JP2023013081A - Wiring unit, wiring system, and method for checking defective insulation section - Google Patents

Abstract

A switch can be easily provided in the middle of a main cable.
The wiring unit is a wiring unit connected between main cables, and includes a first cable having a conductor line connecting the main cables, and one end branched from the first cable. a second cable having connecting conductor lines extending from the second cable to the other end, connectable at the other end to the switch, and connected at one end to the conductor lines of the first cable; The connection conductor wire of the cable is connected to the conductor wire of the first cable so that the connection state between the main cables can be changed by operating a switch. The wiring system comprises a plurality of main cables, a first wiring unit and a second wiring unit.
[Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a wiring unit, a wiring system, and an insulation failure section checking method.

In facilities such as tunnels and buildings, for example, buildings, a wiring system having a long trunk cable and its branch cables is used (see Patent Documents 1 and 2, for example). For example, in power and communication tunnels, the wiring system described above is used for lighting in the tunnel.

JP-A-52-135081 Japanese Utility Model Laid-Open No. 6-58523

For the above-mentioned wiring system, the length of the trunk cable with branch cables, the interval between the branch cables, etc. are determined by surveying the target facility (for example, tunnels, etc.), and then the circuit diagram of the trunk cable with branch cables is created. and manufactured. In other words, the wiring system was individually manufactured for each target facility.

In the wiring system described above, switching is normally performed on the main power supply side of the wiring system. However, after installation in the target facility, there are cases where it is desired to separately provide a switch in the middle of the trunk cable of the wiring system. In such a case, it is necessary to cut the trunk cable, strip the coating of the trunk cable, and connect the switch cable to the conductor line of the trunk cable at the site of the target facility. Sometimes.

Patent Literatures 1 and 2 disclose that trunk cables with branch cables have appropriate lengths, and by connecting trunk cables with branch cables to form trunk cables, a It is possible to provide branch cables. However, the branch cable of the trunk cable shown in Patent Documents 1 and 2 is a cable that is simply connected to branch from the conductor line of the trunk cable. Therefore, simply connecting a switch to this branch cable cannot switch the trunk cable as the main cable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wiring unit, a wiring system, and a method for checking an insulation failure section that allow a switch to be easily installed in the middle of a main cable.

A wiring unit that connects between main cables,
a first cable having a conductor wire connecting the main cables;
One end branches from the first cable and extends from the one end to the other end, the other end is connectable to a switch, and the one end is connected to the conductor wire of the first cable. a second cable having connecting conductor lines;
with
The connection conductor wire of the second cable is connected to the conductor wire of the first cable so that the connection state between the main cables can be changed by operating the switch.

Further, the wiring system according to the present invention is
a plurality of main cables;
a first wiring unit;
a second wiring unit;
Prepare.

Further, the method for checking an insulation failure section according to the present invention includes:
A method for checking an insulation failure section in the wiring system,
connecting the wiring unit according to claim 6 as an additional wiring unit to a first connection position and a second connection position in which any one of the plurality of main cables is interposed;
At each of the first connection position and the second connection position, in the additional wiring unit, the first end side and the second end side of the conductor wire of the first cable disconnects the
At the first connection position, the first end side is in an insulation state and the second end side is in an insulation failure state, and at the second connection position, the first end side is in an insulation failure state and When the second end side is in an insulated state, it is possible to determine that one of the main cables has insulation failure.

According to the present invention, it is possible to easily provide a switch in the middle of the main cable.

1 is a circuit diagram illustrating a wiring system according to an embodiment of the invention; FIG. 2 is a schematic configuration diagram showing the wiring system shown in FIG. 1; FIG. 2 is a perspective view showing a wiring unit for connecting electrical equipment in the wiring system shown in FIG. 1; FIG. FIG. 2 is a perspective view showing a wiring unit for extension of a main line in the wiring system shown in FIG. 1; 2 is a perspective view showing a wiring unit for a three-way switch in the wiring system shown in FIG. 1; FIG. FIG. 3 is a perspective view showing another wiring unit for a three-way switch in the wiring system shown in FIG. 1; FIG. 2 is a circuit diagram showing a modification of the wiring system shown in FIG. 1; In a circuit diagram showing another modified example of the wiring system shown in FIG. 1, it is a diagram for explaining a method for checking an insulation failure section according to an embodiment of the present invention. and FIG. 11 is a diagram showing a case where a wiring unit for is connected. In the circuit diagram showing another modified example of the wiring system shown in FIG. and FIG. 11 is a diagram showing a case where a wiring unit for is connected. FIG. 2 is a circuit diagram showing another modification of the wiring system shown in FIG. is a diagram showing a case where a wiring unit for a connection/disconnection switch is connected to each of the . FIG. 8B is a perspective view showing an example of a wiring unit for a connection/disconnection switch in the wiring system shown in FIGS. 8A-8C; FIG. 8B is a perspective view showing a modification of the wiring unit for the connection/disconnection switch in the wiring system shown in FIGS. 8A to 8C; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram illustrating a wiring system 100A including wiring units 10A and 10B according to this embodiment. 2 is a schematic configuration diagram showing the wiring system 100A shown in FIG.

1 and 2 show an example in which the wiring system 100A is provided in a tunnel T such as a tunnel for power or communication, but it may be provided in a facility other than the tunnel T (for example, a building). . In addition, in FIGS. 1 and 2, for convenience of explanation, the side where the AC power supply 41 is arranged is defined as the upstream side, and the opposite side is defined as the downstream side.

The wiring system 100A includes wiring units 10A, 10B, 40, 50, 60, and .

[Wiring unit 40]
The wiring unit 40 has a trunk cable (main cable) M1, and as described below, the trunk cable M1 is connected to an AC power supply 41 serving as a main power supply and a ground portion G for grounding. The wiring unit 40 is a wiring unit on the power supply side, and is unitized in advance using a trunk cable M1 having a length that can be carried by the operator.

The trunk cable M1 has five conductor wires W1 to W5. The trunk cable M1 has a connector C2 connected to the upstream ends of the conductor wires W1 to W5, and a connector C1 connected to the downstream ends of the conductor wires W1 to W5. The trunk cable M1 is connected to the AC power source 41 and the ground portion G by connecting the connector C2 on the upstream side to the AC power source 41 and the connector C1 on the ground portion G side. Specifically, in the trunk cable M1, the upstream end of the conductor wire W1 is connected to the ground portion G and grounded, and the upstream ends of the conductor wires W2 and W4 are connected to the AC power supply 41, and the conductor The upstream ends of wires W3 and W5 are each connected to an insulated terminal.

In the present embodiment, as an example applied to three-way switches 30A and 30B and a four-way switch 30C, which will be described later, a trunk cable M1 having five conductor wires is exemplified, but the present invention is not limited to this. The number of conductor lines of the trunk cable M1 is appropriately changed according to the target facilities (for example, tunnels, buildings, etc.) in which it is used. This also applies to trunk cables M1 of wiring units 50, 60, and 70 described below. Also, for convenience of explanation, the reference numerals of the conductor lines in the trunk cable M1 of the wiring units 50, 60, and 70 are the conductor lines W1 to W5, which are the same as those of the trunk cable M1 of the wiring unit.

