JP2009213323A - Insulator for holding conductor of air-insulated bus duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulator for holding a conductor which surely fixes a bus bar inside a bus duct housing even if the bus bar is placed in a tilted state and increases the heat dissipation efficiency for heat generated from the bus bar to hold down an increase in temperature of the bus bar. <P>SOLUTION: The insulator for holding a conductor is arranged near plug-in holes formed at predetermined intervals and fixes at least one conductor stored inside the bus duct housing. The insulator consists of a first insulator on the plug-in hole side and a corresponding second insulator on the opposite side, which fix the conductor between them. The first and second insulators are each equipped with plural pairs of wall face portions corresponding to each insulator, which are disposed vertical to the conductor. The wall face portions are spaced apart by a predetermined distance from the long axis of the conductor and are each equipped with a concave portion for receiving and fixing the conductor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a conductor holding insulator that fixes an electric conductor in a bus duct housing that houses the electric conductor, and more particularly to a conductor holding insulator for an air-insulated bus duct.

  In a structure such as a high-rise building, a bus duct is used to configure an electric trunk line. Unlike ordinary cables, bus ducts have large loads and rigidity. In general, a bus duct is a housing in which a plurality of insulated conductors configured by covering an electric conductor with an insulating material are housed and held in a housing. Compared to a wiring system that bundles and wires multiple cables, this bus duct has extremely superior functions for preventing fires and preventing leakage magnetic flux, so it can be used as a main power supply line for factory facilities and buildings. Widely used.

The air-insulated bus duct is obtained by arranging a plurality of bare bus bars in parallel through an insulator in a metal duct. The length of one unit of the bus duct is generally 2.5 m or 3 m, and a plurality of units of the bus duct are connected to be used as a power line in a factory or the like. A plug-in device or a bolt-on device (hereinafter collectively referred to as a plug-in device) is attached to a location where an electrical branch is taken from the bus duct. A plug-in hole is formed in the duct at a portion where the plug-in device is attached. A plurality of plug-in holes are formed at an appropriate interval in a bus duct of one unit, and the plug-in hole to which a plug-in device is not attached is closed with a hole cover.

  Specific examples of bus ducts having a conventional plug-in hole are shown in FIGS. FIG. 8 is a diagram illustrating an example of a bus duct having a conventional plug-in hole. FIG. 8A is a front view, and FIG. 8B is a bottom view. As shown in FIG. 8, the metal duct 100 is a housing having a substantially rectangular cross section including a front plate 101a, a back plate 101b, an upper plate 101c, and a lower plate 101d. Bare bus bars 102A, 102B, and 102C made of a strip-shaped conductor are housed in the duct. A plurality of bus bars 102A to 102C are supported in parallel in the duct 100 by the insulators 103a and 103b.

  Plug-in holes 104 are alternately formed in the front plate 101a and the back plate 101b of the duct 100 at predetermined intervals in the longitudinal direction. The plug-in hole may be formed only on the front plate of the duct. The plug-in hole 104 is a part to which a plug-in device is attached, and all plug-in holes 104 are closed with a hole cover 105 as shown in FIG. When the plug-in device is attached after the power supply line is constructed at the delivery destination, the hole cover 105 at that portion is removed and the plug-in device is attached.

FIG. 9 is a view showing a main part of the bus duct shown in FIG. 9A is a partially cut front view, FIG. 9B is a plan view, FIG. 9C is a cross-sectional view taken along the line CC, and FIG. 9D is a cross-sectional view taken along the line DD.
As shown in FIG. 9, the insulator 103 is divided into an insulator 103a on the plug-in hole 104 side and an insulator 103b on the opposite side. Both insulators 103a and 103b are provided with bus bar mounting grooves 106 at opposing positions, and both sides of the bus bars 102A to 102C are sandwiched and fixed by the groove 106. FIG. 10 is a diagram illustrating an insulator on the plug-in hole side. In the example shown in FIG. 9, both insulators 103a and 103b are formed in a rectangular tube shape, and the insulator 103a on the plug-in hole 104 side has a plug-in hole 104 side as shown in FIG. A rib 107 protrudes from the inner peripheral portion of the end face. The insulator 103a on the plug-in hole 104 side is installed in the duct 100 with the rib 107 fitted into the plug-in hole 104 as shown in FIG. Since the opposite insulator 103b is also installed at the same position in the longitudinal direction of the duct, the plug-in hole 104 is surrounded by an insulator wall.

