Bronze KUL Type Clamps – Bronze Bonding Clamps for Messenger Strand & Overhead Line Grounding
Cable Glands India manufactures bronze KUL type clamps, also sold as bronze bonding clamps, used for heavy-duty grounding and bonding in the electrical utility and telecommunications industries. The clamp connects smaller copper ground wires, commonly #6 AWG, to thick, galvanized overhead cables, messenger strands, guy wires, or ground rods. A bronze strap or bracket encircles the strand or rod and is secured by bronze bolts, with an integral lug or binding post to terminate the ground wire. Telecom, CATV, and electrical utility contractors specify bronze KUL type clamps for outdoor and aerial bonding connections because the bronze body resists galvanic corrosion against galvanized steel strand and withstands long-term weather exposure and line vibration.
Price: US$ 14.50 per kilogram | Custom pricing available for bulk and OEM orders
Product Overview
Function of a Bonding Clamp in Grounding Systems
A bonding clamp creates a mechanically secure, low-resistance electrical connection between a copper grounding conductor and a galvanized steel or aluminum messenger strand, guy wire, ground rod, or structural member that must be bonded to the pole or tower grounding system. The clamp strap wraps around the strand or rod and is tightened with bronze bolts until the contact face seats firmly against the metal surface, while the ground wire is secured under a separate lug or binding post.
Even Pressure Bracket Design
The curved strap distributes clamping force around the full strand or cable circumference, which is important on thin-gauge messenger strand where a concentrated point load could deform or nick the strand.
Bronze Construction for Outdoor and Aerial Installations
Cable Glands India casts KUL type and bonding clamp bodies from leaded red bronze and silicon bronze alloys selected for corrosion resistance and galvanic compatibility in outdoor, aerial, and coastal environments such as utility poles, transmission towers, and rooftop antenna structures, where the connection is exposed to weather and is rarely re-inspected after installation.
Messenger Strand and Overhead Cable Bonding
Telecom and CATV construction practices require the galvanized steel or aluminum messenger strand supporting aerial cable to be bonded to the pole grounding system at regular intervals. Bronze bonding clamps sized for common strand diameters provide the connection point specified for this bonding requirement.
Guy Wire, Anchor, and Structural Bonding
Beyond messenger strand, KUL type clamps bond guy wires, anchor rods, ground rods, and structural steel members, maintaining continuity across the pole or tower grounding network. Because bronze does not corrode when installed in direct contact with galvanized steel strand and bronze fasteners, the connection remains mechanically sound and electrically continuous for the working life of the pole or line.
Utility and Telecom Standard Bonding Point
The clamp provides a defined, accessible bonding point that satisfies utility and telecom bonding practices for connecting the grounding conductor to messenger strands, guy wires, and overhead grounding systems referenced in national electrical and utility construction standards.
Key Features
- Curved bronze strap or bracket design for even clamping pressure on messenger strand and overhead cable
- Bronze bolts and hardware for corrosion-free long-term outdoor service
- Integral lug or binding post for ground wire termination
- Single and double strap configurations for varying strand and cable diameters
- Suitable for messenger strand, guy wire, ground rod, and structural steel bonding
- Corrosion resistant and galvanically compatible where copper conductor contacts galvanized steel strand
- Wide conductor range accepted at the termination point, commonly #6 AWG copper ground wire
- Compact bracket profile suitable for pole-top and aerial installation
Technical Specifications
| Parameter | Typical Range / Value |
|---|---|
| Messenger strand / cable / rod diameter range | 3/16 in to 1 in (5 mm to 25 mm) |
| Conductor range | #14 AWG solid to 4/0 AWG stranded (commonly #6 AWG copper ground wire) |
| Strap configuration | Single or double strap |
| Body material | Leaded red bronze / silicon bronze |
| Fastener material | Bronze or silicon bronze bolts |
| Termination type | Set screw binding post or bolted lug |
| Finish | Natural bronze |
| Operating temperature | -40 degrees C to +105 degrees C |
Raw Material Grades
| Grade | Alloy Type | Key Properties |
|---|---|---|
| C83600 | Leaded red bronze | Good casting quality, conductivity, machinability |
| C84400 | Leaded semi-red bronze | Good pressure tightness, corrosion resistance |
| C65100 | Low silicon bronze | High strength fastener and strap material |
| C93200 | High leaded tin bronze | Good bearing and wear properties |
International Equivalent Standards
| Country / Standard Body | Equivalent Reference |
|---|---|
| USA – UL / ASTM | UL 467 (grounding and bonding equipment), ASTM B584 |
| India – IS | IS 3043 (earthing code reference for bonding clamps) |
| UK – BS | BS 951 (earthing clamps), BS EN 1982 |
| Europe – EN | EN 12164, EN 12165 (copper alloy bars and forgings) |
| IEC | IEC 62561-1 (bonding component testing reference) |
Product Types and Variants
| Type | Description | Typical Use |
|---|---|---|
| Single strap KUL clamp | One bronze strap, single lug termination | Messenger strand to ground wire bonding |
| Double strap KUL clamp | Two straps for larger diameter strand or cable bundle | Larger messenger strands, cable bundles |
| Bonding clamp with binding post | Set screw binding post termination | General utility equipment bonding |
| Ground rod bonding clamp | Bracket sized for round rod | Ground rod to down-lead conductor bonding |
| Heavy duty bonding clamp | Reinforced strap and larger fastener size | High-tension overhead lines, substation structures |
Applications in Industry
Telecom & CATV Messenger Strand Bonding
Bronze KUL type clamps bond galvanized steel or aluminum messenger strands to copper ground wires on telephone poles, utility poles, and aerial cable routes, connecting the strand to the pole ground at required intervals.
