JP7317172B2 - Cable with branch - Google Patents

Description

The present invention relates to a branched cable.

A cable with a branch is known as a cable that supplies power to mid-to-high-rise buildings such as condominiums and office buildings. The branched cable has a trunk cable and a branch line cable branched from the trunk cable (see Patent Document 1, for example).
The branched trunk cables installed in buildings and condominiums have their upper ends fixed near the top floor and suspended vertically. In the switchboard, the branch line cables are led to each floor and connected to the electricity meters respectively.

In recent years, particularly at construction sites, labor-saving and labor-saving are required due to the decrease and aging of the working population. Conventionally, copper or copper alloys have been widely used for the conductors of branched cables, but it is effective to use aluminum or aluminum alloys for the conductors of branched cables in order to reduce weight and reduce the associated labor costs. . As a product that achieves this, there is a branch cable using an aluminum conductor for the trunk cable and a copper conductor for the branch line cable (see, for example, Patent Document 2 and Non-Patent Document 1). This branched cable uses aluminum conductors for the trunk cable to reduce weight, while the conventional branch cable is made of copper conductor cable. It can be directly connected to equipment such as a meter.

JP-A-5-282935 JP 2016-152089 A

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

A branch connector 40 (for example, see FIG. 5) dedicated to aluminum conductors is used as a connector used for a cable with a branch using an aluminum conductor as a trunk line (hereinafter referred to as a cable with a branch of an aluminum conductor). 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 accommodated in each of these recesses 41 and 42 .
Therefore, if there are two watt-hour meters on the same floor, two cables with aluminum conductor branches are required, which doubles the work load and the number of workers required. Problems such as the need to increase the size of the through-hole or open two through-holes have arisen.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a branched cable which is lightweight and capable of branching into a plurality of branches from the same portion of a trunk cable.

The present invention
trunk cable and
two branch line cables branching from the trunk cable;
A branched cable comprising a branch connector for connecting the branch line cable to the trunk cable,
The material of the conductor of the trunk cable is aluminum or an aluminum alloy,
Two branch line cables are pulled out from one branch connector,
The branch connector has a connecting portion to which the two branch line cables are connected,
The overall cross -sectional shape of the inner portion of the connecting portion of the conductors of the two branch line cables is a rounded shape without a constriction,
A material of the branch connector is aluminum or an aluminum alloy,
The conductor of the branch line cable is copper or a copper alloy,
The conductors of each of the branch cables are connected to the branch connector in a compressed connection state with no gaps without interposing other parts,
A cross-section of the conductors of the two branch cables after compression connection has a linear portion where boundaries between the adjacent conductors are in contact with each other.

Advantageous Effects of Invention According to the present invention, it is possible to provide a cable with a branch and a method for connecting the same, which can reduce the weight and reduce the work load during installation, and which enables good connection.

1 is an external view showing a branched cable according to a first embodiment; FIG. FIG. 4 is a perspective view of a branched cable showing a location where two branch line cables are branched and connected to a trunk cable; FIG. 10 is a perspective view of the branched cable showing a state in which a branch connection location is resin-sealed; FIG. 4 is a side view showing the shape of the branch connector before cable connection as seen from the axial direction of the trunk cable; FIG. 11 is a side view showing another example of the shape of the branch connector before cable connection, viewed from the axial direction of the trunk cable; FIG. 10 is a perspective view of a branched cable showing a portion where two branched cables are branched and connected to a trunk cable of the branched cable according to the second embodiment; FIG. 10 is a perspective view of a branched cable showing a state in which a branch connection portion of the branched cable according to the second embodiment is resin-sealed; FIG. 4 is an axial cross-sectional view of a second relay conductor; FIG. 9A is an explanatory view of the arrangement of the conductors of the trunk cable and the conductors of the two branch cables with respect to the branch connector immediately before compression connection in the cable with branch of the third embodiment, as viewed from the axial direction; FIG. 9(B) and 9(C) show the state in which two conductors are arranged in the vertical direction, and the state in which the conductors are arranged in an inclined direction. 10(A) to 10(C) show cross-sectional shapes of two conductors and branch connectors after compression connection in each of the arrangements of FIGS. 9(A) to 9(C) described above. Fig. 10(B) is a cross-sectional view of the two conductors after compression connection in Fig. 10(A); FIG. 4 is a perspective view showing a state in which conductors of two branch line cables are bundled with binding wires; FIG. 4 is a perspective view showing a state in which conductors of two branch line cables are combined into one by a die; FIG. 4 is a perspective view showing a state in which two branch cables are individually pulled out to both sides in the cable axial direction with respect to the branch connector; FIG. 10 is an explanatory diagram showing an example of installation in which two branch cables are separately pulled out on both sides in the cable axial direction with respect to the branch connector; FIG. 4 is a perspective view showing a state in which four branch cables are pulled out two by two on both sides in the cable axial direction with respect to the branch connector.

