Detailed Introduction to Thhn/Thwn Cable 4 AWG (21.5mm²)
I. Product - related Information
(I) Specification Parameters
Voltage Level
The designed voltage level of this cable is 600V, which enables it to play an important role in various medium and low - voltage power transmission scenarios. In industrial production, the operating voltage of many small and medium - sized equipment is in the medium and low - voltage range. The
600V Cable can provide stable power support for these equipment, ensuring their normal operation. In the power distribution systems of commercial and civil buildings, 600V is also a common voltage level, and this cable can well adapt to the power transmission needs of these scenarios.
Conductor Specification
The conductor specification is 4 AWG (American Wire Gauge), corresponding to a cross - sectional area of 21.5mm². The 4 AWG conductor has excellent performance in terms of current - carrying capacity, with a current - carrying capacity of 70 - 95A (the specific value will vary with the ambient temperature). At an ambient temperature of 30℃, the current - carrying capacity is about 85A; when the ambient temperature rises to 40℃, the current - carrying capacity will decrease slightly, about 75A. This range of current - carrying capacity allows it to meet the load requirements of most small and medium - sized electrical systems, such as small industrial machinery, lighting systems in commercial buildings, air conditioning equipment, etc.
Conductor Structure
The conductor adopts a multi - strand stranded design, composed of multiple small
Copper Wires stranded together. The number of stranded strands is precisely calculated, usually [X] strands. This structure not only enhances the
Flexibility of the conductor but also improves its mechanical strength. The diameter of the conductor also has strict standards. The diameter of a single copper wire is about [X]mm, and the outer diameter of the
Stranded Conductor is about [X]mm, ensuring the stable overall performance of the conductor.
Insulation Layer Parameters
The insulation layer is made of polyvinyl chloride (PVC) material, with a thickness of about [X]mm. The
PVC Insulation layer has good insulation performance, with an insulation resistance of not less than [X]MΩ·km, which can effectively prevent current leakage and ensure the safety of power transmission. In terms of temperature resistance, Thhn
Type Cables can withstand a high temperature of 90℃ in dry environments, and Thwn type cables can maintain stable performance at 60℃ in humid environments, which enables the cables to work normally in different temperature environments.
Sheath Parameters
The outer sheath is made of nylon material, with a thickness of about [X]mm. The
Nylon Sheath has high tensile strength, with a tensile strength of not less than [X]MPa, which can withstand a certain external pulling force without breaking. At the same time, the nylon sheath has excellent wear resistance. After the wear test, the wear amount of the sheath is very small under a certain number of friction times, which can effectively protect the internal structure of the cable from external friction damage.
(II) Characteristic Uses
Industrial Field
In the industrial field, this cable has a wide range of applications. For small industrial machinery, such as small lathes, milling machines, drilling machines, etc., the power of these equipment is relatively small. The current - carrying capacity of the 4
AWG Cable can meet their power needs, providing stable power for the operation of the equipment. In the connection of control cabinets in industrial production lines, this cable also plays an important role. The signal transmission and power supply between the control cabinet and various equipment require reliable cables. The stability and safety of Thhn/Thwn Cable 4 AWG (21.5mm²) can ensure the normal operation of the production line. In addition, this cable can also be well adapted to the lighting systems and auxiliary equipment power supply in industrial plants.
Commercial Building Field
The power demand in commercial buildings is complex and diverse, and this cable can meet the needs of various scenarios. In the lighting system, a large number of lighting equipment are needed in public areas, offices, shops, etc. of commercial buildings. The current - carrying capacity of the 4 AWG cable can support the simultaneous operation of these lighting equipment, and the performance of the PVC insulation layer and nylon sheath can ensure the safety and stability of the lighting system. In the air conditioning system, the connection between the indoor and outdoor units of small central air conditioners and the power supply of fan coils can use this cable, and its temperature resistance and moisture resistance can adapt to the environmental changes when the air conditioning equipment is running. In addition, the power distribution lines of elevators, escalators and other equipment in commercial buildings can also use this cable.
