CN110137867B - Method for live wiring in low-voltage cable branch box - Google Patents

Abstract

The invention relates to the technical field of electric power meter connection. A method for live wiring in a low-voltage cable branch box is characterized by comprising the following steps: 1) preparing a device for live wiring in a low-voltage cable branch box, comprising a first fastening screw, a device body, a second fastening screw, The third tightening screw; the lower part of the second tightening screw is screwed into the second threaded hole, and the lower part of the third tightening screw is screwed into the third threaded hole; 2) Prepare the low-voltage cable branch box; 3) Will be used for low-voltage The live wiring device in the cable branch box is installed on the copper strip of the low-voltage cable branch box; 4) When a new power line is to be connected, under live conditions, insert the first power line into the hole and the second power line into the hole Insert the light end of the power cord into the device, then use an insulated screwdriver to tighten the first fastening screw and the second fastening screw respectively, and fix the new power cord to be connected on the device body. This method can carry out live wiring work without power outage.

Description

A method for live wiring in a low-voltage cable branch box

technical field

The invention relates to the technical field of electric power meter connection, in particular to a method for live wiring in a low-voltage cable branch box.

Background technique

The structure of the low-voltage cable branch box is shown in Figure 1. The low-voltage cable branch box includes a box door, a first connecting screw, a low-voltage cable branch box box, a copper bar, a fixed horizontal bar, and a third connecting screw; the low-voltage cable branch box inside the box It is a cavity, the left and right sides of the low-voltage cable branch box are hinged with box doors, respectively, and the cavity of the low-voltage cable branch box is horizontally arranged with a plurality of fixed horizontal bars, and the fixed horizontal bars are connected by a third connecting screw. (or bolts) are fixedly connected to the low-voltage cable branch box body. A plurality of copper strips are arranged in the cavity of the low-voltage cable branch box body along the longitudinal intervals. The copper strips are fixed by the first connecting screw (or bolt) and the fixed horizontal strip. Connection; the upper end of the copper strip is provided with two screw holes, a second connecting screw and a gasket are used to connect the power lines, and the two power lines are arranged horizontally. When the new user meter (three-phase low-voltage metering device) needs to be replaced or added, because the current low-voltage cable branch box power outlet is connected by tightening the screws on the copper bar (busbar), the copper bar is connected by extrusion. There is no power disconnection point, and the entire branch needs to be powered off during operation, or even shut down the entire transformer. This method will affect the normal electricity consumption of as few as dozens of households and as many as hundreds of households.

There are the following shortcomings: 1. After the low-voltage cable branch box is powered and put into operation, when the metering device is installed again, it is limited by the small box of the live low-voltage cable molecular box and the limited safety distance between the live copper bars. The entire low-voltage branch line can be safely connected to the new user's electricity meter. The shutdown of the transformer will cause a large-scale power outage, which will seriously affect the power supply. 2. The wiring direction in the daily low-voltage cable branch box is horizontal discharge. Due to the influence of space, the safe distance between the phase sequences cannot be guaranteed, and there are great safety hazards. Clear, neat and beautiful requirements.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for live wiring in a low-voltage cable branch box, which can perform live wiring operations without power failure.

In order to achieve the above purpose, the technical scheme adopted by the present invention is: a method for live wiring in a low-voltage cable branch box, which is characterized by comprising the following steps:

1) Prepare a device 9 for live wiring in a low-voltage cable branch box. The device for live wiring in a low-voltage cable branch box includes a first fastening screw 10, a device body 15, a second fastening screw 16, and a third fastening screw 16. Tighten the screw 22; the left part of the device body 15 is provided with a first power cord insertion hole 11, the left part of the device body 15 is provided with a first threaded hole 12, and the first threaded hole 12 is connected with the first power cord insertion hole 11 The right part of the device body 15 is provided with a second power cord insertion hole 18, the upper right part of the device body 15 is provided with a second threaded hole 17, and the second threaded hole 17 is communicated with the second power cord insertion hole 18; the device The lower left and right ends of the main body 15 are provided with hooks 19 , and a bayonet 20 is formed between the two hooks 19 , and two third threaded holes 21 are provided on the middle of the device body 15 . The third threaded holes 21 and the bayonet 20 The lower part of the first tightening screw 10 is screwed into the first threaded hole 12, the lower part of the second tightening screw 16 is screwed into the second threaded hole 17, and the lower part of the third tightening screw 22 is screwed into the third thread in hole 21;

