1. Product-Specific Details
1.1 Specifications and Parameters
Wholesale YJV
Power Cables designed for construction applications come with precise specifications and parameters that ensure their reliable performance in demanding construction environments. These cables are available in 50mm², 70mm², 95mm², and 120mm² 3-core configurations, with a rated voltage of 0.6/1kV.
The voltage rating of 0.6/1kV indicates that the cable can safely handle a phase-to-earth voltage of 0.6kV and a phase-to-phase voltage of 1kV, which aligns perfectly with the low-voltage power distribution needs of most construction projects. This rating ensures compatibility with standard construction-site electrical systems, including temporary distribution boards and machinery power supplies.
The
Copper Conductors in these cables have high purity, typically 99.95% or higher, which guarantees excellent electrical conductivity. The cross-sectional areas of 50mm², 70mm², 95mm², and 120mm² determine their current-carrying capacities. Under normal operating conditions (ambient temperature of 30°C), a 50mm² conductor can carry approximately 130A, 70mm² up to 165A, 95mm² around 200A, and 120mm² as much as 230A. These capacities can vary slightly based on installation conditions; for example, in higher ambient temperatures (above 30°C), the current-carrying capacity may decrease by 5-10% to prevent overheating. When installed in well-ventilated cable trays, the capacity can remain stable or even increase marginally.
The XLPE insulation has a thickness that varies with conductor size to provide adequate electrical insulation. For 50mm² conductors, the insulation thickness is around 1.2mm; 70mm² conductors have 1.4mm insulation; 95mm² features 1.6mm; and 120mm² has 1.8mm insulation. This ensures that the insulation can withstand the electrical stress and prevent leakage current, even in the presence of moisture or dust common in construction sites. The XLPE insulation has a dielectric strength of at least 20kV/mm, which is crucial for maintaining reliable insulation performance.
The copper screening layer, which can be a copper tape or braid, has specific parameters to ensure effective EMI reduction. The copper tape typically has a thickness of 0.1mm-0.2mm, and the braid has a coverage rate of at least 85% to provide sufficient shielding. This screening layer also contributes to the cable's overall mechanical strength.
The outer sheath, usually made of PVC (polyvinyl chloride), has a thickness ranging from 1.8mm for 50mm² cables to 2.4mm for 120mm² cables. The
PVC Sheath has a tensile strength of at least 12MPa and an elongation at break of not less than 150%, ensuring
Flexibility and durability in harsh construction environments. The overall diameter of the cables increases with conductor size: 50mm² 3-core YJV cables have an overall diameter of approximately 25mm, 70mm² around 28mm, 95mm² about 32mm, and 120mm² around 36mm.
The minimum bending radius for these cables is 6 times the overall diameter for fixed installations and 12 times for flexible installations. For example, a 50mm² cable with an overall diameter of 25mm has a minimum bending radius of 150mm for fixed laying and 300mm for flexible use, allowing for easy routing around obstacles on construction sites.
1.2 Special Purpose
YJV
Power Cables in 50mm², 70mm², 95mm², and 120mm² 3-core configurations are specifically designed to serve various special purposes in construction applications, thanks to their unique combination of features.
In building construction sites, these cables are widely used for temporary power distribution. They connect the main power source to temporary distribution boards, which then supply electricity to various tools and equipment. The 50mm² cables are suitable for powering smaller tools such as drills, grinders, and lighting systems. For larger equipment like concrete mixers and small excavators,
70mm² Cables are often used. The 95mm² and 120mm² cables are reserved for heavy machinery, including large cranes, bulldozers, and tower cranes, which require high current to operate.
During the finishing phase of new buildings, these YJV cables are used to connect permanent electrical systems. They link the main distribution panel to sub-panels in different floors and areas, ensuring a reliable power supply to lighting, air conditioning, and other electrical fixtures. The 3-core design is ideal for three-phase permanent electrical systems, providing balanced power distribution.
