1. What are the types of commonly used wires and cables categorized by their applications? Answer: They can be categorized into bare conductors, insulated wires, heat-resistant wires, shielded wires, power cables, control cables, communication cables, and radio frequency cables, etc.

What types of insulated wires are there?

Answer: Common types of insulated wires include: polyethylene insulated wire, polyethylene insulated soft wire, nitrile-polyethylene blended insulated soft wire, rubber insulated wire, agricultural underground direct-buried aluminum-core plastic insulated wire, rubber insulated cotton yarn textile soft wire, polyethylene insulated nylon sheathed wire, and polyethylene insulated soft wire for power and lighting.

What occasions are cable trays suitable for?

Answer: Cable trays are suitable for overhead installation of power and control cables in both indoor and outdoor environments in industrial and mining enterprises. They can also be used for telecommunication, broadcasting, and television installations that require overhead mounting indoors and outdoors.

4. What are the accessories for cables?

Answer: Common cable accessories include cable terminal junction boxes, cable intermediate junction boxes, connecting pipes and terminal connectors, steel plate terminal slots, cable bridges, etc.

What is a cable middle joint?

Answer: A cable intermediate joint is a device that connects cables by joining their conductors, insulation屏蔽层, and sheath layers to ensure the cable circuit is connected.

What is the main electrical wiring?

Answer: The main electrical connection is the method of connecting the primary electrical equipment and busbars in power plants and sub-stations, including the connections of the main busbars and the power supply system for the plant, as required by specific functions.

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

Answer: The selection of power cables should adhere to the following criteria: (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 should be equal to or greater than the continuous current of the power supply load; (3) The cross-sectional area of the cores should meet the stability requirements during the short-circuit of the power supply system; (4) Verify the voltage drop in accordance with the cable length to ensure it meets the requirements; (5) The minimum short-circuit current at the end of the line should enable the protective equipment to operate reliably.

8. What are the benefits of comparing cross-linked polyethylene cables and oil-paper cables?

(1) Easy equipment due to its small minimum bending radius and light weight; (2) Not restricted by line drop; (3) Good thermal performance, allowing high operating temperatures and large transmission capacity; (4) Cable accessories are simple and all are dry-type structures; (5) Easy operation and maintenance with no oil leakage issues; (6) Competitive pricing; (7) High reliability and low failure rate; (8) Fewer manufacturing processes, simple technology, and significant economic benefits.

9. What are the requirements for the clips used to secure solid-core cables? Why?

Answer: Jigs should not be made of ferromagnetic materials to form a closed magnetic circuit. This is because when the cable core carries current, magnetic lines of force are generated around it, which are directly proportional to the magnitude of the current passing through the core. If ferromagnetic materials such as iron are used, according to electromagnetic induction, eddy currents will be induced in the ferromagnetic materials, causing the cable to heat up and potentially burn. Therefore, iron should not be used as a fixing clamp for single-core AC cables.

10. What are the features and benefits of the following heat shrink cable head accessories? Answer: The features of the heat shrink accessories are to replace the traditional stress cone with a stress tube, which not only simplifies the construction process but also reduces the standard size of the joint termination, making the equipment convenient, time and labor-saving, and has superior performance and metal-saving. The heat shrink cable accessories integrate the injection and dry packing methods into one, combining the benefits of both types of accessories!

Recycling companies specializing in old cable procurement offer long-term premium services for all types of old cable recycling. Old cables are typically composed of several wires or groups of wires (each group containing at least two wires) twisted around a central core, resembling rope in shape, and covered with a thick insulating layer on the outside.

