Basic knowledge of wire

I. Certification and non-certification lines (standard and non-standard lines)

Certifications for wires include: UL certification, VDE certification, CE certification, ETL certification, 3C certification, etc.

Introduction to the certification of wire, cable and electrical in the world:

Introduction to UL certification

UL stands for English: Underwriters Laboratories Inc. (Underwriters Laboratories Inc.). UL Safety Laboratory is one of the most authoritative private organizations engaged in safety testing and appraisal in the United States and the world. It uses scientific testing methods to study and determine whether various materials, devices, products, equipment, buildings, etc. are harmful to life and property and the degree of harm; to determine, compile and issue corresponding standards and help reduce and prevent life Data on property losses, while conducting fact-finding research business.

UL was founded in 1894. In the initial stage, UL was mainly funded by the fire insurance department to maintain its operations. It was not until 1916 that UL was completely independent. After nearly a hundred years of development, UL has become a world-renowned certification body with a complete set of strict organization management system, standard development and product certification procedures. It is managed by a board of directors composed of representatives from security experts, government officials, consumers, education, public utilities, insurance, and standards departments. The daily work is handled by the president and vice president. UL's business scope covers more than 70 countries and regions, and there are 16,500 kinds of 77,000 product inspection tasks each year. At the same time, there are 480,000 factory inspection tasks every year. There are more than 400 employees, more than 40,000 customers worldwide, and 9 billion products use the UL safety mark. Currently, UL has five laboratories in the United States, headquartered in Northbrook Town, north of Chicago, and has established corresponding laboratories in Taiwan and Hong Kong.

Introduction to VDE certification

VDE is the German national product mark. The VDE Testing Institute and Certification Association is a subsidiary of the German Electrical Engineers Association. It was established in 1920. As an internationally recognized electronic and electrical appliance and its parts safety testing and certification organization, it enjoys a high reputation in Europe and even the world. . At present, the demand for VDE certification from customers all over the world is on the rise. According to current European and international standards, VDE testing institutes and certification associations conduct 18,000 tests annually for approximately 2,200 German customers and approximately 2,700 foreign customers. Today, more than 200,000 products all over the world have VDE safety certification.

The full name of VDE is Prufstelle Testing and Certification Institute, which means the German Electrical Engineers Association. Established in 1920, it is one of the most experienced test certification and inspection agencies in Europe. It is a CE notified body authorized by the European Union and a member of the international CB organization. In Europe and internationally, it has been recognized by the CENELEC European certification system for electrical products, the European harmonized system of CECC electronic component quality assessment, and the worldwide IEC electrical products and electronic component certification system. The products evaluated are very extensive, including household and commercial appliances, IT equipment, industrial and medical technology equipment, assembly materials and electronic components, wires and cables, etc.

VDE certification testing agency is located in Offenbach, Germany. The VDE testing/certification agency is affiliated to the German Association of Electrical Engineers (VDE Verband Deutscher Elektrotechnikere.v. for short VDE) and was established in 1920. As a neutral and independent organization, VDE laboratories inspect and certify electrical products in accordance with German VDE national standards or European EN standards, or IEC International Electrotechnical Commission standards, based on applications. It is the most experienced in Europe and enjoys a lot of experience in the world. One of the high reputation certification agencies. It includes the VDE testing and certification system. The VDE mark is a very well-known verification mark in the field of electrical equipment, especially for electrical components (such as circuit breakers, electromagnetic switches, wires/cables, plugs, etc.), and it is commonly applied by many manufacturers to represent quality. At present, the VDE certification mark is also a certification mark that many manufacturers intend to apply for in China. It completes a total of 18,000 certification projects for nearly 2,200 German companies and 2,700 clients in other countries each year. So far, 200,000 electrical products in nearly 50 countries around the world have obtained the VDE mark. In many countries, the VDE certification mark is even more famous than the domestic certification mark, especially recognized and valued by importers and exporters. In our country, the diversification of the export direction of electrical products has caused importers from Europe, Australia, Southeast Asia and other regions to put forward safety certifications such as GS (Germany), BEAB (English), IMQ (Italian) and CE marking requirements. In the certification process, most OEMs break these requirements into parts and require their respective electrical safety parts suppliers to ensure that they obtain a high-level safety certification mark. This is also an increasing number of parts production The reason why companies want to obtain the VDE mark is promoted.