  The height of the rib 107 is set slightly higher than the thickness of the metal plate constituting the duct 100. For this reason, when the rib 107 is fitted into the plug-in hole 104, the tip of the rib 107 slightly protrudes from the surface of the duct 100. The hole cover 105 is formed with a rectangular bulging portion 108 so that the protrusion of the rib 107 can be absorbed. The periphery of the hole cover 105 is flat so as to come into surface contact with the surface of the duct 100.

JP 2004-229358 A

When the bus duct is energized, the bus bar generates heat. In a bus duct having an air-insulated plug-in hole, heat generated in the bus bar is transmitted to the duct and hole cover through the air in the duct, and is radiated from the surface of the duct and hole cover to the atmosphere. However, heat transfer from the bus bar to the duct and the hole cover is heat transfer through the air confined in the duct, and therefore the heat dissipation efficiency is poor. For this reason, it is difficult for the conventional plug-in bus duct to suppress the temperature rise of the bus bar.
Further, since the bus bar made of the strip plate conductor is inserted into the bus bar mounting groove 106 formed in the insulators 103a and 103b and is sandwiched from both sides, the bus bar extends along the major axis direction. If it is easy to move and the bus bars are displaced from each other or inclined, the bus bars are detached from the insulator and have to be reassembled.

  An object of the present invention is to provide a conductor in which a bus bar is securely fixed in a bus duct housing even in an inclined state, and the heat dissipation efficiency of heat generated by the bus bar can be enhanced to keep the temperature rise of the bus bar low. It is to provide a holding insulator.

  The present inventor has intensively studied to solve the conventional problems described above. As a result, the following was found. An insulator made of a corresponding second insulator on the opposite side of the first insulator on the plug-in hole side, sandwiching and fixing the conductor, is prepared, and the first insulator and the second insulator on both sides of the plug-in hole If at least one pair of wall surfaces (two on each side, total of four) are provided on each of the two, and the groove portion sandwiching the conductor is provided on the wall surface portion so that the center line is shifted, the conductor is zigzag by the wall surface portion of the insulator. Since the portion of the conductor held and in contact with the wall surface is in a pressurized state, it has been found that the conductor is firmly fixed and prevented from moving in the major axis direction.

  Furthermore, a space is provided between the respective wall surfaces of the first insulator and the second insulator, the height of the wall surface portion is changed, and a communication space portion through which air flows between the conductor around the plug-in hole and the insulator By providing the air, the outside air can flow into the bus duct housing, or the heat of the conductor can flow to the outside by the air in the bus duct housing, so that the heat dissipation efficiency can be increased and the temperature rise of the conductor can be kept low. found.

The present invention has been made on the basis of the above research results. The first aspect of the conductor holding insulator according to the present invention is arranged in the vicinity of a plug-in hole formed at a predetermined interval, and is a bus duct housing. An insulator for fixing a plurality of conductors housed inside,
The insulator includes a corresponding second insulator on the opposite side to the first insulator on the plug-in hole side, which sandwiches and fixes the conductor, and the first insulator and the second insulator include the conductor. A plurality of corresponding wall portions arranged perpendicularly to each other,
The wall surface portion is a conductor holding insulator provided with a groove portion that is positioned at a predetermined distance from the long axis of the conductor and receives and fixes the conductor.

  According to a second aspect of the conductor holding insulator of the present invention, the groove portion, which is located on the wall surface portion with a predetermined distance from the long axis of the conductor and receives and fixes the conductor, The conductor is an insulator for holding a conductor that is shifted in a vertical direction with respect to the major axis direction, and the conductor is held in a zigzag manner by the wall surface portion of the insulator.

