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High-purity bare stranded copper wires, flexible braided links, and stamping connectors designed to absorb high-frequency kilo-ampere surges without thermal degradation.
Lightning discharge is an extreme atmospheric event characterized by peak surge currents reaching anywhere from 30kA to over 200kA within microsecond rise times (standard 10/350 µs impulse waveform). In lightning protection systems (LPS) conforming to IEC 62305, UL 96, and NFPA 780, the down-conductor and earthing mesh must instantly conduct catastrophic energy loads directly to the earth without flashover, thermal blowout, or excessive mechanical stress.
Bare stranded copper wire stands as the ultimate material of choice across global heavy industrial, electrical utility, and commercial infrastructure due to its exceptional electrical conductivity (≥100% IACS), superior thermal capacity, and natural corrosion resistance. The multi-strand concentric or bunch-stranded construction offers critical advantages over solid conductors:
As modern infrastructure becomes densely populated with sensitive microelectronics, automated control systems, and renewable generation assets, the demand for high-integrity stranded copper earthing solutions is accelerating.
Multi-gigawatt utility solar PV arrays and high-altitude wind turbine blades face severe atmospheric exposure. Bare stranded copper wire ensures continuous equipotential bonding across vast tracker structures and sub-surface grounding rings to protect multi-million-dollar inverter and turbine assets.
Dense 5G base stations, remote telecom towers, and hyperscale data centers require grounding system impedance below 1 Ohm. Stranded copper conductors dissipate high-amplitude transient spikes, safeguarding high-frequency radios and sensitive fiber optic transceivers.
Ultra-fast DC charging depots (up to 480kW) and Battery Energy Storage Systems (BESS) require robust equipotential copper grids to prevent ground potential rise (GPR), ensuring complete human safety and fire mitigation during electrical faults.
Delivering high reliability, low impedance, and long-term durability in the most demanding physical and electrical environments worldwide.
Crucial for EV battery test facilities, high-voltage busbar grounding, robotic assembly plant earthing, and multi-dispenser EV charging depot surge networks.
Provides low-inductance down-conductors for broadcast towers, microwave communication towers, satellite ground stations, and data center earth rings.
Utilized in medium-to-high voltage power distribution substations, transformer neutral grounding, GIS switchgear bonding, and step-and-touch potential grids.
Protects hazardous, explosive chemical storage tanks, mining draglines, metallurgical smelting facilities, and offshore oil platforms against static sparks and lightning strikes.
Essential for wind turbine nacelle-to-ground grounding systems, utility-scale photovoltaic tracker bonding, and grid-scale BESS container safety earthing.
Zhejiang Xingma Co., Ltd. was established in 2019 and is located in Liushi, widely recognized as the electrical appliance capital of China. As an advanced manufacturing enterprise dedicated to high-precision metal products, wire and cable processing, and global supply chains, our company revolves around modernized enterprise mechanisms and continuous mechanical automation.
Operating from a modern production facility spanning over 10,000 square meters with a dedicated workforce of more than 100 skilled professionals, Zhejiang Xingma utilizes over 300 top-tier domestic manufacturing and testing machines. Key production and testing equipment includes: Dingtian wire drawing machines, Fuchuan beam machines, pipe twisting machines, precision braiding machines, continuous annealing furnaces, middle drawing machines, automatic cutting machines, welding machines, air dryers, microscope hardness testers, automatic stamping presses, 160-ton heavy stamping machines, wire dividing machines, flattening machines, large polishing equipment, stamping parts cleaning machines, bench drills, and automated packaging lines.
With an annual capacity exceeding 2,000 metric tons, our core portfolio spans copper wire, copper braided wire, copper stranded wire, soft copper stranded wire, brush wire, carbon brush wire, soft connection conductive links, and precision metal stamping parts. Certified under ISO9001 Quality Management and ISO14001 Environmental Management Systems, we are an active member unit of the Zhejiang Cable Accessories Industry Association and the China Forging Association.
Manufactured in strict adherence to international electrical and earthing standards including IEC 62305, UL 96, ASTM B8, and BS EN 50164 / 62561.
| Nominal Area (mm²) | Strand Construction (No. × mm) | Overall Diameter (mm) | Max DC Resistance @ 20°C (Ω/km) | Tensile Strength (N/mm²) | Standard Lightning Application |
|---|---|---|---|---|---|
| 25 mm² | 7 / 2.14 | 6.42 mm | 0.727 | 200 - 250 | Equipment Bonding & Internal Surge Links |
| 35 mm² | 7 / 2.52 | 7.56 mm | 0.524 | 200 - 250 | Secondary Down Conductors & Solar Frame Earth |
| 50 mm² | 19 / 1.78 | 8.90 mm | 0.387 | 200 - 250 | Class I/II LPS Down Conductors (Standard) |
| 70 mm² | 19 / 2.14 | 10.70 mm | 0.268 | 200 - 250 | Heavy Down Conductors & Substation Ground Meshes |
| 95 mm² | 19 / 2.52 | 12.60 mm | 0.193 | 200 - 250 | High-Keraunic Tower Earth Grids & Power Plants |
| 120 mm² | 37 / 2.03 | 14.21 mm | 0.153 | 200 - 250 | Utility Substation Main Ground Loop Ring |
Expert technical insights regarding material selection, soil resistance, stranding density, and installation best practices.
Bare stranded copper wire provides significantly greater mechanical flexibility, simplifying routing along intricate building contours, industrial structures, and structural rebar. Furthermore, stranded conductors deliver higher surface area to mitigate high-frequency surge impedance (skin effect) and withstand dynamic thermal whipping forces during transient lightning discharge without mechanical fatigue.
Electrolytic copper exhibits exceptional galvanic stability across neutral and moderately acidic soils. Unlike aluminum (which rapidly corrodes in soil and is prohibited by IEC 62305 for direct burial) or galvanized steel (which degrades once the zinc layer is depleted), bare copper maintains stable contact resistance and cathodic protection over an engineered lifecycle exceeding 30–50 years.
Under IEC 62305-3 and BS EN 62561, the international standard specifies a minimum cross-sectional area of 50 mm² for copper down-conductors (typically 19/1.78 or 7/3.00 configurations). In high-risk installations like petrochemical plants, power generation stations, or NFPA 780 Class II structures, cross sections of 70 mm² to 95 mm² are commonly deployed to withstand higher cumulative thermal loads (I²t).
Yes. With over 300 precision manufacturing units including multi-head drawing, bunching, tubular twisting, and continuous annealing furnaces, we produce customized strand diameters (0.05 mm to 3.5 mm), hard-drawn or soft-annealed tempers, specialized lay lengths, tinned coatings, and spooling options ranging from lightweight plastic reels to 1-ton wooden drums for automated deployment.
Manufactured by Zhejiang Xingma Copper Industry Co., Ltd. to the highest international quality and environmental standards.
