National standard of aluminum cable, strict national standard restrictions.

Aluminum cable is a common cable in some circuits. It is a conductor and has a particularly strong conductive function. This kind of cable has undergone special processing and manufacturing technology and adopted advanced scientific manufacturing technology. Compared with previous metal cables, its performance has been improved. For example, it can be greatly bent, and it can be used for a long time whether it is put in water or buried in soil. The most important thing is that its conductivity has been improved. Even if the cable is overheated due to excessive current, it will not have much influence on the conductivity of the cable. The following rabbit introduces its national standard.

At that time, aluminum wire was gradually recognized by shopping malls, and more and more users planned to choose aluminum wire. However, due to the lag of standardization and supervision, it is difficult to tell the difference between good and bad in shopping malls! Many companies that do not have the production skills and equipment of aluminum cables are also promoting aluminum cables on a large scale, which brings great confusion to users' choice. Here are some specifications for users to refer to when choosing manufacturers and commodities, so as to choose truly high-quality aluminum cables. First of all, try to choose a company specializing in the production of aluminum cables. Such companies only focus on the research and manufacture of alloy cables, with more professional technology, more mature production technology and skills, more perfect production equipment and good technology. Only by being professional, dedicated and dedicated can they be better. The following 10 specifications, such as production skills, equipment, skill maturity, professional specifications and experimental statements in aluminum cables, are for the reference of aluminum cable manufacturers:

Investigation specification 1: production, quality and quantity

Aluminum cable is mainly composed of conductor, insulation and armor (sheath). Through the analysis of the basic three elements of aluminum cable, the quality of aluminum cable can be roughly understood.

(1) aluminum alloy conductor bar: See if we can independently produce high-quality aluminum alloy conductor bars.

At present, there are not many domestic manufacturers with independent aluminum alloy conductor production skills, and there are only a handful of aluminum alloy conductor bar production lines that can be continuously melted, continuously cast, continuously cast and continuously rolled. In the absence of independent production capacity of aluminum alloy conductor bars, purchasing aluminum alloy conductor bars through entrusted processing, so-called secret smelting or perhaps other irregular routes can not only ensure the fundamental quality of aluminum cables, but also control the quality of cables from the source. In addition to the aluminum alloy conductor bar production line of melting, continuous casting and continuous casting and rolling, it is also necessary to look at the cross section of the billet continuously cast in the production line. The larger the cross section, the better the quality of rolled aluminum alloy bars, and "good steel will be produced after vicissitudes". Excellent aluminum alloy conductor bar is the decisive factor for the electrical and mechanical properties of aluminum cables. Without high-quality aluminum alloy rod, the fundamental quality of its conductor can not be changed in the subsequent process, no matter how it is drawn, stranded, cabled and armored.

(2) Insulation: There are three views on insulation; Crosslinking degree, stranded conductor, conductor cabling annealing

(1) crosslinking degree; One advantage of aluminum cable over copper cable is that XLPE cable is used for insulation in aluminum cable, and the working temperature of cable is 90 degrees. Because cross-linked polyethylene insulation is selected, the degree of cross-linking is in doubt, and standardized professional aluminum cable manufacturers should have special cross-linking rooms.

(2) Stranded wires; From the perspective of stranded skills and stranded production lines, the professional stranded equipment of cables in China is basically similar at present, and stranded wires usually have aluminium scrap and burr, which will endanger insulation, affect insulation function, form potential safety hazards and shorten insulation life. The most advanced conductor stranding equipment is a nano-technology conductor stranding equipment with separated motor type and PLC program control. Using this advanced process equipment and microcomputer control, the surface of aluminum alloy conductor produced has no aluminium scrap, burr, oil stain, height, scratches and abrasions, which can effectively ensure that the cable insulation is not harmed and damaged, and the service life of the product is much longer than that of similar products.

(3) Conductor annealing: Under normal circumstances, after the conductor is twisted, the internal stress existing in the twisted conductor will be applied to the insulation, which will make the insulation stressed for a long time, accelerate the aging of the insulation, affect the service life of the insulation, and then directly affect the service life of the cable, which is also the reason why the service life of the copper cable is not long. Aluminum alloy factories in the United States all choose the annealing technique of conductor cable to deal with the internal stress problem. Cable-forming annealing skills can further improve the electrical and mechanical functions of goods, eliminate the internal stress in the process of twisting conductors together, and effectively ensure the service life of insulation. So it depends on whether it is equipped with cable annealing skills and conductor cable annealing furnace.

