I. From the Perspective of the Product Itself
(1) Specification Parameters
The 50mm² customized copper core power cable for underwater use has rich and rigorous specification parameters, each of which is carefully designed to ensure its stable and safe operation in underwater environments.
In addition to the single-core cross-sectional area of 50mm² and long-term current-carrying capacity of 180-220A, the rated voltage of this cable is also clearly specified, usually in multiple levels such as 0.6/1kV and 10kV, which can be selected according to different underwater power transmission needs. For example, in the power supply of small underwater equipment, a rated voltage of 0.6/1kV is sufficient; while in the power transmission of large offshore oil and gas platforms, a rated voltage of 10kV or higher is required.
In terms of conductor DC resistance, at 20℃, the DC resistance per kilometer does not exceed 0.383Ω. This parameter ensures that the energy loss during current transmission is at a low level, improving the efficiency of power transmission.
The insulation thickness varies depending on the
Insulation Material. When cross-linked polyethylene (XLPE) is used as the insulation layer, the thickness is usually 3.0-4.0mm; when ethylene propylene rubber (EPR) is used, the thickness is about 3.5-4.5mm. Sufficient insulation thickness can effectively prevent current leakage, ensure the insulation performance of the cable, and maintain stability even in long-term underwater immersion environments.
The thickness of the sheath layer also differs due to different materials. The thickness of the high-density polyethylene (HDPE) sheath is generally 4.0-5.0mm, and the thickness of the polyurethane sheath is about 3.5-4.5mm. A thicker sheath layer not only provides good mechanical protection but also enhances the cable's water pressure resistance and corrosion resistance.
For cables with a steel wire armoring layer, the diameter of the steel wires in the armoring layer is usually 2.0-3.0mm, and the armoring pitch is 100-150mm. This parameter setting ensures that the armoring layer uniformly and tightly wraps around the outer layer of the cable, providing sufficient water pressure resistance, enabling the cable to work normally in a water pressure environment of more than 10MPa.
The overall outer diameter of the cable also changes due to different structures. The outer diameter of
Unarmored Cables is about 25-35mm, while that of
Armored Cables reaches 30-45mm. The size of the outer diameter affects the difficulty of laying the cable underwater and the space it occupies, and needs to be adjusted according to the specific laying environment during customization.
In addition, the cable has a wide operating temperature range and can operate normally in an environment of -40℃ to 70℃. Even in cold deep seas or near high-temperature underwater equipment, it can maintain stable performance. Its minimum bending radius is 12 times the cable outer diameter, ensuring that appropriate bending can be performed during laying without damaging the internal structure of the cable.
(2) Characteristic Applications
The 50mm² customized copper core power cable for underwater use, with its excellent performance and customization advantages, has distinctive applications in multiple underwater fields.
In the field of marine engineering, in addition to being used for power supply and equipment connection of offshore oil and gas platforms, it also plays an important role in the detection and maintenance of submarine pipelines. Submarine pipelines are in complex marine environments for a long time and are prone to corrosion, leakage and other problems, requiring professional detection equipment for regular inspection and maintenance. This cable can provide stable power support for these detection equipment, such as underwater robots and pipeline scanners, ensuring the smooth progress of detection work. At the same time, in the laying and maintenance of submarine cables, this cable can be used as an auxiliary cable to supply power to laying equipment and maintenance tools.
In the field of underwater exploration, in addition to providing power for submersibles and sonar systems, it is also indispensable in deep-sea mineral resource exploration. Deep-sea mineral resources are buried at a certain depth below the seabed, requiring large exploration equipment for drilling and sampling. These equipment require a large amount of power supply, and the 50mm² customized copper core power cable for underwater use can meet their needs, ensuring the continuous progress of exploration work. In addition, in underwater archaeological work, this cable can provide power for underwater lighting equipment, excavation equipment, etc., facilitating archaeologists to explore underwater relics.
In water conservancy projects, in addition to adapting to equipment such as gate hoists and underwater pump stations, it is also used in the safety monitoring of reservoir dams. The safety of reservoir dams is crucial, and various monitoring equipment, such as water level sensors and seepage monitors, need to be installed. These equipment need to work underwater for a long time, and this cable can provide them with stable power and data transmission channels, ensuring the timely and accurate transmission of monitoring data. At the same time, in river regulation projects, this cable can be used to supply power to underwater dredging equipment, dredgers, etc., helping to dredge and manage rivers.
