I. Product-Specific Information
(1) Specifications and Parameters
The 25mm² and 35mm² 4-core armoured flame-retardant
Power Cables produced by reliable manufacturers have rigorous and clear settings in terms of specifications and parameters to meet the power transmission needs of medium and low-voltage distribution systems.
In terms of conductor specifications, the cable adopts a 4-core structure, with each core conductor having a cross-sectional area of 25mm² and 35mm² respectively. The 4-core design usually includes 3 phase lines and 1 neutral line, which can effectively realize three-phase four-wire power transmission and ensure the balance of power distribution. The single-core conductor of the 25mm² cable is made of multiple
Copper Wires with a diameter of about 0.25mm stranded together, and the total cross-sectional area is accurately controlled at 25mm²; the diameter or number of copper wires in the single-core conductor of the 35mm² cable is increased to meet the 35mm² cross-sectional area standard.
Current-carrying capacity is a key parameter to measure the transmission capacity of the cable. At an ambient temperature of 25℃, the current-carrying capacity of the 25mm² cable is about 85-110A, and that of the 35mm² cable is about 110-140A. This current-carrying capacity range enables it to adapt to electrical equipment of different powers. In medium and low-voltage distribution systems, it can meet the power supply needs of equipment from small and medium-sized motors to large central air conditioners.
In terms of electrical performance, the rated voltage of the cable is 0.6/1kV, which meets the voltage standard of medium and low-voltage distribution systems. The conductivity of the copper conductor is as high as more than 98% IACS, which can minimize energy loss during current transmission and ensure efficient power transmission. The insulation resistance of the PVC insulation layer is not less than 500MΩ·km at 20℃, and it has excellent voltage resistance performance. In the withstand voltage test at 1kV for 1 minute, there is no breakdown or flashover phenomenon, which can effectively prevent current leakage and ensure electrical safety.
The flame-retardant performance parameters are outstanding. The oxygen index of the PVC insulation layer is ≥30, which meets the flame-retardant requirements in GB/T 18380.3-2008 "Burning Tests of Cables and Optical Cables Under Fire Conditions - Part 3: Test Methods for Burning of Bundled Wires and Cables". In the bundle burning test, the flame spread height of the cable does not exceed 2.5m, and after the burning stops, the afterflame and afterglow times are not more than 15 seconds, which can effectively delay the spread speed of the flame and gain time for personnel evacuation and fire fighting.
In terms of mechanical performance, the armoured layer is made of
Steel Tape or steel wire, making the cable have strong resistance to mechanical damage. The tensile strength of the 25mm² cable is not less than 12MPa, and the elongation at break is not less than 150%; the tensile strength of the 35mm² cable is not less than 14MPa, and the elongation at break is not less than 140%. The static bending radius of the cable is not less than 12 times the outer diameter of the cable, and the dynamic bending radius is not less than 20 times the outer diameter of the cable, which can adapt to the bending needs in different laying environments and facilitate construction and installation.
(2) Characteristic Applications
The 25mm² and 35mm² 4-core armoured flame-retardant power cables have characteristic applications in many fields due to their flame-retardant properties, armoured protection and excellent conductivity.
In high-rise buildings, there are dense personnel and many electrical equipment, and the fire risk is relatively high, so the flame retardancy and safety requirements for cables are extremely high. The cable can be used as a distribution trunk line for power transmission from the substation in the building to the distribution room on each floor. The 25mm² cable is suitable for high-rise buildings with small floor areas and can meet the electricity needs of lighting, sockets, etc. in ordinary residential floors; the 35mm² cable is suitable for places with large floor areas and high electrical loads such as large office buildings and hotels, providing stable power for air conditioners, elevators, office equipment, etc. Its flame-retardant performance can delay the spread of fire when a fire occurs, and the armoured layer can resist mechanical collisions during building construction or daily use, ensuring the continuity of power supply.
