I. Product-specific Information
(1) Specifications and Parameters
The 500mcm, 250mcm, and 127mm² copper
Electrical Wires have precise and detailed settings in terms of specifications and parameters to meet the power transmission needs in different scenarios.
"mcm" is the abbreviation of thousand circular mils, a common unit for wire specifications. 500mcm is approximately equivalent to 253mm², and 250mcm is about 126mm², which is very close to the 127mm² specification. These three specifications of
Copper Electrical Wires are all large-section wires, suitable for medium-high voltage or high-current power transmission scenarios.
In terms of conductivity, their conductivity is as high as 100% IACS (International Annealed Copper Standard), which means their conductivity meets the standard of high-quality copper materials, minimizing energy loss during current transmission. Current-carrying capacity is an important parameter to measure the transmission capacity of wires. At an ambient temperature of 25℃, the current-carrying capacity of 500mcm
Copper Electrical wire is about 600-650A, 250mcm is about 350-400A, and 127mm² is about 320-360A. Such current-carrying capacity enables them to efficiently transmit large amounts of power, meeting the high-load electricity demand in industrial production, large-scale buildings and other places.
The insulation performance parameters are also excellent. The insulation resistance of the insulation layer is not less than 1000MΩ·km at 20℃, which can effectively prevent current leakage and ensure the safety of power transmission. In addition, the voltage resistance performance of the wires has also undergone strict testing. The rated voltage of 500mcm and 250mcm wires can reach 10kV and above, and the rated voltage of 127mm² wires is usually 0.6/1kV, which can be selected according to different power system requirements.
In terms of mechanical properties, the conductors of these copper electrical wires have high tensile strength. The tensile strength of 500mcm and 250mcm wires is not less than 300MPa, and that of 127mm² wires is not less than 280MPa, which can withstand a certain degree of external tension without breaking easily. At the same time, they have good
Flexibility and small bending radius. The static bending radius of 500mcm and 250mcm wires is not less than 15 times the outer diameter of the cable, and the dynamic bending radius is not less than 20 times the outer diameter of the cable; the static bending radius of 127mm² wires is not less than 12 times the outer diameter of the cable, and the dynamic bending radius is not less than 15 times the outer diameter of the cable, which is convenient for laying and installation in complex environments.
(2) Characteristic Applications
The 500mcm, 250mcm, and 127mm² copper electrical wires have characteristic applications in many fields due to their excellent performance.
In industrial plants, there are many large mechanical equipment with high electricity load, and high requirements for the stability and reliability of power transmission. 500mcm copper electrical wires are often used to connect the main circuits of high-voltage motors, large transformers and other equipment, which can withstand the impact of large currents and ensure the normal operation of the equipment. 250mcm and 127mm² copper electrical wires are suitable for power distribution trunk lines and branch lines in the plant, providing stable power support for various production equipment, such as CNC machine tools and assembly line equipment.
The power distribution systems of large buildings are also inseparable from these copper electrical wires. In high-rise buildings, the power distribution trunk lines from the substation to each floor need to transmit a large amount of power. 500mcm and 250mcm copper electrical wires are ideal choices. They can efficiently transmit power in limited space, meeting the electricity demand of air conditioners, elevators, lighting and other equipment in the building. 127mm² copper electrical wires can be used for branch power distribution in the floor, connecting each distribution box and electrical terminal.
Substations are important hubs of the power system, and their outgoing lines need to have good conductivity and high-voltage resistance. 500mcm and 250mcm copper electrical wires are often used for high-voltage outgoing lines of substations, transmitting power from substations to various distribution networks to ensure stable power supply.
In new energy projects, such as photovoltaic power plants and wind farms, these copper electrical wires also play an important role. The connections between inverters and combiner boxes in photovoltaic power plants, and between generators and transformers in wind farms, all require large-section wires to transmit power. 500mcm, 250mcm, and 127mm² copper electrical wires can adapt to the outdoor environment of new energy projects, operate stably under complex conditions such as high temperature, low temperature, and humidity, and ensure efficient transmission of new energy power.
In addition, in the field of rail transit, the traction power supply systems of subways, light rails and other transportation facilities also use these copper electrical wires, which can meet the large current demand of traction motors and ensure the normal operation of trains.
(3) Material and Style
Material
Conductor: Oxygen-free copper is used as the Conductor Material, with a purity of up to 99.95% or more. Oxygen-free copper has extremely high conductivity, which can reduce energy loss during current transmission. At the same time, it has good thermal conductivity, facilitating heat dissipation and avoiding damage to the wire due to overheating. After annealing treatment, the flexibility of oxygen-free copper is greatly improved, so that the wire can withstand a certain degree of bending and stretching during laying without breaking easily.
