Bronze Square Tape Clamps

Bronze Square Tape Clamps

Bronze square tape clamps — also called copper tape clamps, flat tape grounding clamps, or square tape connectors — are cast or machined bronze fittings designed to secure, bond, and terminate flat copper tape conductors in earthing grids, lightning protection systems, and equipotential bonding installations. Manufactured by Electrical Accessories India (Jamnagar) in silicon bronze (C65100) and gunmetal LG2 (CC491K), these clamps provide reliable long-term mechanical and electrical connections on copper tape sizes from 25 mm × 3 mm to 50 mm × 6 mm, complying with IS 3043, BS 7430, IEC 62305-3, and IEEE Std 80. The square-profile clamp body provides a rigid clamping geometry suited to flat tape — ensuring full-face conductor contact and minimal contact resistance at every joint.

Product Overview

Design and Clamping Geometry for Copper Tape

Bronze square tape clamps are purpose-designed for the flat profile of copper tape conductors, which cannot be reliably clamped by round conductor clamps. The clamp body features a rectangular (square-profile) internal channel that accepts the tape cross-section with a close dimensional fit — preventing the tape from rotating, twisting, or pulling out under installation or service loads. Two or more stainless steel or silicon bronze screws clamp a pressure plate against the top face of the tape, distributing clamping force uniformly across the full tape width. This design provides a contact area equivalent to the full tape cross-section, achieving very low contact resistance at the junction. Related terms: flat tape clamp, copper tape earth clamp, tape connector square body, copper strip grounding clamp, lightning tape clamp, flat conductor earthing clamp.

Material: Silicon Bronze and Gunmetal LG2

Square tape clamps are manufactured in silicon bronze (UNS C65100/C65500) and gunmetal LG2 (CC491K / IS 318), selected for corrosion resistance in the diverse environments where copper tape is installed — on building facades, buried in soil, in cable trenches, and on structural steelwork. Silicon bronze resists dezincification and stress-corrosion cracking, making it the preferred choice for coastal or chemical-plant environments. Gunmetal LG2 offers superior castability for complex clamp body geometries. Clamping screws are silicon bronze or SS316 for bi-metallic compatibility with the copper tape and bronze body. All materials are non-sparking and non-magnetic. Material conformance is verified by XRF spectroscopy on each casting batch. Relevant standards: ASTM B98, IS 318, BS EN 1982, ASTM B584.

Copper Tape Sizes and Clamp Range

Tape clamp bodies are sized to the standard copper tape cross-sections used in earthing and lightning protection systems. Standard tape sizes per IS 3043 and IEC 62305-3: 25×3 mm, 25×4 mm, 32×3 mm, 32×6 mm, 40×4 mm, 40×6 mm, 50×6 mm. The clamp channel width matches the tape width to ±0.3 mm, and channel depth accommodates the tape thickness with a small clearance for the pressure plate. Custom clamp bodies for non-standard tape sizes (e.g., 30×4 mm or 60×8 mm) are machined to customer drawing. Multiple tape cross-sections can be accommodated in a single clamp body on request (for tape-to-tape jointing variants). Related terms: 25×3 copper tape clamp, 40×4 tape earth clamp, 50×6 earthing tape clamp, flat copper strip connector.

Types of Connection Made by Square Tape Clamps

Bronze square tape clamps serve multiple connection functions in earthing and lightning protection systems: (1) Straight splice joints — joining two lengths of copper tape end-to-end in a ring earth conductor; (2) T-junction joints — branching a tap-off tape from a main tape ring conductor at 90°; (3) Tape-to-rod connections — bonding a copper tape down conductor to a copper-bonded earth rod terminal; (4) Tape-to-flat surface connections — bonding copper tape to structural steelwork, bus bars, or earthing terminals; (5) Tape fixing/saddle clamps — mechanically securing copper tape to a wall or structural surface without an electrical connection requirement (saddle type). Related terms: tape splice clamp, copper tape T-connector, copper tape to earth rod clamp, copper tape saddle clamp, tape bonding junction.