Introduction to CE certification

CE is the abbreviation of European Community Market Standard (CONFORMITE EUROPEENNE). In recent years, in the products sold in the European Economic Area market, the use of the CE mark has increased. Appropriate use of the CE mark has become one of the key factors for products to enter the EU market. Products with the CE mark indicate their Meet the requirements expressed by a series of European directives such as safety, health, environmental protection and consumer protection.

Comply with the key factors required by CE.

1. The manufacturer's DOC (Declaration of conformity) document, which must be submitted before the product enters the European Union. It is the manufacturer's declaration that the product has complied with all relevant EU directives.

2. Technical File (TF), which is used to support DOC files. In the Low Voltage Directive (LVD), it must include drawings, test reports and instructions on how the manufacturer meets the requirements of the directive, and independent third-party testing organizations such as ITS provide test reports to help form this document. Each instruction clearly states where and how long the documents should be archived. In case the manufacturer or importer provides this document to the government agency when needed.

3. Notified Body The independent testing body that is recognized by the corresponding national agency and notified to the European Commission is called the nominated testing body. Certain directives require the participation of the nominated testing body.

4. CE Mark The CE mark must be affixed on every product sold in the European Union, indicating that the supplier promises that the product has met the requirements of all relevant EU directives.

5. Follow-up inspection In contrast to certain directives such as the Medical Devices Directive (Medical Devices Directive), follow-up inspections by nominated testing institutions will be required.

CE: (European Communities) The European Commission's CE mark is a market entry certificate for products sold in the EU.

a. The CE mark indicates to the customs of the importing country that the product complies with the relevant EU directives and the EU also strives to make the trade between member states smoother.

b. The CE mark allows products to legally enter the following eighteen countries' markets: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Liechtenstein, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden , United Kingdom.

c. The CE mark indicates the responsibility of the product manufacturer or importer. The manufacturer or importer declares that their products comply with relevant EU directives. The CE mark is not issued by a certification body.

d. Other certifications issued by third-party organizations can be used together with the CE mark, but they cannot replace the CE mark.

e. The CE mark can be directly marked on the product, or it can be marked with CE on the product user manual or package.

Introduction to ETL certification

ETL is a safety certification recognized in North America. Affixed with C ETL US can be recognized by the North American (U.S. and Canada) market, using UL and CSA standards! (CSA is the Canadian Standards Association. The electronic and electrical products sold in the North American market need to obtain safety certification.) Compared with UL, it has advantages in price, service and cycle time! However, the degree of recognition is slightly lower than UL;
If the company’s products are exported to North America, the products generally need to apply for local certification. In China, it is commonly UL certification. In fact, there are voluntary safety certifications such as ETL, CSA, and MET.
/>When products are exported to the United States, consumers do not understand UL, ETL, CSA, MET certification, but the United States has strict regulations, so some products must be insured by publicly recognized insurance companies. When a person is injured, you can settle claims. The prerequisite for insurance companies to underwrite products is to recognize that organizations such as UL, ETL, CSA, and MET issue certifications and reports. Therefore, UL certification is voluntary certification, but it is also mandatory in disguise.
UL ETL MET is three equivalent institutions. Only one of them is required. However, UL has the highest recognition, so the cost is the highest, and the others are the same.

