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Premium bare copper stranded wire solutions for electrical grounding and earthing, direct from our China factory.
Bare copper stranded wire is composed of multiple individual copper conductors twisted together without any insulating jacket or coating. This configuration delivers superior flexibility, excellent electrical conductivity, and outstanding resistance to corrosion — making it the industry's first choice for electrical grounding and earthing systems.
In grounding applications, the primary function of bare copper stranded wire is to provide a low-resistance fault current path from electrical equipment to the earth, ensuring that dangerous voltages are safely dissipated. Unlike solid copper wire, the stranded construction allows the wire to flex without fatigue cracking, which is essential in dynamic industrial environments subject to vibration, thermal cycling, or mechanical movement.
The superior electrical conductivity of copper (approximately 58 MS/m) means that bare copper stranded wire minimizes resistive losses in grounding circuits, ensuring rapid fault clearance and robust protection for personnel, equipment, and infrastructure. With purity grades reaching T1 (≥99.95% Cu), our grounding wire meets or exceeds IEC, ASTM, and BS standards globally.
⚡ Key Fact: Bare copper stranded wire accounts for over 60% of all grounding conductor installations in commercial and industrial electrical systems worldwide — driven by its unmatched combination of conductivity, flexibility, and long service life exceeding 40 years in buried applications.
Six core technical advantages that make bare copper stranded wire the preferred grounding conductor across every industry sector.
High-purity T1 copper delivers conductivity up to 100% IACS, ensuring minimal impedance in grounding circuits and rapid fault current dissipation that protects both people and equipment.
Multi-strand construction allows the wire to bend, flex, and route around obstacles without fatigue cracking — critical for complex industrial installations and equipment with vibration exposure.
Bare copper naturally forms a stable patina layer in soil and atmospheric environments, providing decades of reliable service in direct-burial grounding rods, grid electrodes, and overhead earthing conductors.
Copper's high melting point (1,085°C) and excellent thermal conductivity ensure the grounding wire survives fault current surges without melting or degrading, maintaining system integrity under extreme conditions.
Available from 1.5mm² to 630mm² and beyond, bare copper stranded wire can be precisely specified for any grounding system — from residential earth electrodes to high-voltage substation grid earthing networks.
Copper is 100% recyclable without loss of performance. Choosing bare copper stranded wire supports circular economy goals and reduces the environmental footprint of electrical infrastructure projects.
Global demand for bare copper stranded wire in grounding and earthing applications is accelerating, driven by megatrends in energy, infrastructure, and digital technology.
The global shift to solar, wind, and battery storage is driving unprecedented demand for bare copper grounding wire. Every utility-scale solar farm requires extensive copper earthing grids to protect inverters, transformers, and personnel. The IEA projects over 4,500 GW of new renewable capacity by 2030, each gigawatt requiring kilometers of grounding conductors.
The explosive growth of electric vehicle charging networks — with over 40 million public chargers projected globally by 2030 — demands robust grounding systems at every installation point. Bare copper stranded wire is the mandated grounding conductor in IEC 61851 and NEC Article 625 compliant EV charging installations.
Hyperscale data centers and 5G base station deployments require precision earthing systems to protect sensitive electronics from static discharge, lightning transients, and EMI. Bare copper stranded wire grounding grids are now specified in TIA-942 and ANSI/TIA-607 standards for all critical ICT infrastructure.
Utility companies worldwide are upgrading transmission and distribution infrastructure to support smart grid technologies. These upgrades require comprehensive earthing upgrades at substations and switching stations, creating sustained demand for large cross-section bare copper stranded wire and copper tape grounding conductors.
As factories deploy more robots, CNC machines, and automated production lines, the risk of electrical interference and fault currents increases. Comprehensive equipment grounding using bare copper stranded wire is now a fundamental requirement in IEC 60204-1 compliant industrial machinery installations.
Regulators in the EU, North America, and Asia-Pacific are tightening electrical safety standards, mandating lower grounding resistance values and more robust earthing systems. This regulatory pressure is pushing specifiers toward higher-quality, larger cross-section bare copper stranded wire solutions from certified suppliers.
From automotive assembly plants to offshore wind farms — bare copper stranded wire provides the critical grounding foundation across every major industry.
A technical deep-dive into how bare copper stranded wire performs in the most demanding grounding and earthing environments.
High-voltage substations use bare copper stranded wire in buried earth grid networks (mesh earthing) designed to distribute fault currents safely across a large area. Cross-sections of 95mm² to 400mm² are standard, with the wire laid in trenches at 0.5–1m depth in a grid pattern. The bare copper surface bonds directly with the surrounding soil, minimizing contact resistance and ensuring touch/step voltage levels remain within IEC 61936-1 safety limits during fault events.
Utility-scale solar installations require comprehensive grounding of every module frame, mounting structure, combiner box, and inverter. Bare copper stranded wire (typically 35–95mm²) forms the backbone of the earthing network, connecting all metallic components to a central earth electrode system. In corrosive soil environments, tinned copper stranded wire variants are specified to extend service life beyond 30 years with minimal maintenance.
Modern lightning protection systems (LPS) per IEC 62305 require bare copper stranded wire (minimum 50mm²) for down conductors connecting air termination networks to earth termination systems. The flexibility of stranded wire simplifies installation on complex building facades, while the bare copper surface provides reliable bonding at all connection points. High-rise buildings, industrial plants, and critical infrastructure all rely on copper stranded wire LPS earthing conductors.
Electrified railway systems generate significant stray currents and traction return currents that must be carefully managed through robust earthing systems. Bare copper stranded wire is used extensively in rail bonding, signal equipment earthing, and overhead line structure grounding. The wire's flexibility accommodates track movement and thermal expansion, while its conductivity ensures effective stray current control to prevent electrolytic corrosion of buried infrastructure.
Offshore wind turbines, oil platforms, and marine vessels present extreme challenges for earthing systems due to the highly corrosive saltwater environment. Bare copper stranded wire with heavy tinning is the preferred solution, offering excellent corrosion resistance while maintaining full conductivity for equipment grounding, cathodic protection bonding, and lightning protection earthing in these demanding marine environments.
Critical ICT facilities require low-impedance, high-frequency earthing systems to protect sensitive electronics from ESD, lightning transients, and conducted EMI. Bare copper stranded wire forms the primary bonding conductor in TIA-607 compliant telecommunications bonding and grounding (TBB) systems. The stranded construction reduces high-frequency impedance compared to solid conductors, making it ideal for signal reference ground planes in server rooms and switching centers.
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 worldwide.
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.
Zhejiang Xingma Copper Industry Co., Ltd. — Your trusted bare copper stranded wire manufacturer and supplier in China.
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, with an annual production capacity of more than 2,000 tons.
Our advanced production equipment ensures every meter of bare copper stranded wire meets the strictest quality standards for electrical grounding and earthing applications — from raw copper rod drawing to final stranding, annealing, and dimensional inspection.
WELCOME TO LEARN ABOUT OUR ENTERPRISE — Zhejiang Xingma Copper Industry Co., Ltd.
The company abides by the Universal Declaration of Human Rights and major United Nations conventions, respects human and labor rights, opposes discrimination and harassment, and fosters a culture of mutual respect.
Relying on the manufacturing industry and taking scientific and technological innovation as the core concept, we continuously invest in R&D and advanced equipment to deliver superior bare copper grounding wire products.
ISO14001 certified environmental management ensures our copper wire manufacturing processes minimize environmental impact. We are committed to sustainable production and the responsible use of copper resources.
Explore our complete range of copper stranded wire and grounding solutions — factory direct from Zhejiang Xingma.