One of the connectors C1 and C2 is a male connector (for example, a plug) and the other is a female connector (for example, a receptacle), which are fitted to each other so that the conductor wires W1 to W5 can be electrically connected. configuration.

For example, when the connector C1 and the connector C2 are to have a waterproof performance, a connector having a waterproof performance may be used as the connector C1 and the connector C2. It should have waterproof performance.

[Wiring unit 50]
The wiring unit 50 will be described with reference to FIGS. 1 and 2 as well as FIG. FIG. 3 is a perspective view showing a wiring unit 50 for connecting electrical equipment in the wiring system 100A shown in FIG.

The wiring unit 50 has a trunk cable M1 and a branch cable 51, and a lighting fixture 52 is connected to the branch cable 51 as described below. The wiring unit 50 is a wiring unit for connecting electrical equipment such as a lighting fixture 52, and is unitized in advance using a trunk cable M1, a branch cable 51, and a molded portion 51m, which are long enough for a worker to carry.

As with the trunk cable M1 of the wiring unit 40, the trunk cable M1 of the wiring unit 50 has the connector C2 connected to the upstream ends of the conductor wires W1 to W5, and the downstream ends of the conductor wires W1 to W5. A connector C1 is connected.

The branch cable 51 has three conductor wires 511 to 513, one end of the conductor wire 511 is connected to the conductor wire W1, one end of the conductor wire 512 is connected to the conductor wire W3, and one end of the conductor wire 513 is connected to the conductor. It is connected to line W2. The conductor wires 511 to 513 and the conductor wires W1 to W3 may be connected using, for example, connection sleeves 211s to 214s shown in FIG. 5, which will be described later. With such connection, the branch cable 51 is a cable branched from the trunk cable M1. Then, the luminaire 52 is connected to the other ends of the conductor wires 511 to 513 of the branch cable 51 thus branched.

A connection portion between the trunk cable M1 and the branch cable 51 is provided with a molded portion 51m that covers the connection portion in order to provide waterproof performance (see FIGS. 2 and 3). For example, a mold portion 51m is provided around the connecting portion by molding. As a result, the trunk cable M1 and the branch cable 51 can be unitized, and the connection portion can be accommodated inside the mold portion 51m to prevent moisture from entering the connection portion.

The branch cable 51 and the lighting fixture 52 may be connected directly, but for example, connectors C4 and C5 similar to the connectors C1 and C2 described above, such as connectors C4 and C5 having waterproof performance, may be used. (see Figures 2 and 3). For example, the connector C4 is connected to the end of the branch cable 51 on the tip side (lighting fixture 52 side), and the connector C5 is connected to the other end of the cable 53 whose one end is connected to the lighting fixture 52 . The lighting fixture 52 is connected to the branch cable 51 by connecting the connectors C4 and C5 to each other.

Moreover, the lighting fixture 52 has the fixture 52s, as shown in FIG. The lighting equipment 52 is installed in the tunnel T by attaching the fixture 52s to the wall surface of the tunnel T, for example.

In the present embodiment, the branch cable 51 having three conductor wires is exemplified as an example, but the number of conductor wires depends on the number of conductor wires of the main cable M1 and the electrical equipment to be connected. , modified accordingly. In addition, although the lighting equipment 52 is illustrated as an example of the electrical equipment, it can be changed as appropriate according to the target facility in which it is used.

[Wiring unit 60]
The wiring unit 60 will be described with reference to FIGS. 1 and 2 as well as FIG. FIG. 4 is a perspective view showing a wiring unit 60 for trunk line extension in the wiring system 100A shown in FIG.

The wiring unit 60 has a trunk cable M1. The wiring unit 60 is a wiring unit for trunk line extension, and is unitized in advance using a trunk line cable M1 having a length that can be carried by the operator.

As with the trunk cables M1 of the wiring units 40 and 50, the trunk cable M1 of the wiring unit 60 has the connector C2 connected to the upstream ends of the conductor wires W1 to W5, and the downstream ends of the conductor wires W1 to W5. A connector C1 is connected to the portion.

[Wiring unit 70]
The wiring unit 70, like the wiring unit 50, has a trunk cable M1 and a branch cable 51. A lighting fixture 52 is connected to the branch cable 51, and an insulated terminal C3 is connected to the connector C1 at the downstream end of the trunk cable M1. is connected. The wiring unit 70 is a wiring unit for connecting electrical equipment such as the lighting equipment 52, and has an insulated terminal C3. Unitized in advance.

As with the trunk cables M1 of the wiring units 40, 50, and 60, the trunk cable M1 of the wiring unit 70 has the connector C2 connected to the ends of the conductor wires W1 to W5 on the upstream side, and the conductor wires W1 to W5 are connected to the downstream side of the conductor wires W1 to W5. A connector C1 is connected to the end of . The downstream ends of the conductor wires W1 to W5 are each insulated by an insulated terminal C3 connected to the connector C1. Since the branch cable 51 of the wiring unit 70 has the same configuration as the branch cable 51 of the wiring unit 50, redundant description will be omitted here.

The wiring units 40, 50, 60, and 70 described above are each unitized, but the trunk cable M1 and the branch cable 51 may be standardized as one unit having an appropriate length that can be carried by the operator. . For example, the length of the trunk cable M1 may be adjusted to a unit length of about several tens of meters that can be grasped.

[Wiring unit 10A]
The wiring unit 10A will be described with reference to FIGS. 1 and 2 as well as FIG. FIG. 5 is a perspective view showing wiring unit 10A for three-way switch 30A in wiring system 100A shown in FIG. In FIG. 5, in order to show the inside of the molded portion 21m and the three-way switch 30A, the external appearance of the molded portion 21m and the three-way switch 30A is shown by phantom lines.

The wiring unit 10A connects between the trunk cables M1. The wiring unit 10A has a trunk cable M2 (first cable) having conductor lines W1 to W5 connecting the trunk cables M1, and conductor lines 211 to 214 (connection conductor lines) capable of connecting the three-way switch 30A. and a switch cable 21 (second cable). One end of the switch cable 21 is connected to the conductor lines W1 to W5 of the trunk cable M2, and branches from the trunk cable M2 to extend from the one end to the other end. Connectable. The wiring unit 10A is a wiring unit for switches such as the three-way switch 30A, and is unitized in advance using a trunk cable M2, a switch cable 21, and a molded portion 21m, which are long enough to be carried by a worker.

The trunk cable M2 has a configuration similar to that of the trunk cable M1. The connector C2 is connected to the upstream ends of the conductor wires W1 to W5, and the connector C1 is connected to the downstream ends of the conductor wires W1 to W5. It is connected. Also, the conductor wire W4 is separated into an upstream side and a downstream side.