An embodiment of a branched cable according to the present invention will be described in detail below with reference to the drawings. However, although various technically preferable limitations are attached to the embodiments described below in order to carry 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 the branched cable 100 of the first embodiment.
For example, as shown in FIG. , 30 and a resin molded body 60 (see FIG. 3) for sealing the exposed portions of the branch connector 40. As shown in FIG.
In this embodiment, an example of installation of a branch cable 100 for supplying electric power to a building consisting of a plurality of stories is shown. Also, here, a configuration in which two branch line cables 30 are connected to the trunk cable 20 for each floor is exemplified, but the number of branches of the branch line cable 30 from one location may be increased.

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

[Trunk cable]
FIG. 2 is a perspective view of the branched cable 100 showing a location where two branch cables 30 are branched and connected to the trunk cable 20, and FIG. It is a diagram.
The trunk cable 20 includes a conductor 21 located in 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 with a cross-sectional area of 100 [mm ² ]. Note that the cross-sectional area is an example, and its size can be changed.
An insulating material such as crosslinked polyethylene is used as the material of the insulating layer 22 . The insulating layer 22 may be covered with a sheath (not shown) on its periphery.

[Branch line cable]
The branch line cable 30 includes a conductor 31 located in 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 with a cross-sectional area of 14 [mm ² ]. Note that the cross-sectional area is an example, and its size can be changed. However, the conductor 31 of the branch line cable 30 is selected to have a cross-sectional area smaller than that of the trunk cable 20 .
An insulating material such as crosslinked polyethylene is used as the material of the insulating layer 32 . The insulating layer 32 may also be covered with a sheath (not shown) on its outer periphery.

[Branch connector]
FIG. 4 is a side view showing the shape of the branch connector 40 before cable connection as seen from the axial direction of the trunk cable 20, and FIG. 5 is a side view showing another shape example of the branch connector 40. As shown in FIG.
The branch connector 40 is a block made of aluminum or an aluminum alloy that continues the shape shown in FIG. 4 over the entire length in the cable axial direction (longitudinal direction) before cable connection. On the lower and upper sides of the branch connector 40 in the drawing, concave portions 41 and 42 are formed over the entire length in the axial direction as groove-like connection portions for accommodating the cable conductors.

The trunk cable 20 is connected by removing the insulating layer 22 at an intermediate portion in the axial direction, and the exposed conductor 21 is accommodated in one concave portion 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 achieve good connection between the two conductors 31 .

That is, the conductors 31 of the two branch line cables 30 exposed by removing the insulating layer 32 at the connection ends are arranged in the same direction, and together with one end of the first relay conductor 33, a so-called fastener is attached. The two conductors 31 and the first relay conductor 33 are electrically connected by bundling them by crimp connection using a T-shaped connector 34 or the like as the conductor. In addition, as long as the two conductors 31 and the first relay conductor 33 can be electrically connected, not only the T-shaped connector 34 but also other connector-equivalent member (sleeve, etc.) may be used.
The other end of the first relay conductor 33 extends farther than the direction in which the two conductors 31 extend, and is accommodated in the other concave portion 41 of the branch connector 40. connection is established. In other words, 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 twisted wire made of copper or copper alloy. Since current flows through the first relay conductor 33 for the two conductors 31, if the materials of the first relay conductor 33 and the conductor 31 are the same, the cross-sectional area (axial vertical cross section) of the single conductor 31 is A cross-sectional area (axis-perpendicular cross-section) twice or more of is used. For example, when it is desired to connect a large number of branch cables 30 to one branch connector 40, the first relay conductor 33 having a cross-sectional area equal to or more than the cross-sectional area of one conductor 31 is used.
This first relay conductor 33 may not be a stranded wire. For example, a rod-shaped body made of a conductive material having the above cross-sectional area may be used.
In this specification, the cross-sectional area of a conductor means the cross-sectional area of a cross section perpendicular to the axis, and when the conductor is a stranded wire obtained by twisting a plurality of strands, the cross section of each strand The cross-sectional area obtained by summing up all the areas shall be indicated.