3C certification

The full name of 3C certification is "Compulsory Product Certification System". It is a product conformity assessment system implemented by governments in various countries to protect consumers' personal safety and national security, strengthen product quality management, and implement laws and regulations. The so-called 3C certification is China's compulsory product certification system, the English name is China Compulsory Certification, and the English abbreviation is CCC.
It is a product conformity assessment system implemented by the Chinese government in accordance with relevant WTO agreements and internationally accepted rules to protect the lives of consumers, animals and plants, protect the environment, and protect national security. The main features are: the state publishes a unified catalog, determines uniformly applicable national standards, technical rules, and implementation procedures, formulates unified logos, and stipulates unified charging standards. All products listed in the compulsory product certification catalogue must be certified by the certification body designated by the state, and only after obtaining relevant certificates and applying certification marks can they leave the factory, import, sell, and use them in business service places.

It should be noted that the 3C mark is not a quality mark, but a basic safety certification.

Products wires and cables subject to compulsory product certification are: wire assemblies, mining rubber-sheathed flexible cables, wires and cables for railway locomotives and rolling stock with AC rated voltages of 3kV and below, and rated voltages of 450/750V and below Rubber insulated wires and cables, PVC insulated wires and cables with rated voltages up to and including 450/750 V

3C certification conditions:

• First there is a license to operate
• The products produced by the second company are in the list of CCC certification compulsory products
• The third company must have its own factory building
• The fourth company must have certain financial strength
• The fifth company has related documents, production environment, warehouse management, etc. The important thing is documents.

Each country has its own national certification body and certification mark. Except UL (United States) and VDE (Germany), there are N (Norway), S (Sweden), FI (Finland), D (Denmark), S+ (Switzerland), PCBC (Poland), BSI (United Kingdom), KEMA (Netherlands), IMQ (Italy), OVE (Hungary), JET (Japan), NF (France), SAA (Australia and New Zealand), GOST-R (Russia), IRAM (Argentina) and China’s CCC (formerly CCEE) . Products that have obtained the certification mark of a certain country need to undergo the supervision and inspection of certification. Generally, a factory inspection at least once a year is required to ensure that the corresponding certified products have the ability to continue quality assurance and product consistency

Two, environmental protection and non-environmental protection:

ROHS certification is environmental certification, this test is mainly for electronic information products, so that they must not contain lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyl ether, polybrominated biphenyl and other toxic and hazardous substances.

On January 27, 2003, the European Parliament and the Council of the European Union passed Directive 2002/95/EC, which is "The Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment." in Electrical and Electronic Equipment), referred to as the RoHS directive. The basic content is: starting from July 1, 2006, the use of lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) will be restricted in the newly launched electrical and electronic equipment products on the market. Six harmful substances. After the release of the RoHS Directive, it became an official law within the EU on February 13, 2003; before August 13, 2004, EU member states converted to national laws/regulations; on February 13, 2005, the European Commission re-examined The directive covers the scope and takes into account the development of new technologies to formulate additional items in the list of prohibited substances; after July 1, 2006, the EU market will officially prohibit the sale of products with six types of substances exceeding the standard.

The following are the upper limits of the six hazardous substances in RoHS:

• Cadmium: less than 100ppm
• Lead: less than 1000ppm (less than 2500ppm in steel alloy, less than 4000ppm in aluminum alloy, less than 40,000ppm in copper alloy)
• Mercury: less than 1000ppm
• Sixvalent chromium: less than 1000ppm
• Polybrominated biphenyls PBB: less than 1000ppm
• Polybrominated biphenyl ether PBD: less than 1000ppm

Environmental protection wire

Environmentally friendly wires refer to wires made of environmentally friendly materials. The materials include insulating materials, conductor materials, and shielding materials. Insulation such as polyvinyl chloride (PVC), radiation cross-linked polyvinyl chloride (XL-PVC), radiation cross-linked polyethylene (XL-PE), low-smoke halogen-free (Halogen-free), silicone rubber, Teflon telflon and so on. The environmental protection of insulating materials is currently mainly based on the EU's RoHS environmental protection directive and EU environmental regulations on children's toys that do not contain 6P (Non-6P), that is, do not contain phthalates. And now the most environmentally friendly is low-smoke and halogen-free, completely free of halogen elements.