In infrastructure projects such as road construction and bridge building, these cables play a vital role. They power temporary lighting along construction zones, ensuring safe working conditions during night shifts. They also supply power to asphalt mixers, road rollers, and other specialized equipment used in road construction. For bridge projects, the cables are used to power cranes and welding equipment needed for structural work.
Urban development projects, including the construction of parks, stadiums, and public facilities, also benefit from these YJV cables. They provide power to construction site offices, where computers, printers, and communication devices rely on a stable electricity supply. The copper screening in the cables prevents EMI from interfering with these sensitive devices, ensuring smooth communication and data processing on-site.
Another special purpose is in emergency power systems on construction sites. In case of a main power failure, backup generators use these YJV cables to supply electricity to critical equipment, such as pumps used to prevent flooding in foundations and emergency lighting. The durability and reliability of the cables ensure that the
Emergency Power Supply remains operational when needed most.
1.3 Materials and Styles
The materials used in YJV power cables are carefully selected to meet the demands of construction applications, and they come in various styles to suit different installation requirements.
The conductors are made of high-purity electrolytic copper, which offers excellent electrical conductivity. This ensures minimal energy loss during power transmission, which is crucial for efficient operation of construction equipment. The
Copper Conductors are stranded, consisting of multiple small
Copper Wires twisted together. This stranded design enhances the flexibility of the cables, making them easy to bend and install in tight spaces, such as around corners of buildings or through conduits. The stranding also improves the cable's resistance to fatigue, which is important in construction environments where the cable may be moved or repositioned multiple times.
XLPE (cross-linked polyethylene) is used as the
Insulation Material due to its superior properties. Compared to traditional
PVC Insulation, XLPE has better thermal stability, allowing it to operate at higher temperatures. This is essential in construction, where cables may be exposed to heat from machinery or direct sunlight. XLPE is also resistant to chemicals, oils, and moisture, ensuring that the insulation remains intact even when exposed to construction site contaminants. The cross-linking process gives XLPE a three-dimensional molecular structure, which enhances its mechanical strength and durability.
The copper screening layer is made of high-quality copper, which provides effective shielding against electromagnetic interference. Copper is chosen for its excellent electrical conductivity, which allows it to absorb and redirect EMI, preventing it from affecting sensitive equipment. The screening can be in the form of a tape or a braid. Copper tape is easy to apply and provides uniform coverage, while copper braid offers better flexibility and is more resistant to mechanical damage.
The outer sheath is typically made of PVC, a durable and cost-effective material. PVC provides good resistance to abrasion, impact, and moisture, protecting the inner components of the cable from damage in harsh construction environments. It is also flame-retardant, which is an important safety feature in case of fire. The PVC sheath is available in different colors, such as black or grey, to aid in identification and comply with industry standards.
In terms of styles, these YJV cables are available as 3-
Core Cables, which is the standard for three-phase power systems in construction. The cores are color-coded for easy identification: typically, brown, black, and grey for the phase conductors, and blue for the neutral conductor (if present, though in 3-core construction, the neutral may be omitted or combined with the earth). This color-coding ensures correct installation and prevents phase mismatches, which could damage equipment. The cables can also be customized with additional features, such as armouring, for applications where extra mechanical protection is needed, though the standard YJV style without armouring is sufficient for most construction scenarios.
1.4 Production Process
The production of YJV power cables involves a series of precise and controlled processes to ensure their quality and performance in construction applications.
The first step is the manufacturing of the copper conductors. High-purity copper rods are drawn through a series of dies to reduce their diameter and form thin wires. These wires are then stranded together using a stranding machine. The stranding process is done in a specific pattern to ensure that the conductor has the desired flexibility and current-carrying capacity. For example, a 50mm² conductor is made by stranding multiple 0.5mm diameter copper wires. The
Stranded Conductors are annealed to soften them, making them more flexible and easier to work with.
