resin molded body 100, 100A, 100B Cable with branch t Part where conductors are in contact W Width of part where conductors are in contact

Claims (3)

With the main cable,
Two branch line cables branching from the trunk line cable and
A cable with a branch provided with a branch connector for connecting the branch line cable to the trunk line cable.
The material of the conductor of the trunk cable is aluminum or an aluminum alloy.
Two of the branch line cables are pulled out from one of the branch connectors.
The branch connector has a connection portion to which the two branch line cables are connected.
The overall cross-sectional shape consisting of the conductors of the two branch wire cables is a rounded shape without constriction.
The material of the branch connector is aluminum or an aluminum alloy.
The conductor of the branch wire cable is copper or a copper alloy.
A cable with a branch, characterized in that the conductors of the respective branch line cables are connected to the branch connector in a compressed connection state without interposing other parts. The cable with a branch according to claim 1, wherein all of the plurality of branch line cables connected to the one branch connector are drawn out from the branch connector in the same direction. The branch according to claim 1, wherein a part of the branch line cable connected to the branch connector and the remaining part of the branch line cable are drawn out from the branch connector in both directions, respectively. cable.

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