The branch connector 40 is pressed by dies (not shown) from above and below in FIG. 4, and the conductor 21 of the trunk cable 20 and the first relay conductor 33 are connected by 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, there is a possibility that contact between dissimilar metals may cause galvanic corrosion. For this reason, the resin molded body 60 prevents the intrusion of moisture, but furthermore, between the concave portion 41 of the branch connector 40 and the first relay conductor 33, there is a conductive metal fine particle (for example, a zinc fine particle). ) and viscous grease (mineral oil grease, silicone grease, other greases in general, or mineral oil) is interposed to further prevent water from entering. In addition, since this compound also has the effect of preventing breakage and regeneration of the aluminum oxide film, it is preferable to interpose it between the recess 42 of the branch connector 40 and the conductor 21 of the trunk cable 20 .
Furthermore, when the T-shaped connector 34 described above is made of aluminum or an aluminum alloy, it can also 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 and 42) is open laterally rather than vertically.

[Resin molding]
The resin molding 60 seals the exposed conductor 21 of the trunk cable 20, the conductor 31 of the branch cable 30, the branch connector 40, the first relay conductor 33, and the T-shaped connector 34 with insulating resin. become. The resin molded body 60 can insulate the branch connection portion of the trunk cable 20 and the branch 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 pulled out from one branch connector 40. It is a structure that Therefore, it is possible to reduce the weight of the branched cable 100 . Furthermore, for example, when it is desired to draw out a plurality of branch line cables 30 from a specific place where they are laid, such as 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 number of workers required, and makes it possible to avoid enlarging the floor through holes and increasing the number of holes for passing trunk cables.

In addition, since the material of the branch connector 40 is aluminum or aluminum alloy, it is the same as or similar to the material of the conductor 21 of the trunk cable 20, so the occurrence of galvanic corrosion in the conductor 21 of the trunk cable 20 is suppressed, and the cable with branch It is possible to maintain a high durability of 100.

In addition, since each branch line cable 30 is pulled out from the branch connector 40 in the same direction along the axial direction, each branch line cable 30 is pulled out from the trunk cable 20 in the same direction or in the same axial vertical plane. The arrangement of each branch line cable 30 is facilitated when laying, and the laying space can be easily secured.

In addition, although the conductor 31 of each branch cable 30 is made of copper or a copper alloy, the connection terminals of current widely used watt-hour meters are often made of copper or a copper alloy. It is possible to avoid the occurrence of corrosion and maintain high durability of the branched cable 100 .
Moreover, 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. In many cases, it is possible to obtain a similar effect.

In the cable with branch 100, the conductors 31 of the two branch 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 with the T-shaped connector 34, and the first The conductors 31 of the two branch line cables 30 are indirectly connected to the branch connector 40 via the relay conductors 33 .
Since the first relay conductor 33 is a circular conductor, 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 a gap. It is possible to connect each branch line cable 30 to the trunk cable 20 satisfactorily.

[Second embodiment]
A branch cable 100A of the second embodiment will be described with reference to the drawings. Regarding this cable with branch 100A, the same components as those of the cable with branch 100 described above are denoted by the same reference numerals, and overlapping descriptions are omitted, and differences from the cable with branch 100 are mainly described.
FIG. 6 is a perspective view of a branch cable 100A showing a location where two branch cables 30 are branched and connected to a trunk cable 20, and FIG. 7 is a perspective view showing the location sealed with a resin molding 60. It is a diagram.
In this branched cable 100A, as in the branched cable 100 described above, a plurality of branch line cables 30 are branched and connected at various locations of the trunk cable 20 as shown in FIG.

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

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

In the second relay conductor 33A, compression connection or crimp connection is performed with each conductor 31 inserted into the inserted portion 331A, thereby electrically connecting the two conductors 31 and the second relay conductor 33A. A connection is being made.
In addition, the second relay conductor 33A is compression-connected with the insertion portion 332A inserted into the concave portion 41 of the branch connector 40, thereby connecting the two conductors to the branch connector 40 via the second relay conductor 33A. 31 are electrically connected.