Insulation layer: There are mainly two materials: cross-linked polyethylene (XLPE) and polyvinyl chloride (PVC). The XLPE insulation layer has excellent temperature resistance, with a long-term working temperature of up to 90℃ and a short-term overload temperature of up to 130℃, which can adapt to temperature changes during power transmission. At the same time, XLPE also has good chemical corrosion resistance, aging resistance and mechanical strength, with a long service life, suitable for power transmission in medium-high voltage and harsh environments. The PVC Insulation layer has relatively low cost, certain temperature resistance and insulation performance, with a long-term working temperature of 70℃, suitable for scenarios with relatively low performance requirements, such as power distribution lines in ordinary buildings.
Sheath (some styles): Some copper electrical wires used outdoors or in special environments are equipped with sheaths, and the sheath materials are mostly polyethylene (PE) or polyvinyl chloride (PVC). The PE sheath has good weather resistance, corrosion resistance and flexibility, which can protect the wire from the influence of the external environment; the PVC Sheath has good mechanical strength and flame retardancy, suitable for places with high safety requirements.
Style
These copper electrical wires have various styles, commonly including single-core and
Multi-Core. Single-core wires have a simple structure, consisting of a
Copper Conductor and an outer insulation layer, suitable for high-voltage and high-current power transmission. 500mcm and 250mcm copper electrical wires are mostly single-core styles. Multi-core wires are composed of multiple
Copper Conductors stranded together, with an insulation layer and a sheath (some styles) wrapped on the outer layer, having good flexibility and anti-interference performance. 127mm² copper electrical wires have both single-core and multi-core styles for selection.
In terms of appearance, the color of the wire varies according to the insulation layer material and purpose. Wires with XLPE insulation layers are mostly black, while wires with PVC insulation layers have various colors such as white and gray. The surface of the wire is usually printed with specifications, models, rated voltage, manufacturer and other marks, which is convenient for users to identify and select.
In addition, there are some special styles of copper electrical wires, such as armored wires, which have an additional layer of
Steel Tape or steel wire armor on the outer layer of the insulation layer, which can enhance the wire's resistance to mechanical damage, suitable for buried laying, tunnels and other scenes that are easily damaged by external forces.
(4) Production Process
The production process of 500mcm, 250mcm, and 127mm² copper electrical wires is advanced and complex, ensuring high product quality.
First, in the manufacture of conductors, high-purity oxygen-free copper rods are drawn into
Copper Wires of the required diameter through a wire drawing machine. During the wire drawing process, it is necessary to strictly control the drawing speed and mold precision to ensure the uniform diameter of the copper wires. The drawn copper wires need to be annealed. The copper wires are heated to a certain temperature (usually 300-500℃) and kept for a period of time to eliminate internal stress in the copper wires and improve their flexibility and conductivity. For large-section conductors, such as 500mcm and 250mcm, multiple copper wires need to be stranded together. During the stranding process, the stranding pitch and tension should be well controlled to ensure the roundness and structural stability of the conductor.
Next is the extrusion of the insulation layer. Different extrusion processes are adopted according to the material of the insulation layer. For the XLPE insulation layer, XLPE particles are added to the extruder, melted and plasticized at high temperature (about 120-180℃), and then uniformly extruded and coated on the surface of the conductor through a mold to form the insulation layer. After extrusion, the insulation layer is cross-linked, usually using a dry cross-linking process. The wire with the extruded insulation layer is put into a cross-linking tube, and cross-linking reaction is carried out in a high-temperature and high-pressure nitrogen environment, so that XLPE molecules form a three-dimensional network structure, thereby improving the temperature resistance, mechanical strength and insulation performance of the insulation layer. For the PVC insulation layer, PVC particles are heated and melted, then extruded and coated on the surface of the conductor. The extrusion temperature is about 150-170℃, and it can be cooled and shaped after extrusion.
For wires with sheaths, after the extrusion of the insulation layer, the extrusion of the sheath is also required. The sheath material (such as PE or PVC) is added to the extruder, heated and melted, then extruded and coated on the outer layer of the insulation layer to form the sheath. During the extrusion process, the temperature, speed and pressure should be controlled to ensure uniform thickness, smooth surface of the sheath, and close combination with the insulation layer.
For armored wires, armoring treatment is carried out before or after the sheath extrusion. Steel tape armoring is to wrap the steel tape around the outer layer of the wire through an armoring machine, and steel wire armoring is to braid the steel wire on the outer layer of the wire. During the armoring process, the density and tension of wrapping or braiding should be controlled to ensure the firmness and protective performance of the armor layer.
During the production process, each process must undergo strict quality inspection, including the detection of conductor diameter, resistivity, tensile strength, insulation layer thickness, insulation resistance, voltage resistance performance, sheath thickness, tensile strength and other indicators. Finished wires also need to undergo multiple performance tests such as partial discharge test and aging test to ensure that the products meet relevant standards and technical requirements.
II. General Product Information
(1) Packaging
To ensure the quality of 500mcm, 250mcm, and 127mm² copper electrical wires during transportation and storage, a professional and reliable packaging method is adopted.