Electrical Performance and Contact Resistance

When torqued correctly, bronze square tape clamps achieve contact resistance well below 1 mΩ between the two conductors or between conductor and terminal. This is verified by current cycle testing per IEC 62561-4 principles. The clamp is rated for the full short-circuit withstand of the copper tape cross-section — a 50×6 mm copper tape (300 mm²) carries a prospective fault current of approximately 80–100 kA·s^0.5, and the clamp joint must not fail thermally or mechanically under this load. Bronze clamps with proper contact face preparation easily meet this requirement. Related terms: joint resistance, thermal withstand current, short-circuit rating, copper tape fault current capacity.

Installation on Surface and Buried Applications

Square tape clamps are installed either above-ground (on building facades, cable tray structures, transformer earthing connections) or buried (ring earth conductor junctions in substation earth grids). For buried applications, silicon bronze or LG2 gunmetal is essential — brass tape clamps are not recommended for direct burial per BS 7430 and IEC 62305-3 guidelines. When installing above-ground on stainless steel or painted steel surfaces, a tinned copper shim between the bronze clamp and steel surface is recommended to prevent bi-metallic corrosion at the contact interface. Anti-seize compound on screw threads prevents galling in buried conditions. Related terms: buried tape connector, above-ground tape clamp, substation ring earth joint, building down conductor tape clamp.

Key Features

• Square-profile body matched to flat copper tape for full-face conductor contact
• Available in silicon bronze C65100/C65500 and gunmetal LG2 (CC491K)
• Tape sizes: 25×3 mm to 50×6 mm standard; custom sizes machined to drawing
• Clamping screws: silicon bronze or SS316 — 2 or 4 screws depending on tape width
• Connection types: straight splice, T-junction, tape-to-rod, tape-to-surface, saddle/fixing
• Suitable for surface-mounted and direct-buried installations
• Non-sparking, non-magnetic — ATEX Zone 1/2 compatible
• Compliant: IS 3043, BS 7430, IEC 62305-3, IEC 62561, IEEE Std 80
• Short-circuit withstand: rated to copper tape fault current capacity
• XRF material certification on each casting batch

Material Grades and International Equivalents

Technical Specifications

Product Types and Variants

• Straight Splice Clamp: Two-piece body joining tape-to-tape in line; 2 or 4 screws
• T-Junction (Cross) Clamp: 90° branching clamp for ring/radial tape junctions
• Tape-to-Rod Clamp: Square tape channel + GUV-type rod seat combined in single body
• Tape Saddle (Fixing Clamp): Mechanical fixing to wall/structural surface, no electrical joint
• Tape-to-Busbar Clamp: Flat bottom face for bolting directly to copper or aluminium busbars
• Double Tape Clamp: Two-channel body for parallel tape conductors

Applications in Industry

• Lightning Protection Systems: Down conductor tape joints, ring conductor splices, and bonding connections per IEC 62305-3 / BS EN 62305-3
• Substation Earth Grids: Ring earth conductor splice and T-junction connections; tape-to-rod bonding per IS 3043 / IEEE Std 80
• Building Earthing (LV): Main earth conductor tape joints; structural steelwork bonding per BS 7671 / IS 732
• Transformer Earthing: Copper tape terminations at transformer neutral and body earthing terminals
• Industrial Plants: Earth ring conductor splice joints in cable tray earthing grids; static earthing bonding for process equipment
• Wind/Solar Farms: DC grounding copper tape connections, down conductor tape splices for wind turbine lightning protection
• Rail and Metro: Track earthing tape joints; overhead line structure bonding
• Petrochemical (ATEX): Non-sparking bronze tape clamps for Zone 1/2 static earthing and bonding connections

Manufacturing Process

1. Casting / Machining: Clamp body cast from silicon bronze or LG2 gunmetal; straight-splice and saddle variants also produced by CNC machining from bar stock
2. Fettling and Inspection: Flash removal, visual inspection for porosity and cold shuts
3. CNC Machining: Tape channel width and depth machined to ±0.2 mm; screw holes drilled and tapped
4. XRF Material Verification: Each casting lot verified against alloy specification
5. Dimensional Inspection: Channel width, depth, and screw hole positions checked per drawing
6. Contact Resistance Test: Sample batch testing at rated torque
7. Assembly: Screws, pressure plates, and washers assembled
8. Packing: Poly bag per clamp; bulk export carton with MTC and dimensional certificate