The switch cable 21 has four conductor wires 211-214. The conductor lines 211 to 214 are connected to the conductor lines W1 to W5 of the trunk cable M2 so that the connection state between the trunk cables M1 can be changed by operating the three-way switch 30A. Specifically, in the switch cable 21, one end of the conductor wire 211 is connected to the conductor wire W1 by the connection sleeve 211s. Also, one end of the conductor wire 212 is connected to the conductor wire W5 by a connection sleeve 212s. One end of the conductor wire 213 is connected to the upstream side (first end portion side) of the conductor wire W4 by a connection sleeve 213s, and one end of the conductor wire 214 is connected to the downstream side (second end portion side) of the conductor wire W4 by a connection sleeve 214s. end side). With such a connection, the switch cable 21 connects the upstream side of the conductor wire W4 (the first conductor wire in the present invention) with the downstream side of the conductor wire W4 or the conductor wire W5 (the second conductor wire in the present invention). can be changed to connect with

As the connection sleeves 211s to 214s, those whose outer peripheral portions are insulated, those having an insulating sleeve on their outer periphery, or the like are used.

A three-way switch 30A is connected to the other ends of the conductor wires 211 to 214 of the switch cable 21 connected in this manner. As shown in FIG. 5, the three-way switch 30A has a ground terminal 311g, a switch body 31s, a terminal block 31t, etc. inside a metal housing 311, and is connected to the switch cable 21 as follows. .

Specifically, the other end of the conductor wire 211 is connected to the ground terminal 311g. The other end of the conductor wire 212 is connected to the fixed contact 312 of the switch body 31s through the terminal block 31t, the other end of the conductor wire 213 is connected to the movable contact 313 of the switch body 31s, and the conductor wire 214 The end is connected to the fixed contact 314 of the switch body 31s. Then, by operating the three-way switch 30A connected to the switch cable 21 and bringing the movable contact 313 into contact with the fixed contact 312 or the fixed contact 314, the upstream side of the conductor wire W4 is changed to the downstream side or the downstream side of the conductor wire W4. Connect to the conductor wire W5.

A molded portion 21m that covers the connecting portion between the trunk cable M2 and the switch cable 21 is provided to provide waterproof performance (see FIGS. 2 and 5). For example, a mold portion 21m is provided around the connecting portion by molding. As a result, the trunk cable M2 and the switch cable 21 can be unitized, and the connection portion can be accommodated inside the mold portion 21m to prevent moisture from entering the connection portion. Further, the insertion port for inserting the switch cable 21 into the metal housing 311 is protected from water intrusion by a waterproof gland 21g provided in the insertion port.

The three-way switch 30A is desirably arranged at a position near the vertical shaft S1 of the tunnel T, so the wiring unit 10A is also connected to the other wiring units 40, 50, 60, 70 at a position near the vertical shaft S1. It is desirable to

[Wiring unit 10B]
The wiring unit 10B will be described with reference to FIGS. 1 and 2 as well as FIG. FIG. 6 is a perspective view showing the wiring unit 10B for the three-way switch 30B in the wiring system 100A shown in FIG. In addition, in FIG. 6, in order to show the inside of the mold part 22m, the external appearance of the mold part 22m is indicated by a phantom line. Also, since the three-way switch 30B has the same configuration as the three-way switch 30A shown in FIG. 5, illustration of the three-way switch 30B is omitted in FIG.

The wiring unit 10B connects between the trunk cables M1. The wiring unit 10B has a trunk cable M3 (first cable) having conductor lines W1 to W5 connecting the trunk cables M1, and conductor lines 221 to 224 (connection conductor lines) capable of connecting the three-way switch 30B. and a switch cable 22 (second cable). One end of the switch cable 22 is connected to the conductor lines W1 to W5 of the trunk cable M3, and branches from the trunk cable M3 to extend from the one end to the other end. Connectable. The wiring unit 10B is a wiring unit for switches such as the three-way switch 30B, and is unitized in advance using a trunk cable M3, a switch cable 22, and a molded portion 22m, which are long enough for a worker to carry.

The trunk cable M3 has a configuration similar to that of the trunk cable M1. The connector C2 is connected to the upstream ends of the conductor wires W1 to W5, and the connector C1 is connected to the downstream ends of the conductor wires W1 to W5. It is connected.

The switch cable 22 has four conductor wires 221-224. The conductor lines 221 to 224 are connected to the conductor lines W1 to W5 of the trunk cable M3 so that the state of connection between the trunk cables M1 can be changed by operating the three-way switch 30B. Specifically, in the switch cable 22, one end of the conductor wire 221 is connected to the conductor wire W1 by a connection sleeve 221s. Also, one end of the conductor wire 222 is connected to the conductor wire W3 by a connection sleeve 222s. One end of the conductor wire 223 is connected to the conductor wire W4 by a connection sleeve 223s. Also, one end of the conductor wire 224 is connected to the conductor wire W5 by a connection sleeve 224s. With such a connection, the switch cable 22 connects either the conductor wire W4 (the first conductor wire in the present invention) or the conductor wire W5 (the second conductor wire in the present invention) to the conductor wire W3 (the present invention). It can be changed to connection with the third conductor line in the invention).

As the connection sleeves 221s to 224s, those whose outer peripheral portions are insulated, those having an insulating sleeve on their outer periphery, or the like are used.

The three-way switch 30B is connected to the other ends of the conductor wires 221 to 224 of the switch cable 22 connected in this manner. Although not shown, the three-way switch 30B has a ground terminal, a switch body, a terminal block, etc. inside the metal housing 321, and is connected to the switch cable 22 as follows.

Specifically, the other end of the conductor wire 221 is connected to the ground terminal of the metal housing 321 of the three-way switch 30B. The other end of the conductor wire 222 is connected to the movable contact 322 of the switch body through the terminal block, the other end of the conductor wire 223 is connected to the fixed contact 323 of the switch body, and the other end of the conductor wire 224 is connected to the switch body. It is connected to the fixed contact 324 of the main body. Then, by operating the three-way switch 30B connected to the switch cable 22 and bringing the movable contact 322 into contact with the fixed contact 323 or the fixed contact 324, either the conductor wire W4 or the conductor wire W5 is switched to the conductor wire W3. connect to.

A molded portion 22m that covers the connecting portion between the trunk cable M3 and the switch cable 22 is provided in order to provide waterproof performance (see FIGS. 2 and 6). For example, a mold portion 22m is provided around the connecting portion by molding. As a result, the trunk cable M3 and the switch cable 22 can be unitized, and the connecting portion can be accommodated inside the molded portion 22m to prevent moisture from entering the connecting portion. Further, the insertion opening for inserting the switch cable 22 into the metal casing 321 is protected from water intrusion by a waterproof gland (not shown) provided in the insertion opening.

The three-way switch 30B is desirably arranged at a position close to the vertical shaft S2 of the tunnel T, so the wiring unit 10B is also connected to the other wiring units 40, 50, 60, 70 at a position close to the vertical shaft S2. It is desirable to

The wiring units 10A and 10B described above are also unitized. good. For example, the lengths of the trunk cables M2 and M3 may be shorter than the length of the trunk cable M1, and may be standardized with about 1 m as one unit.