One. Waste Cable Recycling Brand:

We offer long-term, high-price recycling services for domestic and imported waste cables from brands such as Baosheng, Runle泰山, Yuandong, Shangshang, Panda,亨通光电, Nanyue, Prewitt, Wujiang, Kaiman, Hongqi, Xintie, Nanding, Bendakang, Zhongtian, Taiyang, Kunlun, Jincheng, Ge Pai, Sheng Pai, Taihang, Yudaoyun, Tongbao, Changjiang, Wuxi Changcheng, Jiangsu Taiyang, Wenzhengwang Pai, Jiangsu Dayu, Zhejiang Huatai, Jiangsu Yafei, Jiangxi Shengta, Shanghai Qifan, Lanzhou Zhongbang, Shanghai Youjiang, Qingdao Hongri, Tianjin Jinshan, Kunshan Changjiang, Wuxi Huzhong, Guangzhou Tianhong, Shanghai Shenghua, Jiaxing Duojiao, and more.

Section II: Cable Recycling Regions:

Our company serves the following regions: Hangzhou, Ningbo, Wenzhou, Jiaxing, Huzhou, Shaoxing, Jinhua, Quzhou, Zhoushan, Taizhou, Lishui, Tonglu, Chunan, Jiande, Fuyang, Lin'an, Xiangshan, Ninghai, Yuyao, Cixi, Fenghua, Ruian, Leqing, Jiashan, Haian, Haining, Pinghu, Tongxiang, Zhuji, Shangyu, Shengzhou, Lanxi, Yiwu, Dongyang, Yongkang, Jiangshan, Wending, Lintao) Shanghai area (Pudong New Area, Xuhui District, Changning District, Putuo District, Zhabei District, Hongkou District, Yangpu District, Huangpu District, Luwan District, Jing'an District, Baoshan District, Minhang District, Jiading District, Chongming County), Nanjing, Zhenjiang, Changzhou, Wuxi, Suzhou, Yangzhou, Taizhou, Yancheng, Huai'an, Lianyungang, Nantong, Taicang, Kunshan, Yixing, Jiangyin, Qidong, Haimen, Zhangjiagang, Hefei, Wuhu, Bengbu, Fuyang, Huainan, Huaibei, Tongling, Wuhu, Anqing, Ma'anshan, Jiuhua Mountain, Huangshan, Xuancheng.

Local pick-up for recycling various types of used cables and electrical wires.

Section 3: Waste Cable Recycling Product Introduction

Definition 1: A conductor or a set of conductors insulated from each other and enclosed in an insulating protective layer, used to transmit electricity or information from one place to another.

Definition 2: A cable resembling a rope, typically composed of several strands or groups of wires (each group containing at least two wires), where the wires in each group are insulated from one another and usually twisted around a central core. The entire cable is covered with a highly insulated sheath. The cable features internal conductivity and external insulation.

1. SYV: Solid Insulated Radio Frequency Coaxial Cable

2. Physical Foamed Polyethylene Insulated Cable for CATV System, Video (Radio Frequency) Coaxial Cable (SYV, SYWV, SYFV) for Closed-Circuit Monitoring and Cable Television Engineering

SYWV(Y), SYKV coaxial cable structure for cable TV and broadband internet: single oxygen-free round copper wire + physical foam poly (insulation) + tin wire + aluminum + poly (polyester)

3. Signal control cables (RVV jacketed wire, RVVP shielded wire) are suitable for projects such as intercom systems, anti-theft alarms, fire protection, and automatic meter reading.

RVVP: Copper-core insulated shielded polyethylene sheath flexible cable, voltage 250V/300V, 2-24 cores

　　Application: Instruments, Meters, Intercom, Surveillance, Control Installation

4. RG: Physical Foamed Insulation Cable for Data and Analog Signal Transmission in Coaxial Fiber Hybrid Networks (HFC)

5. KVVP: Shielded braided cable with polyethylene sheath, Applications: Signal transmission, control, and measurement for electrical appliances, instruments, and distribution equipment.

6. RVV (227 IEC52/53): Poly-insulated flexible cable, Applications: Household appliances, small electric tools, instruments, and power lighting

7. AVVR: Soft Cable for Installation of Sheath Protectors

8. SBVV: HYA Data Communication Cables (Indoor and Outdoor) for connecting telecommunication and radio equipment, as well as for wiring distribution boxes in telephone wiring networks.