  According to a third aspect of the conductor holding insulator of the present invention, the first insulator and the second insulator each correspond to a rectangular frame portion, the wall surface portion, and an opening corresponding to the plug-in hole. The wall surface portion is a conductor holding insulator that is disposed symmetrically with respect to the opening.

  According to a fourth aspect of the conductor holding insulator of the present invention, the wall surface portion is made of a substantially L-shaped plate material formed by removing one corner of a generally rectangular plate material, and has a high L-shaped portion. The lower portions are alternately arranged along the long axis direction of the conductor, and the L-shaped high portion has a deep groove portion, and the L-shaped low portion has a shallow groove portion.

  According to a fifth aspect of the conductor holding insulator of the present invention, a corresponding L-shaped low portion of the wall surface portion of the second insulator is disposed in the L-shaped high portion of the wall surface portion of the first insulator. A conductor holding insulator in which a corresponding L-shaped high portion of the wall surface portion of the second insulator is disposed in a low L-shaped portion of the wall surface portion of the first insulator.

  According to a sixth aspect of the conductor holding insulator of the present invention, the first insulator and the second insulator are opposite to each other on the same side in the L-shaped high portion of the wall surface portion close to the opening. This is a conductor holding insulator in which the L-shaped high portions of the adjacent wall surface portions are located opposite to each other on the same side.

  According to a seventh aspect of the conductor holding insulator of the present invention, the first insulator forms a communication space portion through which the air inside and outside the housing passes around the opening corresponding to the plug-in hole. The first insulator and the second insulator are conductor holding insulators, each having a protrusion space, and a communication space portion through which air passes in a central portion of an L-shaped high portion of each wall surface portion. is there.

  According to an eighth aspect of the conductor holding insulator of the present invention, the first insulator and the second insulator each include a concavo-convex portion corresponding to the concavo-convex portion of the housing, and are fixed in the housing, It is a conductor holding insulator that fixes the conductor in a state where a part of the groove is pressed against the conductor.

  According to a ninth aspect of the conductor holding insulator of the present invention, the first insulator and the second insulator are inside the pair of members forming the housing in a state where the conductor is fixed by the groove. When the force is applied in the direction perpendicular to the long axis of the housing by matching the corresponding surfaces of the tip portions of the pair of members, the housing is combined so as to be irreversibly fitted. An insulator for holding a conductor.

  According to a tenth aspect of the conductor holding insulator of the present invention, the first insulator and the second insulator are connected to the inside of a pair of members forming a housing in a state where the conductor is fixed by the groove. When the force is applied in the direction perpendicular to the long axis of the housing by matching the corresponding surfaces of the tip portions of the pair of members, the housing is combined so as to be irreversibly fitted. An insulator for holding a conductor.

  According to the present invention, an insulator made of a corresponding second insulator on the opposite side to the first insulator on the plug-in hole side, which sandwiches and fixes the conductor, is prepared, and the first insulator on both sides of the plug-in hole is prepared. Each of the second insulator and the second insulator is provided with at least one pair of wall surfaces (two on each side, total of four), and a groove portion sandwiching the conductor is provided on the wall surface portion so that the center line is shifted. The portion of the conductor that is held in a zigzag manner by the wall surface of the object and is in contact with the wall surface is in a pressurized state, and the conductor is firmly fixed and prevented from moving in the major axis direction. Can do.

  According to the present invention, even when in an inclined state, the bus bar is securely fixed in the bus duct housing, and the heat retention efficiency of the heat generated by the bus bar can be increased, and the temperature rise of the bus bar can be kept low. Insulators can be provided.

The embodiment of the conductor holding insulator of the present invention will be described in detail with reference to the drawings.
One aspect of the conductor holding insulator according to the present invention is an insulator that is disposed in the vicinity of a plug-in hole formed at a predetermined interval and fixes at least one conductor housed inside a bus duct housing. The insulator comprises a corresponding second insulator on the opposite side of the first insulator on the plug-in hole side, which is fixed by sandwiching the conductor, and the first insulator and the second insulator are arranged perpendicular to the conductor A plurality of pairs of corresponding wall surface portions, the wall surface portions being located at a predetermined distance from the major axis of the conductor, and having a groove portion for receiving and fixing the conductor, a conductor holding insulator It is.