Next, the XLPE insulation is applied to each conductor. The insulation is extruded onto the conductors using an extrusion machine. The extrusion process involves melting the XLPE compound and forcing it through a die that shapes it around the conductor. The thickness of the insulation is carefully controlled during extrusion to meet the specified requirements for each conductor size. After extrusion, the
Insulated Conductors undergo a cross-linking process. This can be done using either chemical cross-linking or radiation cross-linking. In chemical cross-linking, the insulated conductors are heated in a vulcanization tube, which causes the cross-linking agents in the XLPE to react and form a three-dimensional molecular structure. In radiation cross-linking, the conductors are exposed to electron beams, which initiate the cross-linking process. Cross-linking enhances the thermal and mechanical properties of the XLPE insulation.
Once the three insulated conductors are ready, they are twisted together to form a 3-core cable core. This twisting process is done using a cabling machine, which ensures that the conductors are evenly spaced and twisted at a specific pitch. The twisting helps to reduce electromagnetic interference between the conductors and makes the cable more flexible.
After forming the 3-core cable core, the copper screening layer is applied. If using copper tape, it is wrapped around the cable core using a taping machine. The tape is overlapped to ensure complete coverage. For copper braid, a braiding machine is used to weave copper wires around the cable core, achieving the required coverage rate.
The final step is the extrusion of the outer PVC sheath. The cable core with the copper screening is passed through an extrusion machine, where molten PVC is extruded around it to form the outer sheath. The thickness of the sheath is controlled to meet the specified requirements for each cable size. The extruded cable is then cooled in a water bath to solidify the PVC sheath.
After production, the cables undergo a series of testing processes. Electrical tests include insulation resistance testing, voltage withstand testing, and continuity testing to ensure electrical performance. Mechanical tests, such as tensile strength and elongation tests on the sheath and insulation, are also conducted. Additionally, the cables are checked for dimensional accuracy, including conductor size, insulation thickness, and overall diameter. Only after passing all these tests are the cables ready for wholesale distribution to construction customers.
2. General Product Information
2.1 Packaging
The packaging of wholesale YJV power cables is designed to protect them during storage, transportation, and handling, ensuring they reach construction sites in optimal condition.
The cables are typically spooled onto large wooden or steel reels. Wooden reels are commonly used for smaller quantities or shorter lengths, while steel reels are preferred for larger quantities and longer lengths due to their higher strength. The reels have flanges to prevent the cable from slipping off during transportation and storage. The flanges are reinforced with metal rings to withstand the weight of the cable, which can be significant for larger sizes like 120mm².
Each reel is labeled with detailed information, including the cable type (YJV), conductor size, number of cores, voltage rating, length of the cable on the reel, batch number, production date, and compliance with relevant standards (such as IEC and GB). This information helps contractors and construction teams identify the correct cable for their specific needs.
The cable ends are sealed with heat-shrinkable caps to prevent moisture, dust, and debris from entering the cable core. This is particularly important for preserving the insulation properties of the XLPE, as any contamination could compromise its performance. The reels are wrapped with a layer of waterproof plastic film to provide additional protection against moisture, which is crucial for outdoor storage on construction sites.
For wholesale shipments, multiple reels are often stacked on pallets and secured with steel straps to prevent movement during transportation. The pallets are made of sturdy wood or plastic, ensuring they can withstand the weight of the reels. For international shipments, the reels are placed in wooden crates that meet ISPM 15 standards, which require heat treatment to prevent the spread of pests. This ensures compliance with international phytosanitary regulations and avoids delays in customs clearance.
2.2 Transportation
Transporting wholesale YJV power cables requires careful planning to ensure they arrive at construction sites in good condition, considering their size, weight, and sensitivity to damage.
For domestic transportation, trucks with flatbed or curtain-sided trailers are commonly used. The reels are loaded onto the trailers using forklifts or cranes, depending on their weight. They are positioned to distribute the weight evenly across the trailer, preventing overloading of any single axle. The reels are secured to the trailer using steel straps and wooden blocks. The steel straps are tightened around the reels and anchored to the trailer's bed to prevent movement during transit, even during sudden stops or turns. Wooden blocks are placed between the reels to prevent them from rubbing against each other, which could cause damage to the outer sheath.
