About the number of busbar roots in the low voltage distribution cabinet

Many non-professionals do not know the difference between aluminum and copper bars in the distribution cabinet. Now let Anhui Deren Electric, a manufacturer specializing in the production of power distribution cabinets, tell you: in general, the cost of aluminum bars and copper bars for the same load is ten times that of aluminum bars, (the quality is more than 3 times, and the cost of copper bars is more than 3 times).

On the one hand, the conductivity of copper bar is definitely better than that of aluminum bar, some new switch components, the volume is relatively small, at this time if you use copper bar is easier to solve, on the other hand, depending on the customer's requirements, people must use copper, after all, copper is much superior to aluminum in terms of conductivity. For example, an 800 * 800 * 2200 GGD low-voltage distribution cabinet, the copper busbar is 3 * (60 * 6), the zero ground row is also 60 * 6, the bus line is connected to 400A air open, and the empty open is connected to 4 small circuit breakers of 63, in this case, if you do not use the switch, directly use 400 circuit breakers, vertical row to do 360mm, vertical row through transformer, horizontal row 300mm30*3 is fine for horizontal and vertical shooting under the circuit breaker.

The current carrying capacity is 400 to 450 amps. It is also enough to add the load later. <>

The transformer bus is made by the design institute, and the switch cabinet bus is brought by the switch factory, and the design is unwilling to ask the manufacturer's detailed parameters, and a 120x10 bus is enough, because the transformer does not want its unbalanced current to be greater than 30% of the rated current, otherwise the zero sequence current is too large and will cause the core to heat up. The manufacturer does not consider the transformer in the selection of the center point of the switchgear, but only considers the extreme power supply conditions, so the unbalanced current is considered larger, and the center point bus is also larger. The standard configuration of the low-voltage cabinet should have PE line, which has nothing to do with the capacity of the transformer.

However, most of the design drawings do not use PE lines, and it is enough to have a center line. Wiring according to the design drawings. <>

Hello, the grounding busbar of the distribution cabinet is a very important part of the distribution cabinet, and its standardized installation can ensure the safe operation of electrical equipment. The following are several methods of the distribution cabinet grounding busbar specification:1

Choose the right grounding busbar: The grounding busbar should be made of materials with good conductivity, corrosion resistance, high temperature resistance and wear resistance, such as copper, aluminum, etc. 2.

Installation location: The grounding busbar should be installed at the bottom of the distribution cabinet and should be connected to the metal shell of the distribution cabinet to ensure that the resistance between the grounding busbar and the ground is minimal. 3.

Wiring specification: The wiring of the grounding bus bar should be carried out according to the judgment specification, and the wiring should ensure that the contact area is large, the contact is tight, and the contact surface is clean to ensure the smooth flow of current. 4.

Ground resistance test: After the installation of the grounding busbar is completed, the grounding resistance test should be carried out to ensure that the grounding resistance meets the requirements of the specification. In China, the installation and maintenance of power distribution cabinets need to follow the relevant national standards and specifications, such as GB T low-voltage complete sets of pre-leakage closing equipment and control equipment.

Hello! The specifications of the grounding busbar of the distribution cabinet mainly include the following aspects: 1

Grounding busbar material: Copper grounding busbar should be used, and the specifications should meet the design requirements of lead deficiency. 2.

The size of the grounding busbar: The cross-sectional area of the grounding busbar should be calculated according to the electrical load of the distribution cabinet, the rated current of the electric shortage mountain force system and the cross-sectional area of the cable, and determine the reasonable size. Generally speaking, the width of the grounding busbar should not be less than 20mm, and the thickness should not be less than the installation position of the grounding busbar

The grounding busbar should be installed inside the distribution cabinet and connected to the grounding body of other electrical equipment to ensure that each grounding body is at the same potential. The installation position of the grounding busbar should be as close as possible to the position where the power cable enters the box, and the center of the bus should be in order to facilitate grounding. 4.