  FIG. 1 is a perspective view for explaining one embodiment of the first insulator of the conductor holding insulator of the present invention. FIG. 2 is a perspective view for explaining one embodiment of the second insulator of the conductor holding insulator of the present invention. The conductor holding insulator 40 is composed of the first insulator 10 and the second insulator 20, and is disposed in the vicinity of the plug-in hole formed at a predetermined interval, and is accommodated in the bus duct housing. This is an insulator for fixing 30. The first insulator 10 and the second insulator 20 are respectively provided with corresponding rectangular frame portions 19 and 29, wall surfaces, and openings corresponding to plug-in holes.

  As shown in FIG. 1, the first insulator 10 on the plug-in hole side includes a rib 15 corresponding to the plug-in hole at the center of one surface. The first insulator 10 includes a frame portion 19 and four wall surface portions 11, 12, 13, and 14. Although not clearly shown in the drawing, the wall surface portions 11, 12, 13, and 14 are arranged symmetrically with respect to the opening. The first insulator 10 includes a projecting portion 35 that forms a communication space portion through which the air inside and outside the housing passes around the opening corresponding to the plug-in hole. The first insulator 10 and the second insulator 20 includes a communication space portion 37 through which air passes at the center of each L-shaped high portion of each wall surface portion.

  As shown in FIG. 2, the first insulator 20 includes a frame portion 29 and four wall surface portions 21, 22, 23, and 24. As apparent from FIG. 2, the wall surface portions 21, 22, 23, and 24 are arranged symmetrically with respect to the opening.

  As shown in FIG. 2, the wall surfaces 21, 22, 23, and 24 of the second insulator are each made of a substantially L-shaped plate material formed by removing one corner of a substantially rectangular plate material. The L-shaped high and low portions are alternately arranged along the long axis direction of the conductor, and the L-shaped high portions include deep grooves 28-1, 26-2, 26-3, 28-4, and L The lower part of the character shape is provided with shallow grooves 26-1, 28-2, 28-3, 26-4.

  FIG. 3 is an exploded perspective view illustrating the conductor holding insulator according to the present invention. As shown in FIG. 3, the first insulator 10 and the second insulator 20 are disposed to face each other, and the conductor 30 is inserted into each corresponding groove and fixed. That is, a corresponding L-shaped low portion of the wall surface portion of the second insulator is disposed in the L-shaped high portion of the wall surface portion of the first insulator, and a L-shaped low portion of the wall surface portion of the first insulator is disposed. The corresponding L-shaped high portion of the wall surface of the second insulator is disposed.

  Specifically, one side surface (upper side in the drawing) of the conductor 30-1 is inserted into the groove portions 16-1, 16-2, 16-3, 16-4 (not shown) of the first insulator, The other surface (lower side in the figure) of the conductor 30-1 is inserted into the groove portions 26-1, 26-2, 26-3, and 26-4 of the two insulators. The center lines of the grooves 26-1 and 26-2 of the second insulator are slightly shifted, and the center lines of the grooves 26-3 and 26-4 are also slightly shifted. Similarly, the center lines of the grooves 16-1 and 16-2 of the first insulator are slightly shifted, and the center lines of the grooves 16-3 and 16-4 are also slightly shifted. By slightly shifting the center line from each other, the conductor is pressed by the inner surface of the groove and held in a zigzag manner.

  Similarly, one side surface (upper side in the drawing) of the conductor 30-2 is inserted into the groove portions 17-1, 17-2, 17-3, 17-4 (not shown) of the first insulator, and the second insulation The other surface (lower side in the figure) of the conductor 30-2 is inserted into the groove portions 27-1, 27-2, 27-3, 27-4 of the object. Furthermore, one side surface (upper side in the figure) of the conductor 30-3 is inserted into the groove portions 18-1, 18-2, 18-3, 18-4 (not shown) of the first insulator, and the second insulator The other surface (lower side in the figure) of the conductor 30-3 is inserted into the groove portions 28-1, 28-2, 28-3, 28-4.