Shopping malls, hospitals and other densely populated places are also important application scenarios for this cable. There are many electrical equipment such as various shops, lighting and ventilation systems in shopping malls. The 35mm² cable can be used as the main distribution trunk line to ensure stable power transmission; the operating rooms, wards and medical equipment in hospitals have strict requirements on the reliability of power. The 25mm² and 35mm² cables can be used for distribution lines in different areas respectively. Their flame-retardant performance can reduce the impact of fire on the power system and provide guarantee for the normal conduct of medical activities.
In industrial plants, there are situations such as mechanical vibration and heavy object collision, and the armoured layer can provide effective mechanical protection for the cable. The 25mm² cable can be used for distribution lines of small and medium-sized production equipment, and the 35mm² cable is suitable for power connection of large industrial machinery, such as injection molding machines and punching machines. At the same time, there may be flammable items in the plant, and the flame-retardant performance of the cable can reduce fire hazards and accident risks.
The underground parking lot has a humid environment and a closed space, so the cable needs to have good protection performance. The armoured layer of the cable can resist external impacts such as vehicle rolling and pipeline collision. The PVC insulation layer has certain moisture resistance and can operate reliably in the distribution system of the underground parking lot, providing power support for lighting, ventilation, charging piles and other equipment.
In addition, the cable can also play an important role in the power distribution of platforms and auxiliary facilities of rail transit such as subways and light rails. Its flame-retardant and armoured properties can adapt to the complex operating environment of rail transit and ensure the safe and stable power supply.
(3) Material and Style
Material
Conductor: High-purity copper is used as the Conductor Material, with a purity of more than 99.9%. High-purity copper has excellent conductivity, which can reduce energy loss during current transmission and ensure efficient power transmission. At the same time, copper has good ductility and Flexibility. After stranding, the mechanical strength of the conductor is enhanced, and it can withstand certain bending and stretching during cable laying and use, and is not easy to break.
Insulation layer: Flame-retardant polyvinyl chloride (PVC) material is used. This PVC material is added with flame retardants on the basis of ordinary PVC, so that it has good flame-retardant performance, with an oxygen index of ≥30, which can effectively inhibit the combustion and spread of flames. In addition, the PVC insulation layer also has excellent insulation performance, chemical corrosion resistance and weather resistance, and can maintain stable performance in the ambient temperature range of -15℃ to 60℃, suitable for use in different environments.
Armoured layer: There are two types of materials available: steel tape armouring and steel wire armouring. Steel tape armouring uses high-quality low-carbon steel tape with a thickness of about 0.3-0.5mm, which is wrapped around the outside of the cable insulation layer in a spiral winding manner, which can effectively enhance the cable's resistance to mechanical damage and resist external extrusion, collision and other impacts. Steel wire armouring uses high-strength steel wires, which form an armoured layer by braiding or winding. Compared with steel tape armouring, it has more excellent tensile and impact resistance, and is suitable for laying scenarios that need to bear large tension, such as vertical laying or deep buried situations.
Sheath layer: Some styles of cables are also provided with a PVC Sheath layer outside the armoured layer, which uses flame-retardant PVC material, matching the insulation layer material, to further enhance the protection performance of the cable, improve the weather resistance and corrosion resistance of the cable, and make the cable appearance more neat.
Style
The cable has a 4-core structure and a circular overall appearance. The outer diameter of the 25mm² cable is about 20-25mm, and that of the 35mm² cable is about 25-30mm. The outer diameter of cables with different armouring methods is slightly different. The outer diameter of
Steel Wire Armoured Cables is usually larger than that of steel tape
Armoured Cables of the same specification.
In terms of cable color, the PVC insulation layer and sheath layer are mostly black. Black has good ultraviolet resistance and is suitable for outdoor or exposed laying scenarios; cables used in some special occasions can also be customized to gray, white and other colors according to customer needs.
The surface of the cable is printed with clear marks, including product model, specification, rated voltage, manufacturer, flame-retardant grade, armouring type and other information, such as "ZR-YJV22-0.6/1kV-4×25", where "ZR" means flame-retardant, "YJV22" means cross-linked polyethylene insulated steel tape armoured polyvinyl chloride
Sheathed Cable (here, it is PVC insulated, and the mark will be adjusted accordingly), and "4×25" means 4-core 25mm², which is convenient for users to identify and select.