In terms of municipal construction, in addition to power supply for lighting and drainage systems in cross-river tunnels, it is also widely used in underwater treatment equipment of urban sewage treatment plants. The underwater aeration equipment and mixing equipment of sewage treatment plants need to operate continuously. This cable can withstand the corrosion of sewage, provide reliable power for these equipment, and ensure the smooth progress of the sewage treatment process. In addition, in the construction of urban underwater cable tunnels, this cable can be used as the main cable to supply power to various equipment in the tunnel, ensuring the safe operation of the tunnel.
In the military field, this cable can be used for power supply of underwater military facilities, such as underwater bases and submarine supply stations. Its excellent water pressure resistance and corrosion resistance can adapt to the complex underwater environment where military facilities are located, ensuring the normal operation of military equipment. At the same time, in underwater weapon tests, this cable can provide power for test equipment, ensuring the smooth progress of the tests.
(3) Material and Style
The material selection and style design of the 50mm² customized copper core power cable for underwater use fully consider the particularity of the underwater environment, aiming to provide reliable power transmission guarantee.
The
Conductor Material is high-purity electrolytic copper with a purity of more than 99.9%. High-purity copper has excellent conductivity, which can minimize energy loss during current transmission and ensure that power can be efficiently transmitted to underwater equipment. At the same time, copper has good ductility and plasticity, which is convenient for processing into conductors of various specifications. Moreover, copper has high chemical stability and is not easy to be corroded in underwater environments, which can prolong the service life of the cable.
There are various material choices for the insulation layer, and cross-linked polyethylene (XLPE) and ethylene propylene rubber (EPR) are two commonly used ones. XLPE has excellent electrical properties, chemical corrosion resistance and temperature resistance. After special vulcanization treatment, its molecular structure is more stable, and it can maintain good insulation performance in long-term underwater immersion environments. EPR has good
Flexibility, aging resistance and water resistance, and is suitable for underwater scenarios with high requirements for cable flexibility, such as
Power Supply Cables for underwater robots.
The material of the sheath layer is selected according to different use environments. High-density polyethylene (HDPE) has high mechanical strength, corrosion resistance and weather resistance, and can resist the friction of underwater rocks, the attachment of marine organisms and ultraviolet radiation, making it suitable for most underwater environments. Polyurethane materials have better wear resistance, oil resistance and hydrolysis resistance, and perform better in underwater environments containing oil or chemicals, such as cables near offshore oil and gas platforms.
In terms of style, the cable has a variety of designs to meet different needs. Unarmored cables have good flexibility and are suitable for shallow water areas or scenarios with high requirements for cable bending, such as power supply lines for underwater robots. Armored cables have an additional steel wire armoring layer outside the sheath layer, which greatly enhances the cable's water pressure resistance and mechanical strength, and is suitable for deep water areas or environments with large mechanical impacts, such as deep-sea exploration and submarine engineering.
In addition, there are composite cables with optical fibers. This kind of cable combines power transmission and signal communication functions. While transmitting power, it can realize real-time data transmission between underwater equipment and the ground control center. For example, the monitoring system of offshore oil and gas platforms and the data analysis system of underwater exploration equipment are inseparable from this composite cable. The color of the cable is usually black or blue, both of which have good concealment underwater and can reduce interference to underwater organisms.
(4) Production Process
The production process of the 50mm² customized copper core power cable for underwater use is complex and delicate, and each link needs to be strictly controlled to ensure that the quality and performance of the product meet the requirements of the underwater environment.
The production of the conductor is the first step. High-purity electrolytic copper ingots are made into copper rods through high-temperature melting and continuous casting processes. The diameter of the copper rods is adjusted according to the specifications of the final conductor. Then, the copper rods are drawn into
Copper Wires with uniform diameter through a wire drawing machine for multiple times. During the wire drawing process, a special lubricant needs to be used to reduce the friction between the copper wires and the die and ensure the surface quality of the copper wires. Subsequently, multiple copper wires are twisted according to certain twisting rules to form a conductor. During twisting, it is necessary to ensure that the copper wires are closely combined to improve the conductivity and mechanical strength of the conductor. The twisted conductor needs to be annealed. By heating and heat preservation, the internal stress of the conductor is eliminated, and its flexibility and conductivity are improved.
