Rated Voltage: The rated voltage of this wire is 600V, which is designed in accordance with the standards of low-voltage power distribution systems and can meet the power needs of low-voltage electrical equipment in most construction and industrial scenarios. In practical applications, its working voltage is always controlled within the range of the rated voltage, which can effectively avoid safety hazards such as insulation layer damage and short circuits caused by excessive voltage, ensuring the stability and safety of power transmission.

Conductor Specification: The conductor is made of high-purity electrolytic copper with a purity of over 99.95%, which gives the conductor excellent conductivity with a conductivity of more than 100% IACS (International Annealed Copper Standard), minimizing energy loss during current transmission. The cross-sectional area of the conductor is 14mm², and this specification endows it with strong current-carrying capacity. When laid in air, the current-carrying capacity can reach 70-85A. The specific current-carrying capacity is affected by many factors. For example, when the ambient temperature rises, the current-carrying capacity will decrease accordingly. At 40℃, the current-carrying capacity is about 15% lower than that at 25℃; when laid through a pipe with a large number of cables in the pipe, the current-carrying capacity will also decrease, usually by about 20%.

Conductor Structure: The conductor is made of multiple strands of fine copper wires, generally consisting of 37 fine copper wires with a diameter of 0.52mm. The stranding pitch is strictly controlled between 15-20mm. This structural design not only enhances the Flexibility of the conductor, enabling it to easily bend and thread in complex wiring environments, facilitating construction operations, but also effectively reduces the loss caused by the skin effect and improves the efficiency of current transmission. At the same time, the stranded structure also improves the tensile and vibration resistance of the conductor. Tests show that its tensile strength is not less than 200MPa, which can withstand a certain degree of tension and vibration during construction and use, prolonging the service life of the wire.

Insulation Layer Parameters: The insulation layer is made of cross-linked polyethylene (XLPE) material with a thickness of about 1.0-1.2mm. For the Thhn model, its insulation layer is suitable for dry environments and can work stably for a long time at a high temperature of 90℃; the insulation layer of the Thwn-2 model has undergone special treatment and can maintain good performance in humid environments or short-term immersion in water, with a temperature resistance level of 90℃. The insulation resistance of both types of insulation layers is not less than 100MΩ, which can effectively prevent current leakage and ensure electrical safety. In addition, the insulation layer also has good mechanical strength, with a tensile strength of not less than 12MPa and an elongation at break of not less than 150%, which can resist mechanical wear during construction and accidental collisions in daily use. At the same time, it has excellent chemical stability and can resist the erosion of common chemical substances such as acids, alkalis, and oils.

Overall Size: The overall outer diameter of the wire is determined by the conductor diameter and the thickness of the insulation layer, which is about 6.5-7.0mm. This size design is reasonable, which not only ensures the stability of the internal structure of the wire but also facilitates laying in narrow spaces such as pipes and trunking, without increasing the construction difficulty due to excessive outer diameter, thus improving the flexibility of construction.

Length Specification: Common wire lengths on the market include 100 meters, 200 meters, 300 meters, 500 meters, etc., in coiled packaging. They can also be customized according to the special needs of customers, with a maximum customization length of 1000 meters. The length error is controlled within ±0.5% to ensure that the actual length is basically consistent with the marked length, meeting the laying needs of different projects and avoiding waste caused by insufficient or excessive length.

Weight Parameters: The weight of each meter of wire is about 0.16kg, and the weight of a 100-meter-long wire is about 16kg. This weight is convenient for handling during transportation and installation. Construction personnel do not need to use large lifting equipment and can carry it manually, improving the convenience of construction.

Commercial Building Field: In commercial buildings, 14mm² Thhn/Thwn-2 600V Copper Wires are widely used. They can be used to connect central air conditioning systems, providing stable power support for their compressors, fans and other equipment, ensuring that the central air conditioning can operate normally in hot summer or cold winter and maintaining a comfortable temperature in commercial places. Elevator room equipment is also an important application object. The traction machine, control cabinet and other parts of the elevator need reliable power supply, and this wire can meet their power demand, ensuring the safe and stable operation of the elevator. In addition, emergency lighting lines use this wire, which can ensure that emergency lights are turned on in time when the commercial power is interrupted, providing lighting for personnel evacuation and ensuring personnel safety.

Industrial Field: In the industrial field, this wire is suitable for the power supply circuit of production line motors, such as drive motors of various machine tools and assembly line equipment. Its stable current-carrying capacity and good vibration resistance can ensure the continuous and stable operation of the motors, improving production efficiency. Ventilation equipment, such as industrial exhaust fans and blowers, also relies on this wire for power transmission to ensure air circulation in the workshop and improve the working environment. In industrial environments with certain humidity or temperature fluctuations, such as cleaning workshops in food processing plants and some production areas in chemical plants, the Thwn-2 model wire has more obvious advantages. Its moisture resistance and temperature resistance can adapt to harsh environmental conditions and ensure stable power supply. At the same time, the power supply circuit of the control system can also use this wire to provide reliable power for PLC control cabinets, sensors and other equipment, ensuring the normal operation of industrial production automation control.