2) Prepare the low-voltage cable branch box in the uncharged state: the low-voltage cable branch box includes the box door 1, the first connecting screw 2, the low-voltage cable branch box box 3, the copper bar 4, the fixed horizontal bar 5, and the third connecting screw. 14; the low-voltage cable branch box body 3 is a cavity 6, the low-voltage cable branch box body 3 is provided with a wire hole for the power cord to pass through, and the left and right sides of the low-voltage cable branch box body 3 are hinged with The box door 1 and the cavity 6 of the low-voltage cable branch box body 3 are arranged with a plurality of fixed horizontal bars 5 side by side in the horizontal direction. The fixed horizontal bars 5 are fixedly connected with the low-voltage cable branch box body 3 by the third connecting screw. In the cavity 6 of the cable branch box body 3, a plurality of copper bars 4 are arranged at intervals along the longitudinal direction, the copper bars 4 are located above the fixed horizontal bars 5, and the copper bars 4 are fixedly connected with the fixed horizontal bars 5 by the first connecting screw 2; The upper end and the lower end of the copper bar 4 are provided with two screw holes 23;

3) In the non-energized state, install the device 9 for live wiring in the low-voltage cable branch box to the copper bar 4 of the low-voltage cable branch box: The device 9 for live wiring in the low-voltage cable branch box is clamped by the bayonet 20. On the end of the copper bar 4, then tighten the third fastening screw 22, and the third fastening screw 22 is in contact with the copper bar 4; the first power line insertion hole of the device 9 for live wiring in the low-voltage cable branch box 11. The second power cord insertion hole 18 is arranged longitudinally;

4) When a new power cord is to be connected, under live conditions, loosen the first fastening screw 10 and the second fastening screw 16 with an insulated screwdriver; insert the first power cord into the hole 11 and the second power cord Insert the light ends of the power cord 8 into the insertion holes 18 respectively, then use an insulated screwdriver to tighten the first fastening screw 10 and the second fastening screw 16 respectively, and fix the new power cord 8 to be connected to the device body 15 superior.

5) When a new user meter needs to be replaced, under live conditions (with protective measures, that is, use an insulating screwdriver and insulating pliers), loosen the first fastening screw 10 and the second fastening screw 16; 8 from the first power cord insertion hole 11 and the second power cord insertion hole 18 respectively; after the replacement of the new user meter is completed, insert the first power cord insertion hole 11 and the second power cord insertion hole 18 respectively. Insert the light end of the power cord 8, then use an insulated screwdriver to tighten the first fastening screw 10 and the second fastening screw 16 respectively, and fix the power cord 8 to be connected on the device body 15 again.

The lower end of the third fastening screw 22 is screwed into the screw hole of the upper end of the copper strip 4 .

The device body 15 is provided with a groove 13 , and the third threaded hole 21 is located in the groove 13 .

The main purpose of the design of the device used for live wiring in the low-voltage cable branch box is to solve 1. How to install the metering device again without power failure after the low-voltage cable branch box is powered on. This design can obtain power safely and conveniently without shutting down The main transformer avoids the situation of large power failure range and many power failure users; 2. The direction of wiring in the daily low-voltage cable branch box is horizontal discharge. Due to the influence of space, the safe distance between phase sequences cannot be guaranteed, and there is a great safety Hidden danger, the design of the new device designs the line direction as vertical discharge, which solves the problem of line spacing in the branch box, ensures the safety of electricity consumption, and meets the line installation process requirements.

