KR100742292B1 - Earth structure for apartment house - Google Patents

Abstract

An earth structure of a distribution switchboard for an apartment house is provided to prevent accidents due to an electric leakage by sending a leakage current to the ground. An earth structure of a distribution switchboard for an apartment house includes an earth cable receiving vessel(30), a vessel supporting body, a return roller(40,41), a tension device, a fixing rail, a double plate operating rail(70), a single plate operating rail, and an earth cable guiding roller(90,91). The earth cable receiving vessel(30) has an earth cable receiving chamber, an outlet for an extended earth cable(33), a roller supporting plate horizontally extended from a base plate(31) in front of the outlet, and an earth cable stand at the bottom of the earth cable receiving chamber. The vessel supporting body is welded in a reinforcing frame(22) to horizontally support the bottom of the earth cable receiving vessel(30). The return roller(40,41) is attached at both surfaces of the extended earth cable(33). The tension device is installed on the roller supporting plate, supports the return rollers(40,41), and applies rotating power to the return rollers(40,41). The fixing rail has a bolt fixing unit(61) at a switchboard body(20), a curved line guiding unit formed toward a switchboard door, and a first stop pin(63) and a second stop pin at the curved line guiding unit. The double plate operating rail(70) is formed by welding a curved inner plate and a curved outer plate. The single plate operating rail has an earth cable connecting unit, a curved sliding unit, and a third stop pin(83) and a fourth stop pin(84) at the curved sliding unit. The earth cable guiding roller(90,91) is installed at the bolt fixing unit(61), and guides the extended earth cable(33) to the fixing rail.

Description

Earthing structure for apartment switchgear {Earth structure for apartment house}

1 is a view showing the structure of a general switchboard

Figure 2 is a perspective view of the closed state showing the grounding structure of the switchboard for a multi-family housing according to the present invention

Figure 3 is a perspective view of the open state showing the grounding structure of the switchboard for a multi-family housing according to the present invention

Figure 4 is an exploded perspective view of the upper side showing the structure of the ground bow lead container according to the invention

Figure 5 is an exploded perspective view of the bottom side showing the structure of the ground bow lead container according to the invention

Figure 6 is an exploded perspective view of the upper surface showing the structure of the tension mechanism according to the invention

Figure 7 is an exploded perspective view of the bottom side showing the structure of the tension mechanism according to the present invention

Figure 8 is an exploded perspective view of the upper side showing the structure of the fixed rail and the leaf movable rail and single plate movable rail according to the present invention

Figure 9 is an exploded perspective view of the bottom side showing the structure of a fixed rail, a leaf movable rail and a single plate movable rail according to the present invention

Figure 10 is a cross-sectional plan view of the closed state showing the grounding structure of the switchboard for a multi-family housing according to the present invention

Figure 11 is a plan sectional view of the open state showing the grounding structure of the switchboard for a multi-family housing according to the present invention

Explanation of symbols on the main parts of the drawings

20: switchboard body 21: side frame

22: reinforcement frame 23: side plate

24: door hinge 25: switchboard door

30: ground bow lead container 31: base plate

32: conductive outer wall 33: extended ground wire

34: ground bow storage room 35: entrance

36: roller support plate 37: ground wire support plate

38: container support 40, 41: return roller

50: tension mechanism 51: housing

52: spring engaging step 53: spring locking groove

54: Manual spring 55: Sleeve

56: housing cover 57: spring center engaging end

58: spring coupling 59: spindle shaft

60: fixed rail 61: bolt fixing

62: curve guide 63: first stop pin

64: second stop pin 70: leaf movable rail

71: inner plate material 72: outer plate material

73: inner departure prevention jaw 74: outer departure prevention jaw

75: inner locking jaw 76: outer locking jaw

80: single plate movable rail 81: ground wire connection part

82: curved slide portion 83: third stop pin

84: fourth stop pin 90,91: ground wire guide roller

95: pin hole 96: annular locking groove

97: locking pin 98: bolt fixing flange

The present invention relates to a grounding structure of a switchboard for a multi-family housing used to allow a leaked current to flow to the ground through the ground bus of the switchgear main body when a short circuit occurs in the switchgear door. The present invention relates to a grounding structure of a switchboard for a multi-family house, in which an extension ground wire connected to a ground bus using a return roller is always kept taut to prevent an extension ground wire from being caught between the distribution panel door and the switchboard body.

In general, a distributing board is a device that manages by putting switches, relays, relays, etc. for the operation and control of electric devices such as power plants, substations, and public houses, and the operation of electric motors. There is a switchboard and a control panel.