For long-distance transportation or international shipments, sea freight is the most cost-effective option. The reels are loaded into shipping containers, which are either 20-foot or 40-foot in size. The reels are arranged in the container to maximize space utilization while ensuring stability. They are secured using dunnage bags, which are inflated to fill the gaps between the reels and prevent them from shifting during the voyage. Steel braces may also be used to further secure the reels to the container walls, especially for larger and heavier reels.
Air freight is used for urgent orders, but it is more expensive and is typically limited to smaller reels or shorter lengths of cable. The reels are packaged in lightweight but sturdy crates to meet airline weight restrictions. They are handled with care to avoid bending the cable beyond its minimum bending radius, which could damage the insulation or conductors.
During transportation, the cables must be protected from extreme temperatures. High temperatures can cause the PVC sheath to soften, while low temperatures can make it brittle. Therefore, transportation vehicles or containers should be equipped with temperature control systems if necessary, especially for shipments in extreme climate conditions. Additionally, the cables should be protected from direct sunlight, which can cause UV degradation of the PVC sheath over time.
2.3 Delivery
The delivery process of wholesale YJV power cables is designed to be efficient and reliable, ensuring that construction projects have a steady supply of cables to avoid delays.
When a wholesale order is placed, the supplier processes it and checks the availability of the requested cable sizes and lengths. If the cables are in stock, they are prepared for delivery within 1-3 business days. For custom orders, such as specific lengths or specialized packaging, the delivery time may be longer, typically 7-14 business days, depending on the production schedule.
The supplier works with reputable logistics companies to arrange delivery. For domestic deliveries, the estimated delivery time is usually 2-5 business days, depending on the distance from the supplier's warehouse to the construction site. For international deliveries, the time varies based on the destination country and the shipping method. Sea freight can take 2-6 weeks, while air freight takes 3-7 business days.
Customers are provided with a tracking number once the shipment is dispatched. This allows them to monitor the progress of their delivery online through the logistics company's website or mobile app. The tracking information includes details such as the current location of the shipment, estimated delivery date, and any delays or exceptions, enabling construction teams to plan for the arrival of the cables.
Upon delivery, the construction site representative is required to inspect the reels for any visible damage. This includes checking for dents or cracks in the reels, damage to the outer sheath of the cable, and intactness of the heat-shrinkable caps on the cable ends. If any damage is found, it should be reported to the supplier and the logistics company immediately. The supplier will then arrange for a replacement or repair, depending on the extent of the damage, to ensure the construction project is not disrupted.
2.4 Samples
Suppliers of wholesale YJV power cables often provide samples to construction companies and contractors to allow them to evaluate the product before placing large orders.
Samples are typically short lengths of the cable, ranging from 1 to 5 meters, depending on the customer's request. They include all the key features of the full-length cables, such as the 3-core configuration, copper conductors, XLPE insulation, copper screening, and PVC sheath. This allows customers to inspect the cable's construction, check the quality of the materials, and perform any necessary tests, such as measuring the conductor size, insulation thickness, and checking for continuity.
To request a sample, customers can contact the supplier's sales team via phone, email, or through their website. They need to specify the conductor size, number of cores, and any other specific requirements. Some suppliers may charge a nominal fee for the sample, which is often refundable if the customer places a subsequent order of a certain quantity.
The samples are shipped using express courier services, such as DHL, FedEx, or UPS, to ensure quick delivery. Domestic samples are usually delivered within 2-3 business days, while international samples take 5-7 business days. The samples are packaged in small boxes or tubes to protect them during transit, ensuring they arrive in good condition for evaluation.
Once the customer receives the sample, they can conduct tests to verify its compliance with their requirements and relevant standards. This helps build confidence in the product's quality and suitability for their construction projects, leading to more informed purchasing decisions.
