Conductor Material: The whole series uses high - purity Aluminum Conductors (aluminum content ≥ 99.7%), which are made into round solid conductors through a continuous extrusion process. Compared with Copper Conductors, Aluminum Conductors are more than 40% lighter, greatly reducing the hoisting cost during laying. To improve conductivity, the conductor surface is annealed, and the conductivity reaches 61% IACS (International Annealed Copper Standard). Although it is lower than 100% IACS of copper, performance compensation is achieved by increasing the cross - sectional area (the cross - sectional area of aluminum conductors is about 1.6 times that of Copper Conductors under the same current - carrying capacity).

Insulation Material: The three models adopt differentiated insulation designs. The PVC insulation of PP00 - a has good mechanical strength with a tensile strength of ≥ 12MPa; the XLPE insulation of Yavv has been irradiated and cross - linked, with an insulation resistance of ≥ 10¹⁴Ω·cm and excellent corona resistance; the EPR insulation of Nayy De Aluminio has a higher elastic modulus and an elongation at break of ≥ 300%, which is suitable for scenarios with frequent bending.

Sheath material: All adopt extruded sheath structures. PP00 - a and Yavv have gray PVC sheaths with a density of 1.35 - 1.45g/cm³ and an impact strength of ≥ 20kJ/m²; Nayy De Aluminio has a black weather - resistant PVC sheath with 2% carbon black masterbatch added, and the tensile strength retention rate after 168 - hour ultraviolet aging test is ≥ 80%. The surface of the sheath is printed with raised specification marks (such as "4X25mm² Yavv"), which is convenient for identification during installation.

Overall style: The cable has a circular structure and adopts a concentric cabling process. 4 conductors are stranded with a 120mm pitch, and polypropylene rope is filled in the gap to ensure roundness. The bending radius of the 4X6mm² specification is ≥ 6D (D is the outer diameter), and that of the 4X35mm² specification is ≥ 8D, which meets the bending requirements of most laying scenarios.

Conductor manufacturing: The "smelting - continuous casting - continuous rolling - wire drawing" integrated process is adopted. Aluminum ingots are removed from impurities such as iron and silicon in an 800℃ furnace (purity is increased to 99.7%), cast into Φ9.5mm aluminum rods by a continuous caster, and then gradually drawn into Aluminum Wires with corresponding diameters through 5 wire drawing dies (the diameter of 6mm² conductor is about 2.8mm, and that of 35mm² is about 6.7mm). Emulsion cooling is used during the wire drawing process to ensure that the surface finish of the conductor is Ra ≤ 0.8μm.

Insulation extrusion: Three - layer co - extrusion equipment is used to complete the insulation coating. Taking the Yavv model as an example, XLPE particles are dried at 120℃ for 4 hours and then added to the extruder. They are melted and plasticized at 180 - 200℃ and evenly coated on the conductor surface through a cross head. During the extrusion process, the insulation eccentricity is controlled within 5%. After extrusion, it is shaped in a warm water cooling tank to ensure that the thickness deviation of the insulation layer is ≤ ± 0.1mm.

Cabling process: 4 Insulated Conductors are stranded in the "S" direction on the cabling machine, and polypropylene rope (diameter 2 - 3mm) is filled to fill the gap. The stranding tension is controlled by a servo system, and the tension deviation of each conductor is ≤ 5% to avoid uneven stress on the conductor during laying. After cabling, a wrapping machine is used to wrap non - woven fabric tape to enhance structural stability.

Sheath extrusion: The sheath material is preheated at 150℃ and then added to the extruder. It is extruded at 170 - 190℃, and the outer diameter accuracy is controlled by a vacuum sizing sleeve (deviation ≤ ± 0.3mm). For the Nayy De Aluminio model, carbon black masterbatch is added during extrusion, and the color uniformity of the sheath is ensured by an online color mark detector. After extrusion, it is cooled to below 40℃ in a cold water tank, and then marked by an inkjet printer.

Quality inspection: Each batch of cables must pass 12 tests, such as conductor resistance test (using a double - arm bridge with an accuracy of ± 0.5%), insulation withstand voltage test (applying 2.5kV voltage for 1 minute without breakdown), and sheath tensile test (tensile strength ≥ 12MPa), and can leave the factory only after passing the tests.