There are two types of switchboards, open and closed. The open type shows the electrical wiring and switch terminals exposed on the back of the van, and the closed type is housed in a painted iron plate box. The only things you see are the minimal instruments and buttons. In the case of the open type, since the unit dimensions are standardized, the number of units is determined according to the scale of the substation.

A general switchboard 2 is divided into a main body 3 and a door 4 coupled to the main body 3 by a hinge 5, as shown in FIG. Mainly, various devices such as a high pressure vacuum circuit breaker or a low pressure air circuit breaker) 6, a current transformer (CT), and a transformer (VT) are installed, and the door 4 is equipped with an ammeter (7) and a voltmeter (8). Several electrical devices are installed, such as protective relays 9, indicator lights and switches.

In addition, the devices installed in the main body 3 and the devices installed in the door 4 are connected via wires, and electricity is always flowing through the wires.

Therefore, the main body portion 3 of the switchboard 2 should be provided with a separate grounding structure in accordance with the electrical construction laws to prevent an electric shock accident caused by a short-circuit phenomenon that may occur due to the flow of electricity, in general One side of the main body 3 of the switchboard 2 is provided with a separate ground bus bar (Earth bus bar) (10), through which the ground and ground can be.

However, in the case of the main body portion in the switchboard is to prevent an electric shock accident due to a short circuit through the ground bus, the door is not provided with a separate grounding means, the operator may be There was a problem of being exposed to the risk of electric shock.

The present invention has been made to solve the above problems, the object of the present invention is to provide a grounding structure of a switchboard for a multi-unit house so that the current leaked out when a short circuit occurs in the switchgear door can flow to the ground through the ground bus of the switchgear body. Is in.

In order to achieve the object of the present invention is formed in the ground lead storage for accommodating the extended ground line in the inner side of the conductive outer wall formed vertically along the edge of the base plate, the entrance to the entrance of the extension ground wire freely formed on the front side of the conductive outer wall A ground support lead container having a roller support plate extending horizontally from the base plate to the front side in front of the entrance, and having a ground wire support plate installed at the bottom of the ground lead storage room, the ground support plate being the same as the bottom height of the extension ground wire; A container support welded toward the inner side of the switchboard body in a reinforcement frame welded to the side frame of the switchboard body to horizontally support the bottom surface of the ground bow lead container; A return roller in close contact with both sides of the extension ground wire drawn out through the entrance formed in the ground bow lead container; A tension mechanism installed vertically on the upper surface of the roller support plate formed in the ground bow lead container to support the return rollers on both sides, and to apply a rotational force to the return roller in a direction to accommodate the extension ground wire in the ground bow lead room; A bolt fixing part fixed to the inner vertical surface of the side panel of the switchboard body is formed at one end, and at the other end, a curved guide part bent in an arc shape forming the same center as the center of rotation of the door hinge is formed horizontally toward the switchboard door. A fixed rail provided with first and second stop pins at both ends of the inner circumferential surface of the unit; It is formed by welding two inner plate members and an outer plate member bent in an arc shape, and the inner and outer release prevention jaws of the "L" shape that is caught on the upper and lower edges of the fixed rail and the following single plate movable rail are formed of the inner plate and the outer plate. It is formed along the upper and lower ends of the plate material, the inner engaging jaw and the outer engaging to reciprocate between the first stop pin and the second stop pin and the third stop pin and the fourth stop pin respectively formed on the fixed rail and the end plate movable rail, respectively A leaf movable rail formed so that the jaw protrudes downward from one side end of the inner release prevention jaw and the other end of the outer release prevention jaw; A ground wire connection part is formed at the other end fixed to the inner side of the switchboard door to fix the end of the extension ground wire, and the curved slide part is fitted to the outer plate of the laminated movable rail and is circularly moved to the same center as the rotation center of the door hinge. A single plate movable rail which is formed at and provided with third and fourth stop pins at both ends of the outer circumferential surface of the curved slide portion; Installed in the bolt fixing part formed on the fixed rail consisting of a ground wire guide roller for guiding the extended ground line passing through the return roller to the fixed rail is provided a grounding structure of the switchboard for the apartment house.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 11, the present invention includes a grounding lead container having a largely extended extended ground wire 33 and having a conductive outer wall 32 as an electrical conductor for conducting electricity to the ground bus 27. 30 and the tension mechanism 50 and the door hinge 24 for returning the extension ground wire 33 to the ground bow storage container 30 by the return rollers 40 and 41 when the extension ground wire 33 is relaxed. Curved multi-stage rail group having the same center of rotation as), the ground line guide rollers (90, 91) for guiding the extension ground line (33) passing through the return roller (40) (41) to the curved multi-stage rail group It is composed.