The extrusion process of the insulation layer is crucial. According to the selected insulation material, XLPE or EPR particles are added to the extruder, heated and melted, and then uniformly extruded and coated on the outer layer of the conductor through a special die to form the insulation layer. During the extrusion process, it is necessary to accurately control the extrusion temperature, pressure and speed to ensure that the insulation layer has uniform thickness, smooth surface, and is closely attached to the conductor without defects such as bubbles and impurities. For the XLPE insulation layer, cross-linking treatment is also required, usually by dry cross-linking or warm water cross-linking, so that the XLPE molecules form a three-dimensional network structure, improving its temperature resistance and mechanical strength.
The extrusion of the sheath layer is similar to that of the insulation layer, but the process parameters need to be adjusted according to the characteristics of the sheath material. HDPE or polyurethane particles are added to the extruder, heated and melted, and then extruded and coated on the outer layer of the insulation layer or armoring layer. If it is an armored cable, the armoring process needs to be carried out before extruding the sheath layer. During armoring, the steel wires are wound around the outer layer of the insulation layer according to a certain pitch and direction. During winding, the tension of the steel wires should be kept uniform to ensure that the armoring layer is tight and firm. After the armoring is completed, the sheath layer is extruded, so that the steel wire armoring layer is completely wrapped inside the sheath to form a whole.
For composite cables with optical fibers, optical fiber laying and protection are also required during the production process. The optical fibers are twisted together with the
Copper Conductors, or a special optical fiber channel is set between the insulation layer and the sheath layer. The laying of optical fibers should avoid excessive bending and stretching to ensure their transmission performance. When extruding the sheath layer, care should be taken to protect the optical fibers from damage.
Quality inspection runs through the entire production process. After the conductor is made, its diameter, resistance, mechanical properties and other parameters are tested; after the insulation layer is extruded, its thickness, voltage resistance, cross-linking degree and other parameters are tested; after the armoring and sheath layers are completed, the outer diameter, armoring density, mechanical properties and environmental resistance of the sheath are tested. In addition, the cable also needs to undergo overall water pressure testing, bending resistance testing and aging resistance testing to ensure that the cable can operate stably for a long time in underwater environments.
Finally, the qualified cables are marked and cut, with the product model, specification, length, manufacturer and other information marked for user identification and traceability. The cut cables are coiled or looped according to the order requirements, waiting for delivery.
II. From the Perspective of General Product Information
(1) Packaging
The packaging design of the 50mm² customized copper core power cable for underwater use fully considers the special needs of the product during storage, transportation and handling, ensuring that the cable remains intact when it reaches the user.
For cables with longer lengths, large steel cable reels are usually used for packaging. Steel cable reels have the characteristics of high strength and high load-bearing capacity, and can withstand the weight of the cable and various external impacts during transportation. The diameter of the cable reel depends on the length and weight of the cable, generally between 1.5-3.0 meters, and the width of the reel is 0.8-1.5 meters. Both sides of the cable reel are equipped with solid baffles with a thickness of not less than 12mm, which can effectively prevent the cable from slipping off the reel during transportation and handling.
Before the cable is wound onto the cable reel, a thick layer of waterproof plastic film is wrapped around the outer layer of the cable. This film can effectively block moisture and humidity from entering the cable, protecting the insulation layer and sheath layer of the cable from moisture. For cables that need to be transported or stored for a long time in harsh environments, a layer of linen or woven bag is wrapped outside the waterproof plastic film. Linen and woven bags have certain wear resistance and tear resistance, which can further protect the cable from mechanical damage and ultraviolet radiation.
Detailed product information will be clearly marked on the cable reel, including product name, model specification, length, rated voltage, manufacturer, production date, implementation standard, license number, etc. This information is not only convenient for users to check and accept when receiving the goods, but also provides a basis for product quality traceability. At the same time, some eye-catching warning signs will be marked on the cable reel, such as "Do not invert", "Handle with care", "Moisture and sun protection", "Hoisting position", etc., to remind transportation and handling personnel to pay attention to correct operation methods and avoid cable damage caused by improper operation.
To facilitate the hoisting and handling of the cable, a high-strength steel shaft is installed at the central shaft hole of the cable reel. Both ends of the steel shaft are provided with hoisting rings. The strength of the hoisting rings has been strictly calculated and tested, and can bear the total weight of the cable reel and the cable. After packaging, the cable reel will be firmly fixed on the transport tool with steel wire ropes or steel belts to prevent rolling and displacement during transportation.