Making the lengths of the trunk cables M2 and M3 shorter than the length of the trunk cable M1 makes it easier to carry the wiring units 10A and 10B. Moreover, even after the wiring units 40, 50, 60, and 70 are installed, the wiring units 10A and 10B can be easily connected to arbitrary positions therebetween.

Thus, the wiring system 100A includes the wiring units 10A, 10B, 40, 50, 60, 70 having the above-described configuration. The wiring units 10A, 10B, 40, 50, 60, and 70 are connected in series with each other by connectors C1 and C2 to form a single wiring system 100A. Also, in the wiring system 100A, the wiring units 10A and 10B are connected between a plurality of trunk cables M1 of the wiring units 40, 50, 60 and 70. As shown in FIG.

[effect]
In the wiring system 100A, each of the wiring units 10A, 10B, 40, 50, 60, 70 is standardized and unitized. As such, these inventory spaces can be tailored to a standardized length and can be small compared to the inventory space for the entire wiring system.

Also, the wiring units 10A, 10B, 40, 50, 60, and 70 are unitized for each function of the wiring system. Therefore, if an appropriate amount of wiring units 10A, 10B, 40, 50, 60, and 70, which are unitized for each function, are stocked in the inventory space, it is possible to supply the necessary wiring units when necessary. Any request can be delivered immediately.

The wiring system 100A also includes wiring units 10A and 10B for switching the trunk cables. The wiring system 100A is configured as a single wiring system 100A by appropriately combining the wiring units 10A, 10B and the wiring units 40, 50, 60, 70, thereby facilitating the wiring system 100A with a switch function. can be built.

In this case, the order of the wiring units 10A, 10B, 50, and 60 other than the wiring units 40 and 70 can be appropriately changed according to the target facility used. Also, the number of wiring units 50 and 60 can be appropriately changed according to the target facility used. That is, the combination of wiring units 10A, 10B, 40, 50, 60, 70 has a wide application range, and the wiring system 100A with a switch function can be adapted to any target facility. For example, for tunnel illumination, the wiring system 100A with a switch function can be easily constructed according to the structure of the tunnel.

In particular, the wiring units 10A, 10B can be easily connected to any position between the wiring units 40, 50, 60, 70 even after the wiring units 40, 50, 60, 70 are installed, as described above. Therefore, in the wiring system 100A, the three-way switches 30A and 30B can be provided at desired positions or their positions can be changed, thereby increasing the degree of freedom in their installation. Therefore, in the wiring system 100A, even if the wiring system is expanded or modified, it can be easily dealt with.

In FIG. 1, the trunk cables M1, M2 and M3 have the conductor wire W1 connected to the ground portion G, but the conductor wire W1 may be omitted. In that case, the conductor wire 511 of the branch cable 51, the conductor wire 211 of the switch cable 21, and the conductor wire 221 of the switch cable 22 may be omitted.

<Modification 1>
FIG. 7 is a circuit diagram showing a modification (wiring system 100B) of the wiring system 100A shown in FIG.

Although FIG. 7 also shows an example in which the wiring system 100B is provided in the tunnel T, it may be provided in a facility other than the tunnel T (for example, a building). Also in FIG. 7, for convenience of explanation, the side where the AC power supply 41 is arranged is defined as the upstream side, and the opposite side is defined as the downstream side.

The wiring system 100B includes wiring units 10A, 10B, 10C, 40, 50, and 70. FIG. In other words, the wiring unit 10C is provided in place of the wiring unit 60 in the wiring system 100A.

In the wiring system 100B, the wiring units 10A, 10B, 40, 50, 70 have the same configuration as the wiring units 10A, 10B, 40, 50, 70 in the wiring system 100A. Therefore, redundant descriptions thereof will be omitted here.

[Wiring unit 10C]
In this modified example, the wiring system 100B includes the wiring unit 10C as described above.

The wiring unit 10C connects between the trunk cables M1. The wiring unit 10C has a trunk cable M4 (first cable) having conductor lines W1 to W5 connecting the trunk cables M1, and conductor lines 231 to 235 (connection conductor lines) capable of connecting the four-way switch 30C. and a switch cable 23 (second cable). One end of the switch cable 23 is connected to the conductor wires W1 to W5 of the trunk cable M4, and the switch cable 23 branches from the trunk cable M4 and extends from the one end to the other end. Connectable. The wiring unit 10C is a wiring unit for switches such as the four-way switch 30C, and is unitized in advance using a trunk cable M4, a switch cable 23, and a molded part (not shown) that are long enough for a worker to carry. ing.

The trunk cable M4 has a configuration similar to that of the trunk cable M1 described above. The connector C2 is connected to the upstream ends of the conductor wires W1 to W5, and the connector C1 is connected to the downstream ends of the conductor wires W1 to W5. It is connected. Also, the conductor wires W4 and W5 are separated into an upstream side and a downstream side.

The switch cable 23 has five conductor wires 231-235. The conductor lines 231 to 235 are connected to the conductor lines W1 to W5 of the trunk cable M4 so that the state of connection between the trunk cables M1 can be changed by operating the four-way switch 30C. Specifically, in the switch cable 23, one end of the conductor wire 231 is connected to the conductor wire W1 by a connection sleeve (not shown). One end of the conductor wire 232 is connected to the upstream side (first end side) of the conductor wire W5 by another connection sleeve (not shown), and one end of the conductor wire 233 is connected by another connection sleeve (not shown). It is connected to the downstream side (second end side) of the conductor wire W5. One end of the conductor wire 234 is connected to the upstream side (first end side) of the conductor wire W4 by another connection sleeve (not shown), and one end of the conductor wire 235 is connected by another connection sleeve (not shown). It is connected to the downstream side (second end side) of the conductor wire W4.

As the plurality of connection sleeves, those whose outer peripheral portions are insulated, those having an insulating sleeve on their outer periphery, or the like are used.

With such connection, the switch cable 23 is connected upstream and downstream of the conductor wire W4 (the first conductor wire in the present invention) and upstream and downstream of the conductor wire W5 (the second conductor wire in the present invention). side can be changed to straight connection or cross connection.

The four-way switch 30C is connected to the other ends of the conductor wires 231 to 235 of the switch cable 23 connected in this manner. Although not shown, the four-way switch 30C has a ground terminal, a switch body, a terminal block, etc. inside the metal housing 331, and is connected to the switch cable 23 as follows.

Specifically, the other end of the conductor wire 231 is connected to the ground terminal of the metal housing 331 of the four-way switch 30C. The other end of the conductor wire 232 is connected to the movable contact 332 of the switch body through the terminal block, and the other end of the conductor wire 233 is connected to the fixed contacts 333a and 333b of the switch body. Also, the other end of the conductor wire 234 is connected to the movable contact 334 of the switch via the terminal block, and the other end of the conductor wire 235 is connected to the fixed contacts 335a and 335b of the switch body.

When the four-way switch 30C connected to the switch cable 23 is operated, the movable contacts 332 and 334 interlock and move between the contacts. At this time, the movable contact 332 comes into contact with the fixed contact 333a or the fixed contact 335a, and the movable contact 334 comes into contact with the fixed contact 333b or the fixed contact 335b. As a result, the upstream and downstream sides of the conductor wire W4 and the upstream and downstream sides of the conductor wire W5 are changed to straight connection or cross connection.