Here, the ground bow storage container 30 has a ground bow storage room 34 for accommodating the extension ground wire 33 on the inner side of the conductive outer wall 32 formed vertically along the edge of the base plate 31, and the conductive outer wall ( An entrance 35 freely entering and exiting the extension ground line 33 is formed at the front side of the 32, and a roller support plate 36 extending horizontally from the base plate 31 is formed in front of the entrance 35, and a ground line At the bottom of the storage room 34, a ground wire support plate 37 corresponding to the bottom height of the extension ground wire 33 is installed.

In addition, the ground bus 27 and the extension ground wire 33 are fixed to the inner and outer surfaces of the conductive outer wall 32 by bolts 28 and nuts 29 to extend the extension ground wire 33 from the ground bus 27. Current to flow.

In addition, a plurality of support rods 39 are installed on the bottom of the ground wire support plate 37 to support the ground wire support plate 37 by touching the bottom of the ground lead storage room 34. The reinforcing frame 22 is welded to the side frame 21 of the switchboard main body 20, and the container support 38, which is installed toward the inner side of the switchboard main body 20, is welded to the reinforcing frame 22. To support the bottom of the ground bow container 30 horizontally.

In addition, the container support 38 welds the reinforcing rib 38b to the corner portion of the L-shaped section steel 38a, and is welded to the side frame 21 of the switchboard body 20 outside the section steel 38a. The connecting member 38c is welded.

In addition, the return rollers 40 and 41 are in close contact with both sides of the extension ground wire 33 drawn out through the entrance 35 formed in the ground bow lead container 30, and slippage occurs between the extension ground wire 33. The outer circumferential surfaces of the return rollers 40 and 41 are formed in a sawtooth shape so as not to be so.

In addition, the tension mechanism 50 is vertically installed at intervals on the upper surface of the roller support plate 36 formed in the ground bow container 30 to support the return rollers 40 and 41 on both sides, and the extension ground wire 33 ) Is applied to the return rollers (40) and (41) in a direction to accommodate the ground bow storage room (34).

That is, the tension mechanism 50 is a housing 51 fixed to the upper surface of the roller support plate 36 and a spring that is received inside the housing 51 and is inserted into and caught in a spring engaging groove 53 formed in the housing 51. A spring 54 having an outer locking end 52 formed therein, a housing 55 formed in the center of the sleeve 55 and covering the housing 51, and a sleeve 55 formed in the housing cover 56 at the lower end thereof. Is inserted into the housing 51 through the spring engaging portion 58 is formed to be coupled to the spring center engaging end 57 formed in the center of the spring (54) and the upper end of the return roller (40) (41) Spindle shaft 59 inserted into the center and coupled to the return roller 40, 41, and the annular engaging groove 96 is inserted through the pin hole 95 formed in the sleeve 55 and formed in the spindle shaft 59 A locking pin 97 for restraining the axial movement of the spindle shaft 59 and a bolt fixing plan radially formed at the lower end of the outer surface of the housing 51; It consists of (98).

In addition, the coupling of the housing 51 and the housing cover 56 forms a plurality of hook catching jaws 51a on the outer circumferential surface of the housing 51, and the housing cover 56 has a unidirectional direction of catching the hook catching jaws 51a. When the hook hook 56a is installed to cover the housing cover 56 with the housing 51, the one-way hook hook 56a is caught by the hook catching jaw 51a, and the housing cover 56 and the housing 51 are coupled to each other. Let this be done.

In addition, the sleeve 55 formed in the housing cover 56 is provided with a catching hole 55a for inserting the catching pin 97, and the catching hole 55a is formed so as to pass through the edge of the pin hole 95. The locking pin 97 is caught by the annular locking groove 96 of the spindle shaft 59 inserted into the pin hole 95 of the sleeve 55.

In addition, the upper end of the spindle shaft 59 to form a chamfer (59m) to prevent the rotation by being caught by the shaft fixing bolt (40k) passing through the return roller 40, 41 at a right angle.

In addition, a bearing hole 51f is formed at the bottom of the housing 51 to support the lower end of the spindle shaft 59 so that the spindle shaft 59 rotates stably, and the return rollers 40 and 41 have a spindle. A shaft connection portion 40w having a hollow hole 40h for engagement with the shaft 59 is formed, and the shaft connection portion 40w has a screw hole 40v obtained by coupling the shaft fixing bolt 40k to the right angle of the shaft. It is formed to penetrate in the direction.