For long-length wires, they are usually wound on steel cable reels. The diameter of the cable reel depends on the specification and length of the wire. Due to their large cross-section, 500mcm and 250mcm wires generally use cable reels with a diameter of 1800-2400mm; 127mm² wires can use cable reels with a diameter of 1200-1600mm. Both sides of the cable reel are equipped with solid baffles with a thickness of not less than 30mm, which can effectively prevent the wire 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 wire is wound on the cable reel, it is arranged neatly and tightly to avoid damage to the insulation layer caused by mutual friction. After winding, the outer layer of the wire is wrapped with a layer of plastic film to play the role of moisture-proof, dust-proof and oil-proof. For each reel of wire, the product's model, specification, length, weight, rated voltage, manufacturer, production date, implementation standard and other information are clearly marked on the side of the cable reel, 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" to remind transportation and storage personnel to pay attention to protecting the wire.
For short-length wires, such as samples or small orders, they are packaged in rolls. The wire 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 or bubble film, to prevent the wire 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 wires; 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 wire slipping from the cable reel and causing damage. A certain distance should be kept between cable reels, usually not less than 1 meter, to prevent mutual collision and extrusion, which may cause damage to the wire insulation layer and conductor. 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 wire 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 wire. 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 wire.
(3) Delivery
Delivery time: After the customer confirms the order and makes payment, we will arrange delivery as soon as possible. For specifications and models in stock, they can usually be shipped within 1-3 working days; for customized specifications or large quantities of orders, the production cycle depends on the actual situation, usually 7-15 working days. We will communicate with the customer in advance to clarify the delivery time to ensure that the customer can reasonably arrange the subsequent construction or installation plan.
Delivery process: Warehouse personnel accurately pick wires 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 inspection on the wire, check whether the insulation layer of the wire is intact, the marks are clear, the conductor is damaged, etc., and after confirming that there is no quality problem, package it according to the packaging standards.
Contact the cooperative logistics company, select the appropriate transport vehicle and transportation method according to the quantity of goods and transportation distance, and safely load the wire onto the vehicle and do a good job of fixing. After delivery, we will promptly inform the customer of logistics information (including logistics company name, waybill number, contact information, etc.) through SMS, email or online platforms, to facilitate the customer to track the transportation status of the goods. At the same time, we 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 allow customers to fully understand the quality and performance of the product before mass purchase, we provide sample services.
Customers can apply for samples through telephone, email, online customer service, etc., stating the model, specification, quantity and other information of the required wire. After receiving the sample application, we 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 appearance, structure and basic performance (such as insulation resistance, diameter, etc.) of the wire.
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 intention of mass purchase, we can provide free samples, and the freight is borne by the customer or negotiated by both parties.
After the sample is sent, we will promptly inform the customer of the courier information, including the courier company name and tracking number. After the customer receives the sample, if they have any questions about the sample or need further technical support, our technical staff will provide professional answers and services in a timely manner.
(5) After-sales Service
We have a comprehensive after-sales service system to provide customers with all-round after-sales support, ensuring that customers have no worries during use.
Quality Guarantee: This series of copper electrical wires comes with a 20-year warranty period. During the warranty period, if the wire fails to function normally due to its own quality issues (such as conductor breakage, aging and damage of the insulation layer, sheath cracking, etc.), we will provide free replacement of new wires or repair services for the customer. For wire damage caused by non-product quality reasons such as improper installation, incorrect use, or man-made damage by the customer, we can also provide repair services, but corresponding repair fees and material costs will be charged.
Technical Support: Customers can contact our technical staff at any time if they encounter any technical problems during the installation, laying, use, and maintenance of the wires. Technical staff will provide professional technical guidance to customers through phone calls, emails, videos, etc., including installation methods, laying precautions, fault diagnosis, daily maintenance, and other content. For complex technical problems, if necessary, we can dispatch technical staff to the site to provide support and services.
Complaint Handling: If customers have any dissatisfaction with product quality or services, they can file a complaint through customer service hotlines, emails, online platforms, and other channels. We will respond to the complaint within 24 hours, arrange a dedicated person to handle it, thoroughly understand the customer's demands, conduct investigations and analyses, and provide a satisfactory solution within 7 working days. We will promptly feedback the handling results to the customer to ensure that the customer's reasonable demands are met.
Regular Return Visits: We will conduct regular return visits to customers who have purchased our products, with a return visit cycle of generally once every six months, to understand the usage of the wires, the customer's usage experience, and whether there are new demands. Through return visits, we can promptly discover problems existing in the products, collect customers' opinions and suggestions, continuously improve product quality and service levels, and enhance customer satisfaction and loyalty.
In conclusion, the 500mcm, 250mcm, and 127mm² copper electrical wires, with their excellent specifications and parameters, wide range of characteristic applications, high-quality materials and styles, advanced production processes, as well as comprehensive services in packaging, transportation, delivery, samples, and after-sales, have become an ideal choice in the field of power transmission, providing reliable guarantees for the safe and efficient operation of various power systems.
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