The present invention has the following beneficial effects:

1) Live wiring operations can be performed without power outages, avoiding large-scale power outages and ensuring power supply needs.

2) The device used for live wiring in the low-voltage cable branch box is designed to be arranged vertically and vertically, and the wiring operations are carried out in a top-to-bottom order, which solves the problem of line spacing in the branch box and ensures that the Electrical safety and meet the technical requirements of line installation.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:

FIG. 1 is a schematic structural diagram of an existing low-voltage cable branch box.

FIG. 2 is a schematic structural diagram of the low-voltage cable branch box of the present invention.

FIG. 3 is a schematic structural diagram of a device for live wiring in a low-voltage cable branch box according to the present invention.

FIG. 4 is a top view of FIG. 3 .

In the picture: 1-box door, 2-first connecting screw, 3-low-voltage cable branch box body, 4-copper bar, 5-fixed horizontal bar, 6-cavity, 7-second connecting screw, 8-power supply wire, 9-device for live wiring in low-voltage cable branch box, 10-first fastening screw, 11-first power cord insertion hole, 12-first threaded hole, 13-groove, 14-third connection Screw, 15-device body, 16-second fastening screw, 17-second threaded hole, 18-second power cord insertion hole, 19-hook, 20-bayonet, 21-third threaded hole, 22- Third fastening screw, 23-tap hole.

Detailed ways

As shown in Figure 2-4, a method for live wiring in a low-voltage cable branch box includes the following steps:

1) Prepare a device 9 for live wiring in a low-voltage cable branch box. The device for live wiring in a low-voltage cable branch box includes a first fastening screw 10, a device body 15, a second fastening screw 16, and a third fastening screw 16. Tighten the screw 22; the left part of the device body 15 is provided with a first power cord insertion hole 11 (the left side in FIG. A threaded hole 12 is matched with the first tightening screw 10. In this embodiment, two first threaded holes 12 are used, corresponding to the two first tightening screws 10). The first threaded hole 12 is connected to the first power cord insertion hole 11. The right part of the device body 15 is provided with a second power cord insertion hole 18, and the upper right part of the device body 15 is provided with a second threaded hole 17 (this embodiment uses two second threaded holes 17, the second fastening screw 16 is correspondingly 2), the second threaded hole 17 is communicated with the second power cord insertion hole 18; the lower left and right ends of the device body 15 are provided with hooks 19, and a bayonet 20 is formed between the two hooks 19, the device There are two third threaded holes 21 on the top of the middle of the main body 15 (two third threaded holes 21 are used in this embodiment, and two third tightening screws 22 are correspondingly; more than one can also be used), and the third threaded holes 21 Connected with the bayonet (rectangular slot) 20; the lower part of the first tightening screw 10 is screwed into the first threaded hole 12, the lower part of the second tightening screw 16 is screwed into the second threaded hole 17, and the third tightening The lower part of the screw 22 is screwed into the third threaded hole 21;

2) Prepare the low-voltage cable branch box in the uncharged state: the low-voltage cable branch box includes the box door 1, the first connecting screw 2, the low-voltage cable branch box box 3, the copper bar 4, the fixed horizontal bar 5, and the third connecting screw. 14; The low-voltage cable branch box body 3 is a cavity 6, the low-voltage cable branch box body 3 is provided with a wire hole for the power line to pass through (the wire hole is connected with the cavity 6), and the low-voltage cable branch box body 3 The left and right sides are hinged with box doors 1 (one of the box doors 1 is provided with a lock), and a plurality of (such as 2-6) In this embodiment, two fixed horizontal bars 5 are used; in Figure 2, the left and right directions are horizontal, and the up and down directions are vertical). Fixed connection, the cavity 6 of the low-voltage cable branch box body 3 is arranged with a plurality of (such as 2-10, in this embodiment, 4 are used to form copper bars) copper bars 4, and the copper bars 4 are located in the fixed horizontal direction. Above the bar 5, the copper bar 4 is fixedly connected with the fixed horizontal bar 5 by the first connecting screw (or bolt) 2; the upper end and the lower end of the copper bar 4 are provided with two screw holes 23 (this embodiment uses two The screw hole 23, the prior art uses the second connecting screw 7 and the gasket to connect the power line 8, and the two power lines 8 can only be arranged horizontally. Due to the influence of space, the safe distance between the phase sequences cannot be guaranteed, and there is a lot of Great safety hazard. The present invention can use the screw hole 23 to fix the device 9 for live wiring in the low-voltage cable branch box, and the third tightening screw 22 is screwed into the screw hole. The copper strip 4 is connected to the power supply by an external power input line. connected);