Introduction to low-smoke and halogen-free wires:

Refers to rubber materials that do not contain halogens (F, Cl, Br, I, At), lead, cadmium, chromium, mercury and other environmental substances that will not emit toxic fumes (such as hydrogen halide, carbon monoxide, carbon dioxide) when burned Etc.) environmentally friendly wires.

● The halogen pointer is: the value of all halogens≦50PPM (according to regulations PREN 14582)

● The content of hydrogen halide gas produced after combustion <100PPM (according to regulations EN5067-2-1)

● The PH value of the hydrogen halide gas produced after combustion when dissolved in water is ≧4.3 (weakly acidic) (according to the regulations EN-50267-2-2)

● The light transmittance of the product through a beam of light after burning in a closed container is ≧60% (according to the regulations EN-50268-2)

● Pb<90PPM, Cd, Cr6+, Hg, PBBs, PBDEs are all less than 5PPM

Development trend of low-smoke and halogen-free wires

A: Traditional PVC wires and wires will produce smoke containing hydrogen halide, carbon monoxide, carbon dioxide and other toxic gases when burned, which not only affects the smooth progress of disaster relief work, but also causes a "second disaster" to life and property; /p>

B: Switzerland, Germany, Sweden, the United States, Japan and some other countries hold the strongest opposition to the application of PVC. The legislative bodies and coordinating agencies of these countries have enacted strict laws to restrict and eventually cancel Industrial applications of PVC;

C: According to SS-00259, Japan’s SONY company began to require suppliers to provide wires to meet the full low-smoke and halogen-free requirements (except for high-temperature wires such as FEP) in 2005.1.1. Due to the current low-smoke and halogen-free plug glue And the connector part has not been developed yet, and the implementation time has been pushed to 2005.5.1. Phillips will fully replace it from 2006.1. There is no express provision in other countries.

Characteristics of low-smoke halogen-free wire:

(1) The tensile strength is greater than that of ordinary PVC wires: the tensile strength of general PVC wires is greater than 1.05Kgf/mm2, and the tensile strength of low-smoke halogen-free wires is greater than 1.2Kgf/mm2;

(2) Good weather resistance (-30℃~105℃);

(3) Good softness (hardness 80-90);

(4) It is non-migrating (because no plasticizer is added in the formula of this product, there will be no migration);

(5) No toxic black smoke will be produced during combustion (a small amount of white smoke will be produced);

(6) High volume resistivity: PVC wire is generally 1012~1015Ω/cm3, and low-smoke halogen-free wire is greater than 1016Ω/cm3;

(7) It has good high-voltage resistance characteristics: PVC wires generally withstand more than 10KV, while low-smoke and halogen-free wires are as high as 15KV;

(8) It has good elasticity and viscosity.

Additional materials for low-smoke and halogen-free wire rod formula:

(1) Select linear PE and elastic PE as the main resin, and use three kinds of metal oxides containing crystal water as flame retardant materials: they lose crystal water above 200℃, 300℃, and 300℃. No 6P (Non-6P), that is, no phthalates

New EU regulations, DEHP (dihexyl phthalate), DBP (dibutyl phthalate) and BBP (phenylbutyl phthalate) will be restricted to all children’s toys and clothing and Used in PVC materials used in other articles; the corresponding DINP (diisononyl phthalate), DID P (diisodecyl phthalate) and DNOP (dioctyl phthalate) are also limited to Children’s toys and clothing and all items that may be put in the mouth; the content of the above 6 ingredients (6P) shall not exceed 0.1%, and the content of more than 0.1% shall not be sold on the EU market.