A molded portion (not shown) is provided to cover the connecting portion between the trunk cable M4 and the switch cable 23 in order to provide waterproof performance. For example, a molded portion is provided around the connecting portion by molding. As a result, the trunk cable M4 and the switch cable 23 can be unitized, and the connection portion can be accommodated inside the molded portion to prevent moisture from entering the connection portion. Further, the insertion port through which the switch cable 23 is inserted into the interior of the metal casing 331 is protected from water intrusion by a waterproof gland (not shown) provided in the insertion port.

The four-way switch 30C is desirably arranged at a position close to the vertical shaft S3 of the tunnel T, so the wiring unit 10C is also connected to the other wiring units 40, 50, 70 at a position close to the vertical shaft S3. is desirable.

Although the wiring unit 10C described above is also unitized, the main cable M4 and the switch cable 23 may be standardized as one unit having an appropriate length that can be carried by the operator. For example, the length of the trunk cable M4 may be shorter than the length of the trunk cable M1 described above, and the length may be standardized with about 1 m as one unit.

Making the length of the trunk cable M4 shorter than the length of the trunk cable M1 makes it easier to carry the wiring unit 10C. Moreover, even after the wiring units 10A, 10B, 40, 50, and 70 are installed, the wiring unit 10C can be easily connected to an arbitrary position between them.

In this manner, the wiring system 100B includes the wiring units 10A, 10B, 10C, 40, 50, and 70 configured as described above. The wiring units 10A, 10B, 10C, 40, 50, and 70 are connected in series by connectors C1 and C2 to form a single wiring system 100B. In addition, in the wiring system 100B, the wiring units 10A, 10B, and 10C are connected between a plurality of trunk cables M1 of the wiring units 40, 50, and 70, and the wiring unit 10C is connected between the wiring units 10A and 10B. are placed in

[effect]
The wiring system 100B includes a wiring unit 10C for switching its trunk cable. The wiring system 100A is configured as a single wiring system 100B by appropriately combining the wiring units 10A, 10B, 10C and the wiring units 40, 50, 70, thereby facilitating the wiring system 100B with a switch function. can be built.

In this case, the order of the wiring units 10A, 10B, 10C, and 50 other than the wiring units 40 and 70 can be appropriately changed according to the target facility used. In addition, the number of wiring units 10C and 50 can also be appropriately changed according to the target facility used. In other words, the combination of wiring units 10A, 10B, 10C, 40, 50 and 70 has a wide application range, and the wiring system 100B with a switch function can be adapted to all target facilities.

In particular, like the wiring units 10A and 10B, the wiring unit 10C can be easily connected to any position between the wiring units 40, 50 and 70 even after the wiring units 40, 50 and 70 are installed. Also, unlike the wiring units 10A and 10B, any number of the wiring units 10C may be installed. Therefore, in the wiring system 100B, the three-way switches 30A, 30B and the four-way switch 30C can be provided at desired positions, their positions can be changed, and the number of the four-way switches 30C can be increased. The degree of freedom of installation can be increased. Therefore, in the wiring system 100B, even if the wiring system is expanded or modified, it can be easily dealt with.

In FIG. 7, the trunk cable M4 has a conductor wire W1 connected to the ground portion G, but the conductor wire W1 may be omitted. In that case, the conductor wire 231 of the switch cable 23 may be omitted.

<Modification 2>
8A to 8C are circuit diagrams showing another modification (wiring system 100C) of the wiring system 100A shown in FIG. 1, and are diagrams for explaining the method for checking an insulation failure section according to the present embodiment. FIG. 8A is a diagram showing a case where a wiring unit 10D for a connection/disconnection switch is connected to the first connection position in the wiring system 100C. FIG. 8B is a diagram showing a case where a wiring unit 10D for a connection/disconnection switch is connected to the second connection position in the wiring system 100C. FIG. 8C is a diagram showing a case where the wiring unit 10D for the connection/disconnection switch is connected to each of the first connection position and the second connection position in the wiring system 100C. In addition, in FIG. 8C, illustration of a part of the configuration on the upstream side and the downstream side shown in FIGS. 8A and 8B is omitted.

8A to 8C, the wiring system 100C is provided in the tunnel T (see FIGS. 1 and 7), but the illustration of the tunnel T is omitted in FIGS. 8A to 8C. Also, in FIGS. 8A to 8C, for convenience of explanation, the side where the AC power supply 41 is arranged is referred to as the upstream side, and the opposite side is referred to as the downstream side.

The wiring system 100C includes wiring units 10A, 10B, 10D, 40, 50, and . In other words, a wiring unit 10D is provided in place of the wiring unit 60 in the wiring system 100A.

In the wiring system 100C, the wiring units 10A, 10B, 40, 50, 70 have the same configuration as the wiring units 10A, 10B, 40, 50, 70 in the wiring system 100A. Therefore, redundant descriptions thereof will be omitted here.

[Wiring unit 10D]
In this modified example, the wiring system 100C includes the wiring unit 10D as described above. The wiring unit 10D will be described with reference to FIGS. 9 and 10 as well as FIGS. 8A to 8C. FIG. 9 is a perspective view showing an example of the wiring unit 10D (wiring unit 10D-1) for the connection/disconnection switch 30D in the wiring system 100C shown in FIGS. 8A to 8C. FIG. 10 is a perspective view showing a modification (wiring unit 10D-2) of the wiring unit 10D for the connection/disconnection switch 30D in the wiring system 100C shown in FIGS. 8A to 8C. 9 and 10, in order to show the inside of the switch 30D, the external appearance of the switch 30D is shown by imaginary lines. Also, the reference numerals of the conductor lines in the switch 30D are omitted for convenience of description.

The wiring unit 10D connects between the trunk cables M1. The wiring unit 10D is for a switch having a trunk cable M5 (first cable) having conductor lines W1 to W5 connecting the trunk cables M1 and conductor lines 241 to 249 (connecting conductor lines) capable of connecting the switch 30D. and a cable 24 (second cable). One end of the switch cable 24 is connected to the conductor lines W1 to W5 of the trunk cable M5, branches from the trunk cable M5 and extends from the one end to the other end, and the other end is connectable to the switch 30D. is. The wiring unit 10D is a wiring unit for switches such as the switch 30D. Unitized in advance.

The trunk cable M5 has a configuration similar to that of the trunk cable M1. The connector C2 is connected to the upstream ends of the conductor wires W1 to W5, and the connector C1 is connected to the downstream ends of the conductor wires W1 to W5. It is connected. Also, the conductor wires W2 to W5 are separated into an upstream side and a downstream side.

