What are the knowledge and skills of operating wires and cables?

Knowledge and skills of operating wires and cables: The simple way is to systematically and comprehensively participate in training and learn a set of tutorials to improve performance and pay attention to good skills and methods.

Wire & Cable Overview:

1 What is wire and cable:

Products for the transmission of electrical energy, information and the conversion of electromagnetic energy.

2 Distinction between wires and cables:

Wire: low rated voltage, relatively simple structure, relatively small specifications Cable: vice versa for wires. There is no clear boundary, and it is generally commonly referred to as .

3 Classification of wires and cables According to the use of three categories:

1) Power wires and cables - the wires and cables used in the power system mainly include overhead bare wires, power cables, wires and cables for electrical equipment for power equipment, etc.

2) Communication wires and cables——— wires and cables used for information transmission systems mainly include local telephone cables, television cables, electronic cables, radio frequency cables, optical fiber cables, data cables, or other composite cables.

3) Magnet wire - used to realize the conversion of electromagnetic energy cable, enameled wire, wire coated wire. There are five categories by category:

1) Bare wire - pure conductor metal, no insulation and sheath layer, such as steel core aluminum stranded wire, electric locomotive wire, etc., grounding flexible wire.

2) Power cable - there is insulation, armor, sheath (less than five cores, complex structure), the product is mainly used in the transmission, distribution, transmission, transformation, power supply line in the strong electric energy transmission, through the current is large (tens of ampere to thousands of amperes), high voltage (220V to 500kV and above).

3) Electrical equipment cables - a wide variety of specifications, a wide range of applications, the use of voltage in 1kV and below, oil-resistant, cold-resistant, temperature-resistant, wear-resistant cables, medical, agricultural mining cables, thin-walled wires, etc. --Our development direction.

4) Communication cables - two-core ** lines to thousands of pairs of telephone cables, coaxial cables, optical cables, data cables, and even combined communication cables. The structural size of this type of product is usually small and uniform, and the manufacturing accuracy is high.

5) Magnet wire - mainly used for various motors, instruments, etc.

First of all, we must understand the cable industry, the production process of the cable, the production process, the applicable occasions of the cable, the quality, etc., and then understand the customer, know what the customer wants, what to pay attention to, what to worry about, and to ensure the quality. I also just started to do the cable industry, and I will communicate more in the future.

Household line BV line.

Mining rubber cables.

Copper wire braided cable for computers.

Pre-branch cables for offices, shopping malls, hospitals.

There are also some power cables for machinery and equipment buried in the ground.

The bare cables that stand in the sky are generally aluminum stranded wires **cheap.

There are flame retardant (ZR) and fire resistant (NH).

Then it is divided into various specifications and various voltage levels. It depends on what you need.

Also familiarize yourself with the various standards. That's pretty much it.

Hello, glad to answer for you. To do a good job in the sales of wires and cables, first you need to understand all aspects of your goods, such as performance, service life, and even shortcomings, so that when you introduce them to customers, you have something to say. Secondly, you need to clear your customer positioning, so that you can attack accurately and quickly find the right sales target.

At the same time, you also need to know your opponents so that you can make comparisons when selling your products to your customers. Smile].

1. What are the types of commonly used wires and cables according to their uses?

Answer: According to the use, it can be divided into bare wires, insulated wires, heat-resistant wires, shielded wires, power cables, control cables, communication cables, radio frequency cables, etc.

2. What are the types of insulated wires?

Answer: There are the following kinds of common insulated wires: PVC insulated wires, PVC insulated wires, nitrile PVC mixture insulated wires, rubber insulated wires, agricultural underground directly buried aluminum core plastic insulated wires, rubber insulated cotton yarn textile wires, PVC insulated nylon sheathed wires, PVC insulated soft wires for electricity and old lighting, etc.

3. What kind of occasions is the cable tray suitable for?

Answer: The cable tray is suitable for indoor and outdoor overhead laying of power cables and control cables in general industrial and mining enterprises, and can also be used for indoor and outdoor erection in telecommunications, radio and television departments.

4. What are the cable accessories?

Answer: Commonly used electrical accessories include cable terminal junction boxes, cable middle junction boxes, connecting pipes and terminals, steel plate wiring slots, cable trays, etc.

5. What is a cable intermediate joint?

Answer: The device that connects the cable with the conductor, insulating shield and protective layer of the cable to connect the cable line is called the cable intermediate joint.

6. What is the electrical main wiring?

Answer: The main electrical wiring is the connection mode of the main electrical equipment and bus bar in the power plant and substation, including the connection mode between the main bus and the power system of the plant according to certain functional requirements.