Civil Building Field
In civil buildings, this cable can be used to connect household distribution boxes with electrical equipment in various rooms, such as refrigerators, washing machines, air conditioners and other high - power electrical appliances, which can ensure the normal power consumption of these electrical appliances. In the public areas of residential buildings, such as corridor lighting, emergency lighting and other lines, this cable can also play a role. In addition, in some small civil facilities, such as community activity centers and small supermarkets, the performance of this cable can also meet their power transmission needs.
Outdoor Temporary Power Supply Field
Outdoor temporary power supply systems have high requirements for the environmental adaptability of cables. The moisture resistance of Thwn type cables enables them to play an important role in outdoor temporary power supply scenarios. On construction sites, temporarily built power distribution systems need to be connected to various construction equipment, such as electric welders, cutting machines, mixers, etc. The current - carrying capacity of the 4 AWG cable can meet the power needs of these equipment, and the wear resistance and chemical corrosion resistance of the nylon sheath can resist friction, oil pollution and other erosion in the construction environment. At outdoor event sites, such as concerts and sports meetings, the power supply lines of temporary lighting, audio equipment, etc. can also use this cable to ensure the smooth progress of the events.
(III) Material and Style
Conductor Material
The conductor is made of high - purity electrolytic copper with a purity of more than 99.95%. High - purity copper has excellent conductivity, with a conductivity of more than [X]S/m, which can reduce energy loss during current transmission and improve power transmission efficiency. At the same time, electrolytic copper has good ductility and flexibility, which is convenient for processing into small copper wires for stranding, and is not easy to break during stranding, ensuring the mechanical properties of the conductor.
Insulation Material
The insulation layer is made of polyvinyl chloride (PVC) material. PVC is a commonly used insulation material with good insulation performance, chemical corrosion resistance and processing performance. It can effectively isolate the conductor from the external environment, prevent current leakage, and ensure the safety of power transmission. PVC material also has a certain flame - retardant performance. In case of fire, it can delay the spread of the fire, buying time for personnel evacuation and fire fighting and rescue.
Sheath Material
The outer sheath is made of nylon material. Nylon is a synthetic fiber with high strength, wear resistance and chemical corrosion resistance. It can protect the conductor and insulation layer inside the cable from external mechanical damage, friction and chemical erosion, extending the service life of the cable. The surface of the nylon sheath is smooth, which makes the cable have small resistance during installation processes such as pipe threading and laying, facilitating construction.
Style Design
The cable adopts a circular design. The circular cross - section makes the cable bear force evenly during laying, reducing local wear caused by irregular shapes. The color of the cable is usually black. Black has good light resistance, which can reduce the aging effect of direct sunlight on the cable sheath and extend the service life of the cable. In addition, the overall structure of the cable is compact, and the outer diameter is moderate, which is convenient for installation and arrangement in various complex wiring environments.
(IV) Production Process
Conductor Manufacturing
First, high - purity electrolytic copper raw materials are made into copper rods through smelting, ingot casting and other processes. Then, the copper rod is 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 temperature to ensure the quality of the copper wire. The drawn copper wire needs to be annealed to eliminate internal stress and improve the flexibility and ductility of the copper wire. Finally, multiple copper wires are stranded according to a certain stranding method to form a 4 AWG conductor. During the stranding process, it is necessary to ensure that the tension of each copper wire is uniform to ensure the stable structure and consistent conductivity of the conductor.
Insulation Layer Extrusion
The extrusion molding process is used to wrap the PVC insulation layer around the conductor. First, PVC particles are added to the hopper of the extruder, heated and melted, and then evenly wrapped around the surface of the conductor through an extrusion die. During the extrusion process, it is necessary to accurately control the extrusion temperature, speed and pressure to ensure that the insulation layer has a uniform thickness, a smooth surface, and is closely combined with the conductor. After extrusion, the insulation layer needs to be cooled and shaped, usually by water cooling, to make the insulation layer solidify quickly.
Sheath Extrusion
The nylon sheath is wrapped around the insulation layer through the extrusion process. Similar to the extrusion of the insulation layer, the nylon material is heated and melted, and then wrapped around the surface of the insulation layer through the die of the extruder. It is also necessary to control the extrusion temperature, speed and pressure to ensure that the sheath has a uniform thickness, a smooth surface, and is closely combined with the insulation layer. The extrusion of the nylon sheath can further protect the internal structure of the cable and improve the overall performance of the cable.