Wiring of the grounding busbar: The wiring of the grounding busbar should be made of copper terminals, which should ensure that the wiring is firm and the electrical connection is reliable. Fasteners should be used for the connection between the grounding busbar and other grounding bodies to ensure that the fastening torque meets the requirements of the specification.

Signage should be clear and easy to identify.

Summary. The specification of the grounding busbar of the pro-distribution cabinet usually includes the following aspects:1

Selection of busbar: copper busbar or aluminum busbar with good conductivity and corrosion resistance should be selected. 2.

Cross-sectional size of busbar: The appropriate cross-sectional size of busbar should be selected according to the requirements of grounding current and grounding resistance. 3.

The length of the busbar: the length of the busbar should be shortened as much as possible to reduce the influence of the resistance on the grounding current. 4.

Layout of busbar: Busbar should be reasonably arranged according to site conditions and electrical connection requirements of the equipment. 5.

Connection of busbar: The connection between busbars should be fastened with joints and grounding screws to ensure good connection. 6.

Connection between busbar and equipment: The connection between busbar and equipment should also be fastened with joints and grounding screws to ensure reliable grounding of the equipment. 7.

Grounding resistance test: After the busbar is installed, the grounding resistance test should be carried out to ensure that the grounding resistance meets the requirements. In short, the specification of the grounding busbar of the distribution cabinet should be formulated according to the national standards and the actual situation of the site to ensure that the grounding resistance meets the requirements and ensure the safe operation of the equipment.

Work to protect your own safety.

**Okay, too.

PDF files or materials are also acceptable.

The specification of the grounding busbar of the pro-distribution cabinet usually includes the following aspects:1Selection of busbar:

Copper or aluminum busbars with good conductivity and corrosion resistance should be selected. 2.The cross-sectional dimensions of the busbar are bright:

According to the requirements of grounding current and grounding resistance, the appropriate busbar cross-sectional size should be selected. 3.The length of the busbar:

The length of the busbar should be shortened as much as possible to reduce the influence of the resistor on the grounding current. 4.Layout of the busbar:

According to the site conditions and the electrical connection requirements of the equipment, the busbar should be reasonably arranged. 5.Busbar connection:

The connection between the busbars should be tightened with joints and grounding screws to ensure good connection. 6.Connection between busbar and device:

The connection between the busbar and the equipment should also be tightened with joints and grounding screws to ensure that the grounding of the equipment is reliable. 7.Test of Ground Resistance:

After the busbar is installed, the grounding resistance test should be carried out to ensure that the grounding resistance meets the requirements. In short, the specification of the grounding busbar of the distribution number cabinet should be formulated according to the national standards and the actual situation of the site to ensure that the grounding resistance meets the requirements and ensure the safe operation of the equipment. Work to protect your own safety.

The following are pdf files and information of some common distribution cabinet grounding busbar specifications for your reference:1The national standard "Distribution Cabinet" (the specifications for grounding busbars can be free of charge in the national standard.

2.The specifications for grounding busbars in the China Electric Power Industry Standard "Code for Construction and Acceptance of Electric Power Engineering" (DL T 5037-2002) can be standardized for free. 3.

In the standard operating procedures of some distribution cabinet construction sites, there will also be a detailed introduction to the specifications and requirements for the grounding mother exhaust and submerged ants. You can consult your local construction company or power company to obtain it. Hopefully, this information can help you.

In the installation of low-voltage distribution cabinets, low-voltage busbars are used when installing low-voltage.

Use low-voltage cables when installing low-voltage equipment.

The power distribution cabinet (box) is divided into power distribution cabinet (box) and lighting distribution cabinet (box) and metering cabinet (box), which is the final equipment of the power distribution system. The power distribution cabinet is a general term for the motor control center. The distribution cabinet is used in the occasion where the load is relatively scattered and the circuit is less; The motor control center is used in the occasion of concentrated load and many circuits.

They distribute the electrical energy of a certain circuit of the higher-level power distribution equipment to the nearest load. This level of equipment should protect, monitor and control the load.