(3) Armoring: See if there is any pre-emptive aluminum alloy interlocking armored equipment.

Many domestic manufacturers' aluminum alloy armor equipment is not good, and the technology is not up to standard, which leads to alloy bandwidth and large armor peak spacing, resulting in stiff cables, insensitive twists and turns, simple armor removal, poor compression resistance and poor function. At present, the most advanced aluminum alloy interlocking armored equipment is Charmac aluminum alloy interlocking armored production line. The interlocking armor produced by this equipment has good sealing performance, interlocking armor and is not easy to fall off. Because the distance between armored peaks is small, armored products with the same distance have more stress points than other armored products, and can bear greater pressure without damaging the cable core. Because there are many peaks, the zigzag radius is smaller, and the zigzag resistance function is very good. This kind of aluminum alloy armor can really meet the requirements of American specifications for aluminum alloy armor.

Investigation Specification 2: Manufacturing Equipment

First, investigate whether the company has pre-emptive aluminum cable manufacturing equipment and skilled equipment.

(1) aluminum alloy conductor bar continuous casting and rolling production line

The key of aluminum cable is the production of aluminum alloy conductor, so when choosing a manufacturer, we should first look at whether there is a pre-emptive continuous casting and rolling production line for aluminum alloy conductor bars. At present, the first aluminum alloy conductor bar production equipment in China is the continuous casting and rolling production line with Italian skills, which can continuously cast large sections (3807mm2, while the largest casting section of other Italian production lines can only reach 2400mm2). After vicissitudes of life, continuous rough rolling with large compression ratio and multi-pass continuous finish rolling, 3807mm2 aluminum alloy bar with moderate strength, high bulk density and the best electrical conductivity and technical index can be obtained. The alloy wire drawn with this aluminum alloy rod is the best product of cable superposition combination. If a factory does not have the first continuous casting and rolling production line for aluminum alloy conductor bars, and the quality of aluminum alloy conductors cannot be controlled from the source of production, the quality of aluminum cables cannot be guaranteed!

(2) Wire Stranding Production Line

At present, stranded conductors produced by conductor stranding production lines of domestic manufacturers usually have aluminium scrap and burrs, which endanger insulation, seriously affect insulation function, form potential safety hazards and shorten insulation life. At present, the most advanced conductor stranding production line in China is a sub-motor-type, PLC-controlled nano-level stranding production line. The surface of aluminum alloy conductor produced by nanotechnology is free of aluminium scrap, burr, oil stain, height, scratches and abrasions, which can effectively ensure that cable insulation is not harmed and damaged, and ensure that the service life of goods is much longer than that of similar goods.

(3) aluminum alloy interlocking armored production line

At present, the most advanced aluminum alloy interlocking armor machine production line in the world is Charmac aluminum alloy interlocking armor machine production line. The aluminum alloy belt interlocking armored cable developed by this production line is based on the American skill specification. The special interlocking structure between layers can ensure that the cable can withstand strong external force damage. Even if the cable is subjected to great external pressure and impact, the armor layer can protect the electrical function of the insulation layer. The structure of non-magnetic aluminum alloy armor layer also effectively improves the flame retardant grade of cable, greatly reduces the fire or the harm of fire to cable, and the non-magnetic aluminum alloy armor also greatly reduces the eddy current loss of cable. Compared with steel belt armored structure, aluminum alloy belt armored structure has the advantages of light weight, no eddy current loss, easy laying, easy twists and turns, and no need for bridge device, which can reduce the installation cost by 20%-30% and improve the power of the device.

Investigation Standard 3: Inspection Report

First of all, investigate whether the company's products have passed all kinds of experiments and tests on product characteristics, fire resistance, flame retardancy, smoke toxicity and light transmittance by national authorities.

(1) Three necessary skill statements: aluminum alloy conductor information check statement, aluminum alloy conductor compression creep function experiment statement, transition terminal 1000 thermal cycle experiment statement. The first is the statement whether the conductor information of aluminum alloy meets the chemical composition requirements of AA8000 brand, the second is the statement that aluminum alloy is directly different from pure aluminum, and the third is the statement of the reliability of the terminal. These three skill statements are necessary for qualified aluminum cables.

(2) Inspection reports of aluminum cables issued by China Wire and Cable Inspection Center, State Grid Wuhan High Voltage Research Institute and other national inspection institutions.

(3) Inspection statement on fire resistance, flame retardancy, smoke toxicity and light transmittance of commodities issued by the National Fire Prevention Building Materials Quality Supervision and Inspection Institute.