Electrical Utility Overhead Distribution
Utilities specify these clamps in substations, along overhead distribution lines, and on transformer grids, where long-term conductivity and resistance to wind-induced vibration are important.
Guy Wire and Anchor Bonding
KUL type clamps bond guy wires and anchor rods to the pole or tower grounding system, maintaining a continuous fault path from overhead structures to earth.
Industrial and Commercial Earthing
Manufacturing plants, solar farms, and commercial infrastructure use bonding clamps to connect grounding networks between structural steel, cable trays, and ground rods.
Data Center and Telecommunications Rack Bonding
Bonding clamps connect telecommunications equipment racks and cable trays to the common bonding network specified in telecom grounding standards.
Manufacturing Process
Cable Glands India casts KUL type and bonding clamp bodies using gravity die casting or sand casting depending on strap size and order volume, followed by CNC machining of the bolt bores, contact face, and lug or binding post feature. Straps are formed to the specified radius on dedicated bending fixtures to ensure consistent fit across a batch, and bronze fasteners are sourced or machined to matching corrosion resistance. Each clamp is assembled, function tested for strap closure and conductor clamping force, then dimensionally inspected and packed for dispatch.
Quality Standards and Certifications
| Standard / Certification | Scope |
|---|---|
| ISO 9001 | Quality management system certification |
| UL 467 | Reference performance basis for grounding and bonding equipment |
| BS 951 | Reference dimensional and performance basis for earthing clamps |
| IS 3043 | Indian earthing code reference for bonding hardware |
| RoHS | Restriction of hazardous substances compliance on request |
Why Choose Cable Glands India
- In-house bronze foundry and CNC machining for full process control
- Full range of strand, cable, and rod diameter coverage from a single supplier
- Bronze fasteners supplied with every clamp to avoid dissimilar metal issues
- Batch-wise material composition and contact-resistance test certificates
- Custom strap sizes and termination types on request
- Competitive per-kilogram pricing with volume and OEM discounts
Frequently Asked Questions
Q1: What is a KUL type clamp?
A KUL type clamp is a bracket-style bonding clamp that uses a curved strap to encircle a messenger strand, overhead cable, or ground rod, providing a bolted connection point for a grounding or bonding conductor.
Q2: What is a bronze bonding clamp used for?
It bonds galvanized steel or aluminum messenger strands, overhead cables, guy wires, or ground rods to a copper grounding conductor, as required by utility and telecom bonding practices.
Q3: What strand and cable sizes are supported?
Standard clamps cover messenger strand, cable, and rod diameters from about 3/16 inch to 1 inch, with custom sizes available on request.
Q4: Why use bronze instead of galvanized steel clamps?
Bronze avoids galvanic corrosion where copper ground wire contacts galvanized steel strand, and resists weathering in outdoor, aerial exposure without needing a sacrificial coating.
Q5: Are these clamps suitable for guy wire bonding?
Yes, KUL type clamps are commonly used to bond guy wires and anchors to the grounding system on utility poles.
Q6: What conductor sizes fit the termination?
The standard range is #14 AWG solid up to 4/0 AWG stranded, with #6 AWG copper ground wire being the most common size used in messenger strand bonding.
Q7: Are double strap versions available?
Yes, double strap clamps are available for larger messenger strands or cable bundles, or where additional mechanical security is required.
Q8: Can these clamps be used outdoors or in exposed overhead locations?
Yes, bronze construction is designed for continuous outdoor and overhead exposure, resisting weather and temperature cycling without additional protective coating.
Q9: Do you supply test certificates?
Yes, every batch is supplied with material composition, dimensional, and contact-resistance test certification on request.
Q10: What is the standard lead time?
Standard lead time is 4 to 6 weeks depending on quantity and configuration, with expedited options available.
International Equivalent Terms
| Language | Equivalent Terms |
|---|---|
| Spanish | Abrazadera de bronce para cable mensajero, Grapa de conexion a tierra |
| Russian | Bronzovyi zazhim dlya trosa-nositelya, Zazhim dlya vyravnivaniya potentsialov |
| French | Collier de mise a la terre en bronze pour cable porteur, Collier de liaison equipotentielle |
| Portuguese | Grampo de bronze para cabo mensageiro, Grampo de equipotencializacao |
| Italian | Morsetto in bronzo per fune portante, Morsetto di equipotenzialita |
Linked Parts and Related Terms
Bonding Clamp, Messenger Strand Clamp, Overhead Ground Wire Clamp, Guy Wire Bonding Clamp, Ground Rod Clamp, Bronze Vise Connector, Hotline Clamp, Equipotential Bonding Connector.
Related Products in this Category
- Hotline Clamps, Bronze Hotline Clamps
- Bronze Vise Connectors – Vise Clamps
- Hot Line Stirrup, Hotline Stirrup Bail Clamps
- Bronze Ground Rod Clamps – Acorn Clamps
Get a Quote – Bronze KUL Type Clamps
Ready to source bronze KUL type clamps or bonding clamps for messenger strand, overhead cable, or utility bonding applications? Our engineering team can recommend the correct strap size and termination type for your project.
Price: US$ 14.50 per kilogram | Custom pricing available for bulk and OEM orders
Email: sales@cableglandsindia.com
Phone / WhatsApp: +91-22-43449300
Website: www.cableglandsindia.com
Share your project specifications, required quantities, and preferred delivery timeline, and we will respond with a detailed quotation within one business day.