9. RV, RVP: Poly-insulated cable

10. RVS, RVB: Suitable for cables used in household appliances, small electric tools, instruments, meters, and power lighting connections.

11. BV, BVR: Insulated cables, Application: Suitable for fixed wiring of electrical instruments and equipment, as well as power and lighting installations.

12. RIB: Speaker Connection Cable (High-End Cable)

13. KVV: Insulated Control Cable, Applications: Signal Transmission, Control, and Measurement for Electrical Appliances, Instruments, and Distribution Equipment

14. SFTP: Twisted Pair, for transmitting telephone, data, and information networks

15. UL2464: Computer Cables

16. VGA: Monitor Cable

17. SYV: Coaxial Cable, for transmitting radio frequency signals in wireless communication, broadcasting, surveillance system engineering, and related electronic equipment (including general-purpose coaxial cables)

18. SDFAVP, SDFAVVP, SYFPY: Coaxial Cables, Elevator-Specific

19. JVPV, JVPVP, JVVP: Copper-core insulated and sheathed copper wire, braided electronic computer control cable

Section 4: Waste Cable Recycling Product Classification

Cables include power cables, control cables, compensating cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, and aluminum alloy cables, among others. They are composed of single or multi-strand conductors and insulation, used for connecting circuits and electrical appliances.

Flame-retardant rubber sheathed cable

I. Application

This product is a series of mining rubber sheathed flexible cables. It is suitable for power connections for coal mining machines and similar equipment with rated voltage Uo/U of 1.9/3.3KV or below. Commonly used in coal mines.

Section 2: Terms of Use

The core is permitted to operate at a long-term temperature of 65°C, with the minimum bend radius of the wire being 6 times the diameter of the cable. Yellow sheathed cables should not be exposed to sunlight for extended periods.

Nuclear-grade cable

Application Scope

This product is suitable for control and signal cables used in the control network of nuclear power plants with rated voltage Uo/U of 0.6/1kV.

· The cable conductor allows a long-term working temperature of 90°C, with the cable conductor's temperature not exceeding 250°C during a short circuit, and the duration not to exceed 5 seconds.

The environmental temperature during cable laying should not be below 0°C.

·The allowable bending radius for cable laying is:

Unarmored cables should not be less than 6 times the diameter of the cable.

Cables with armored or copper braid shielding should be at least 12 times the diameter of the cable.

Flexible cables with shielding structures should be at least 6 times the diameter of the cable.

· When the conductor's long-term allowable operating temperature does not exceed 90°C, the cable's certified service life is not less than 40 years.

The finished cables shall meet the requirements of the A-type bundle combustion test as specified in GB/T18380.3 standard.

·Finished cable smoke density: Transparency rate not less than 70%.

Radiation Resistance: 25×10^4 Gy

· Halogen-free: The acidity of the gas emitted during combustion of non-metallic materials (expressed as pH value) should be greater than 4.3; the conductivity should not exceed 10μS/mm.

裸电线 and裸导体制品

This category of products features pure conductive metal, without any insulating or sheath layers, such as steel-core aluminum stranded wire, copper-aluminum busbars, and electric locomotive wires, etc.; the main processing technology is pressure processing, including melting, rolling, drawing, and twisting/compacted twisting, etc.; the products are primarily used in urban and rural areas, user main lines, switchgears, and more.

Electrical Cable

The product is mainly used for the transmission of strong electrical energy in power transmission lines for distribution, transmission, transformation, and supply, with high current flow (ranging from dozens to thousands of amperes) and high voltage (up to 500kV and above).

Communication cables and optical fibers

Over the past two decades, the rapid development of the telecommunications industry has spurred astonishing growth in our products. We've evolved from simple telephone and telegraph cables to thousands of pairs of cables, including coaxial, fiber optic, and data cables, even to composite communication cables. These products typically have smaller and uniform structural dimensions, with high manufacturing precision requirements.

Electromagnetic Wire (Winding Wire)

Primarily used for various motors, instruments, and meters.

