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Engineered for high current carrying capacity, minimal mechanical impedance, and long-term subterranean durability
Balancing high impulse electrical conductivity, thermal flash withstand, and subsurface structural stability
Modern lightning protection systems (LPS) operate under severe dynamic loads where millisecond electrical discharges exceed tens to hundreds of kiloamperes (kA). In commercial infrastructure, utility grid operations, mission-critical data installations, and heavy industrial facilities, Bare Copper Stranded Wire remains the undisputed industry benchmark for lightning down-conductors and earth-termination networks. Fabricated from uninsulated, high-purity electrolytic tough pitch (ETP) or oxygen-free copper, concentric and rope-lay stranded configurations provide the unique balance of electrical capacity, electromagnetic skin-effect management, and high mechanical flexibility needed to route lightning surges directly into the ground without catastrophic thermal flashover or structural ruptures.
Superior I²t energy absorption capabilities that withstand instantaneous heat surges up to 20,000°C without mechanical degradation or conductor fusion.
Naturally high corrosion resistance in acidic, alkaline, and variable moisture subterranean soil environments, ensuring minimum 40+ year lifecycle operations.
Optimized multi-strand geometry reduces high-frequency surge impedance, mitigating inductive back-flashover across steep 10/350 µs waveform fronts.
Standard power frequencies (50/60 Hz) interact with conductors uniformly through their cross-sectional area. However, lightning strikes are steep, high-frequency impulse events characterized standardly by the 10/350 µs (direct strike) and 8/20 µs (induced surge) waveforms per IEC 62305 and UL 96 standards. At these transient rise times, the skin effect and proximity effect concentrate current density along the outer perimeter of the conductor. Bare stranded copper wire maximizes effective surface area while maintaining the bulk cross-section necessary to absorb tremendous specific energy without exceeding safe thermal boundaries.
| Characteristic | Bare Copper Stranded Conductor | Galvanized Steel Conductor | Aluminum Alloy Stranded Conductor |
|---|---|---|---|
| Electrical Conductivity (IACS) | ≥ 100% (High efficiency dissipation) | ~ 10% - 15% (Higher surge impedance) | ~ 61% (Requires larger cross-section) |
| Melting Point | 1,083°C (High thermal inertia) | 1,420°C - 1,500°C | 660°C (Low thermal safety margin) |
| Direct Burial Compatibility | Excellent in most soil matrices | Moderate (Vulnerable if zinc layer degrades) | Prohibited for direct soil burial |
| Mechanical Flexibility | High (Class 2 / Class B concentric lay) | Low / Rigid (Difficult routing) | High (Prone to creep under mechanical load) |
The global transition toward green energy infrastructure—notably multi-megawatt solar photovoltaic arrays, utility-scale wind farms, and battery energy storage systems (BESS)—has significantly amplified the technical requirements for earthing systems. Large-scale PV farms, spanning hundreds of hectares of open terrain, demand thousands of kilometers of bare copper stranded wire to interconnect foundation piers, tracker motors, transformer pads, and perimeter ground loops into an equipotential plane. Furthermore, next-generation wind turbines, with hub heights extending past 150 meters, deploy specialized soft-drawn copper stranded cables internally through the blade and tower core to ensure direct lightning attachment currents bypass sensitive composite nacelles and precision drivetrain components.
Critical deployment fields where reliability, high impulse capacity, and mechanical compliance are essential
1. Mission-Critical Data Centers & Cloud Infrastructure: In hyperscale computing facilities, lightning discharges cannot merely be safely carried away; step and touch potential gradients must be kept below strict limits to prevent destructive electromagnetic pulses (EMP) from coupling into signal trunks. Continuous bare copper stranded meshes (ring earth electrodes) deployed underneath the slab ensure immediate potential equalization.
2. High-Voltage Utility Substations: Substation ground grids are calculated to tolerate maximum symmetrical fault currents in conjunction with external lightning discharges. Bare copper conductors provide the high cross-sectional conductivity needed to sink these energies directly to ground rods without causing dangerous surface ground potential rises (GPR).
3. Petrochemical Processing & Flammable Refineries: Facilities categorized under hazardous zone classifications (ATEX / Class I Div 1) utilize stranded bare copper conductors to guarantee zero sparking across joints. Exothermically welded or high-compression copper connections preserve conductor continuity across extreme thermal swings.
Precision wire drawing, multi-layer bunching, and comprehensive international quality compliance
Zhejiang Xingma Co., Ltd. was established in 2019 and is located in Liushi, the capital of electrical appliances in China. It is an enterprise mainly engaged in metal products, wire and cable processing and sales; import and export of goods and technology. The company revolves around the construction of a modern enterprise mechanism and mass production of mechanical automation. The leading products include copper wire, copper braided wire, copper stranded wire, soft copper stranded wire, brush wire, carbon brush wire, soft connection series products, metal stamping parts and other products. Best-selling at home and abroad, deeply trusted and welcomed by customers.
Zhejiang Xingma Copper Industry Co., Ltd. has a factory building with a construction area of more than 10,000 square meters and more than 100 employees. It has more than 300 domestic top-level manufacturing machines, the main equipment is: dingtian wire drawing machine, fuchuan beam machine, pipe twisting machine, braiding machine, annealing furnace, middle drawing machine, automatic cutting machine, welding machine, air dryer, microscope hardness tester, automatic punching machine, 160-ton punching machine, wire dividing machine, flattening machine, large polishing machine, stamping parts cleaning machine, bench drill, packing machine, etc., with an annual production capacity of more than 2,000 tons.
Respect & Compliance: The company abides by the Universal Declaration of Human Rights and major United Nations conventions, respects human and labor rights, opposes discrimination and harassment, respects each other, and is brave and determined to achieve and surpass itself. Relying on the manufacturing industry and taking scientific and technological innovation as the concept, we will vigorously expand related industries and gradually develop and expand.
Passed ISO9001 quality system certification and ISO14001 environmental management system certification in 2020. In 2021, it won the star enterprise and excellent production enterprise. It is a member unit of Zhejiang Cable Accessories Industry Association and a member unit of China Forging Association.
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