Comparison between environmental protection wire and traditional PVC wire:

Traditional PVC wire	Environmental protection wire
Easy to age and cause fire hazards	Using environmentally friendly new materials, processed by high-tech irradiation (high-energy electronics renamed). Long service life (more than 50 years)
The flame-retardant properties are general, and a large amount of black HCL (hydrogen chloride) toxic smoke is released when burned. 95% of the misfortunes in the fire are caused by it.	Good flame-retardant properties, and emit a small amount of water vapor-like light-transmitting white smoke during forced combustion, which does not affect survival and rescue
Slow release of carcinogen plasticizer during use, commonly known as "health killer"	The use of environmentally friendly materials, no need to add any non-environmentally friendly substances, high-tech manufacturing, no environmental concerns
There are a large number of phthalate esters added to PVC, which affects the health of children. It has been banned in Europe	No need to add such substances, no health hazards
Low temperature resistance, normal 90℃, melts at high temperature	High temperature resistance, normal 125℃, high temperature 300℃ does not melt
It is easy to overload and short circuit and catch fire. Once short circuit, it will melt immediately	Long-term current-carrying capacity is 50% higher than that of PVC electric wires, especially strong load capacity
Incomplete incineration or burial of discarded wires, causing environmental pollution	Does not affect the environment
Not resistant to migration, causing damage to electrical equipment	Good migration resistance, use electrical equipment with peace of mind

WEEE is a directive on waste electrical and electronic equipment.

The European Union has fully implemented the "Waste Electrical and Electronic Equipment Directive" (WEEE) since August 2005. This law, which took effect as early as 2003, stipulates that manufacturers (including importers and distributors) must bear the responsibility of paying for the recycling of their scrap products in a legal sense. With the in-depth implementation of the EU RoHS and WEEE directives, domestic and foreign importers and distributors will have more and more urgent requirements for the specific implementation of the WEEE directive.

Three. Classification and composition of wires

Wires and cables are wire products used to transmit electrical (magnetic) energy, information and realize the conversion of electromagnetic energy. Wires and cables in a broad sense are also referred to as cables. A narrow cable refers to an insulated cable. It can be defined as: a collection consisting of the following parts: one or more insulated cores, and their respective possible coating layers, total protective layer and outer protective layer. The cable may also have additional conductors without insulation.　　

1. Bare wires and bare conductor products

The main features of this type of product are: pure conductive metal, no insulation and sheath, such as steel core aluminum stranded wire, copper-aluminum busbar, electric locomotive wire, wire and cable, etc.; the processing technology is mainly pressure processing, Such as smelting, calendering, drawing, stranding / compaction stranding, etc.; products are mainly used in suburbs, rural areas, user main lines, switch cabinets, etc.

2, power cable

The main feature of this type of product is: squeezing (winding) the insulation layer outside the conductor, such as overhead insulated cables, or stranding of several cores (corresponding to the phase, neutral and ground wires of the power system), such as more than two cores Overhead insulated cable, or add a sheath layer, such as plastic/rubber sheathed wire and cable. The main process technologies include drawing, stranding, insulation extrusion (wrapping), cable formation, armoring, sheath extrusion, etc. The different process combinations of various products have certain differences.

The products are mainly used in the transmission of strong electric energy in the power generation, distribution, transmission, transformation, and power supply lines. The current passing through is large (tens of amperes to several thousand amperes) and high voltage (220V to 35kV and above).

3. Wires and cables for electrical equipment

The main features of this type of product are: a wide range of varieties and specifications, a wide range of applications, and the use of more voltages of 1kV and below. In the face of special occasions, new products are continuously derived, such as fire-resistant cables, flame-retardant cables, and low-smoke Halogen/low smoke and low halogen cables, anti-termite cables, anti-mouse cables, oil-resistant/cold-resistant/temperature-resistant/wear-resistant cables, medical/agricultural/mining cables, thin-walled cables, etc.

4. Communication cables and optical fibers

With the rapid development of the communications industry, from the simple telephone and telegraph cables in the past to thousands of pairs of voice cables, coaxial cables, optical cables, data cables, and even combined communication cables.

The structural dimensions of this type of product are usually small and uniform, and the manufacturing precision is high.