Flexible Fire Resistant Cable

1. Excellent fire resistance; the耐火等级 meets not only the international GB12666.6A class 950℃ for 90 minutes, but also complies with the UK BS6387-1994 requirements of A grade 650℃ for 3 hours, B grade 750℃ for 3 hours, and C grade 950℃ for 3 hours. Additionally, it can withstand water spray and mechanical impact during combustion.

2. Continuous length is long, whether it's a single-core or multi-core cable, the length can meet the power supply requirements. The maximum length can reach 2000 meters.

3. Large cross-section single-core cables can reach up to 1000mm², while multi-core cables can reach up to 240mm².

4. Flexible, cables can be coiled on a drum, with a bending radius of ≥20D, where D is the outer diameter of the cable.

5. Smoke and毒-free during combustion, using inorganic materials for insulation, the "non-combustible" body ensures no harmful gases are emitted upon burning, and there is no secondary pollution, making it an eco-friendly green product.

6. The cable has an excessive cross-sectional capacity, with not only a large cross-sectional flow but also significant overload capability. Typically, the cable surface temperature should not exceed 70℃ according to wiring requirements. If the wiring is not touchable and does not come into contact with flammable building materials, the cable jacket temperature can reach 105℃. During overload, the working temperature of the fire-resistant cable allowed can reach up to 250℃.

7. Corrosion-resistant, organic insulated fire-resistant cables may require sheathing with plastic or iron pipes. Plastic tends to age and become brittle, while iron pipes are prone to rust. Fire-resistant cables, on the other hand, have copper sheathing that does not require pipe sheathing and boasts excellent corrosion resistance.

8. Free from electromagnetic interference, fire-resistant cables are laid in the same vertical shaft as signal and control cables. Under the shielding of the copper sheath, the fire-resistant cables will not interfere with the transmission of information in the signal and control cables.

9. High safety, fire-resistant cables not only provide normal power supply in flames and activate fire extinguishing equipment to reduce fire damage, but also offer exceptional reliability for personal safety. The copper sheath is an excellent conductor, grounding wire, and extends continuously throughout the entire cable length, significantly enhancing the sensitivity and reliability of grounding protection.

10. Long service life, inorganic insulation material, high-temperature resistance, and low aging tendency; its lifespan is several times longer than that of organic insulated cables. Under normal operating conditions, its lifespan can be equivalent to that of the building itself.

11. The transportation and installation of flexible fire-resistant cables include the installation process.

New Product

Derivative/new products of wires and cables are mainly generated due to varying application scenarios and requirements, as well as the need for ease of equipment and cost reduction, which lead to the use of new materials, special materials, alterations in product structure, increased process requirements, or combinations of different product types.

Utilizing various materials such as: flame-retardant cables, low-smoke halogen-free/low-smoke low-halogen cables, termite-proof, rodent-proof cables, oil-resistant/cold-resistant/temperature-resistant cables, etc.

Revamp product structure, such as: fire-resistant cables.

Enhance process requirements such as medical cables.

Combined products such as OPGW

Ease of installation and cost reduction for equipment, such as pre-fabricated branch cables.

V. Model of Recycled Cable Scrap Products

The composition and sequence of wire and cable models are as follows: [1: Category, Application][2: Conductor][3: Insulation][4: Inner Sheath][5: Structural Features][6: Outer Sheath or Derivative]-[7: Usage Characteristics]

1-5 items and item 7 are represented by pinyin letters, high polymer materials are represented by the first letter of their English name, each item can be 1-2 letters; item 6 is 1-3 digits.

Common Codes

Usage Code - Not marked as power cable, K-(control cable), P-(signal cable).

Conductor Material Code - Not marked as copper (can also be marked as CU), L-(aluminum)

Inner sheath code - Q-(lead sheathed), L-(aluminum sheathed), H-(rubber sheathed), V-(poly sheath); the inner sheath is generally not marked.