Civil Residential Field: In civil residences, this wire can be used as the incoming main line to introduce external power into the main distribution box inside the residence, and then distribute it to various rooms and electrical equipment through the branch distribution box. For high-power electrical appliances, such as electric heating equipment, whole-house water purification equipment, instant electric water heaters, etc., with a power usually above 5kW, a dedicated power supply line is required. This wire can provide safe and stable power support for them, avoiding safety accidents caused by line overload. In areas with high humidity in residences, such as basements and bathrooms, Thwn-2 model wires can be selected, while in dry areas such as living rooms and bedrooms, Thhn model wires can be selected to meet the power demand of different areas.

Conductor Material: The conductor is made of high-purity electrolytic copper, which is made through electrolytic refining process to remove impurities, with a purity of more than 99.95%. This kind of copper has extremely high conductivity, which can effectively reduce energy loss during current transmission and improve power transmission efficiency. At the same time, electrolytic copper has good ductility and toughness, which is not easy to break during stranding, ensuring the stability of the conductor structure. In addition, the surface of electrolytic copper is smooth and not easy to oxidize, and can maintain good conductivity during long-term use, prolonging the service life of the wire.

Insulation Layer Material: The insulation layer is made of cross-linked polyethylene (XLPE) material, which is obtained by cross-linking polyethylene and has excellent temperature resistance, moisture resistance and insulation performance. Compared with traditional polyvinyl chloride (PVC) Insulation Materials, XLPE has a higher temperature resistance level, can work for a long time at 90℃, and has stable performance in humid environments. At the same time, XLPE material has high mechanical strength and good anti-aging performance, which can maintain good insulation performance and mechanical performance for a long time, ensuring the safe and reliable operation of the wire.

Style Design: The wire is cylindrical in shape with a smooth and flat appearance. The insulation layer has various colors, commonly including black, red, blue, yellow, etc. Insulation layers of different colors are convenient for distinguishing phase sequences and circuits during wiring. For example, black can be used as the phase line, blue as the neutral line, and yellow-green as the ground line (it should be noted that the wire itself is not directly used as the ground line, which is only an example of color distinction here), reducing the risk of misconnection and improving construction efficiency. The wire is usually packaged in coils, and the reel is made of high-strength plastic. The inner diameter of the reel is 50-60mm, and the outer diameter depends on the length of the wire. For example, the outer diameter of the reel for a 100-meter-long wire is about 300mm. There are baffles at both ends of the reel to prevent the wire from loosening during storage and transportation, protecting the wire from damage.

Copper Smelting and Drawing: First, high-purity copper raw materials are put into a melting furnace for smelting. The smelting temperature is controlled at 1100-1200℃ to remove impurities in the copper, and copper water with a purity of more than 99.95% is obtained. The copper water is made into copper rods with a diameter of 8mm through continuous casting process. After cooling, the copper rods enter the wire drawing process. During the drawing process, the copper rod is gradually drawn through multiple wire drawing dies with different apertures, and finally made into fine copper wires with a diameter of 0.52mm. The drawing speed is controlled at 8-10m/s, and the mold is cooled by water at the same time to ensure that the diameter of the copper wire is uniform, the surface is smooth, and there are no scratches, cracks and other defects. The drawn copper wire is annealed at 400-450℃ for 2-3 hours to eliminate the internal stress generated during the drawing process and improve the flexibility and ductility of the copper wire.

Conductor Stranding: 37 fine copper wires with a diameter of 0.52mm are stranded at a pitch of 15-20mm by stranding equipment. The stranding equipment adopts a multi-head stranding machine, which can accurately control the tension of each copper wire to ensure that the Stranded Conductor has a compact and round structure, and the cross-sectional size meets the requirements of 14mm². During the stranding process, the diameter of the conductor is monitored in real-time, and the deviation is controlled within ±0.1mm. After stranding, the conductor is inspected for appearance to ensure that there are no loose strands, broken wires and other phenomena.