Quality Standards and Certifications

• IS 3043 – Code of Practice for Earthing (India)
• BS 7430 – Code of Practice for Protective Earthing (UK)
• IEC 62305-3 – Physical Damage and Life Hazard (Lightning Protection)
• IEC 62561-1 – Requirements for Connection Components (Lightning Protection)
• IEEE Std 80 – Guide for Safety in AC Substation Grounding
• ASTM B98 / BS EN 12163 – Silicon Bronze
• BS EN 1982 / IS 318 – Gunmetal LG2 Castings
• ISO 9001:2015 – Quality Management System

Why Choose Electrical Accessories India

• Dedicated tape clamp product range for all standard copper tape sizes (25×3 to 50×6 mm)
• In-house casting and CNC machining — tape channel machined to tape width ±0.2 mm
• All connection types: straight splice, T-junction, tape-to-rod, tape-to-busbar, saddle
• Both silicon bronze and LG2 gunmetal available for surface and buried applications
• Non-sparking materials — ATEX Zone 1/2 compliant hardware
• Custom tape sizes and special configurations machined to drawing within 2–3 weeks
• Export to 30+ countries with full MTC, XRF, dimensional, and RoHS documentation
• 30+ years manufacturing non-ferrous earthing hardware in Jamnagar, India

Frequently Asked Questions (FAQ)

What is a bronze square tape clamp used for?

A bronze square tape clamp is used to make a mechanical and electrical connection between two flat copper tape conductors (splice joint), or between a copper tape and another grounding component (earth rod, busbar, structural steel). It is widely used in lightning protection systems, substation earthing grids, and building equipotential bonding installations.

What copper tape sizes are compatible with your square tape clamps?

Standard sizes are 25×3 mm, 25×4 mm, 32×3 mm, 32×6 mm, 40×4 mm, 40×6 mm, and 50×6 mm. Custom tape channel sizes for non-standard dimensions are machined to drawing on request.

Why use bronze instead of brass for copper tape clamps?

Silicon bronze and LG2 gunmetal are preferred for buried and corrosive-environment installations because they resist dezincification and stress-corrosion cracking that can affect standard brass over time. For above-ground installations in mild environments, brass tape clamps may be acceptable — see our Brass Square Tape Clamps and Brass DC Clips product pages for the brass range.

Can the same clamp be used for both above-ground and buried applications?

Yes. Silicon bronze and LG2 gunmetal clamps are suitable for both surface-mounted and direct-buried applications. Brass clamps should not be used for direct burial in most soil conditions per BS 7430 and IEC 62305-3 guidance.

What screw material is used — silicon bronze or stainless steel?

Both are available. Silicon bronze screws are preferred for full bi-metallic compatibility in buried installations. SS316 screws are an alternative where additional mechanical strength is required. Specify your preference when ordering.

Do you supply T-junction tape clamps as well as straight splice clamps?

Yes. Our range includes straight splice, T-junction (cross), tape-to-rod, tape-to-busbar, and saddle clamp variants. Please specify connection type when requesting a quote.

What is the difference between a tape clamp and a DC clip?

A tape clamp (square clamp) is a bolted, permanent connection fitting providing full mechanical and electrical bonding. A DC clip is a spring-type or bolt-on clip used for light-duty or temporary tape fixing and connection applications. See our Brass DC Clips product page for details.

Can these clamps connect copper tape to a copper-bonded earth rod?

Yes. The tape-to-rod variant combines a square tape channel with a GUV-type rod seat in a single bronze casting, allowing direct connection of a flat copper tape to a 5/8″ or 3/4″ earth rod without an intermediate connector. Specify tape size and rod diameter when ordering this variant.

Equivalent Terms – Multilingual Reference

Related Products and Linked Terms

• Copper Bonded Earth Rods
• Bronze Ground Rod Clamps
• Bronze Copper Grounding Clamps
• Bronze Grounding Pipe Clamps
• Silicon Bronze Castings
• Bronze Transformer Ground Connectors
• Hotline Clamps of Bronze
• Brass Earth Blocks
• Earth Tags Brass
• Bronze Ground Rod Couplers

Request a Quote

To request pricing for bronze square tape clamps, specify: tape size (width × thickness in mm), connection type (straight splice / T-junction / tape-to-rod / saddle), material (silicon bronze or LG2 gunmetal), screw material, and quantity.

Contact us: Send your RFQ with tape dimensions and connection type. We respond within 24 business hours. Export to 30+ countries with complete documentation including MTCs and RoHS declarations.