(4) When choosing halogen-free and low-smoke goods, special attention should be paid to the inspection statement of smoke toxicity and light transmittance issued by the national quality supervision and inspection of fireproof building materials; At present, many domestic manufacturers claim that the aluminum cables produced are halogen-free and low-smoke, but the materials used in the actual products can not meet the demand of halogen-free and low-smoke, which can be seen from the inspection statement. Provisions on the safety level of tobacco poison inspection in national standards (GB/T20285-2006 smoke toxicity risk classification data); Safety of tobacco poisons: AQ1>; AQ2 & gtza 1 & gt； ZA2 & gtZA3 & gtWX； The light transmittance should be greater than 60%, during this period (AQ: safe level, ZA: quasi-safe level, WX: dangerous level). According to the test results of aluminum alloy products, only the products with smoke index reaching AQ level and light transmittance greater than 60% are truly halogen-free and low-smoke products and truly safe and reliable products. Even if the cable burns, it will not release toxic gas, and the safety of laying, installation and use is high.

(5) As for other so-called assessment statements, professional confirmation, etc. In practice, some companies are playing virtual games. As we all know, these things are issued by some professional departments and intermediaries. As long as you pay, it is not difficult to get them. These statements, confirmations, etc. Nothing can be clarified or confirmed in terms of output, quality and quantity, and it is not enough for reference.

Survey standard 4: Independent intellectual property rights and skill patents

Aluminum cable is a new type of conductor data commodity in China, and there are no special rules and regulations for conductor data of aluminum alloy in the current specification. In order to prevent the source of data and skills from being unknown, and the function and quality of aluminum cable products cannot be guaranteed, it is necessary for the selected manufacturers to have independent intellectual property patent certificates for conductor data and manufacturing skills. It is the basic condition for a company to show its strong technical strength whether it has the patented skills and independent intellectual property rights of central aluminum alloy conductor melting formula and preparation. As we all know, if you don't have the central skills of aluminum wire, it is difficult to guarantee that it is an authentic aluminum cable no matter how glamorous the advertisement is. The formula of aluminum alloy is the first condition of melting, casting blank and rolling rod in the first process of aluminum alloy conductor production. Without the actual formula of aluminum alloy invention patent, the first continuous casting and rolling skill is also a drop in the bucket. The patent formula of aluminum alloy information is the condition for implementing high-level aluminum cable manufacturing and skills, the guarantee of excellent quality in aluminum cables, and the real skill advantage of a company.

Investigation Specification 5: Quality Control

Cable is the artery of power transmission, which is related to the safe and smooth power transmission of a company and even a region. The quality of aluminum wire is very important and can't be careless. There is a great difference between the production skills of aluminum cables and copper cables. The production of aluminum cables requires many professional testing equipment and a perfect quality management system. Each batch of aluminum cables needs strict inspection and inspection in all aspects of production before leaving the factory. An investigation of a manufacturer's mood for quality control can be seen from the personnel, funds and institutions invested. A professional aluminum cable manufacturer should have specialized quality management departments, chemical analysis laboratories, mechanical function laboratories, physical function laboratories, spectral analysis laboratories and electrical function laboratories. Excellent company quality control ranges from training alloy aluminum liquid to continuous casting and rolling; From aluminum alloy bar drawing, compression and torsion to conductor heat treatment; Extrusion crosslinking from conductor insulation to insulated wire core to form cable; Finally, every process from armoring, sheath, routine experiment, packaging to factory has perfect and strict tracking inspection, that is, from the source control, to ensure that the output cable has the highest quality. Quality control is carried out throughout the production of goods, and the nodes are accurate to every minute and second, and corresponding marks are made on the aluminum cable structure to ensure the traceability of every inch of aluminum cable quality control. One of the most important testing equipment is aluminum alloy wire data testing equipment. At present, the most advanced aluminum alloy conductor data detection equipment in the world is the full-spectrum direct-reading plasma emission spectrometer from Germany, which has the fastest detection speed and the highest accuracy. Spectrometer is mainly used to check the chemical composition data of aluminum alloy and the crystallization of the alloy. The quality of aluminum alloy wire can't be guaranteed without the first inspection equipment!

Survey Specification 6: Skill Specification

The national professional standard for aluminum cables has been submitted to the national competent department for approval. If it is drawn up in national standards and is also a company specializing in the production of aluminum cables, it must be the earliest company with strength and influence in the industry. The United States is the birthplace of aluminum cables, and the manufacturing technology and installation experience of aluminum cables in the United States should be more than 40 years ahead of domestic ones. Therefore, objectively speaking, American companies, especially the aluminum cable manufacturers who first introduced aluminum cable skills from the United States and chose American standards for manufacturing, are more secure and reliable.