In addition, since the current flows through the insertion portion 332A of the second relay conductor 33A to the two conductors 31, if the material of the insertion portion 332A of the second relay conductor 33A and the conductor 31 are the same, one conductor Those having a cross-sectional area (axis-perpendicular cross-section) twice or more that of 31 (axis-perpendicular cross-section) are used. Also in this case, when it is desired to connect a large number of branch cables 30 to one branch connector 40, the insertion portion 332A having a cross-sectional area equal to or more than the cross-sectional area of one conductor 31 is used.

Also in this case, 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. It is preferable to interpose the compound mentioned above between the conductor 33A.

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

The branched cable 100A having the above configuration also has the same technical effects as the branched cable 100 described above.
In the branch cable 100A, the conductor 31 of each branch cable 30 is connected to the branch connector 40 via the second relay conductor 33A. It is possible to suppress the occurrence of gaps in the same manner as 33 or more, and to connect each branch line cable 30 to the trunk cable 20 satisfactorily.
Furthermore, since the conductor 31 of each branch cable 30 can be inserted into the second relay conductor 33A and compression-connected, the connection work can be performed more easily, and the overall installation work efficiency can be improved.

[Third Embodiment]
A branch cable 100B of the third embodiment will be described with reference to the drawings. Regarding this branched cable 100B, the same components as those of the branched cable 100 described above are denoted by the same reference numerals, and overlapping descriptions are omitted, and differences from the branched cable 100 are mainly described.
Unlike the above-described branched cable 100, this branched cable 100B does not use the first relay conductor 33, and the conductors of the plurality of branched cables 30 are inserted into the concave portion 41 of the branch connector 40 from the same direction with respect to the cable axial direction. 31 are arranged and directly connected by compression connection.

FIG. 9 is an explanatory view of the arrangement of the conductors 21 of the trunk cable 20 and the conductors 31 of the two branch cables 30 with respect to the branch connector 40 in a state immediately before compression connection, viewed from the axial direction.
9A shows a state in which two conductors 31 are arranged in the vertical direction (the direction in which the conductors 21 and 31 are arranged), and FIGS. , and are arranged with inclination in each of the left and right directions of the drawing. The two conductors 31 can also be compression-connected in a state of being aligned in the horizontal direction of the drawing, but the illustration is omitted here.

As described above, when the two conductors 31 are connected to the branch connector 40 as they are, the cross-sectional shape of the conductors 31 is a state in which two circles are aligned in point contact, and there is a possibility that a gap or the like may occur between the branch connectors 40. occurs.
For this reason, in the branched cable 100B, the pressure applied during compression connection of the branch connector 40 is adjusted, and the cross-sectional shape of the cross section perpendicular to the axis 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 contacts with

10(A) to 10(C) show cross-sectional shapes of the two conductors 31 and the branch connector 40 after compression connection in each of the arrangements of FIGS. 9(A) to 9(C). . The illustration of the conductor 21 is omitted in FIGS. 10A to 10C. 11 is a cross-sectional view of the two conductors 31 after compression connection in FIG. 10(A).
In the arrangement shown in FIG. 9A, the two conductors 31 are arranged in the same direction as the arrangement of the two recesses 41 and 42 of the branch connector 40 and are compressed.

Between the recess 41 of the branch connector 40 and the two conductors 31, the above-described compound is applied so as to intervene.
10(A) to 10(C), the gap between the two conductors 31 and the branch connector 40 shows a state in which a compound is inserted.

As shown in the figure, the cross section of the conductors 31 of the two branch cables 30 after compression connection shows that the width W of the portion where the adjacent conductors 31 contact each other is the width W of the conductors 31 of the branch cables 30 before connection. It should be at least 10% or more, alternatively 20% or more, preferably 30% or more, more preferably 40% or more, still more preferably 50% or more, or even more preferably 60% or more of the diameter. It is even better if it is 70% or more, 80% or more, or 90% or more.
11 shows only the state after compression connection by the conductor arrangement of FIG. The width W of the portion t is the appropriate width as described above.