On the other hand, the curved multi-stage rail group is composed of a fixed rail 60, the leaf movable rail 70, the end plate movable rail 80, first, the fixed rail 60 is inside the side plate 23 of the switchboard body 20. A bolt fixing part 61 fixed to a vertical surface is formed at one end, and at the other end, a curved guide portion 62 bent in an arc shape having the same center as the center of rotation of the door hinge 24, the switchboard door 25. It is formed horizontally toward, and the first stop pin 63 and the second stop pin 64 are installed at both ends of the inner circumferential surface of the curved guide portion 62.

In addition, the laminated movable rail 70 is formed by welding two inner plate 71 and the outer plate 72, which are bent in an arc, in a stack, and the upper and lower edges of the fixed rail 60 and the end plate movable rail 80 The inner release prevention jaw 73 and the outer departure prevention 74 of the L-shaped shape are formed along the upper and lower ends of the inner plate 71 and the outer plate 72, and the fixed rail 60 and the end plate movable rail 80 Inner engaging jaw 75 and outer engaging respectively reciprocating between the first stop pin 63 and the second stop pin 64 and the third stop pin 83 and the fourth stop pin 84 respectively formed on the The jaw 76 is formed to protrude downward from one side end of the inner departure prevention jaw 73 and the other end of the outer departure prevention jaw 74.

In addition, the end plate movable rail 80 is formed with a ground wire connecting portion 81 for fixing an end of the extension grounding wire 33 at the other end fixed to the inner surface of the distribution panel door 25, and of the leaf movable rail 70. A curved slide portion 82 is inserted into the outer plate 72 and is circularly moved to the same center as the rotation center of the door hinge 24, and is formed at one end thereof, and third stops are provided at both ends of the outer circumferential surface of the curved slide portion 82. The pin 83 and the fourth stop pin 84 are installed.

In addition, the ground wire guide rollers 90 and 91 are supported by the roller support 93 installed on the bolt fixing part 61 formed on the fixed rail 60 and extend through the return rollers 40 and 41. Guide the ground wire 33 to the fixed rail (60).

That is, welding bent portions 61a and 61b for supporting the roller support 93 are formed on the bolt fixing portion 61 formed on the fixed rail 60, and welded bent portions (61) to the roller support 93 are provided. A rectangular groove 93g into which 61a and 61b is inserted is formed to insert the roller support 93 between the bent portions 61a and 61b for welding, and then the roller support 93 and the bent portion 61a for welding. 61b) is welded to the site where the roller support 93 is permanently installed in the bent portions 61a and 61b for welding.

In the center of the bolt fixing portion 61, a bolt hole 61h is formed in which the center of the bolt coincides with the bolt insertion hole 23h formed in the side plate 23 of the switchboard main body 20. The bolt fixing part 61 is fixed to the side plate 23 by the inserted bolt 61e.

In addition, in order to prevent the fixing rail 60 from sagging, another side sagging prevention hole 23s is formed in the side plate 23, and the screw fixing part 61 also has a screw hole 61s coinciding with the sagging prevention hole 23s. ) To firmly support the bolt fixing part 61 of the fixing rail 60 by the side plate 23 by the deflection prevention bolt (61t).

In addition, the grounding line guide rollers 90 and 91 are supported by fixing pins 93p vertically penetrating the spring-shaped engaging portions formed on the roller support 93 so that the horizontal grounding line 33 passes horizontally. do.

In addition, the ground line connecting portion 81 formed at the other end of the end plate movable rail 80 is bent in a channel form to form bending portions 81a and 81b surrounding the upper and lower ends of the extended grounding line fixing block 33a. In the block 33a, the extension ground wire 33, the ground wire connecting portion 81, and the switchboard door 25, fastening holes 33b, 33c, 81k, and 25k coincident with the center of the hole are formed so that the bolt 25a and The end plate movable rail 80, the extension grounding wire 33, and the extension grounding wire fixing block 33a are fixed to the switchboard door 25 by the nut 25b.

In addition, a cylindrical cylinder portion 33y is formed at the end of the extension grounding line fixing block 33a in contact with the extension grounding wire 33 to prevent the extension grounding wire 33 from being sharply bent. To prevent the bending portion of the extended grounding wire 33 to be cut out.