The switch cable 24 has nine conductor wires 241-249. The conductor lines 241 to 249 are connected to the conductor lines W1 to W5 of the trunk cable M5 so that the state of connection between the trunk cables M1 can be changed by operating the switch 30D. Specifically, in the switch cable 24, one end of the conductor wire 241 is connected to the conductor wire W1 by a connection sleeve (not shown). One end of the conductor wire 242 is connected to the upstream side (first end side) of the conductor wire W5 by another connection sleeve (not shown), and one end of the conductor wire 243 is connected by another connection sleeve (not shown). It is connected to the downstream side (second end side) of the conductor wire W5. One end of the conductor wire 244 is connected to the upstream side (first end side) of the conductor wire W4 by another connection sleeve (not shown), and one end of the conductor wire 245 is connected by another connection sleeve (not shown). It is connected to the downstream side (second end side) of the conductor wire W4. One end of the conductor wire 246 is connected to the upstream side (first end side) of the conductor wire W3 by another connection sleeve (not shown), and one end of the conductor wire 247 is connected by another connection sleeve (not shown). It is connected to the downstream side (second end side) of the conductor wire W3. One end of the conductor wire 248 is connected to the upstream side (first end side) of the conductor wire W2 by another connection sleeve (not shown), and one end of the conductor wire 249 is connected by another connection sleeve (not shown). It is connected to the downstream side (second end side) of the conductor wire W2.

As the plurality of connection sleeves, those whose outer peripheral portions are insulated, those having an insulating sleeve on their outer periphery, or the like are used.

With such connection, the switch cable 24 can connect or disconnect between the upstream side and the downstream side of the conductor wires W2 to W5.

The switch 30D is connected to the other ends of the conductor wires 241 to 249 of the switch cable 24 connected in this way. As shown in FIGS. 9 and 10, the switch 30D has a ground terminal 341g, a cam switch 34s, terminal blocks 34tu and 34td inside a metal housing 341, and the like.

The cam switch 34s has movable contacts 342, 344, 346 and 348, fixed contacts 343a, 345a, 347a and 349a, and contacts 343b, 345b, 347b and 349b. The cam switch 34s has a terminal portion 34s2, and each terminal of the terminal portion 34s2 is connected to movable contacts 342, 344, 346, 348 and fixed contacts 343a, 345a, 347a, 349a. By rotating the handle 34s1 of the cam switch 34s, the movable contacts 342, 344, 346 and 348 and the fixed contacts 343a, 345a, 347a and 349a can be connected and disconnected. The contacts 343b, 345b, 347b and 349b are the contacts with which the movable contacts 342, 344, 346 and 348 contact when breaking the connection.

The switch 30D having such a configuration is connected to the switch cable 24 as follows. Specifically, the other end of the conductor wire 241 is connected to the ground terminal 341g. The other end of the conductor wire 242 is connected to the movable contact 342 via the terminal block 34tu and the terminal portion 34s2 of the cam switch 34s. Also, the other end of the conductor wire 243 is connected to the fixed contact 343a via the terminal block 34td and the terminal portion 34s2. Also, the other end of the conductor wire 244 is connected to the movable contact 344 via the terminal block 34tu and the terminal portion 34s2. Also, the other end of the conductor wire 245 is connected to the fixed contact 345a via the terminal block 34td and the terminal portion 34s2. Also, the other end of the conductor wire 246 is connected to the movable contact 346 via the terminal block 34tu and the terminal portion 34s2. Also, the other end of the conductor wire 247 is connected to the fixed contact 347a via the terminal block 34td and the terminal portion 34s2. Also, the other end of the conductor wire 248 is connected to the movable contact 348 via the terminal block 34tu and the terminal portion 34s2. Also, the other end of the conductor wire 249 is connected to the fixed contact 349a via the terminal block 34td and the terminal portion 34s2. Thus, the conductor wires 242, 244, 246, 248 connected upstream of the conductor wires W1 to W5 are connected to the terminal portion 34s2 of the cam switch 34s via the terminal block 34tu. Conductor wires 243, 245, 247, and 249 connected downstream of conductor wires W1 to W5 are connected to terminal portion 34s2 of cam switch 34s via terminal block 34td.

Further, the metal housing 341 has a housing main body 341a, a lid 341b, a seal member 341c, and the like. The lid 341b is attached to the opening of the housing body 341a via a sealing member 341c so that the metal housing 341 can be waterproofed. As the sealing member 341c, known materials such as O-rings and packing materials can be used. The terminal portion 34s2 of the cam switch 34s and the terminal blocks 34tu and 34td can be easily accessed from the opening of the housing body 341a by removing the lid 341b.

When the connection between the movable contacts 342, 344, 346 and 348 and the fixed contacts 343a, 345a, 347a and 349a is interrupted, the terminal portion 34s2 and the terminal blocks 34tu and 34td are separated upstream terminals and downstream terminals. function as side terminals. In other words, the conductor wires 242 to 249 have the terminal portion 34s2 and the terminal block 34tu that function as an upstream terminal (first terminal) and a downstream terminal (second terminal) when disconnecting the contacts. , 34td. When the cover 341b is removed from the housing main body 341a, the terminal portion 34s2 and the terminal blocks 34tu and 34td are exposed to the outside and can be easily accessed from the opening of the housing main body 341a, which will be described later. It is possible to check the insulation failure section.

Here, the metal housing 341 is used as the housing of the switch 30D, but a housing other than metal, for example, an insulating housing made of resin or the like may be used. For example, a resin box in which the terminal blocks 34tu and 34td and the cam switch 34s are provided can be used. If an insulating housing made of resin or the like is used as the housing of the switch 30D, grounding is unnecessary. Also, instead of the terminal blocks 34tu and 34td and the cam switch 34s, it is possible to use a disconnecting terminal block that serves as both a switch and a terminal block.

When the switch 30D connected to the switch cable 24 is operated, the movable contacts 342, 344, 346 and 348 interlock and move between the contacts. At this time, the movable contact 342 contacts the fixed contact 343a or the contact 343b. Also, the movable contact 344 contacts the fixed contact 345a or the contact 345b. Also, the movable contact 346 contacts the fixed contact 347a or the contact 347b. Also, the movable contact 348 contacts the fixed contact 349a or the contact 349b. This connects or disconnects the upstream and downstream sides of the conductor wires W2 to W5.

When the wiring unit 10D cuts off the upstream side and the downstream side of the conductor wires W2 to W5, the wiring unit 10D can confirm the insulation state of the upstream side or the downstream side of the conductor wires W2 to W5. Then, for example, by changing the connection position of the wiring unit 10D, it is possible to check an insulation failure section of the main cable of the wiring system 100C, as will be described later.

A connection portion between the trunk cable M5 and the switch cable 24 is provided with a molded portion 24m covering the connection portion, as shown in FIG. For example, a mold portion 24m is provided around the connecting portion by molding. As a result, the trunk cable M5 and the switch cable 24 can be unitized, and the connection portion can be accommodated inside the molded portion 24m to prevent moisture from entering the connection portion. Also, the insertion port for inserting the switch cable 24 into the metal casing 341 is protected from water intrusion by a waterproof gland 24g provided in the insertion port.

Further, when connecting between the trunk cable M5 and the switch 30D using a plurality of switch cables, the molded portions are provided according to the number of connection portions.