  FIG. 4 is a diagram illustrating a wall surface portion. 4 (a) shows the corresponding wall surface portions of the first insulating portion and the second insulating portion on the plug-in hole side, and FIG. 4 (b) is the first insulating portion adjacent to it (the side away from the plug-in hole). And the corresponding wall surface of the second insulating part. With reference to FIG. 4, the arrangement | positioning condition of the wall surface part mentioned above is demonstrated. As shown in FIG. 4A, the wall surface portion of the second insulator 20 (none in the drawing) is placed on the L-shaped high portion 31 of the wall portion 12 of the first insulator 10 (none in the drawing) on the left side in the drawing. 22 corresponding L-shaped low portions 32 are disposed relative to each other, and the L-shaped low portion 32 of the wall surface portion 11 of the first insulator 10 is disposed on the corresponding L-shaped portion of the wall surface portion 21 of the second insulator 20. The high portions 31 are arranged relative to each other.

  FIG. 5 is a diagram for explaining the shift of the groove with reference to the second insulator. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a side view. FIG.5 (c) has shown the state which looked at the wall surface parts 21 and 22 of the 2nd insulator from the side surface. As is apparent from FIG. 5C, the L-shaped high portion 31 of the wall surface portion 22 on the plug-in hole side corresponds to the L-shaped low portion 32 of the adjacent wall surface portion 21, and the wall surface on the plug-in hole side. The L-shaped high portion 31 of the wall portion 21 adjacent to the L-shaped low portion 32 of the portion 22 is arranged correspondingly.

  By alternately arranging the high and low portions of the L shape along the length of the conductor in this way, a sufficient space can be secured, the air flow in the housing is facilitated, and the temperature rise of the conductor is suppressed. Easy to set. The groove is slightly shifted in the direction indicated by the arrow in FIG. That is, the wall surface portion 21 and the wall surface portion 23 are shifted to the upper side in the drawing, and the wall surface portion 22 and the wall surface portion 24 are shifted to the lower side in the drawing to pressurize the conductor.

The conductor holding insulator of the present invention can be used in combination with the bus duct housing shown in FIG. That is, as described above, the inner surface of the groove pressurizes the conductor by slightly shifting the groove portions of the first insulator and the second insulator. Secure in the bus duct housing in that state.
The bus duct housing shown in FIG. 6 is coupled by one-touch when a fitting portion is provided at the opposite tip portions of the pair of housing members 2 and 3 and the surfaces of the corresponding tip portions are pushed together.

That is, the housing 1 includes a pair of opposing first and second members 2 and 3 having a generally U-shaped cross section. The first member 2 and the second member 3 are fitted to each other to form a rectangular space having a conductor 30 and an insulator 40 for fixing the conductor 30 therein. That is, the fitting can be easily performed with one touch. However, once it is joined, it has a structure that does not come off, so it is highly reliable.
The fitting portion described above includes a first fitting portion 4 and a second fitting portion 5. The first fitting portion 4 includes a first end 6 of the first member 2 and a first end 7 of the second member 3. Similarly, the second fitting portion 5 includes a second end portion 8 of the first member 2 and a second end portion 9 of the second member 3. The first end portions 6 and 7 and the second end portions 8 and 9 each have a corresponding flat surface and an inclined surface having a front end portion and a recessed portion to be fitted.

  Since the conductor 30 housed in the housing 1 and the insulator 40 for fixing the conductor 30 are fixed by the side wall portion of the housing, the insulator is fixed in a state where the groove portion is slightly shifted as described above. On the other hand, since the conductor fixed in this way and the insulator that fixes the conductor prevent the first member 2 and the second member 3 from moving inward of the housing, they are firmly fitted and not detached. It has sufficient strength. That is, the fitting is ensured that the conductor and the insulator for fixing the conductor have a function of preventing the movement of the first member 2 and the second member 3 toward the inside of the housing.