5. Magnet wire (winding wire)

Mainly used in various motors, instruments, etc.

6. Derivatives/new products of wires and cables

Derivatives/new products of wires and cables are mainly due to the different application occasions, application requirements, convenience of equipment and requirements for reducing equipment costs, etc., and the use of new materials, special materials, or changing product structures, or improving process requirements, Or combine different types of products.

Use different materials such as flame-retardant cables, low-smoke zero-halogen/low-smoke low-halogen cables, termite-proof, mouse-proof cables, oil/cold/temperature-resistant cables, etc.;

Change the product structure, such as: fire-resistant cables, etc.;

Improve process requirements such as: medical cables, etc.;

Combined products such as OPGW, etc.;

Easy to install and reduce equipment costs, such as prefabricated branch cables.

Fourth, the description of the wire.

Naming principles and cases:

The complete naming of wires and cables is usually more complicated, so people sometimes use a simple name (usually the name of a category) combined with model specifications to replace the complete name, such as "low voltage cable" representing all plastics of 0.6/1kV Insulated power cable. The type spectrum of wire and cable is relatively complete. It can be said that as long as the standard model specification of wire and cable is written, the specific product can be clarified, but what is its complete naming? The naming of wire and cable products has the following principles:

1. The content included in the product name, (1) product application or size category name, (2) product structure material or type, (3) product’s important or additional features, are basically named in the above order, sometimes In order to emphasize important or additional features, write the features before or before the corresponding structural description.

Sequence of structure description

2. The product structure description is based on the principle from the inside to the outside: conductor --> insulation --> inner sheath --> outer sheath --> armor type.

3. Simplify. In the case of no confusion, some structural descriptions are omitted or abbreviated. For example, aluminum conductors are not allowed in automobile wires and flexible wires, so the conductor materials are not described.

Example:

• Rated voltage 8.7/15kV flame-retardant copper core XLPE insulated steel tape armored PVC sheathed power cable
• "Rated voltage 8.7/15kV"-use occasion/voltage level
• "Flame Retardant"-an emphasized feature
• "Copper Core"-Conductor Material
• "Cross-linked polyethylene insulation"-insulation material
• "Steel tape armor"-armor layer material and type (double steel tape gap wrapping)
• "Polyvinyl chloride sheath"-inner and outer sheath materials (the inner and outer sheath materials are the same, the inner sheath material is omitted)
• "Power cable"-the product category name
• The corresponding model is written as ZR-YJV22-8.7/15, and the model is written in the following description

The distinction between wires and cables

There is no strict boundary between "wire" and "cable". Generally, products with a small number of cores, small product diameters, and simple structures are called wires, those without insulation are called bare wires, and the others are called cables. The conductor with a larger cross-sectional area (greater than 6 square millimeters) is called a large wire, the smaller (less than or equal to 6 square millimeters) is called a small wire, and the insulated wire is also called a cloth wire.

The model composition and sequence of wires and cables are as follows:

• [1: category, purpose]
• [2: Conductor]
• [3:Insulation]
• [4:Inner Sheath]
• [5: Structural Features]
• [6: Outer sheath or derivative]
• [7: Make Manganese 卣]

Items 1-5 and 7 are represented by pinyin letters, and polymer materials are represented by the first letter of the English name, and each item can be 1-2.

Letter, the sixth item is 1-3 numbers.

The principle of omission in the model number, copper is the main conductor material used in wire and cable products, so the copper core code T is omitted, except for bare wires and bare conductor products. Bare wires and bare conductor products, power cables, electromagnetic wire products do not indicate the major category code, and the electrical equipment wires and cables and communication cables are also not listed Clear, but list the subclass or series code, etc.

Item 7 is a mark for various special use occasions or additional special use requirements, marked with a pinyin letter after "-". Sometimes in order to highlight this item, write this item to the top. Such as ZR- (flame retardant), NH- (fire-resistant), WDZ- (low smoke and halogen-free, corporate standard), -TH (for hot and humid areas), FY- (termite-proof, corporate standard), etc.

