Copper Ground Bars

Copper Ground Bars – Tinned and Bare Copper Earthing Bars for Electrical Panels and Substations

Copper ground bars are solid or drilled copper bus bars used as central earthing and grounding terminals in electrical panels, switchgear, distribution boards, substations, and data centers. Manufactured from high-conductivity electrolytic tough-pitch (ETP) copper (C11000) or oxygen-free copper (C10200), copper ground bars provide a low-resistance grounding reference point for connecting multiple equipment grounding conductors. Used extensively by electrical OEMs, EPC contractors, power utilities, and panel builders in the USA and globally, these bars comply with NEC, IEC, and UL grounding requirements.

Product Overview

Brass and Copper Parts manufactures copper ground bars as per IEC 60439, UL 508A, and customer-specific dimensional drawings. Ground bars are available in bare copper, tin-plated copper, and nickel-plated copper finishes. Standard configurations include pre-drilled, tapped, or plain bars with insulated standoff mounting kits. Copper ground bars serve as the bonding point for equipment grounding conductors (EGC), grounding electrode conductors (GEC), and equipotential bonding conductors in both AC and DC distribution systems.

Product Types and Variants

By Material and Finish

• Bare Copper Ground Bars (ETP C11000) – Standard high-conductivity, for indoor dry locations
• Tinned Copper Ground Bars – Electrotin or hot-dip tin plated, prevents tarnish and oxidation, enhances solderability and contact reliability
• Nickel-Plated Copper Ground Bars – For high-temperature and corrosive environment installations
• Silver-Plated Copper Ground Bars – Minimum contact resistance, high-current joints in power substations

By Configuration

• Plain (Undrilled) Copper Ground Bars – Cut-to-length, drilled on site to customer specification
• Pre-Drilled Copper Ground Bars – Holes on standard pitch for lugs, connectors, and grounding screws
• Tapped Copper Ground Bars – Pre-tapped holes (M6, M8, M10, M12, 1/4″-20, 3/8″-16) for bolted terminal connections
• Copper Main Earthing Bars (MEB) – Heavy-section bars for main earthing terminals in switchgear and substations
• DIN Rail Mounted Copper Ground Bars – Snap-fit onto standard 35mm DIN rail, for panel and control cabinet use
• Insulated Copper Ground Bars with Stand-offs – Supplied with green/yellow polyamide or polycarbonate mounting insulators

Key Features

• Minimum 99.9% pure copper – electrical conductivity 100% IACS (ETP C11000)
• Low impedance grounding path – reduces touch voltage and fault current impedance
• Tin plating available – prevents surface oxidation and maintains long-term contact integrity
• Available with pre-drilled, tapped, or combination hole patterns
• Insulated mounting kits (stand-offs, brackets) available as complete assemblies
• Custom lengths, widths, thicknesses, and hole patterns per drawing
• Complies with NEC Article 250 grounding requirements and IEC 60439 busbar standards
• Suitable for AC and DC grounding, earthing, and equipotential bonding systems

Technical Specifications

Raw Material Grades and International Equivalents

Applications in Industry

• Electrical Panels and MCC: Main earthing bar in motor control centers, power distribution boards, and low-voltage switchgear
• Power Substations: Equipment grounding bus, transformer neutral earthing bars, control building earth grid connection
• Data Centers: Equipotential bonding bars, telecommunications bonding backbone (TBB) per TIA-607
• EPC and Industrial Plants: Instrument earthing bars, DCS/SCADA cabinet grounding, process plant bonding networks
• Renewable Energy: Solar inverter grounding bus, wind turbine nacelle earthing bars, battery energy storage systems (BESS) bonding
• Telecommunications: DSLAM cabinet grounding, telecom shelter bonding bars, antenna mast earthing

Manufacturing Process

Copper ground bars at Brass and Copper Parts are manufactured from ETP copper C11000 flat bar or rod stock conforming to ASTM B187. Flat bar is sheared or sawn to required length, followed by CNC drilling and tapping of terminal holes on precision jig fixtures. Edges are deburred and chamfered for safe handling. Tinning is applied by electrolytic or hot-dip process to 2–10 micron thickness. Insulated mounting kits are assembled and 100% continuity-tested before dispatch. Custom drawing-based production is available with DXF file input.