Insulation Layer Extrusion and Cross-linking: The extrusion molding process is used to wrap the XLPE insulation layer on the outer layer of the stranded conductor. First, XLPE particles are added into the hopper of the extruder and heated to melt, with the melting temperature controlled at 180-200℃. The molten XLPE material is evenly coated on the surface of the conductor through the die of the extruder. The size of the die is determined according to the thickness of the insulation layer and the diameter of the conductor to ensure that the thickness of the insulation layer reaches 1.0-1.2mm. The extrusion speed is matched with the traction speed of the conductor, controlled at 5-8m/min to ensure that the insulation layer is uniform. The extruded wire enters the cross-linking pipe for cross-linking treatment. The cross-linking method can be warm water cross-linking or steam cross-linking, so that the XLPE molecules form a three-dimensional network structure, improving its temperature resistance, mechanical strength and insulation performance. The cross-linked wire is cooled in a cooling water tank to make the insulation layer solidify quickly.

Quality Inspection: Strict quality inspection procedures are set up in each link of the production process. After copper wire drawing, parameters such as diameter, tensile strength and elongation of the copper wire are tested; after conductor stranding, DC resistance, cross-sectional area and appearance of the conductor are tested; after insulation layer extrusion and cross-linking, thickness, insulation resistance, voltage resistance performance and temperature resistance performance of the insulation layer are tested. The finished wire also needs to undergo bending test, wear test, aging test, etc. For example, in the withstand voltage test, the wire must not break down under 1500V voltage for 1 minute; in the bending test, the wire is bent 180 degrees with a radius 6 times the outer diameter of the cable, and after 10 repetitions, the insulation layer has no cracks. Only products that pass all inspection items can leave the factory.

Packaging Materials: The wire uses high-strength plastic reels as the main packaging material. The plastic reels are made of polypropylene (PP), which has the characteristics of compression resistance, drop resistance and corrosion resistance, and can bear the weight of the wire and the impact force during transportation. The two ends of the reel are provided with metal flanges to enhance the strength of the reel. For coiled wires, first wrap a layer of moisture-proof paper, which has good moisture-proof performance and can effectively prevent the wire from getting damp. Then wrap with plastic film, which not only plays a dust-proof role but also fixes the wire on the reel to prevent the wire from loosening. For wires with longer length and larger weight, a wooden frame is also put on the outside of the reel to further protect the wire from damage during transportation.

Packaging Method: The wire is neatly wound on the plastic reel, and each layer must be tightly arranged without crossing or twisting. After winding, wrap the outer layer of the wire with moisture-proof paper, and the overlapping width of the moisture-proof paper is not less than 50mm to ensure the moisture-proof effect. Then wrap the plastic film from one end of the reel to the other end, keeping appropriate tension during winding to make the plastic film closely fit the wire. On the obvious position of the package, labels are used to mark the product name, model (Thhn/Thwn-2), specification (14mm², 600V), length, production date, batch number, execution standard, manufacturer name and contact information. For wires packaged with wooden frames, the frame and the reel are fixed with bolts to prevent the reel from shaking in the frame.

Packaging Marks: In addition to basic product information, the package also prints some warning marks, such as "Keep Away from Fire", "Moisture-Proof", "Handle with Care", "Stacking Limit", etc. The "Stacking Limit" mark indicates the maximum number of layers that the packaged wires can be stacked, usually no more than 3 layers, to prevent the lower package from being damaged by pressure. The marks are printed with sun-resistant and wear-resistant ink to ensure that they do not fade or blur during outdoor storage and long-distance transportation and are clearly readable.

Transportation Methods: According to the customer's geographical location and order quantity, select the appropriate transportation method. For short-distance transportation (such as within a radius of 500 kilometers), road transportation is adopted, and van trucks with rainproof and sun-proof facilities are selected. The bottom of the truck's carriage is paved with moisture-proof wooden boards to prevent the wires from getting damp. For long-distance transportation, railway transportation or water transportation is adopted. Railway transportation uses container transportation, and the container is kept dry and clean; water transportation stores the wires in the cabin, away from water sources and corrosive substances, and takes good fixing measures to prevent the wires from shaking and colliding during navigation. For emergency orders, air transportation can be adopted, which is fast and can ensure that the products are delivered to customers in the shortest time, but the transportation cost is relatively high.

Transportation Precautions: During transportation, the wires should avoid severe collision, extrusion, exposure to the sun and rain. When loading, the wire reels should be placed horizontally, with the axis consistent with the driving direction of the vehicle, avoiding stacking too high. When stacking, wooden boards are placed between the upper and lower reels to prevent mutual extrusion. For wires packaged with wooden frames, the frames are fixed on the transport tool with steel wire ropes or fastening belts to ensure that they do not shift during transportation. During transportation, the wire should be avoided from contact with sharp objects to avoid damaging the insulation layer and packaging. At the same time, the temperature of the transportation environment should be controlled between -20℃ and 50℃, and the relative humidity should not exceed 85% to avoid extreme temperatures and humid environments affecting the performance of the wire.

