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Explore our precision-engineered soft bare copper stranded wire products — fully customizable, factory-direct, and trusted by global buyers.
Soft bare copper stranded wire is a highly flexible electrical conductor composed of multiple fine copper strands twisted together, produced without any insulation or coating. The "soft" designation refers to the annealing process applied during manufacturing — heating the copper to relieve internal stress — which dramatically increases ductility and flexibility compared to hard-drawn copper wire.
This wire type is the gold standard for electrical grounding and earthing applications worldwide. Its bare copper surface ensures direct, low-resistance metal-to-metal contact with grounding electrodes, busbars, and earth rods — a critical requirement for effective fault current dissipation and lightning protection.
The stranded construction — as opposed to solid wire — provides superior flexibility, making it easy to route through conduits, around obstacles, and into tight connection points without risk of cracking or breaking. This is especially important in environments subject to vibration, thermal cycling, or mechanical movement.
Why engineers and procurement specialists worldwide specify soft bare copper stranded wire for grounding and earthing systems.
Pure copper (≥99.9% Cu) delivers the lowest possible resistivity — 1.72 × 10⁻⁸ Ω·m — ensuring rapid fault current dissipation and stable ground potential.
Multi-strand annealed construction allows tight bending radii and repeated flexing without conductor fatigue — essential for dynamic grounding applications.
High-purity copper forms a stable oxide layer that preserves conductivity over decades, even in direct-burial and outdoor earthing installations.
Rated for operation from -40°C to +200°C, suitable for arctic substations, desert solar farms, and industrial furnace grounding alike.
Available in AWG 4 to 1000 kcmil, 7 to 2000+ strands, various lay lengths and drum lengths — all parameters adjustable to project specifications.
Manufactured to ASTM B8, IEC 60228 Class 5, BS 6360, and GB/T 3956 standards — accepted by global utilities, EPC contractors, and inspection bodies.
Standard parameter ranges for soft bare copper stranded wire used in grounding and earthing systems. Custom specs available on request.
| Parameter | Standard Range | Custom Options |
|---|---|---|
| Conductor Material | Electrolytic Tough Pitch Copper (ETP), ≥99.9% Cu | Oxygen-Free Copper (OFC) available |
| Cross-Section Area | 1.5 mm² – 1000 mm² | Up to 2500 mm² upon request |
| Number of Strands | 7 / 19 / 37 / 61 / 91+ | Fine-strand (2000+) for ultra-flexible use |
| Strand Diameter | 0.1 mm – 2.5 mm | Micro-strand to heavy-gauge |
| Lay Length | 8–16× strand diameter | Adjustable per flex requirement |
| DC Resistance at 20°C | ≤0.0176 Ω·mm²/m | Per IEC 60228 / ASTM B8 |
| Tensile Strength | 200–250 N/mm² | High-strength alloy options |
| Temperature Rating | -40°C to +200°C | Special alloys for extreme environments |
| Drum/Reel Length | 50m – 5000m | Custom coil, spool, or cut lengths |
| Standards | ASTM B8, IEC 60228 Cl.5, GB/T 3956 | BS 6360, DIN VDE 0295 on request |
The demand for soft bare copper stranded wire in grounding and earthing applications is accelerating — driven by infrastructure electrification, renewable energy expansion, and tightening safety regulations worldwide.
As global solar PV and wind farm capacity surpasses 3,000 GW, each installation requires extensive earthing networks. Utility-scale solar parks alone consume thousands of meters of bare copper stranded wire per MW installed, creating unprecedented demand. The global earthing and grounding market is projected to exceed USD 6 billion by 2030.
Aging grid infrastructure in North America, Europe, and Asia is being upgraded with smart substations and digital protection systems — all requiring high-integrity grounding networks. IEC 61936 and IEEE Std 80 compliance mandates are driving procurement of certified soft bare copper stranded wire at scale.
The global rollout of electric vehicle (EV) fast-charging networks — with over 15 million public charge points projected by 2030 — demands robust grounding systems at every installation. Soft bare copper stranded wire is specified for DC fast charger earthing to prevent touch voltage hazards and ensure RCD protection effectiveness.
Hyperscale data centers and Industry 4.0 manufacturing facilities require ultra-low impedance grounding systems to protect sensitive electronic equipment from transient overvoltages. The shift to 5G infrastructure also drives demand for precision earthing in base station installations globally.