Power cable armor and outer sheath numbers, the numbers mark the armor layer outer layer or outer sheath, 0 none---, 1 interlocking armored fiber outer jacket 2 double-layer steel tape PVC jacket, 3 thin round steel wire polyethylene jacket, 4 thick round steel wire ---, 5 corrugated (embossed) steel strip ---, 6 double aluminum (or aluminum alloy) belt ---, 7 copper wire braided ---, 8 Steel wire braiding

Representative meaning of wire and cable model specifications

Model meaning

R: Flexible cable for connection, wire and flexible structure.

VInsulate PVC.

VPVC insulation

VPVC sheath

B  flat type  flat å .

Stwisted pair type.

ATin or silver plated.

FHigh temperature resistant

Pwoven shield

P2Copper tape shield

P22Steel tape armored

Y—prefabricated type, generally omitted, or polyolefin sheath

FD—The product category represents the branch cable. The Ministry of Construction standards to be promulgated are denoted by FZ, which are essentially the same

YJ—cross-linked polyethylene insulation

V—Polyvinyl chloride insulation or sheath

ZR—flame retardant type

NH—Refractory type

WDZ—halogen-free low-smoke flame retardant type

WDN—halogen-free low-smoke fire-resistant type

For example: SYV 75-5-1(A, B, C

S: Radio frequency, Y: Polyethylene insulation, V: Polyvinyl chloride sheath, A64 braid B96 braid C128 braid, 7575 ohm, 5 wire diameter is 5MM, 1 represents single Core SYWV 75-5-1 S: ​​Radio frequency Y: Polyethylene insulation W: Physical foaming V: Polyvinyl chloride sheath, 75  75 ohm, 5  cable outer diameter is 5MM, 1  represents single core.

For example: RVVP2*32/0.2 RVV2*1.0 BVR R: flexible wire VV: double-layer sheathed wire P shield 2 2 core multi-stranded wire 32, 32 copper wires per core 0.2, diameter of each copper wire 0.2MM

ZR-RVS2*24/0.12 ZR: Flame-retardant R: Flexible wire S: Twisted pair, 2 2 core multi-strand wire, 24, 24 copper wires per core, 0.12, each copper wire diameter is 0.12MM.

Model, name

RV copper core vinyl chloride insulated connecting cable wire 

AVR tinned copper core polyethylene insulated flat connecting flexible cable wire 

RVB copper core PVC flat connecting wire

RVS copper core PVC stranded connecting wire

RVV copper core PVC insulated PVC sheathed round connecting flexible cable

ARVV tinned copper core PVC insulated PVC sheathed flat connecting flexible cable

RVVB copper core PVC insulated PVC sheathed flat connecting flexible cable

RV105 copper core heat-resistant 105oC PVC insulated PVC insulated flexible connecting cable

AF205AFS250AFP250 silver-plated polychloroethylene fluoride plastic insulation, high temperature resistance, 60oC~250oC connecting flexible wire

The meaning of the specification notation, the specification is expressed by the number of cores, nominal cross section and voltage level.

①Single-core branch cable specification representation, the number of cables in the same loop, 1*nominal section, 0.6/1KV, such as: 4*(1*185)+1*95 0.6/1KV.

②The specification of multi-core stranded branch cable, the number of cables in the same loop, the nominal section, 0.6/1KV, such as: 4**185+1*95 0.6/1KV.