Transportation Tracking: The company cooperates with professional logistics companies to provide customers with full transportation tracking services. Customers can query the transportation location, transportation status and estimated arrival time of the wire by entering the waybill number through the logistics query system on the company's official website or the customer service hotline of the logistics company. If abnormal situations such as traffic jams and bad weather are encountered during transportation, the logistics company will timely communicate with customers and the company, explain the situation and adjust the transportation plan to ensure that the wires can arrive on time.

Delivery Process: After receiving the customer's order, the sales department first conducts order review to confirm whether the product model, specification, quantity, delivery date, delivery address and other information are accurate. After passing the review, the order information is transmitted to the warehouse department. Warehouse personnel retrieve the corresponding wires from the inventory according to the order information, conduct quantity checking and appearance inspection to ensure that the wire packaging is intact, the logo is clear and there is no damage. After goods preparation is completed, warehouse personnel transport the wires to the delivery area and notify the logistics department to arrange transportation. The logistics department connects with the logistics company to determine the transport vehicle and transport route, and go through relevant transport procedures. Before delivery, the sales department notifies the customer of the delivery information (including the name of the logistics company, waybill number, estimated arrival time, etc.) via SMS, email, etc., so that the customer can prepare for receipt.

Sample Provision: To allow customers to better understand the performance and quality of the product, the company provides sample services. Customers can apply for samples to the company, indicating the specifications, quantity and purpose of the required samples, usually 1-2 meters. The production process and quality standards of the samples are consistent with the bulk products, which can truly reflect the actual situation of the products, allowing customers to have an intuitive understanding of the products before purchasing.

Sample Fees: The samples themselves are provided free of charge, but the transportation cost of the samples is borne by the customer. Customers can choose to pay the freight by cash on delivery or pay the freight to the company in advance, and the company will arrange the transportation on their behalf. If the customer places a bulk order within 3 months after receiving the sample, the transportation cost of the sample can be deducted from the payment, saving costs for the customer.

Sample Delivery: After the samples are prepared, they are sent to customers by express within 1-2 working days. The samples are packaged in small plastic reels or sealed bags, with the product name, specifications and sample marks on the package. The company will promptly inform the customer of the express waybill number to facilitate the customer to track the logistics information of the sample and ensure that the sample can be delivered smoothly.

Quality Guarantee: The company provides a 3-5 year quality guarantee period for 14mm² Thhn/Thwn-2 600V copper wires, and the specific guarantee period depends on the use scenario of the product. Wires used in dry and mild environments have a 5-year quality guarantee period; wires used in humid, high-temperature or chemically corrosive environments have a 3-year quality guarantee period. During the quality guarantee period, if the failure or damage is caused by the product's own quality problems (such as substandard conductivity of the conductor, aging and cracking of the insulation layer, failure to meet the requirements of temperature and moisture resistance, etc.), the company will provide free repair or replacement services for the customer.

After-sales Service Response: The company has set up a special after-sales service department, equipped with professional technical personnel and customer service personnel, providing 24-hour after-sales service hotline and online customer service support. Customers can contact the after-sales service department by phone, email, online customer service, etc. when encountering any problems during use. After receiving the customer's feedback, after-sales service personnel will respond within 1 hour to understand the details of the problem; for problems requiring technical support, technical personnel will be arranged to answer or propose solutions within 24 hours; for problems requiring on-site handling, technical personnel will be dispatched to the site within 48-72 hours according to the distance from the customer's location.

Technical Support: The company provides professional technical support services for customers, including product selection consultation, installation guidance, use and maintenance training, etc. In the stage of customer's project design, technical personnel can provide reasonable wire selection suggestions according to the project's power load and environmental conditions, and calculate the current-carrying capacity and laying methods under different working conditions. During the installation process, the company can send technical personnel to the site for guidance if necessary, answer the installation problems encountered by the construction personnel, and ensure that the installation meets the specifications. In addition, the company regularly organizes online technical training courses to explain the performance characteristics, installation precautions, maintenance methods, etc. of the product, helping customers better use and maintain the wire.

Return and Exchange Policy: If the customer finds that the received wire has quality defects (such as insulation layer damage, conductor breakage, inconsistent specifications, etc.) or does not meet the order requirements (wrong model, specification, length, etc.) within 7 days of receipt, they can apply for return or exchange. To initiate the process, the customer needs to provide photos or videos of the problem, the original purchase invoice and packaging. After the company's quality inspection department confirms the problem, the return or exchange will be arranged immediately. The round-trip transportation costs for valid return or exchange applications are borne by the company. For returns or exchanges caused by customer factors (such as wrong order placement, changes in project plans, damage caused by improper storage or installation, etc.), the customer shall bear the transportation costs and depreciation fees. The depreciation fee is calculated according to the degree of use and damage of the product, generally ranging from 10% to 30% of the product price.