In the drawings, reference numerals 51m and 51n denote bolts and nuts for fixing the bolt fixing part 61 formed on the housing 51 of the tension mechanism 50 to the roller support plate 36 formed on the ground bow container 30. will be.

Hereinafter, the operation according to the present invention will be described in detail with reference to the accompanying drawings.

2 to 11, when the switchboard door 25 is opened, the single plate movable rail 80 connected to the switchboard door 25 is rotated along the switchboard door 25. The end plate movable rail 80 is curved-guided by the fixed rail 60 and the leaf movable rail 70 having the same center of rotation as the door hinge 24 so as not to interfere with the rotation of the distribution panel 25.

In addition, the extension ground wire 33, which is fixed to the ground wire connection portion 81 of the single plate movable rail 80 rotated along the distribution panel door 25, is pulled under tension, and the ground bow lead of the ground bow lead container 30 is pulled out. The extension ground wire 33 housed in the seal 34 passes through the return rollers 40 and 41 and then passes through the ground wire guide rollers 90 and 91 to the fixed rail 60 and the laminated movable rail 70. It is drawn out in close contact with the outer circumferential surface of the end plate movable rail 80 so that sag does not occur. When the distribution panel door 25 is opened larger, it is installed on the end plate movable rail 80 moving along the distribution panel door 25. The third stop pin 83 is caught by the outer catching jaw 76 formed on the outer plate member 72 of the leaf movable rail 70.

At this time, the leaf movable rail 70 is guided in a curve by the fixed rail 60 while being pulled by the end plate movable rail 80, the inner locking jaw 75 is installed on the leaf movable rail 70 is fixed rail ( The opening of the distribution panel door 25 is stopped while being caught by the second stop pin 64 provided at 60).

As described above, when the switchboard door 25 is opened, the tensioning force is applied by the return rollers 40 and 41 and the tension mechanism 50 to the extension ground wire 33 stored in the ground bow lead container 30. 33) is tensioned, and this action is when the tensile force is applied to the extension ground line 33, the return roller 40, 41 which is in close contact with both sides of the extension ground line 33 is rotated, wherein the return roller 40 The spring 50, which is built in the housing 51 by the spindle shaft 59 of the tension mechanism 50, which is coupled to the 41, extends in the opposite direction to the direction in which the extension ground wire 33 is pulled ( A tensile force is applied to 33 to maintain the extended ground wire 33 in a taut state.

That is, since the engaging pin 97 inserted into the sleeve 55 of the housing cover 56 is caught in the annular engaging groove 96 of the spindle shaft 59 on which the return rollers 40 and 41 are fixed. Only the rotational movement is possible on the spot and cannot move in the axial direction, thereby preventing the spindle shaft 59 from being separated from the housing cover 56.

Then, when a leakage current flows through the distribution panel door 25, the leakage current flows into the conductive outer wall 32 and the ground bus 27 of the ground lead container 30 through the extension ground line 33 grounded on the distribution panel door 25. Flows to alleviate the electric shock caused by a short circuit.

On the other hand, when the switchgear door 25 is closed in an open state, the end plate movable rail 80 and the leaf movable rail 70 are folded in sequence by the switchboard door 25. First, the end plate movable rail 80 is It is folded while being guided in a curve by the leaf movable rail 70, and the fourth stop pin 84 provided on the outer circumferential surface of the end plate movable rail 80 is an end of the outer plate 72 of the leaf movable rail 70. When caught in, this time the end plate movable rail 80 and the leaf movable rail 70 is folded at the same time.

Thereafter, the second stop pin 64 installed on the inner circumferential surface of the inner plate 71 of the laminated movable rail 70 is caught by the end of the fixed rail 60 and the switchboard door 25 is closed.

At this time, the extension ground wire 33, which is relaxed while the switchboard door 25 is closed, is moved to the ground lead storage room 34 of the ground lead storage container 30 by the elastic energy stored in the spring 50 of the tension mechanism 50. Sag is prevented while being stored.

The present invention as described above is provided with a grounding means for connecting the ground bus and the distribution board installed in the switchgear main body when a short circuit occurs in the switchgear door, the leakage current is grounded through the ground bus provided in the ground means and the main body portion By flowing out, there is an effect of preventing an electric shock caused by a short circuit.