In addition, according to different laying methods, there are structural differences inside and outside the armoured layer. For example, the armoured layer is located between the insulation layer and the sheath layer, forming an "insulation layer - armoured layer - sheath layer" structure, ensuring that the layers are closely combined and play a synergistic protection role.
(4) Production Process
The production process of 25mm² and 35mm² 4-core armoured flame-retardant power cables is advanced and strict, ensuring that the quality and performance of the products meet relevant standards.
In the conductor manufacturing link, first, high-purity copper rods are drawn into copper wires of the required diameter through a wire drawing machine. During the wire drawing process, the drawing speed and mold precision are strictly controlled to ensure the uniform diameter of the copper wires. The drawn copper wires are annealed. The copper wires are heated to 300-500℃ and kept warm for a period of time to eliminate internal stress in the copper wires and improve their flexibility and conductivity. Then, according to the requirements of the 4-core structure, multiple copper wires are respectively stranded into single-core conductors. During the stranding process, the stranding pitch and tension are well controlled to ensure the roundness and structural stability of the conductor.
In the insulation layer extrusion process, flame-retardant PVC material is used. Flame-retardant PVC particles are added to the extruder, melted and plasticized at a temperature of 150-170℃, and then a layer of PVC insulation layer is uniformly extruded and coated on the surface of each single-core conductor through a mold. During the extrusion process, the extrusion temperature, speed and pressure are strictly controlled to ensure uniform sheath thickness, smooth surface, close combination of the insulation layer and the conductor, and no bubbles, impurities and other defects. The thickness of the insulation layer depends on the cable specification. The insulation layer thickness of the 25mm² cable is about 1.2mm, and that of the 35mm² cable is about 1.4mm.
In the cabling process, 4 single-core conductors with extruded insulation layers are cabled according to a certain stranding direction and pitch to form a 4-288ac2925daeccfc5b451252efd0f40
4 Core. During cabling, flame-retardant filling materials are filled in the conductor gaps to make the cable core structure round and enhance the flame-retardant performance of the cable at the same time. After filling, a layer of non-woven tape is wrapped around the outer layer of the cable core to play a role in fixing and isolating, preventing the insulation layer from being damaged in subsequent processes.
In the armouring process, steel tape armouring or steel wire armouring is selected according to customer needs. For steel tape armouring, high-quality low-carbon steel tape is wrapped around the outer layer of the cabled cable core in a spiral winding manner through an armouring machine. During the winding process, the tension and overlap rate of the steel tape are controlled (the overlap rate is not less than 15%) to ensure that the armoured layer is tight and flat, without loosening or wrinkling. For steel wire armouring, high-strength steel wires are braided or wound on the outer layer of the cable core with a certain density through a braiding machine or winding machine, and the firmness and uniformity of the armoured layer must also be ensured.
In the sheath extrusion process (if any), a layer of flame-retardant PVC sheath is extruded outside the armoured layer. Flame-retardant PVC particles are added to the extruder and melted, then uniformly extruded and coated on the outside of the armoured layer through a mold. The extrusion parameters are controlled to make the sheath thickness uniform, closely combined with the armoured layer, and the sheath surface is smooth without scratches, depressions and other defects.
During the production process, each process is equipped with strict quality inspection. The conductor process inspects the diameter, resistivity, tensile strength, etc. of the copper wire; the insulation layer process inspects the insulation thickness, insulation resistance, flame-retardant performance, etc.; the cabling process inspects the cabling pitch, filling situation, etc.; the armouring and sheath processes inspect the firmness of the armoured layer, sheath thickness, tensile strength, etc. The finished cable also needs to undergo overall withstand voltage test, flame-retardant test, mechanical performance test, etc. to ensure that the product meets relevant standards and technical requirements.
II. General Product Information
(1) Packaging
To ensure the quality of 25mm² and 35mm² 4-core armoured flame-retardant power cables during transportation and storage, the manufacturer adopts a professional packaging method.