For short-length cables or samples, high-strength wooden boxes or cartons are usually used for packaging. Foam or soft materials are placed inside the wooden boxes and cartons as buffers to avoid collision and extrusion of the cable during transportation. Product information and warning signs are also marked on the packaging to ensure the safe transportation of the cable.
(2) Transportation
The transportation of the 50mm² customized copper core power cable for underwater use needs to follow strict norms and procedures to ensure the safety and quality of the cable during transportation.
In terms of transportation mode selection, road transportation, railway transportation, water transportation or air transportation can be adopted according to factors such as transportation distance, cable quantity and weight. For domestic short-distance transportation, road transportation is a commonly used method, usually using large trucks. The truck compartment needs to be flat, firm and equipped with necessary fixing devices. During transportation, routes with good road conditions should be chosen to avoid bumpy and rugged sections, so as to reduce the vibration and impact on the cable.
For long-distance transportation or large quantities of cables, railway transportation and water transportation are more economical and stable choices. Railway transportation uses special railway freight cars, which can provide large loading space and a stable transportation environment, suitable for long-distance and large quantities of cable transportation. Water transportation is suitable for cross-regional or transnational transportation, and the cable is transported to the destination by cargo ship. This transportation method has low cost but relatively long transportation time. When choosing water transportation, attention should be paid to the loading and fixing methods of the ship to ensure that the cable is not eroded by seawater and affected by wind and waves during transportation.
Air transportation is usually used for small quantities of cable transportation in emergency situations. Although the transportation speed is fast, the cost is high, and it is generally only used in special cases.
When loading cables, special hoisting equipment such as cranes and forklifts are needed. The hoisting process should be operated smoothly to avoid severe impact and collision on the cable reel. The cable reel should be placed upright on the transport tool and kept stable. A certain gap should be left between adjacent cable reels to avoid mutual extrusion and friction. For armored cables, special attention should be paid to protecting the armoring layer during loading to avoid damage.
During transportation, effective protection should be provided for the cable. When transporting in rainy or snowy days, the cable reel should be completely covered with waterproof canvas to prevent rainwater or snow from entering the cable and affecting the insulation performance of the cable. When transporting in high-temperature weather, avoid the cable being exposed to sunlight for a long time. Transportation can be chosen in the morning and evening, or the cable can be shaded to prevent the cable from accelerating aging due to high temperature. When transporting in cold weather, attention should be paid to the anti-freezing of the cable to avoid the cable becoming brittle at low temperatures, which affects its flexibility and mechanical properties.
During transportation, drivers or escorts should regularly check the fixing of the cable and the integrity of the packaging, and deal with problems in a timely manner. During transportation, sudden braking and sharp turns should be avoided to reduce the impact of inertial force on the cable. After arriving at the destination, special equipment should be used to unload the cable reel smoothly to avoid cable damage caused by rough handling.
(3) Delivery
The delivery process of the 50mm² customized copper core power cable for underwater use is rigorous and standardized, aiming to ensure that the products can be delivered to users in a timely and accurate manner to meet their usage needs.
After the user places an order, the sales team immediately enters the order details into the company's integrated management system, which automatically notifies the production planning department and the warehouse management team. The production planning department reviews the order specifications, such as cable length, core configuration, armoring requirements, and special material requests, and cross-references them with the production schedule to confirm the manufacturing timeline. If the cable requires customization—such as a unique fiber-optic integration or specialized sheath material—the R&D team may also be consulted to ensure technical feasibility.
Once production is completed and the cable passes all quality inspections, the warehouse management team takes over. They verify that the finished product matches the order requirements exactly, checking parameters like conductor gauge, insulation thickness, and armoring integrity. The cable is then packaged according to the specified standards, with all necessary documentation—including test certificates, material safety data sheets (MSDS), and installation guidelines—compiled and attached to the shipment.
To ensure timely delivery, the logistics coordination team selects the most suitable transportation method based on the destination, order urgency, and cable dimensions. For international shipments, they handle customs clearance documentation, including commercial invoices, packing lists, and certificates of origin, to prevent delays at border checkpoints. A tracking number is generated and shared with the customer, allowing them to monitor the shipment’s progress in real time through an online portal.