  FIG. 7 is a cross-sectional view illustrating a bus duct in which a conductor and an insulator for fixing the conductor are accommodated. As shown in FIG. 7, the air-insulated bus duct includes a plurality of conductors (bare bus bars) 30-1, 30-2, 30-3 through an insulator 40 (not shown) in a metal housing 1. Are arranged in parallel. Usually, a plug-in device or a bolt-on device is attached at a location where an electrical branch is taken from the bus duct, and a plug-in hole is formed in the bus duct at a portion where the plug-in device or the like is attached. The insulator 40 is divided and arranged on the second member 3 side of the housing provided with the plug-in hole and the first member 2 side on the opposite side. Thus, the three conductors 30 are disposed and fixed in the housing 1 by being sandwiched from both sides by the divided insulator 40.

Protruding portions are provided on the outer sides of the first fitting portion and the second fitting portion, respectively, and the fitting is disengaged between the protruding portions and the outer flat surfaces of the first fitting portion and the second fitting portion. You may provide the prevention reinforcement board | plate material.
In the embodiment shown in FIG. 7, the protrusions 33 are provided at both ends of the fitting parts 4 and 5, and the plate material 34 is placed in the vertically long space formed by the flat surfaces of the fitting parts 4 and 5 and the protrusions 33. Has been inserted. As described above, when the plate member is inserted into the space formed by the protrusion and the outer surface of the fitting portion, even if an unexpected force is applied from the outside, it is possible to reliably prevent the fitting from coming off.

Accordingly, the shapes of the tip and the recess that are fitted to each other are designed so that they are easily coupled by pressing and cannot be removed. In particular, the shape of the boundary portion between the tip portion and the concave portion needs to have a retrograde prevention function so that it can be easily pushed in and does not come off even when a force in the opposite direction is applied.
In the bus duct housing according to the present invention, the insulator housed in the interior for fixing the conductor prevents inward deformation of the first member and the second member in addition to the original insulation function. This ensures a so-called irreversible fitting that is easy to connect but difficult to come off.

  The first member and the second member are fitted so as not to be disengaged in the fitting, but the first member and the second member are joined to the first fitting portion and the second fitting along the long axis direction. Can be slid to release the fitting. That is, the fitting can be released by sliding in the long axis direction of the housing while the front end portion and the concave portion of the corresponding size remain fitted.

In the aspect mentioned above, although the board thickness of the 1st fitting part and the 2nd fitting part is set larger than the board thickness of another part, the board of the 1st fitting part and the 2nd fitting part The thickness may be the same as the thickness of the other portions.
The housing for the bus duct described above is not limited to the form shown in the drawing, and in particular, the fitting portion may have any shape as long as the shape can fulfill the above-described function.

  As described above, according to the present invention, the bus bar is securely fixed in the bus duct housing even in an inclined state, the heat dissipation efficiency of the heat generated by the bus bar is increased, and the temperature rise of the bus bar is kept low. It is possible to provide an insulator for holding a conductor.

FIG. 1 is a perspective view for explaining one embodiment of the first insulator of the conductor holding insulator of the present invention. FIG. 2 is a perspective view for explaining one embodiment of the second insulator of the conductor holding insulator of the present invention. FIG. 3 is an exploded perspective view illustrating the conductor holding insulator according to the present invention. FIG. 4 is a diagram illustrating a wall surface portion. 4 (a) shows the corresponding wall surface portions of the first insulating portion and the second insulating portion on the plug-in hole side, and FIG. 4 (b) is the first insulating portion adjacent to it (the side away from the plug-in hole). And the corresponding wall surface of the second insulating part. FIG. 5 is a diagram for explaining the shift of the groove with reference to the second insulator. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a side view. FIG.5 (c) has shown the state which looked at the wall surface parts 21 and 22 of the 2nd insulator from the side surface. FIG. 6 is a cross-sectional view illustrating a bus duct housing. FIG. 7 is a cross-sectional view illustrating a bus duct in which a conductor and an insulator for fixing the conductor are accommodated. FIG. 8 is a diagram illustrating an example of a bus duct having a conventional plug-in hole. FIG. 9 is a view showing a main part of the bus duct shown in FIG. 9A is a partially cut front view, FIG. 9B is a plan view, FIG. 9C is a cross-sectional view taken along the line CC, and FIG. 9D is a cross-sectional view taken along the line DD. FIG. 10 is a diagram illustrating an insulator on the plug-in hole side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bus duct housing 2 1st member 3 2nd member 4 1st fitting part 5 1st fitting part 6 1st end part 7 of 1st member 1st end part 8 of 2nd member 2nd end of 1st member Part 9 Second end 10 of second member 10 First insulators 11, 12, 13, 14 Wall part 15 Ribs 16, 17, 18 Groove part 19 Frame part 20 Second insulators 21, 22, 23, 24 Wall part 26 27, 28 Groove portion 30 Conductor 31 L-shaped high portion 32 L-shaped low portion 33 Projection portion 34 Plate member 35 Projection portion 37 Communication space portion 40 Insulator