Survey Specification 7: Customer Cases

Aluminum cable covers residential, commercial and industrial buildings by scale, and the customer's response is of great reference value. It is probably important to know the operation and after-sales guarantee of customers using aluminum cables. If the customer's cable is in doubt every three days, it should be protected by the manufacturer and the cable quality should be emphasized. A quick way to determine the manufacturer of aluminum cable is to investigate the power planning unit. If a power engineering consulting and planning unit chooses aluminum cable for its own construction power transmission, then suppliers and commodities must undergo thorough and close scientific demonstration and can choose.

Survey Specification 8: Value-added Services

Domestic companies usually use the idea of making copper cables to make aluminum cables, and aluminum cables are just one of their commodity series. The idea of operating aluminum cables is also the idea of extending copper cables, simply selling cables. Nowadays, selling aluminum wires with the idea of simply selling cables is no longer in line with the needs of the times and social development. The production of aluminum cables has a high skill threshold. A powerful aluminum cable manufacturer should not only supply the best aluminum cable goods, but also provide a complete set of cable transmission processing scheme and cable connection terminal processing scheme, and assist customers in formulating project skill processing scheme. "Commodity Life Cycle Cost Analysis Table" and other skills and business plans to help customers provide additional value-added services such as cable selection, equipment guidance, personnel training and operation monitoring. Without professional strength, it is difficult for a company to pay attention to the profession of aluminum cable and prepare to serve the mood of aluminum cable users for a long time.

Investigation Specification 9: Field Investigation

Because there are inspection standards for domestic cable products, the samples commonly shown to customers in the professional field are all made by gift companies without exception, and the statements issued by inspection agencies are only for the samples submitted for inspection. If you doubt the supplied goods in practice, it will harm the interests of users. Some unscrupulous manufacturers just use the policy to take the samples of other manufacturers to the relevant inspection institutions for inspection after changing the signs, and show the products of standard chemical plants to customers as their own products, thus deceiving inspection institutions and users. It is also said that they have their own inspection reports and beautiful samples, but the products actually supplied are far from the samples, and even the quality of the products cannot be guaranteed. Therefore, it is best to conduct on-the-spot investigation on the manufacturers to inspect their actual strength, quality and quantity to ensure that the purchased goods are consistent with the samples. If a manufacturer's aluminum cable products can guarantee the same quality and quantity as the random samples, it is guaranteed.

Investigation Specification 10: Brand Civilization

From a company's civilization, business philosophy and brand precipitation, we can also feel a company's feelings about the aluminum cable industry, whether it is empty shouting some "green environmental protection" public relations propaganda slogans, or down-to-earth making goods to provide customers with quality goods and services, which represents different business personalities of different companies and feelings for the aluminum cable industry and users. The former is empty, while the latter is low and pragmatic. Really stand in the customer's point of view for the customer, give priority to the customer's interests, and regard the customer as yourself. Some unscrupulous manufacturers cheat customers for commercial interests, steal the dragon and turn the phoenix around, and harm the interests of customers, such as using aluminum cables as aluminum cables, attacking shopping malls with fake aluminum cables at low prices, pretending to be professional prestige when changing the specifications of aluminum cables and copper cables, and making unscientific statements and practices. These behaviors not only harm the interests of customers, but also leave potential safety hazards for users, which have a negative impact on the occupational health development of aluminum cables. These bad behaviors are exactly what we need to expose and criticize in depth.

With the above 10 specifications, with the first five specifications, it can be judged as a qualified aluminum cable manufacturer. If 10 specifications are available, it is an excellent aluminum cable manufacturer. After the above specification of 10, we can make an accurate judgment on how to choose an excellent aluminum wire manufacturer. The vast majority of poor and unprofessional manufacturers who do not have the production skills and equipment for aluminum cables can simply be swept away. The company and quality selected in this way are probably safer and more reliable!

Aluminum cable adopts aluminum alloy as the conductor of the cable, which greatly improves the conductivity of the cable. Moreover, the aluminum alloy has good quality and is not easy to be corroded, which prolongs the service life of the cable. Because of its many advantages, aluminum cable has been widely used in some large power plants, bureaus and some large industrial plants. The production and use of aluminum cable has seriously impacted the production of traditional cable, and it can be said that it has completely replaced the traditional cable.

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