For example, as shown in FIG. 10, when two switch cables 24a and 24b are used to connect between the trunk cable M5 and the switch 30D, two connecting portions are covered. Mold portions 24ma and 24mb are provided. For example, molding is performed to provide mold portions 24ma and 24mb around the two connecting portions. As a result, the trunk cable M5 and the switch cables 24a and 24b can be unitized, and the connecting portions can be accommodated inside the molded portions 24ma and 24mb to prevent moisture from entering the connecting portions. The two insertion openings for inserting the switch cables 24a and 24b into the interior of the metal housing 341 are protected from water intrusion by waterproof glands 24ga and 24gb provided in the two insertion openings. .

Although the wiring unit 10D described above is also unitized, the trunk cable M5 and the switch cable 24 may be standardized as one unit having an appropriate length that can be carried by the operator. For example, the length of the trunk cable M5 may be shorter than the length of the trunk cable M1, and the length may be standardized with about 1 m as one unit.

Making the length of the trunk cable M5 shorter than the length of the trunk cable M1 makes it easier to carry the wiring unit 10D. Moreover, even after the wiring units 10A, 10B, 40, 50, and 70 are installed, the wiring unit 10D can be easily connected to an arbitrary position between them. Thereby, an insulation failure section can be confirmed.

[Method for checking defective insulation section]
A method for checking an insulation failure section according to the present embodiment will be described with reference to FIGS. 8A to 8C. 8A to 8C show a configuration in which a wiring unit 10D is connected in place of the wiring unit 60 in FIG. 1. However, in the wiring system 100A shown in FIG. A wiring unit 10D may be connected between the units.

When checking an insulation failure section in the wiring system 100C, first, the AC power supply 41, which is the main power supply, is turned off in order to ensure the safety of the operator. In addition, the electrical equipment on the load side such as the lighting equipment 52 connected to the trunk cable M1 is removed.

Next, in the wiring system 100C, the wiring unit 10D is connected in series to the connection position between the trunk cables M1, M2 and M3 of the wiring units 10A, 10B, 40, 50 and 70. FIG.

For example, as shown in FIG. 8A, the wiring unit 10D is connected in series at the first connection position, and then, as shown in FIG. 8B, the wiring unit 10D is connected in series at the second connection position. In this manner, one wiring unit 10D may be used to connect to different connection positions. Further, for example, as shown in FIG. 8C, a wiring unit 10D is connected in series to the first connection position, and another wiring unit 10D is connected in series to the second connection position. In this manner, a plurality of wiring units 10D may be used and connected to different connection positions.

In FIGS. 8A and 8C, the upstream first connection position is between the trunk cable M2 of the wiring unit 10A and the trunk cable M1 of the wiring unit 50, as an example. In FIGS. 8B and 8C, the downstream second connection position is, for example, between the trunk cable M1 of the wiring unit 50 on the upstream side and the trunk cable M1 of the wiring unit 50 on the downstream side. To simplify the explanation, an example in which the wiring unit 10D is connected to two connection positions as shown in FIGS. 8A to 8C will be described below. may be connected to the wiring unit 10D.

In the wiring unit 10D connected to the first and second connection positions, the movable contacts 342, 344, 346 and 348 of the cam switch 34s of the switch 30D are connected to the contacts 343b, 345b, 347b and 349b (hereinafter referred to as contacts b). side). As a result, the connection between the upstream side and the downstream side of the conductor wires W2 to W5 in the trunk cable M5 is cut off. The state of insulation on the upstream side and the state of insulation on the downstream side of the conductor wires W2 to W5 whose connection has been interrupted in this manner are checked.

At this time, when all the contacts 343b, 345b, 347b and 349b of the cam switch 34s are short-circuited to each other, if the insulation resistance between any of these contacts and the grounded conductor wire W1 is measured, the upstream It is possible to collectively judge the insulation state of the conductor wires W2 to W5 on the side. For example, the movable contacts 342, 344, 346 and 348 switched to the contact b side are connected to the terminal block 34tu as described above. Therefore, if the terminals of the terminal block 34tu are short-circuited to each other, the contacts 343b, 345b, 347b and 349b are short-circuited to each other. By measuring the insulation resistance between the terminals of the terminal block 34tu and the conductor wire W1, the insulation state of the conductor wires W2 to W5 on the upstream side can be collectively determined more easily.

Similarly, when all of the fixed contacts 343a, 345a, 347a and 349a are short-circuited to each other, if the insulation resistance between any of these fixed contacts and the grounded conductor wire W1 is measured, the downstream side The insulation state of the conductor wires W2 to W5 can be collectively judged. For example, fixed contacts 343a, 345a, 347a and 349a are connected to terminal block 34td as described above. Therefore, if the terminals of the terminal block 34td are short-circuited to each other, the fixed contacts 343a, 345a, 347a and 349a are short-circuited to each other. By measuring the insulation resistance between the terminal of the terminal block 34td and the conductor wire W1, the insulation state of the conductor wires W2 to W5 on the downstream side can be more easily collectively determined. In this way, by collectively measuring the insulation resistance of the conductor wires W2 to W5 of all phases, the insulation state can be determined efficiently and safely.

On the other hand, after switching the cam switch 34s to the contact b side to cut off the connection between the upstream side and the downstream side of the trunk cable M5, if the contacts 343b, 345b, 347b and 349b are not short-circuited, the following procedure is performed. to measure the insulation resistance and judge the state of insulation. For example, by measuring the insulation resistance between the grounded conductor wire W1 and the conductor wires W2 to W5 on the upstream side, the insulation state of each of the conductor wires W2 to W5 on the upstream side is determined. Similarly, when the fixed contacts 343a, 345a, 347a and 349a are not short-circuited to each other, the insulation resistance between the grounded conductor wire W1 and the conductor wires W2 to W5 is measured on the downstream side. , the insulation state of each of the conductor wires W2 to W5 is determined.

Thus, in each of the different connection positions (first and second connection positions), the cam switch 34s is switched to the contact b side to cut off the connection between the upstream side and the downstream side of the trunk cable M5. After the disconnection, the state of insulation on the upstream side and the state of insulation on the downstream side of the conductor wires W2 to W5 in the trunk cable M5 are checked. As a result of checking the insulation state, if the following conditions are satisfied, the trunk cable of the corresponding wiring unit is determined to have poor insulation.

Specifically, at the first connection position, the upstream side is in an insulated state and the downstream side is in an insulation failure state, and at the second connection position, when the upstream side is in an insulation failure state and the downstream side is in an insulated state, the first connection It is determined that there is an insulation failure in the trunk cable in the section sandwiched between the position and the second connection position.

For example, in FIGS. 8A to 8C, assume that there is an insulation failure in the conductor wire W5 (indicated by an asterisk) in the wiring unit 50 on the upstream side.

In this case, as shown in FIG. 8A, the wiring unit 10D is connected to the connection position (first connection position) between the wiring unit 10A and the wiring unit 50. FIG. Then, after switching the cam switch 34s to the contact b side to cut off the connection between the upstream side and the downstream side of the main cable M5, the insulation state of the upstream side and the downstream side of the conductor wires W2 to W5 in the main cable M5. Check the state of insulation. Then, the upstream side of the wiring unit 10D is in an insulated state (indicated by "◯" in the drawing), and the downstream side of the wiring unit 10D is in an insulation failure state (indicated by "x" in the drawing).