Claims (9)

An insulator that is disposed in the vicinity of a plug-in hole formed at a predetermined interval and fixes a plurality of conductors housed inside a bus duct housing,
The insulator includes a corresponding second insulator on the opposite side to the first insulator on the plug-in hole side, which sandwiches and fixes the conductor, and the first insulator and the second insulator include the conductor. A plurality of corresponding wall portions arranged perpendicularly to each other,
The insulator for holding a conductor, wherein the wall surface part is provided with a predetermined distance from the major axis of the conductor and includes a groove part for receiving and fixing the conductor.   The groove portion, which is located on the wall surface portion with a predetermined distance from the major axis of the conductor and receives and fixes the conductor, is shifted in a direction perpendicular to the major axis direction of the conductor, The conductor holding insulator according to claim 1, wherein the conductor is held in a zigzag manner by the wall surface portion of the insulator.   The first insulator and the second insulator each include a corresponding rectangular frame, the wall surface, and an opening corresponding to the plug-in hole, and the wall surface is symmetrical with respect to the opening. The conductor holding insulator according to claim 1 or 2, which is arranged.   The wall surface portion is made of a substantially L-shaped plate material formed by removing one corner of a generally rectangular plate material, and the L-shaped high portion and the low portion are alternately arranged along the major axis direction of the conductor. The conductor holding insulator according to claim 1, wherein the L-shaped high portion includes a deep groove portion, and the L-shaped low portion includes a shallow groove portion.   A corresponding L-shaped low portion of the wall surface portion of the second insulator is disposed in an L-shaped high portion of the wall surface portion of the first insulator, and an L-shaped low portion of the wall surface portion of the first insulator. The conductor holding insulator according to claim 4, wherein a corresponding L-shaped high portion of the wall surface portion of the second insulator is disposed.   In the first insulator and the second insulator, the L-shaped high portion of the wall surface portion on the side close to the opening is positioned oppositely on the same side, and the L-shaped high portion of the adjacent wall surface portion is The insulator for holding a conductor according to any one of claims 1 to 5, wherein the insulator is disposed opposite to each other on the same side.   The first insulator includes a protrusion that forms a communication space that allows air inside and outside the housing to pass around an opening corresponding to the plug-in hole, and the first insulator and the second insulator. 7. The conductor holding insulator according to claim 1, wherein the object includes a communication space portion through which air passes in a central portion of each L-shaped high portion of each wall surface portion.   Each of the first insulator and the second insulator includes a concavo-convex portion corresponding to the concavo-convex portion of the housing, and is fixed in the housing, and a part of the groove portion is pressed against the conductor. The insulator for holding a conductor according to any one of claims 1 to 7, wherein the insulator is fixed. The first insulator and the second insulator prevent the inward deformation of the pair of members forming the housing in a state where the conductor is fixed by the groove, and the tip portions of the pair of members are respectively 9. A conductor according to any one of claims 1 to 8, wherein the housing is combined so that the housing is irreversibly mated when forces are applied in the direction perpendicular to the long axis of the housing together with corresponding surfaces. Retaining insulator.

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