3) In the non-energized state, install the device 9 for live wiring in the low-voltage cable branch box on the copper strip 4 of the low-voltage cable branch box (after the low-voltage cable branch box is installed, before the live wiring): use The device 9 with live wiring in the low-voltage cable branch box is clamped on the end of the copper strip 4 by the bayonet 20, and then the third tightening screw 22 is tightened with an insulating screwdriver (tighten with an insulating screwdriver and an insulating screwdriver), The third tightening screw 22 is in contact with the copper bar 4 (that is, the device 9 used for live wiring in the low-voltage cable branch box can be fixed. Further, the lower end of the third tightening screw 22 is screwed into the screw of the upper end of the copper bar 4 In the hole, it is more solid; multiple new user meters need to be connected, and multiple devices for live wiring in the low-voltage cable branch box are also installed 9); the first power supply for the device 9 for live wiring in the low-voltage cable branch box The wire insertion hole 11 and the second power wire insertion hole 18 are arranged in the longitudinal direction;

4) When a new power cord is to be connected (new user meter), under live conditions (with protective measures, that is, use an insulated screwdriver and insulated pliers), loosen the first tightening screw 10 and the second tightening Screw 16; insert the light end of the power cord 8 into the first power cord insertion hole 11 and the second power cord insertion hole 18, respectively, and then use an insulated screwdriver to tighten the first fastening screw 10 and the second fastening screw respectively 16. Fix the new power cord 8 to be connected on the device body 15 .

5) When a new user meter needs to be replaced, under live conditions (with protective measures, that is, use an insulating screwdriver and insulating pliers), loosen the first fastening screw 10 and the second fastening screw 16; 8 from the first power cord insertion hole 11 and the second power cord insertion hole 18 respectively; after the replacement of the new user meter is completed, insert the first power cord insertion hole 11 and the second power cord insertion hole 18 respectively. Insert the light end of the power cord 8, then use an insulated screwdriver to tighten the first fastening screw 10 and the second fastening screw 16 respectively, and fix the power cord 8 to be connected on the device body 15 again.

The device body 15 is provided with a groove 13 , and the third threaded hole 21 is located in the groove (rectangular groove) 13 . The first fastening screw 10 , the device body (in the form of a rectangular parallelepiped) 15 , the second fastening screw 16 , and the third fastening screw 22 are all conductive materials (made of conductive copper materials).

When the low-voltage cable branch box needs to be wired under live conditions, it is not necessary to stop the transformer in operation. Under protective measures, loosen the first fastening screw 10 and the second fastening screw 16; insert the first power cord into the hole 11 , Insert the light end of the power cord 8 into the second power cord insertion hole 18 respectively, and then tighten the first fastening screw 10 and the second fastening screw 16 respectively, and fix the new power cord 8 to be connected to the device body. 15, the wiring device can be energized. When installing the metering device, it can provide a convenient power point. When the metering device is connected to the fire, it is not necessary to shut down the main transformer, which avoids the situation of large power outages and many users, and improves the operation efficiency. The direction of the lines is designed to be arranged vertically and vertically, and the wiring operations are performed in multiple times in the top-to-bottom order, which solves the problem of the line spacing in the branch box, ensures the safety of electricity consumption, and meets the requirements of the line installation process.