7. What regulations should be followed when selecting the cross-section of the power cable?

Answer: The selection of power cables should follow the following principles:

1) The rated voltage of the cable should be greater than or equal to the rated voltage of the power supply system at the installation point;

2) The continuous allowable current of the cable shall be equal to or greater than the maximum continuous current of the power supply load;

3) The cross-section of the wire core should meet the requirements of the stability of the power supply system when it is short-circuited;

4) Check whether the voltage drop meets the requirements according to the cable length;

5) The minimum short-circuit current at the end of the line should enable the protective device to operate reliably.

8. What are the advantages of cross-linked polyethylene cable and oil-paper cable?

A: (1) Easy to install, because it allows a small minimum bending radius and light weight;

2) Not subject to line drop;

3) Good thermal performance, high allowable working temperature and large transmission capacity;

4) The cable accessories are simple and all of them are dry structure;

5) Simple operation and maintenance, no oil leakage;

6)**Lower;

7) High reliability scatter and low failure rate;

8) The manufacturing process is less, the process is simple, and the economic benefits are significant.

1. External force invasion: If the wire and cable are laid in a region with particularly strong acid and alkali performance, it will usually lead to the erosion of wires and cables, and the thickness of the protective layer will be eroded by organic chemical corrosion or electrolysis for a long time, resulting in the ineffective thickness of the protective layer and the reduction of the insulation layer, which will also cause cable failure. Therefore, for example, before laying the location of wires and cables, it is necessary to analyze the local soil quality.

2. Natural weather: When installing wires and cables, try to avoid exposure to the scorching sun or suffering from strong winds and rains, because the accumulation of wires and cables over time will cause the embrittlement of the sheath to accelerate and reduce the service life of wires and cables.

3. Appropriate temperature: The external natural environment and pyrogen where the cable is located will also cause the temperature of the cable to be too high and the thermal breakdown of the insulation layer, so that the first fire will occur.

Fourth, overload operation: wires and cables should not be overloaded, this is because of the thermal effect of the current, the amount of load current will inevitably cause the conductor to be hot, in addition to the skin effect of the charge and the eddy current loss of the steel armor, the dielectric loss of the insulation layer will also produce additional heat, and then make the temperature of the cable rise. In long-term overload operation, excessive temperature will accelerate the embrittlement of the insulation, resulting in thermal breakdown of the insulation.

When using wires and cables, to use them safely, you should pay attention to the following points:

1. Use copper wires as much as possible to prevent the use of aluminum wires. Due to the poor conductivity of aluminum wire, it is easy to heat up, loose joints and even fire.

2. The wires cannot be buried directly on the wall, and the casing device on the right track should be used to prevent leakage and fire.

3. During construction, it is necessary to pay attention to preventing holes, digging holes, drilling, hanging ceilings and installing artistic lighting fixtures in concrete slabs.

4. Interior decoration to ensure the safety requirements of natural gas pipelines and equipment, do not change, and keep pipelines privately, so as not to affect the normal operation of fragments.

1. The distance of 2m should be maintained when the mining cable is installed in parallel with the thermal pipeline, and it should be maintained when crossing.

2. The distance to be maintained when the cable is installed parallel or cross with other pipelines.

CCC certification mark.

There must be CCC certification mark on the wire, wire and cable products are national compulsory safety certification products, all manufacturers must obtain the "CCC" certification certified by the China Electrical Products Certification Committee, obtain the "CCC" certification mark, and have the "CCC" certification mark on the certificate or product. The wire is related to the safety of electricity, and the bad wire will affect the safety of our life and property, so we must choose the wire product with the CCC certification mark.

Wire appearance. The appearance of a good wire product should be smooth and round, and the color is uniform, so we should disassemble and check the wire when purchasing to see if the appearance is uniform.

Product Certificate.

The wire product certificate will be the "CCC" certification logo, trademark, model specification, rated voltage, length, inspection, manufacturing date, implementation standard, factory name, factory address, ** and other logos are printed clearly, and in line with the product, these will be the production products of regular manufacturers, we should see clearly when purchasing.

Wire conductors. The conductor of the wire should be shiny, and the DC resistance and conductor structure size should meet the requirements of the national standard. The wire and cable products that meet the requirements of the national standard, whether it is an aluminum conductor or a copper conductor, are relatively bright and oil-free, so the DC resistance of the conductor is fully in line with the national standard, with good conductivity and high safety. How to purchase wires.

Wire specifications. Wire specifications are very important, and generally household power cords should use BVV2 and BVV2 type wires. BVV is the national standard code, which is the copper sheathed wire BVV2 and BVV2, which represent 2 cores square millimeters and 2 cores square millimeters respectively. In general, BVV2 is used as the main line and trunk line, and BVV2 is used as a single electrical branch line and switch line.

BVV2 4 for one-way air-conditioning line, with dedicated ground wire.