The sales team maintains regular communication with the customer throughout the delivery process, providing updates on production milestones, shipment dispatch, and estimated arrival times. If unforeseen delays occur—such as weather-related disruptions or logistical bottlenecks—the team promptly informs the customer and works with the logistics provider to implement contingency plans, such as rerouting the shipment or arranging expedited transport.
Upon delivery, the customer is asked to inspect the cable packaging for damage and verify the quantity and specifications against the delivery note. Any discrepancies or issues are documented and addressed immediately by the after-sales team to ensure customer satisfaction.
(4) Samples
Recognizing the importance of product validation for customers, the company offers a comprehensive sample service for the 50mm² customized copper core underwater power cable. This service allows customers to evaluate the cable’s performance, durability, and compatibility with their specific underwater applications before committing to a full order.
Customers can request samples through various channels, including the company website, email, or direct contact with a sales representative. The sample request form requires details such as the intended application (e.g., deep-sea exploration, freshwater dredging), operating conditions (water depth, temperature range, pressure), and specific customization needs (e.g., fiber-optic integration, specialized sheath material). This information helps the technical team tailor the sample to closely match the customer’s requirements.
Sample production follows the same rigorous processes as full-scale manufacturing. The conductor is made from high-purity electrolytic copper, insulated with either XLPE or EPR, and sheathed in HDPE or polyurethane, depending on the application. If armoring is specified, steel wires are woven around the insulation layer to simulate the mechanical protection of the final product. Samples typically range in length from 1 to 5 meters, providing sufficient material for testing purposes.
Each sample is accompanied by a detailed test report outlining its performance in key areas, such as dielectric strength, water pressure resistance, and temperature cycling. The report includes data from laboratory tests conducted in accordance with international standards, such as IEC 60502 (
Power Cables for rated voltages from 1 kV up to 30 kV) and IEEE 1590 (underwater
Electrical Cables), to validate the cable’s suitability for underwater use.
Samples are shipped via express courier to ensure prompt delivery, with the cost of production and shipping covered by the company for qualified customers. The sales team follows up with the customer after delivery to answer any questions about sample testing and provide technical support, such as guidance on conducting pressure tests or evaluating flexibility.
Feedback from customers on sample performance is actively sought and used to refine the final product specifications. If adjustments are needed—such as modifying the sheath material to enhance
Chemical Resistance or increasing the armoring density for deeper water applications—the technical team works with the customer to develop a revised sample, ensuring the final product meets their exact requirements.
(5) After-sales Service
The company’s commitment to customer satisfaction extends beyond delivery, with a dedicated after-sales service team providing comprehensive support for the 50mm² customized copper core underwater power cable throughout its lifecycle.
One of the key components of the after-sales service is the warranty program, which covers manufacturing defects and material failures for a period of 3 to 5 years, depending on the application. The warranty includes free replacement of defective cables and technical assistance to resolve installation or performance issues. To claim warranty service, customers provide a copy of the purchase invoice and a detailed description of the problem, along with photographs or test data if applicable. The after-sales team evaluates the claim and, if approved, arranges for a replacement cable to be shipped within 48 hours for urgent cases.
Technical support is available to customers during installation, commissioning, and operation. The team of experienced engineers can provide on-site assistance for complex installations, such as deep-sea cable laying or underwater junction box connections, ensuring compliance with safety standards and optimal performance. They also offer remote support via phone or video conference, guiding customers through troubleshooting steps for issues like insulation resistance drops or mechanical damage.
For customers seeking to extend the cable’s service life, the company offers maintenance and repair services. This includes periodic inspections to assess sheath integrity, armoring corrosion, and insulation performance, as well as repairs to minor damage—such as sheath punctures or wire breaks—using specialized underwater repair kits. The team can also provide recommendations for preventive maintenance, such as cleaning procedures to remove marine growth or UV protection measures for cables exposed to sunlight during storage.
The company maintains a comprehensive database of all cable shipments, including production batch numbers, test records, and customer feedback, enabling efficient traceability in the event of quality concerns. If a potential issue is identified—such as a material defect or performance inconsistency—the team proactively contacts affected customers to offer inspections, replacements, or upgrades, demonstrating their commitment to product quality and safety.
Customer feedback is actively solicited through post-purchase surveys and regular check-ins. This input is used to identify areas for improvement in product design, manufacturing processes, and service delivery, ensuring that the 50mm² customized copper core underwater power cable continues to meet evolving customer needs and industry standards.
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