Model	Name	Use
BX (BLX) BXF (BLXF) BXR	Copper (aluminum) core rubber insulated wire Copper (aluminum) core neoprene rubber insulated wire Copper core rubber insulated cord	Applicable to electrical equipment and lighting devices with AC 500V and below or DC 1000V and below
BV (BLV) BVV (BLVV) BVVB (BLVVB) BVR BV-105	Copper (aluminum) core PVC insulated wire Copper (aluminum) core PVC insulated vinyl chloride sheathed round wire Copper (aluminum) core PVC insulated vinyl chloride sheathed flat wire Copper (aluminum) core PVC insulated cord Copper core heat-resistant 105°C PVC insulated flexible cord	Suitable for all kinds of AC and DC electrical devices, electrical meters, instruments, telecommunications equipment, power and lighting circuits for fixed laying
RV RVB RVS RV-105 RXS RX	Copper core PVC insulated flexible cord Copper core PVC insulated parallel cords Copper core PVC insulated stranded flexible cord Copper core heat-resistant 105°C PVC insulated connection flexible wire Copper core rubber insulated cotton yarn braided twisted flexible wire Copper core rubber insulated cotton yarn braided round flexible wire	Suitable for the connection of various AC and DC electrical appliances, electrical instruments, household appliances, small power tools, power and lighting devices
BBX BBLX	Copper core rubber insulated glass wire braided wire Aluminum core rubber insulated glass wire braided wire	Applicable voltages are 500V and 250V respectively, which are used for indoor and outdoor fixed laying or laying through pipes.

The meaning of each letter in the wire and cable model

In the production and use process of various wires and cables, some English letters and numbers are used for convenience. However, if there are not many people in contact with this area, these "professional terms" cannot be understood. Now, let the wire and cable factory explain to you the meaning of these confusing letters. After clarifying these, you will have a certain understanding of the cable industry.

1. The meaning of letters and numbers for the model number

NH——Pass GB12666.6 fire resistance test

ZR——Pass GB12666.5 type bunched combustion test

B——low halogen, last position of the model

YJ——cross-linked polyethylene insulation

V-low halogen flame retardant PVC sheath or lining

S——Halogen-free flame-retardant thermoplastic polyolefin sheath or lining

22——Steel tape armored low halogen flame-retardant PVC outer sheath

24——Steel tape armored halogen-free flame-retardant thermoplastic polyolefin outer sheath.

2. Model combination structure and indicated cable name

NH/ZR-YJV-B XLPE insulated low-halogen, flame-retardant, fire-resistant power cable

NH/ZR-YJV22-B XLPE insulated low-halogen, flame-retardant, fire-resistant steel tape armored power cable

NH-ZR-YJS-C XLPE insulated halogen-free low-smoke, flame-retardant thermoplastic polyolefin liner or sheath, fire-resistant power cable

NH-ZR-YJS24-C cross-linked polyethylene insulation halogen-free low-smoke, flame-retardant thermoplastic polyolefin liner or protective layer

Fire-resistant power cable Code meaning 

K -------Control cable

V -------polyvinyl chloride

P -------Copper wire braided shield

R ------- soft conductor structure

Y -------polyethylene

P2 -------Copper tape shielding

ZR -------flame retardant cable

YJ -------cross-linked polyethylene

Y -------polyethylene

22 -------Steel tape armored

NH ------- Fire-resistant cable control cable

KVV22 PVC insulated PVC sheathed steel tape armored control cable.

KYJVP-ZR XLPE insulated PVC sheathed copper wire braided shielded flame retardant control cable.

KYJVP2-NH XLPE insulated PVC sheathed copper tape shielded fire-resistant control cable.

Main purpose and use characteristics, suitable for control, monitoring circuits and protection circuits with rated voltages of 450/750V and below. The long-term allowable working temperature of XLPE insulated control cables does not exceed 90℃; the long-term allowable working temperature of polyvinyl chloride and polyethylene insulated control cables does not exceed 70℃; the installation environment temperature is not lower than 0℃. The bending radius of copper tape shielded or steel tape armored cable should not be less than 12 times the outer diameter of the cable. The bending radius of other types of cables should not be less than 6 times the outer diameter of the cable.

The meaning of symbols in each model of power cable

T: Copper (generally omitted, not included in the model number)

L: Aluminum V: PVC insulation or sheath

YJ: Cross-linked PVC insulation

22: Steel tape armored

32: Thin steel wire armor

42: Thick steel wire armor