Transportation mode: For short - distance transportation (within 500 kilometers), van trucks are preferred. Rubber pads are laid in the carriage to prevent sliding, and the loading capacity of each truck does not exceed 10 tons. For long - distance transportation, semi - trailers are used. Steel reel cables must be fixed on the carriage beams with steel wire ropes (at least 4 fixing points for each reel), and buffer cotton is filled in the gaps to avoid collision. Export transportation is selected according to the destination: 20 - foot containers are used for sea transportation (which can hold 20 - 25 steel reel cables), and only short - length cardboard reel packaging is accepted for air transportation (the weight of a single box is ≤ 30kg).

Transportation restrictions: The following situations must be avoided during transportation: ambient temperature exceeding 60℃ (such as a 暴晒 carriage in summer); contamination by oil and chemical liquids; severe vibration (acceleration exceeding 3g). When stacking steel reel cables, wooden frames (100mm in height) must be padded at the bottom, and inversion or side placement is prohibited.

Tracking management: Each batch of goods is equipped with a logistics tracking list, which records the transport vehicle information, real - time location (through GPS positioning) and ambient temperature (built - in temperature and humidity recorder). Customers can query the transportation status by entering the order number on the official website, and abnormal situations (such as excessive temperature and humidity) will automatically trigger SMS warnings.

Delivery process: After the customer places an order, the system automatically checks the inventory (the stock - up cycle of conventional specifications is ≤ 24 hours). When the inventory is sufficient, the warehouse completes picking and re - inspection (checking specifications and appearance) within 4 hours; customized specifications (such as special lengths) require a 72 - hour production cycle. After production, they can be delivered only after sampling inspection by the quality inspection department (pass rate ≥ 99.5%). A packing list is generated before delivery and synchronously uploaded to the customer's account.

Delivery time limit: Domestic orders are delivered within 48 hours by default (72 hours in remote areas) and use logistics partners such as SF Express and Debon. Urgent orders can choose the expedited service (20% additional fee) to achieve delivery within 12 hours and arrival within 24 hours. Export orders need to submit customs declaration materials 3 days in advance, and the sea transportation time is calculated according to the destination port (for example, it takes about 30 days to Europe).

Attached documents: The following documents are attached to each batch of goods: product certificate (including test report number), packing list (indicating the length of each reel), and value - added tax invoice (if needed). Export orders additionally provide commercial invoices, packing lists (in English) and certificates of origin. The documents are packed in waterproof envelopes and fixed on the side of the steel reel or the top of the cardboard reel.

Sample provision: Customers can apply for samples through the official website and customer service hotline, and need to indicate the required model, specification and purpose. Regular samples are 1 - meter - long cable sections (weight ≤ 0.5kg) and are provided free of charge (limited to 2 pieces per customer). Special samples (such as prefabricated cables with connectors) need to charge a cost fee (calculated according to the actual cost), which can be deducted from the payment after placing an order.

Sample delivery: Samples are sent out within 24 hours. Domestic samples are delivered by SF Express (arrival within 1 - 2 days), and international samples are delivered by DHL (arrival within 3 - 5 days). The sample packaging is marked with "Sample", with a product manual and a simplified version of the test report enclosed. A feedback form is provided with the sample, and customers can get a 50 - yuan coupon after filling it in and returning it.

Sample guarantee: Samples and bulk products come from the same production line, and their performance parameters are completely consistent. If customers find that the samples do not match the description, they can request re - delivery and the round - trip freight will be borne. Samples support 7 - day return and exchange without reason (need to be kept intact).

Quality guarantee policy: The product warranty period is 18 months after installation and acceptance (or 24 months after leaving the factory, whichever comes first). If there is non - man - made damage within the warranty period (such as natural cracking of the insulation layer and conductor oxidation and fracture), the same specification products will be replaced free of charge, and the round - trip freight will be borne.

Fault response: After the customer reports a fault, the customer service will respond within 30 minutes and initially judge the fault type through photos. For simple problems (such as loose connectors), online guidance is provided; for complex faults (such as insulation breakdown), technical personnel will be arranged to visit within 4 hours (arrival within 24 hours in urban areas and 48 hours in remote areas).

Return and exchange policy: If there are problems such as wrong specifications and appearance damage within 7 days after receipt, customers can apply for return and exchange. Customers need to provide photo evidence. After approval, re - delivery will be arranged within 24 hours, and the old products will be recycled by logistics (free of freight). For return and exchange due to non - quality problems, customers need to bear the round - trip freight and a 5% handling fee.

Value - added services: Free technical consultation (such as selection guidance and laying schemes) is provided, and the electronic version of "Cable Maintenance Manual" is regularly pushed. Customers with a purchase amount of ≥ 100,000 yuan can enjoy on - site inspection services once a year (including insulation resistance test and appearance inspection). Customer files are established, and regular return visits (once every 3 months) are conducted to understand the use situation.