China accounts for over 50% of global copper wire and cable production. Leading manufacturers like Zhejiang Xingma Copper Industry Co., Ltd. supply soft bare copper stranded wire to buyers across Europe, Southeast Asia, the Middle East, and the Americas — offering competitive pricing, ISO-certified quality, and rapid lead times.
Next-generation grounding wire features ultra-fine stranding (2000+ strands) for robotic and dynamic earthing applications, as well as copper-clad aluminum (CCA) hybrids for weight-sensitive installations. Oxygen-free copper (OFC) grades are gaining traction in high-frequency EMI shielding and precision instrument grounding.
Soft bare copper stranded wire serves as the backbone of electrical safety systems across every major industry — from power generation to precision electronics.
High-voltage substations use large cross-section soft bare copper stranded wire (240–1000 mm²) for grid earthing mats, neutral grounding, and surge arrester connections. The wire must withstand short-circuit fault currents of tens of kiloamperes without thermal damage — a requirement met by properly sized copper conductors per IEEE Std 80 calculations.
Photovoltaic farms require comprehensive DC-side and AC-side grounding networks. Soft bare copper stranded wire is buried directly in soil as earth conductors, bonded to mounting structures, and connected to lightning protection systems. Its corrosion resistance ensures 25+ year service life matching solar panel warranties.
Modern high-rise buildings, hospitals, and data centers employ foundation earth electrodes (Ufer grounds) and equipotential bonding networks using soft bare copper stranded wire. IEC 60364 and NEC Article 250 specify minimum conductor sizes and installation methods to ensure occupant safety and equipment protection.
Rail traction systems generate significant stray currents and electromagnetic interference. Soft bare copper stranded wire provides the return current paths, rail bonding, and signal circuit earthing essential for safe train operation. High-speed rail projects in Asia and Europe specify IEC-compliant copper earthing conductors throughout.
Steel mills, mining operations, and chemical plants operate large motors, transformers, and switchgear in harsh environments. Robust grounding with soft bare copper stranded wire protects workers from step-and-touch voltage hazards and prevents equipment damage from ground faults in high-impedance systems.
Telecom towers, 5G base stations, and hyperscale data centers require single-point grounding systems (SPGS) with ultra-low impedance. Fine-strand soft bare copper wire provides the bonding conductors that eliminate ground loops, reduce EMI, and protect sensitive network equipment from lightning-induced surges.
5 years of manufacturing excellence — your trusted partner for soft bare copper stranded wire and precision copper products.
Founded in 2019 and headquartered in Liushi — China's renowned "Capital of Electrical Appliances" — Zhejiang Xingma Copper Industry Co., Ltd. is a specialized manufacturer of copper wire, copper braided wire, copper stranded wire, soft copper stranded wire, brush wire, carbon brush wire, soft connection products, and metal stamping parts.
The company operates a modern factory of over 10,000 square meters, staffed by 100+ skilled employees and equipped with more than 300 advanced manufacturing machines including wire drawing machines, beam machines, pipe twisting machines, braiding machines, annealing furnaces, automatic cutting machines, and precision testing instruments. Annual production capacity exceeds 2,000 tons.
The company abides by the Universal Declaration of Human Rights and major United Nations conventions, respects human and labor rights, and is committed to scientific and technological innovation. Passed ISO9001 quality system certification and ISO14001 environmental management system certification in 2020. In 2021, it won the Star Enterprise and Excellent Production Enterprise awards. Xingma is a member of the Zhejiang Cable Accessories Industry Association and the China Forging Association.
In an increasingly competitive global market, Xingma differentiates through a combination of material purity, manufacturing precision, and customer-centric flexibility. Every coil of soft bare copper stranded wire leaving the Liushi factory undergoes dimensional inspection, resistance testing, and surface quality checks before shipment.
Factory-direct pricing eliminates middleman margins, making Xingma's wire highly competitive for large project procurement. Full parameter customization — strand count, cross-section, lay length, reel size, and surface treatment — means engineers receive exactly what their design specifies, not a compromise.
With established export channels to Europe, Southeast Asia, the Middle East, and the Americas, Xingma provides reliable logistics, multilingual technical support, and compliance documentation (test reports, material certificates, ROHS declarations) required by international buyers.
Tell us your specifications — cross-section, strand count, length, and quantity — and our technical team will respond within 24 hours with a competitive factory-direct price.
Get a Free Quote Now →Discover our full range of copper conductors, braided wires, and flexible connectors — all engineered for electrical grounding and earthing excellence.