Quality Standards and Certifications

• ASTM B187 – Copper Bus Bar, Rod, and Shapes
• IEC 60439 / IEC 61439 – Low-Voltage Switchgear and Controlgear Assemblies
• UL 508A – Industrial Control Panels (grounding requirements)
• NEC Article 250 – Grounding and Bonding (USA)
• BS 7430 – Code of Practice for Protective Earthing of Electrical Installations
• TIA-607-C – Bonding and Grounding of Telecommunications Infrastructure
• RoHS 2 Directive Compliant
• ISO 9001:2015 Quality Management System

Why Choose Brass and Copper Parts

• Pure ETP copper (C11000) with certified conductivity – 100% IACS minimum
• In-house CNC drilling, tapping, and tin plating – complete manufactured assembly
• Custom hole patterns, lengths, and insulator kits per project drawings
• Export documentation and Mill Test Certificates for USA and European projects
• Proven supply to electrical OEMs, EPC contractors, and panel builders globally
• Competitive pricing with short lead times on standard and custom configurations

Frequently Asked Questions

What is a copper ground bar used for?

A copper ground bar serves as the central grounding terminal in an electrical panel or switchgear assembly. Multiple equipment grounding conductors are connected to it, creating a common low-resistance grounding reference. It also functions as the bonding bar for neutral-to-ground bonding at the main service entrance per NEC Article 250.

What copper grade is used for ground bars?

Standard copper ground bars are manufactured from ETP copper C11000 (99.9% pure, CW004A/C101), which provides 100% IACS electrical conductivity. For applications requiring zero oxygen porosity, oxygen-free copper C10200 (OFC/CW008A) is available.

What is the difference between a bare and tinned copper ground bar?

Bare copper ground bars are suitable for indoor, dry locations where tarnishing is acceptable. Tinned copper ground bars have a 2–10 micron tin coating that prevents oxidation, maintains stable contact resistance over time, and is required in humid, coastal, or corrosive environments.

What hole sizes and pitch are standard?

Standard hole diameters are 5.5mm (M5), 6.5mm (M6), 8.5mm (M8), 10.5mm (M10), and 13mm (M12). Standard pitch options are 15mm, 20mm, 25mm, and 30mm. Custom patterns are available based on customer drawings.

Do you supply insulated mounting kits?

Yes. We supply complete assemblies with polyamide (PA6.6) or polycarbonate insulated stand-offs and mounting brackets. Standoff heights of 10mm, 15mm, and 20mm are standard. Custom heights available.

What is the current-carrying capacity of copper ground bars?

Current-carrying capacity depends on cross-sectional area, installation conditions, and ambient temperature. As a guideline, a 25mm x 6mm bare copper bar carries approximately 200–250A continuously at 40°C ambient. Consult IEC 60439 or NEC 310 tables for precise derating per installation.

Can copper ground bars be used in outdoor or marine installations?

Tinned or nickel-plated copper ground bars are suitable for outdoor and marine applications. For submerged or high-chloride environments, additional protective measures or material upgrades may be required.

What lengths do you supply?

Standard lengths are 100mm to 2000mm. Cut-to-length service is available. Custom lengths per drawing are standard for project-specific orders.

Do you supply silver-plated copper ground bars?

Yes. Silver-plated copper ground bars are available for high-current substation busbars and joints where minimum contact resistance is critical. Silver plating thickness: 5–25 micron as specified.

What is the minimum order quantity?

Standard configurations are available from 10 pieces. Custom hole-pattern bars have project-based MOQs. Contact us for bulk project pricing.

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Request a Quote

Need copper ground bars in standard or custom configurations? Brass and Copper Parts supplies tinned and bare copper earthing bars to electrical OEMs, EPC contractors, panel builders, and power utilities across the USA and globally. Contact us for drawings-based quotations, technical datasheets, and competitive pricing.