Thus, the width W of the contact portion t in the cross-sectional shape of the two conductors 31 has an appropriate width, so that the conductors 31 can be 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 between the branch connector 40 and the width W of the contact portion t between the conductors 31 that is too narrow. Therefore, it is possible to effectively reduce the occurrence of poor connection due to the occurrence of a gap, which is a concern when directly connecting the two conductors 31 to the branch connector 40 .

Moreover, as shown in FIG. 12, the conductors 31 of the two branch cable 30 are bundled with a binding wire 35 as a restraining tool for fastening and restraining the two conductors 31 to the branch connector 40. Compression connections may also be made. In this case, it is preferable that the binding 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 . Also, the binding wire 35 may be removed after compression connection.
In this way, by connecting the conductors 31 to the branch connector 40 in a state where the conductors 31 are bundled by the binding wires 35, the generation of gaps between the conductors 31 can be suppressed and good connection can be achieved.

Further, as shown in FIG. 13, the conductors 31 of the two branch cables 30 are previously fitted into a mold such as a die 36 and pressurized to combine them into one. may be performed. In this case, it is preferable that the die 36 has a shape that solidifies the two conductors 31 into a single columnar shape.
In this way, by connecting the conductors 31 to the branch connector 40 in a state in which the conductors 31 are grouped together by the die 36, it is possible to suppress the occurrence of gaps between the conductors 31 and achieve good connection. Both the binding wire 35 and the die 36 described above may be used together.

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

By pulling out the branch cable 30 from the branch connector 40 in both directions in the axial direction, for example, as shown in FIG. When a plurality of cables 50 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 burdens and costs.

Further, as shown in FIG. 16, the number of branch line cables 30 drawn out on both sides in the axial direction of the branch connector 40 is not limited to one, and a larger number may be drawn out. In this case, it is possible to lay the branch cable 30 toward more power supply destinations (watt-hour meters 50).

It should be noted that drawing out the branch cable 30 to both sides of the branch connector 40 in the axial direction can also be carried out in the same way for the above-described branched cables 100 and 100A.
For example, in the case of the branched cable 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 of the branch connector 40 in the axial direction, and both sides thereof are connected by T-shaped connectors 34, respectively. The conductors 31 of each branch cable 30 may be individually connected. In this case, the cross-sectional area of the first relay conductor 33 should be greater than or equal to the sum of the cross-sectional areas of the conductors 31 of all the branch line cables 30 connected to both sides.
Moreover, in the case of the branched cable 100A, the inserted portions 331A are formed at both ends of the insertion portion 332A so that the conductors 31 of the branch cable 30 can be connected from both sides. In this case also, 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 cable 30 connected to both sides.

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

For example, in each of the above-described embodiments, the conductor 31 of the branch cable 30 is made of copper or a copper alloy, but the branch cable 30 may be made of aluminum or an aluminum alloy.

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 portion 332A insertion portion 34 T-shaped connector (fastener)
35 binding wire (restraint)
36 die 40 branch connector 41, 42 concave portion (connecting portion)
50 Watt-hour meter 60 Resin molding 100, 100A, 100B Cable with branch t Area where conductors are in contact W Width of area where conductors are in contact

Claims (3)

trunk cable and
two branch line cables branching from the trunk cable;
A branched cable comprising a branch connector for connecting the branch line cable to the trunk cable,
The material of the conductor of the trunk cable is aluminum or an aluminum alloy,
Two branch line cables are pulled out from one branch connector,
The branch connector has a connecting portion to which the two branch line cables are connected,
The overall cross -sectional shape of the inner portion of the connecting portion of the conductors of the two branch line cables is a rounded shape without a constriction,
A material of the branch connector is aluminum or an aluminum alloy,
The conductor of the branch line cable is copper or a copper alloy,
The conductors of each of the branch cables are connected to the branch connector in a compressed connection state with no gaps without interposing other parts,
A cable with a branch, wherein a cross section of the conductors of the two branch cables after compression connection has a linear portion where a boundary between the adjacent conductors is in contact with each other. 2. The cable with branches according to claim 1, wherein all of the plurality of branch line cables connected to one branch connector are pulled out in the same direction from the branch connector. 2. The branched cable according to claim 1, wherein a part of the plurality of branch line cables connected to one branch connector and the remaining part are pulled out in both directions from the branch connector. cable.

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