Quality Inspection
Strict quality inspection is required for each process during production. The diameter, DC resistance, tensile strength and other parameters of the conductor need to be sampled and tested to ensure compliance with relevant standards. The thickness, insulation resistance, voltage resistance performance, temperature resistance performance and other indicators of the insulation layer need to be tested to ensure the quality of the insulation layer. The thickness, tensile strength, wear resistance, chemical corrosion resistance and other properties of the sheath need to be inspected. The finished cable also needs to undergo overall performance tests, such as bending resistance test and aging resistance test, to ensure that the quality of the cable meets the requirements.
II. General Product Information
(I) Packaging
Packaging Materials
Cables are usually packaged with wooden or steel reels. Wooden reels have low cost and light weight, and are suitable for short - distance transportation and packaging of small batches of cables. Steel reels have high strength and large load - bearing capacity, and are suitable for long - distance transportation and packaging of large batches of cables. The size of the reel is determined according to the length and diameter of the cable. Generally, the diameter of the reel is [X]mm and the width is [X]mm, which can accommodate a certain length of cable. On the outside of the cable reel, a layer of plastic film is usually wrapped to prevent the cable from being polluted and eroded by dust, moisture, etc. during transportation and storage.
Packaging Method
The cable is neatly wound on the reel. During the winding process, it is necessary to control the winding tension to avoid the cable being too tight or too loose. Being too tight may cause the cable to deform or be damaged, while being too loose may cause the cable to loosen and rub against each other during transportation. After winding, the cable is fixed on the reel with packing belts to prevent the cable from sliding during transportation. On the side of the reel, a product label is pasted, which indicates the product name, specification, length, voltage level, manufacturer, production date, product number, etc., facilitating identification and traceability.
Packaging Marks
In addition to the information on the product label, some warning marks, such as "Do Not Invert", "Handle with Care", "Moisture - Proof", etc., are marked in obvious positions on the reel to remind transportation and handling personnel to pay attention to the correct operation mode. For exported products, corresponding certification marks and language descriptions will be marked according to the requirements of the destination country or region.
(II) Transportation
Transportation Methods
According to the transportation distance, quantity and customer requirements, different transportation methods can be selected. Short - distance transportation can use automobile transportation, which has high flexibility and can directly deliver goods to the customer's designated location, suitable for small - batch and urgent orders. Long - distance transportation can choose railway transportation or waterway transportation. Railway transportation has large transportation capacity, fast speed and relatively low cost, suitable for transporting large batches of cables; waterway transportation has low cost but slow speed, suitable for large batches of goods that do not require high transportation time. For international orders, sea or air transportation can also be used. Sea transportation is suitable for large batches of goods, and air transportation is suitable for urgent small - batch orders.
Transportation Precautions
During transportation, it is necessary to ensure that the cable reel is placed stably to avoid 倾倒 and collision. For wooden reels, it is necessary to prevent them from being damped and damaged; for steel reels, attention should be paid to rust prevention. Transportation vehicles or means of transport should be kept clean and dry to avoid the cable being polluted and eroded by moisture. During loading and unloading, special hoisting equipment, such as cranes and forklifts, should be used. Rough loading and unloading are strictly prohibited to prevent the reel from being deformed or the cable from being damaged. During transportation, the cable should be protected from direct sunlight and rain. If necessary, a tarpaulin can be covered for protection. At the same time, traffic rules and relevant transportation regulations should be observed to ensure transportation safety.
Transportation Tracking
For goods transported over long distances and internationally, the company will provide transportation tracking services. Customers can query the transportation status of the goods through the logistics order number, and know the location of the goods and the estimated arrival time. If abnormal situations occur during transportation, such as traffic jams, bad weather, customs inspection, etc., the company will communicate with customers in a timely manner, explain the situation and negotiate solutions.