For long-length cables, they are usually wound on steel cable reels. The diameter of the cable reel depends on the cable specification and length. The 25mm² cable can use a cable reel with a diameter of 1200mm, and the 35mm² cable uses a cable reel with a diameter of 1400mm. Both sides of the cable reel are equipped with solid baffles with a thickness of not less than 25mm, which can effectively prevent the cable from slipping during transportation. The center of the cable reel is provided with a shaft hole, which is convenient for handling and loading/unloading with hoisting equipment.
When the cable is wound on the cable reel, it is arranged neatly and tightly to avoid damage to the insulation layer or armoured layer caused by mutual friction. After winding, the outer layer of the cable is wrapped with a layer of plastic film to play the role of moisture-proof, dust-proof and oil-proof. On the side of each cable reel, the product's model, specification, length, weight, rated voltage, manufacturer, production date, implementation standard, flame-retardant grade, armouring type and other information are clearly marked, which is convenient for customers to identify when receiving and counting. The packaging is also printed with warning signs such as "Do not invert", "Handle with care", "Moisture-proof and sun-proof", "Keep away from fire sources" to remind transportation and storage personnel to pay attention to protecting the cable.
For short-length cables, such as samples or small orders, they are packaged in rolls. The cable is neatly wound into a roll, tightly wrapped with plastic film, and then put into a high-strength carton. The inside of the carton is padded with buffer materials (such as foam boards, bubble films) to prevent the cable from being squeezed and collided during transportation. The relevant information and warning signs of the product are also marked on the outside of the carton.
(2) Transportation
Transportation methods: According to the different transportation distance and order quantity, select the appropriate transportation method. For short-distance transportation (distance within 300 kilometers), road transportation is generally used, and trucks are used to load cable reels. The trucks need to be equipped with special fixing devices, such as steel wire ropes and tighteners, to firmly fix the cable reels in the carriage to prevent shaking during transportation. For long-distance transportation (distance over 300 kilometers), railway transportation or waterway transportation can be selected. Railway transportation has the characteristics of good stability and large carrying capacity, which is suitable for transporting large quantities of cables; waterway transportation has relatively low cost and is suitable for areas with ports.
Transportation precautions: During transportation, the cable reel must be placed horizontally, and it is strictly forbidden to tilt or invert to avoid the cable slipping from the cable reel and causing damage. A certain distance should be kept between cable reels, usually not less than 50cm, to prevent mutual collision and extrusion, which may cause damage to the cable insulation layer and armoured layer. Transport vehicles or means of transport should take rain-proof, sun-proof and dust-proof measures, such as covering with rain-proof cloth and installing sunshades, to avoid the cable being damp, exposed to direct sunlight or polluted by dust.
When loading and unloading the cable reel, special hoisting equipment, such as cranes and forklifts, must be used. The hoisting point should be selected at the lifting ring of the cable reel. Hoisting at the baffle or other parts is strictly prohibited to avoid damaging the cable reel and the cable. During the hoisting process, the cable reel should be kept stable to avoid violent shaking. During transportation, drivers should abide by traffic rules, drive smoothly, and avoid sudden braking, sharp turns and other operations to reduce the impact on the cable. At the same time, during transportation,
it is necessary to keep away from fire sources and avoid long-term transportation in high-temperature environments to prevent aging of the cable insulation layer.
(3) Delivery
Delivery time: After the customer confirms the order and makes payment, the manufacturer will arrange delivery as soon as possible. For in-stock specifications and models, they can usually be shipped within 1-3 working days; for customized special specifications or large quantities of orders, the production cycle depends on the actual situation, usually 7-15 working days. The manufacturer will communicate with the customer in advance to clarify the delivery time to ensure that the customer can reasonably arrange subsequent construction or installation plans.
Delivery process: Warehouse staff accurately pick cables of corresponding models, specifications and lengths according to the order information, and conduct strict checks to ensure that the product information is consistent with the order. After checking, conduct appearance and performance sampling inspections on the cables, check whether the insulation layer of the cable is intact, the armoured layer is firm, the marks are clear, the conductor is damaged, etc. After confirming that there are no quality problems, package them according to packaging standards.