Furthermore, since the present invention is configured to keep the extension ground wire always in tension by the return roller and the tension mechanism, it prevents the extension ground wire from sagging so that the extension ground wire is caught between the distribution board and the switchboard door when the switchgear door is opened and closed. In addition, the extension ground wire can be prevented from coming off from the extension ground wire when the switchboard door is opened and the extension ground wire is in close contact with the outer circumferential surface of the single rail and the leaf rail that are circularly moved to the same center as the door hinge. When the switchboard door is closed, the extension ground wire is automatically stored in the ground bow lead by the tension mechanism and the return roller, so that the interference in the switchboard body can be avoided.

Claims (2)

A ground lead storage room 34 for accommodating the extension grounding wire 33 is formed inside the conductive outer wall 32 vertically formed along the edge of the base plate 31, and an extension grounding wire is formed on the front side of the conductive outer wall 32. An entrance 35 freely enters and exits 33, a roller support plate 36 extending horizontally from the base plate 31 in front of the entrance 35 is formed, and an extension ground line at the bottom of the ground bow storage room 34. A ground bow lead container (30) provided with a ground wire support plate (37) that matches the height of the bottom of (33); In the reinforcing frame 22 welded to the side frame 21 of the switchgear body 20 and welded toward the inner side of the switchgear body 20, the container support 38 for supporting the bottom surface of the ground bow container 30 horizontally; ; Return rollers 40 and 41 in close contact with both sides of the extension ground wire 33 drawn out through the entrance 35 formed in the ground bow lead container 30; Vertically installed at intervals on the upper surface of the roller support plate 36 formed in the ground lead container 30 supports the return rollers 40 and 41 on both sides, and extends the extension ground line 33 to the ground lead chamber 34. A tension mechanism (50) for applying a rotational force to the return rollers (40) and (41) in the receiving direction; A bolt fixing portion 61 fixed to the inner vertical surface of the side plate 23 of the switchboard body 20 is formed at one end, and the other end is curved in an arc shape forming the same center as the rotation center of the door hinge 24. A guide rail 62 is formed horizontally toward the switchboard door 25, and a fixed rail provided with first and second stop pins 63 and 64 at both ends of the inner circumferential surface of the curved guide part 62 ( 60); It is formed by welding two inner plate 71 and the outer plate 72, which is bent in an arc shape, and the "L" shaped to be caught on the upper and lower edges of the fixed rail 60 and the following end plate movable rail 80 The inner departure preventing jaw 73 and the outer departure preventing jaw 74 are formed along the upper and lower ends of the inner plate 71 and the outer plate 72, respectively formed on the fixed rail 60 and the following end plate movable rail 80. The inner catching jaw 75 and the outer catching jaw 76 which reciprocate between the first stop pin 63, the second stop pin 64, the third stop pin 83 and the fourth stop pin 84, respectively, A leaf movable rail (70) formed to protrude downward from one side end of the inner departure prevention jaw (73) and the other end of the outer departure prevention jaw (74); A ground line connecting portion 81 for fixing an end of the extension grounding wire 33 is formed at the other end fixed to the inner side surface of the switchboard door 25, and is fitted to the outer plate 72 of the laminated movable rail 70 to door hinge. A curved slide portion 82 which is circularly moved with the same center of rotation as the center of rotation is formed at one end, and the third stop pin 83 and the fourth stop pin are formed at both ends of the outer circumferential surface of the curved slide portion 82. A single plate movable rail 80 having 84 installed thereon; Ground line guide rollers 90 and 91 installed in the bolt fixing part 61 formed on the fixed rail 60 to guide the extension ground wire 33 passing through the return rollers 40 and 41 to the fixed rail 60. Grounding structure of the switchboard for a multi-family house, characterized in that consisting of. According to claim 1, wherein the tension mechanism 50 is a housing (51) fixed to the upper surface of the roller support plate (36); A spring spring 54 formed inside the housing 51 and having a spring outer hook end 52 which is inserted into and caught in a spring catching groove 53 formed in the housing 51; A housing cover 56 having a sleeve 55 formed in a center thereof and covering the housing 51; A spring coupling part 58 is inserted into the housing 51 through the sleeve 55 formed at the housing cover 56 at the lower end thereof and coupled to the spring center engaging end 57 formed at the center of the spring spring 54. A spindle shaft 59 formed at an upper end thereof and inserted into a center of the return rollers 40 and 41 to be coupled to the return rollers 40 and 41; A locking pin (97) inserted through a pin hole (95) formed in the sleeve (55) and engaged in an annular locking groove (96) formed in the spindle shaft (59) to restrain the axial movement of the spindle shaft (59); Grounding structure of a switchboard for a multi-family house, characterized in that consisting of a bolt fixing flange 98 formed radially on the lower end of the outer surface of the housing (51).

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