Outer sheath code - V-(Polyester), Y-(Power cable);

Derivative Code - D-(Non-Drip), P-(Dry Insulation)

Special Product Codes - TH-(Humid Tropical), TA-(Dry Tropical), ZR-(Flame Retardant), NH-(Fireproof), WDZ-(Low Smoke, Halogen-Free, Corporate Standard).

Omitting Principle

The principle of abbreviation in model names: Copper is the main conductor material used in wire and cable products, hence the copper core symbol "T" is abbreviated, except for bare wires and bare conductor products. For categories such as bare wires, bare conductor products, power cables, and electromagnetic wire products, the general category symbol is not indicated. Similarly, for electrical equipment wire and cable products and communication cable products, only the subcategory or series symbol is listed.

Item 7 includes markings for special usage occasions or additional requirements, marked in pinyin letters after the "-" symbol. Sometimes to highlight this item, it is placed at the beginning. Examples include ZR-(Flame Retardant), NH-(Fireproof), WDZ-(Low Smoke and Halogen-Free, Company Standard), TH-(For Humid and Hot Areas), FY-(Termite-Proof, Company Standard), etc.

Section 6: Applications of Recycled Cable Recovery Products

Power System

Electric power systems primarily utilize wire and cable products such as overhead bare conductors, busbars, power cables (plastic insulated cables, oil-paper insulated cables, which are largely replaced by plastic power cables), rubber-sheathed cables, overhead insulated cables, branch cables (replacing some busbars), electromagnetic wires, and electrical equipment cables for power equipment.

Information Transmission

Cables and wires for information transmission systems mainly include local telephone cables, television cables, electronic cables, radio frequency cables, fiber optic cables, data cables, electromagnetic wires, power communication cables, or other composite cables.

Instrumentation system

This section is applicable to nearly all products except for overhead bare wires, primarily including power cables, magnetic wires, data cables, and instrument cables, etc.

Section 7: Common Faults in Recycled Cable Products

Common issues with cable lines include mechanical damage, insulation damage, moisture in insulation, aging and deterioration of insulation, overvoltage, and overheating faults. When these issues arise, the power supply to the faulty cable should be disconnected, locate the fault point, inspect and analyze it, then proceed with repairs and testing. Remove what needs to be cut, and only restore power after the fault is resolved.

The most direct cause of cable failure is the reduction in insulation and subsequent breakdown.

Mainly includes:

a. Overloading operation. Prolonged overloading operation will cause the cable temperature to rise, insulate aging, leading to insulation breakdown and reduced construction quality.

b. Electrical issues include: cable head construction not meeting standards, poor cable head sealing, moisture intrusion into the cable interior, and reduced cable insulation performance; failure to implement protective measures during cable laying, resulting in damage to the protective layer and decreased insulation.

c. In civil engineering, issues include: inadequate drainage in manholes and trenches, leading to long-term water immersion and insulation damage of cables; manholes being too small, resulting in insufficient cable bend radius and long-term external force compression damage. The primary cause is often rough construction by machinery during municipal projects, which can cause cuts or breaks in cables.

d. Corrosion: Long-term chemical corrosion or cable corrosion can lead to the failure of the protective layer and a reduction in insulation.

e. Poor quality of the cable itself or cable head accessories, including poor cable head sealing, insulation glue dissolution, cracking, leading to resonance phenomena at the station. This is due to open circuit faults, causing the line-to-line capacitance and ground capacitance to form a resonance circuit with the excitation inductance of the distribution transformer, thereby激发ing ferromagnetic resonance.

Harm caused by resonance due to open circuit failure

In severe cases, the breakdown resonance can cause the superposition of high-frequency and fundamental frequency resonances, leading to overvoltage amplitudes reaching 2.5 times the phase voltage [P]. This may result in neutral point displacement in the system, overvoltage in windings and conductors, and in extreme cases, insulation flashover, lightning arrester explosion, and damage to electrical equipment. In some instances, the phase sequence of the load transformer may be reversed, and overvoltage may be transmitted to the transformer's low-voltage side, causing harm.

Prevent overvoltage due to open-circuit resonance.