2.5 After-sales Service
Suppliers of wholesale YJV power cables understand the critical role these products play in construction projects, so they offer comprehensive after-sales service to address any issues and ensure customer satisfaction.
Technical support is a cornerstone of after-sales service. A team of experienced engineers is available to assist customers with installation guidance, troubleshooting, and technical queries. For example, if a construction team encounters difficulties in routing the cable around complex structures or needs advice on termination methods, the technical team can provide step-by-step instructions or even visit the site for on-site support. They can also offer insights on maximizing the cable's performance, such as proper handling to avoid exceeding the minimum bending radius and maintaining appropriate spacing in cable trays for heat dissipation.
Warranty coverage is another key aspect. Most suppliers provide a warranty period of 1 to 5 years, depending on the cable type and application. The warranty covers defects in materials and workmanship, ensuring that any cable failing due to manufacturing issues is replaced or repaired free of charge. To claim the warranty, customers need to provide proof of purchase, details of the defect, and, in some cases, photos or samples of the damaged cable. The supplier’s quality control team will assess the claim and determine the appropriate solution, minimizing downtime for the construction project.
In cases where cables are damaged during installation or use (not covered by warranty), suppliers often offer repair services. This may involve cutting out the damaged section and splicing the remaining cable, ensuring it meets electrical and safety standards. For large-scale projects, suppliers can dispatch technicians to perform on-site repairs, saving time and reducing the need for complete cable replacement.
Training services are also available for construction teams and electrical contractors. Suppliers may organize workshops or online training sessions to educate users on proper cable handling, installation best practices, and safety precautions. These training programs help prevent accidental damage to the cables and ensure that they are installed in a way that maximizes their lifespan and performance. Topics covered include identifying cable specifications, using the correct tools for termination, and complying with relevant electrical codes and standards.
Feedback mechanisms are in place to continuously improve product quality and service. Suppliers actively seek input from customers regarding their experience with the cables, including performance in different construction environments, ease of installation, and any issues encountered. This feedback is used to refine manufacturing processes, adjust material specifications, or develop new features that better meet the needs of construction applications.
Additionally, suppliers maintain a stock of replacement parts and accessories, such as cable lugs, connectors, and heat-shrinkable sleeves, to support customers’ installation and maintenance needs. This ensures that construction teams can quickly obtain the necessary components to complete their work without delays.
In summary, the after-sales service for wholesale YJV power cables is designed to be proactive and customer-centric, providing technical support, warranty coverage, repair services, training, and access to replacement parts. This comprehensive support ensures that construction projects can proceed smoothly, with minimal disruptions due to cable-related issues, and helps build long-term trust between suppliers and customers.
Conclusion
Wholesale YJV 50mm², 70mm², 95mm², and 120mm² 3-
Core Copper XLPE Power Cables, rated 0.6/1kV, are essential components in construction applications, offering a combination of high performance, durability, and reliability. From their precise specifications and specialized uses to their careful production processes, these cables are engineered to meet the rigorous demands of construction sites, infrastructure projects, and building developments.
The product-specific details, including their electrical and mechanical parameters, highlight their suitability for various power distribution needs, from powering small tools to heavy machinery. The use of high-quality materials—such as high-purity copper conductors, XLPE insulation, copper screening, and PVC sheathing—ensures they can withstand the harsh conditions of construction environments, including exposure to moisture, dust, heat, and mechanical stress.
On the general product information front, the packaging, transportation, delivery, sample, and after-sales service processes are designed to ensure the cables reach customers in optimal condition and remain supported throughout their lifecycle. This attention to detail in every stage, from manufacturing to post-purchase support, makes these YJV cables a trusted choice for construction professionals seeking efficient, safe, and long-lasting power distribution solutions.
Whether used in temporary site setups, permanent building electrical systems, or large-scale infrastructure projects, these wholesale YJV power cables deliver consistent performance, contributing to the success and safety of construction projects worldwide.
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