Contact the cooperative logistics company, select appropriate transport vehicles and transportation methods according to the quantity of goods and transportation distance, safely load the cables onto the vehicles, and do a good job in fixing. After delivery, the manufacturer will promptly inform the customer of logistics information (including logistics company name, waybill number, contact information, etc.) via SMS, email or online platforms, facilitating the customer to track the transportation status of the goods. At the same time, the manufacturer will maintain close communication with the logistics company to keep abreast of the transportation progress of the goods and ensure that the goods can be delivered to the customer on time and safely.
(4) Samples
To enable customers to fully understand the quality and performance of the product before mass purchase, the manufacturer provides sample services.
Customers can apply for samples via phone, email, online customer service, etc., stating the required cable model, specification, armoured type and other information. After receiving the sample application, the manufacturer will prepare the samples within 1-3 working days. The length of the samples is generally 1-2 meters, which can meet the customer's testing needs for the cable's appearance, structure, insulation layer thickness, armoured layer quality, flame-retardant performance (relevant test reports can be provided), etc.
The quality of the samples is consistent with that of mass-produced products, and they are produced and tested in strict accordance with the same production process and quality standards. In terms of sample fees, ordinary customers need to pay a certain sample fee and freight, and the sample fee can be deducted when the customer makes subsequent mass purchases; for long-term cooperative old customers or large customers with clear intentions of mass purchase, the manufacturer can provide free samples, and the freight is borne by the customer or negotiated by both parties.
After the samples are sent, the manufacturer will promptly inform the customer of the courier information, including the courier company name and tracking number. After receiving the samples, if the customer has any questions about the samples or needs further technical support, the manufacturer's technical staff will promptly provide professional answers and services.
(5) After-sales Service
The manufacturer has a sound after-sales service system to provide customers with comprehensive after-sales guarantees, ensuring that customers have no worries during use.
Quality guarantee: This series of cables provides a 15-year warranty period. During the warranty period, if the cable cannot be used normally due to its own quality problems (such as conductor breakage, aging and damage of the insulation layer, falling off of the armoured layer, failure to meet flame-retardant performance standards, etc.), the manufacturer will replace the cable with a new one or repair it free of charge. If the cable is damaged due to improper installation, incorrect use, man-made damage and other non-product quality reasons, the manufacturer can also provide repair services, but corresponding repair fees and material fees will be charged.
Technical support: Customers can contact the manufacturer's technical staff at any time when encountering any technical problems during the installation, laying, use and maintenance of the cable. Technical staff will provide customers with professional technical guidance via phone, email, video, etc., including installation methods, laying precautions, fault diagnosis, daily maintenance, etc. For complex technical problems, the manufacturer can send technical staff to the site to provide support and services if necessary.
Complaint handling: If customers are dissatisfied with the product quality or service, they can complain via customer service hotlines, emails, online platforms, etc. The manufacturer will respond to the complaint within 24 hours, arrange special personnel to handle it, thoroughly understand the customer's demands, conduct investigations and analyses, and give a satisfactory solution within 7 working days. The manufacturer will promptly feedback the handling results to the customer to ensure that the customer's reasonable demands are met.
Regular return visits: The manufacturer will conduct regular return visits to customers who have purchased the products, usually once every six months, to understand the use of the cables, the customer's experience, and whether there are new demands. Through return visits, the manufacturer can promptly discover problems existing in the products, collect customers' opinions and suggestions, continuously improve product quality and service levels, and improve customer satisfaction and loyalty.
In conclusion, the 25mm² and 35mm² 4-core armoured flame-retardant power cables with
Copper Conductors and PVC insulation, produced by reliable manufacturers, rely on their excellent specifications and parameters, wide range of characteristic applications, high-quality materials and styles, advanced production processes, as well as perfect packaging, transportation, delivery, sample and after-sales services, and have become an ideal choice in the field of power transmission. They provide reliable guarantees for the safe and stable operation of power systems in various occasions, especially in places with high requirements for safety and durability.
English
Español
Pусский
Français
العربية
ไทย
Türk dili
Indonesia
Tiếng Việt
Telefone
Correspondência