Further, as shown in FIG. 8B, the wiring unit 10D is connected to the connection position (second connection position) between the wiring unit 50 on the upstream side and the wiring unit 50 on the downstream side. Then, after switching the cam switch 34s to the contact b side to cut off the connection between the upstream side and the downstream side of the main cable M5, the insulation state of the upstream side and the downstream side of the conductor wires W2 to W5 in the main cable M5. Check the state of insulation. Then, the upstream side of the wiring unit 10D is in an insulation failure state (indicated by "x" in the figure), and the downstream side of the wiring unit 10D is in an insulated state (indicated by "o" in the figure). Then, it can be determined that there is an insulation defect in the trunk cable M1 (here, the conductor wire W5 in the trunk cable M1) of the wiring unit 50 in the section sandwiched between the first connection position and the second connection position. can.

Further, as shown in FIG. 8C, the connection position (first connection position) between the wiring unit 10A and the wiring unit 50 and the connection position (first connection position) between the upstream wiring unit 50 and the downstream wiring unit 50 ( 2nd connection position) and wiring unit 10D are each connected. Then, in each of the first and second connection positions, the cam switch 34s is switched to the contact b side to cut off the connection between the upstream side and the downstream side of the trunk cable M5, and then the conductor wire W2 in the trunk cable M5 is turned on. to W5, the insulation state of the upstream side and the insulation state of the downstream side are confirmed. Then, at the first connection position, the upstream side of the wiring unit 10D is insulated (indicated by "○" in the drawing), and the downstream side of the wiring unit 10D is in the poor insulation state (indicated by "x" in the drawing). At the second connection position, the upstream side of the wiring unit 10D is in an insulation failure state (indicated by "x" in the figure), and the downstream side of the wiring unit 10D is in an insulated state (indicated by "o" in the figure). Then, it can be determined that there is an insulation defect in the trunk cable M1 (here, the conductor wire W5 in the trunk cable M1) of the wiring unit 50 in the section sandwiched between the first connection position and the second connection position. can.

[Summary of how to check the insulation failure section]
The main points of the method for checking the insulation failure section described above are summarized as follows.
(1)
The wiring unit 10D is connected as an additional wiring unit to the first connection position and the second connection position with one or more trunk cables interposed among the plurality of trunk cables.
(2)
At each of the first connection position and the second connection position, in the wiring unit 10D, the upstream side (first end side) and the downstream side (second end side) of the conductor wires W2 to W5 of the trunk cable M5 ).
(3)
In the first connection position, the first end side is in an insulated state and the second end side is in an insulation failure state, and in the second connection position, the first end side is in an insulation failure state and the second end side If the side is insulated, it can be determined that there is an insulation failure in any one or more of the trunk cables.

[effect]
The wiring system 100C includes wiring units 10D for switching its trunk cables. Like the wiring units 10A and 10B, the wiring unit 10D can be easily connected to any position between the wiring units 40, 50 and 70 even after the wiring units 40, 50 and 70 are installed. Also, unlike the wiring units 10A and 10B, any number of wiring units 10D may be installed. Therefore, in the wiring system 100C, it is possible to provide the switch 30D at a desired position, change the position of the switch 30D, or increase the number of switches 30D. By switching the cam switch 34s of the switch 30D to the contact b side at a desired position of the wiring system 100C, the connection between the upstream side and the downstream side of the trunk cable M5 is cut off, and the upstream side and the downstream side are insulated. You can check the status. In this way, an insulation failure section can be confirmed.

In particular, in the case of this modified example, when the connectors C1 and C2 are located at locations where they cannot be easily removed, as shown in FIG. Confirmation of insulation failure is enabled at switch 30D. For example, if the connectors C1 and C2 are located in a high place or a narrow place out of reach of the operator, the connectors C1 and C2 cannot be easily removed. and downstream insulation fault checking is enabled at switch 30D.

It should be noted that the above-described embodiments are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be construed to be limited by these. Accordingly, the present invention may be embodied in various forms without departing from its spirit or essential characteristics.

For example, a terminal box may be used instead of the connectors C1 and C2 in the above embodiment.

10A, 10B, 10C, 10D wiring unit 21, 22, 23, 24 switch cable 30A, 30B three-way switch 30C four-way switch 30D switch 40, 50, 60, 70 wiring unit 51 branch cable 52 lighting equipment 100A, 100B, 100C wiring system M1, M2, M3, M4, M5 Trunk cable

Claims (11)

A wiring unit that connects between main cables,
a first cable having a conductor wire connecting the main cables;
One end branches from the first cable and extends from the one end to the other end, the other end is connectable to a switch, and the one end is connected to the conductor wire of the first cable. a second cable having connecting conductor lines;
with
The connection conductor wire of the second cable is connected to the conductor wire of the first cable so that the connection state between the main cables can be changed by operating the switch.
wiring unit. The connection conductor wire of the second cable is arranged such that the first end side of the first conductor wire of the first cable is the second end side of the first conductor wire or the first end portion side of the first conductor wire. changeably connected to a connection with a second conductor line of the cable;
The wiring unit according to claim 1. The connection conductor wire of the second cable connects either the first conductor wire of the first cable or the second conductor wire of the first cable to the third conductor wire of the first cable. mutably connected to the connection with the conductor wire,
The wiring unit according to claim 1. The connection conductor wire of the second cable connects the first conductor wire of the first cable and the second conductor wire of the first cable so as to be changeable to a straight connection or a cross connection. there is
The wiring unit according to claim 1. The connection conductor wire of the second cable connects or disconnects between the first end side and the second end side of the plurality of conductor wires of the first cable. connected as possible,
The wiring unit according to claim 1. The connection conductor wire of the second cable includes a first terminal that becomes the first end side when disconnecting between the first end side and the second end side, and the A second terminal on the second end side,
The wiring unit according to claim 5. the length of the first cable is shorter than the length of the main cable;
The wiring unit according to any one of claims 1 to 6. a plurality of main cables;
A wiring unit according to claim 2;
A wiring unit according to claim 3;
comprising
wiring system. Further comprising the wiring unit according to claim 4 arranged between the wiring unit according to claim 2 and the wiring unit according to claim 3,
9. The wiring system of claim 8. Further comprising the wiring unit according to claim 6,
10. Wiring system according to claim 8 or 9. A method for checking an insulation failure section in a wiring system according to claim 10,
connecting the wiring unit according to claim 6 as an additional wiring unit to a first connection position and a second connection position in which any one of the plurality of main cables is interposed;
At each of the first connection position and the second connection position, in the additional wiring unit, the first end side and the second end side of the conductor wire of the first cable disconnects the
At the first connection position, the first end side is in an insulation state and the second end side is in an insulation failure state, and at the second connection position, the first end side is in an insulation failure state and When the second end side is insulated, it is possible to determine that there is an insulation defect in one of the main cables,
How to check the insulation failure section.

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