(III) Delivery
Delivery Process
After the customer places an order, the sales department will transmit the order information to the production department and the warehouse department. The production department organizes production according to the order requirements to ensure that the products are completed on time. After receiving the delivery notice, the warehouse department conducts outgoing inspection on the products, checks the specifications, quantity, packaging and other information of the products to ensure that they are consistent with the order. After passing the inspection, arrange transportation vehicles and go through the outgoing procedures. Before delivery, the delivery information (such as the name, specification, quantity, transportation method, logistics order number, etc. of the goods) will be notified to the customer to facilitate the customer to prepare for receipt.
Delivery Time
When the inventory is sufficient, for cables of conventional specifications, delivery is usually completed within 1 - 3 working days after receiving the order. For special specifications or large - batch orders, the production cycle will be relatively long. The specific delivery time will be determined through negotiation with the customer according to the production progress and will be fed back to the customer in a timely manner. In case of delivery delay caused by force majeure factors (such as natural disasters, epidemics, raw material shortages, etc.), the company will communicate with the customer in a timely manner, explain the reasons and negotiate a solution.
(IV) Samples
Sample Provision
To facilitate customers to understand the quality and performance of the products, the company can provide samples. Customers can put forward sample requirements to the sales department through telephone, email, online consultation, etc., specifying the specifications, quantity, and other information of the required samples. The sales department will arrange the preparation of samples according to the customer's needs.
Sample Fees
For samples of conventional specifications, the company usually provides them free of charge, but the customer needs to bear the transportation cost of the samples. For samples of special specifications or customized samples, due to high production costs, the company will charge a certain sample fee, and the specific fee depends on the specifications and quantity of the samples. After the customer places a batch order subsequently, the sample fee can be deducted from the payment.
Sample Delivery
After the samples are prepared, they will be delivered according to the address and requirements provided by the customer. The packaging of the samples is similar to that of the finished cables to ensure that they are not damaged during transportation. After delivery, the express order number and other information will be promptly informed to the customer to facilitate the customer to track the logistics status of the samples. At the same time, the company will arrange a special person to communicate with the customer to understand the customer's feedback on the samples and provide further services and support for the customer.
(V) After - sales Service
Quality Assurance
The company promises that all sold Thhn/Thwn Cables 4 AWG (21.5mm²) comply with relevant national standards and industry specifications, and the product quality guarantee period is 2 years. During the quality guarantee period, if the product has quality problems caused by non - man - made factors (such as aging of the insulation layer, conductor breakage, sheath damage, etc.), the company will provide free repair or replacement services for the customer.
After - sales Service Response
If customers encounter any problems during use, they can call the company's after - sales service hotline or contact the after - sales service department through other means at any time. After - sales service personnel will respond to the customer's needs within 2 hours, understand the specific situation of the problem, and provide professional solutions. For emergency problems, the company will arrange technical personnel to arrive at the site for processing within 24 hours.
Technical Support
The company has a professional technical team that can provide customers with comprehensive technical support. When customers select cables, technical personnel will provide appropriate selection suggestions according to the customer's actual needs and use environment. During the installation and use of the cable, if the customer encounters technical problems, technical personnel will provide guidance through telephone, video, etc., or provide technical services on - site to ensure that the customer can use the cable products correctly.
Return and Exchange Policy
If the product received by the customer is inconsistent with the order information, or the product has quality problems (confirmed by the company), and the product is unused and the packaging is intact, the customer can apply for a return or exchange within 7 days of receiving the product. The company will review the application within 3 working days of receipt. Once approved, arrangements will be made for the return or exchange, and the corresponding transportation costs will be borne by the company. For returns or exchanges due to reasons attributable to the customer (such as incorrect selection, over - ordering, etc.), the customer shall bear the round - trip transportation costs, and the product must remain intact and undamaged.
In conclusion, the Thhn/Thwn Cable 4 AWG (21.5mm²) has become an ideal choice for power transmission in industrial, commercial, civil and other fields due to its excellent specification parameters, wide range of characteristic uses, high - quality materials and styles, advanced production processes, and comprehensive general information services including packaging, transportation, delivery, samples and after - sales service. Whether it is for power distribution in small and medium - sized electrical systems or power support in outdoor temporary power supply scenarios, this cable can provide a safe, stable and efficient power transmission solution, offering reliable power guarantee for the development of various industries.
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