Claims (3)

1. a method for live wiring in a low-voltage cable branch box is characterized in that comprising the steps: 1) Prepare a device (9) for live wiring in a low-voltage cable branch box, the device for live wiring in a low-voltage cable branch box includes a first tightening screw (10), a device body (15), a second tightening screw A fixing screw (16) and a third tightening screw (22); the left part of the device body (15) is provided with a first power cord insertion hole (11), and the upper left part of the device body (15) is provided with a first threaded hole (12), the first threaded hole (12) is communicated with the first power cord insertion hole (11); the right part of the device body (15) is provided with a second power cord insertion hole (18), and the device body (15) is provided with a second power cord insertion hole (18). A second threaded hole (17) is provided on the upper surface of the right part, and the second threaded hole (17) is communicated with the second power cord insertion hole (18); the lower left and right ends of the device body (15) are provided with hooks (19). ), a bayonet (20) is formed between the two hooks (19), and there are two third threaded holes (21) on the top of the middle of the device body (15), the third threaded hole (21) and the bayonet (20) The lower part of the first tightening screw (10) is screwed into the first threaded hole (12), the lower part of the second tightening screw (16) is screwed into the second threaded hole (17), and the third tightening screw The lower part of (22) is screwed into the third threaded hole (21); 2) Prepare the low-voltage cable branch box in the uncharged state: the low-voltage cable branch box includes the box door (1), the first connecting screw (2), the low-voltage cable branch box box (3), the copper strip (4), the fixed The horizontal bar (5) and the third connecting screw (14); the low-voltage cable branch box body (3) is a cavity (6), and the low-voltage cable branch box body (3) is provided with a wire for the power cable to pass through The left and right sides of the low-voltage cable branch box (3) are hinged with box doors (1) respectively, and a plurality of The fixed horizontal bar (5) is fixedly connected with the low-voltage cable branch box body (3) by the third connecting screw, and the cavity (6) of the low-voltage cable branch box body (3) is spaced along the longitudinal direction. A plurality of copper bars (4) are arranged, and the copper bars (4) are fixedly connected with the fixed horizontal bars (5) by the first connecting screw (2); the upper and lower ends of the copper bars (4) are provided with two screws. hole(23); 3) Install the device (9) for live wiring in the low-voltage cable branch box on the copper strip (4) of the low-voltage cable branch box in a non-energized state: the device for live wiring in the low-voltage cable branch box (9) ) is clamped on the end of the copper strip (4) by the bayonet (20), and then the third tightening screw (22) is tightened, and the third tightening screw (22) is in contact with the copper strip (4); for low pressure The first power cord insertion hole (11) and the second power cord insertion hole (18) of the live wiring device (9) in the cable branch box are longitudinally arranged; 4) When a new power cord is to be connected, under live conditions, use an insulated screwdriver to loosen the first fastening screw (10) and the second fastening screw (16); insert the first power cord into the hole (11). ), insert the light end of the power cord (8) into the second power cord insertion hole (18), respectively, and then use an insulated screwdriver to tighten the first fastening screw (10) and the second fastening screw (16) respectively, Fix the new power cord (8) to be connected on the device body (15); 5) When a new user meter needs to be replaced, under live conditions, loosen the first fastening screw (10) and the second fastening screw (16); connect the light ends of the two power cords (8) from the first Pull out the power cord insertion hole (11) and the second power cord insertion hole (18); after the replacement of the new user meter is completed, insert the first power cord insertion hole (11) and the second power cord insertion hole (18) into the holes (18) respectively. the light end of the power cord (8), then use an insulated screwdriver to tighten the first fastening screw (10) and the second fastening screw (16) respectively, and fix the power cord (8) to be connected to the device body again. (15) on. 2. A method for live wiring in a low-voltage cable branch box according to claim 1, wherein the lower end of the third fastening screw (22) is screwed into the screw hole of the upper end of the copper strip (4) middle. 3. A method for live wiring in a low-voltage cable branch box according to claim 1, wherein a groove (13) is provided on the device body (15), and the third threaded hole (21) is located in the concave in the groove (13).

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