Main Switchgear Types:

The low-voltage switchgear has GGD, GCK, GCS, MNS, XLL2 low-voltage distribution box and XGM low-voltage lighting box.

Main differences: GGD is fixed, GCK, GCS, MNS are chest of drawers. The propulsion mechanism of GCK and GCS and MNS cabinet drawers is different;

The main difference between GCS and MNS cabinet is that GCS cabinet can only be used as a single-sided operation cabinet with a cabinet depth of 800mm, while MNS cabinet can be used as a double-sided operation cabinet with a cabinet depth of 1000mm.

Advantages and disadvantages: the withdrawable cabinet (GCK, GCS, MNS) is more space-saving, easy to maintain, and has many outlets, but the cost is expensive;

The fixed cabinet (GGD) has fewer outgoing circuits and occupies a larger area (if the place is small and cannot be fixed, it is recommended to make a chest of drawers).

The cost of low-voltage busbar is low, the cost of installation, operation and maintenance is low, if the conditions permit, (such as the environment is spacious, easy to arrange low-voltage busbar channels, etc.), low-voltage busbar should be used.

Low-voltage cables should be used in places where the cost of low-voltage cables is high, the cost of installation, operation and maintenance is high, and the conditions do not allow the installation of low-voltage busbars (such as narrow, unable to arrange low-voltage busbar channels, etc.).

After the low-voltage distribution cabinet is installed as a whole, the low-voltage busbar is installed, and the low-voltage cable is connected to the low-voltage distribution cabinet after it is installed and debugged.

1. Use the busbar where there is enough space.

2. Use busbar in places with high current.

3. Use the busbar where the wiring is convenient.

4. Use the busbar to make it beautiful and low-cost.

5. In principle, all buses above 100A should be considered, and if they can be used, they should be considered with busbars, and if they cannot be used, they should consider using cables.

6. Only the cable should be considered for the small current below 100A, which is more convenient to make.

Busbars are used in the cabinet. Cables are used in and out of the cabinet body.

There is some truth in what the above people say, and this has to be determined according to the actual situation. Based on the above points, consider the actual space location.

Netizen "jerneyxly" said it more comprehensively.

The main line in the distribution cabinet is used busbar (the copper bar (aluminum busbar) used at the upper end of the knife switch is called the low-voltage busbar), and some air switch busbar inserts should be connected with low-voltage cables, and some low-voltage cabinets with metering should also use low-voltage cables.

The low-voltage bus zero line, that is, the neutral line row, is generally arranged together with the ground wire.

This explanation can be understood???

Low-voltage distribution cabinets generally have one or two power supply lines, and several load lines. In order to facilitate wiring, in the distribution cabinet, the incoming and outgoing wires are connected to the copper (or aluminum) busbar, which is called the "busbar". Three-phase electricity has a three-phase bus.

The neutral line also has a busbar.

Connect multiple electrical cabinets in rows, usually with copper or Lu. The neutral line is then connected to the row separately!

After reading your question, I feel that you don't understand at all, and you are bold and anxious for you. Ask for advice from the teachers around you, what does the word mother mean? You know?

Although your mother gave birth to you, this word is not set for your mother, but for all mothers in the world, and mothers can have many children. The cable is a child. I don't know how to explain it, can you understand?

Hurry, hurry, hurry, death.

A1: If there is a large number of single-phase loads. And the three-phase load imbalance is greater than 15%, there is indeed a large number of single-phase loads, it is necessary to choose the equal section bus, the distribution and substation in the general civil building, the low-voltage bus is of equal cross-section (except for industrial buildings).

The N-line cross-section is larger than the L-line, such as the power supply cable of the stage dimming equipment (the dimming component is a thyristor).

2. According to the provisions of the relevant design codes, the grounding system of the distribution substation in the civil building is TN-S, and then the five-core cable should be selected, and the grounding system of the general outdoor box-type substation is TN-C, and the four-core cable should be selected.

3. The selection of all cables and busbars is based on the form of the grounding system.

The form of the grounding system is explained in the grounding chapter of the electrical design code for civil buildings for details.