Trefoil Clamps Manufacturer & Supplier in India
Description
Trefoil Clamps are manufactured using high-quality Nylon / HDPP material for secure clamping of single-core cables in trefoil formation. These clamps are suitable for indoor and outdoor installations on cable trays, racks, and trenches.
The product is UV resistant, eco-friendly, and designed for reliable performance in substations, thermal power stations, data centers, switchgear plants, and industrial installations. Trefoil clamps are tested and certified by ERDA with short circuit withstand capacity of 50 kA RMS / 125 kA Peak.
Technical Data
| Manufacturer | SG Power Products Pvt. Ltd. |
| Product | Trefoil Clamp |
| Model | TCSG019 |
| Suitable Cable OD | 19 mm (±2 mm) |
| Material | Nylon / HDPP |
| Shape | Standard / Triangular |
| Color | Black |
| Usage | General Stations, Sub Stations, Thermal Power Stations,Data Centers, Switchgears Plants, Industrial Installations,Terminal Kits, and Jointong Kits Etc. |
| Application | Indoor/Outdoor for vertical or horizontal running cables inside trenches, on racks / Cable Treys |
| UV Resistant | Yes |
| Eco Friendly | Yes |
| Working Temp. | 5°C to 70°C |
| Test Certification | ERDA (50 kA RMS / 125 kA peak) |
SG Power Products is a trefoil clamps manufacturer and trefoil clamp supplier in India, offering ERDA-tested trefoil clamps that hold three single-core cables in a tight triangular formation. Our trefoil cable clamps keep HT and LT cables secure on trays, racks and trench supports during normal running and short circuit faults. We supply in bulk to EPC contractors, utilities, substations and industrial plants across India.
Key Facts: SG Power Trefoil Clamps
Manufacturer: SG Power Products Pvt. Ltd., Noida, Uttar Pradesh, India.
Product: Trefoil clamps (trefoil cable cleats) for three single-core HT and LT cables.
Model: TCSG019, 19 mm, black nylon / HDPP.
Short circuit test: ERDA tested at 50 kA RMS / 125 kA peak.
Working temperature: 5 °C to 70 °C; UV resistant, for indoor and outdoor use.
Mounting: Cable trays, ladders, racks and trench supports, on vertical or horizontal runs.
Reference standard: IEC 61914
Supply: Bulk and project supply across India, with test documents for every dispatch.
Procurement Summary
| Parameter | Details |
|---|---|
| Product | Trefoil clamp (trefoil cable cleat) for single-core cables |
| Material | Nylon / HDPP; PVC and FRP |
| Model and size | TCSG019, 19 mm |
| Short circuit test | ERDA tested, 50 kA RMS / 125 kA peak |
| Working temperature | 5 °C to 70 °C |
| Finish | Black, UV resistant, for indoor and outdoor use |
| Mounting | Cable trays, ladders, racks and trench supports; vertical or horizontal runs |
| Minimum order | Bulk and project supply |
| Documents | Test certificate, datasheet and GA drawing on request |
| Supply | Across India, from Noida |
Table of Contents
- What Is a Trefoil Clamp?
- Types of Trefoil Clamps
- Our Range of Trefoil Clamps
- Trefoil Clamp Size Chart
- Which Trefoil Clamp Should You Use?
- Trefoil Clamp Price in India
- Technical Specifications
- How to Select a Trefoil Clamp
- Why Choose SG Power as Your Trefoil Clamps Manufacturer?
- Certifications and Testing
- Trefoil Clamp Supplier Across India
- How to Choose a Trefoil Clamps Manufacturer or Supplier
- Tender and BOQ Specification Text
- Commercial and Inspection Terms
- Applications by Industry
- Trefoil Clamp FAQs
- Related Products
- Request a Techno-Commercial Offer
What Is a Trefoil Clamp?
A trefoil clamp is a cable cleat that holds three single-core cables of a three-phase circuit together in a triangle, called trefoil formation. It fixes the cables to a tray, ladder or support so they stay in place under their own weight, thermal movement and the large electromagnetic forces of a short circuit.
Trefoil formation is used because it:
Keeps the three phases close together, which lowers reactance and induced sheath voltages.
Balances the magnetic field around the circuit and reduces heating in nearby metalwork.
Saves space on cable trays compared with flat spacing.
During a short circuit, the cables push each other apart with great force. A tested trefoil cable clamp stops them from breaking loose, damaging the insulation or injuring people nearby. The international standard for cable cleats is IEC 61914:2021.
Types of Trefoil Clamps
Trefoil clamps are grouped by material: nylon, HDPP, PVC and FRP polymer clamps, and aluminium or stainless steel metal cleats. Polymer clamps suit most HT and LT cables, while metal cleats are used for very high fault levels.
| Type | Material | Key properties | Typical use |
|---|---|---|---|
| Nylon trefoil clamp | Polyamide (nylon) | High strength, impact resistant, flame retardant, UV resistant | Power plants, substations, HT cable systems |
| HDPP trefoil clamp | High-density polypropylene | Light, tough, corrosion and chemical resistant | Industrial cable trays and trenches |
| PVC trefoil clamp | Rigid PVC | Low cost, good insulation, corrosion resistant | Commercial buildings and LT distribution |
| FRP trefoil clamp | Fibre-reinforced plastic | High load capacity, weatherproof, corrosion resistant | Coastal, chemical, oil and gas sites |
| Metal trefoil cleat | Aluminium or stainless steel | Very high short circuit ratings | Large HT and EHV cables (not made by SG Power) |
Non-metallic clamps are non-magnetic, so they do not form a closed magnetic loop around the cables and do not heat up from induced currents.
Our Range of Trefoil Clamps
| Model | Size | Material | Suitable cable outer diameter | Short circuit rating |
|---|---|---|---|---|
| TCSG019 | 19 mm | Nylon / HDPP | 19 mm (±2 mm) | 50 kA RMS / 125 kA peak (ERDA tested) |
All SG Power trefoil clamps are black, UV resistant and suitable for indoor and outdoor use, on vertical or horizontal cable runs. Each clamp is supplied with bolts, nuts and washers for mounting to the tray or support.
Trefoil Clamp Size Chart
Choose the trefoil clamp size whose diameter range covers your cable's outer diameter. Take the outer diameter from the cable datasheet, not the conductor size.
| Clamp size | Suitable cable outer diameter | Model |
|---|---|---|
| 19 mm | 19 mm (±2 mm) | TCSG019 |
| 25 mm | 25 mm (±2 mm) | TCSG025 |
| 35 mm | 35 mm (±2 mm) | TCSG035 |
| 42 mm | 42 mm (±2 mm) | TCSG042 |
| 50 mm | 50 mm (±2 mm) | TCSG050 |
| 58 mm | 58 mm (±2 mm) | TCSG058 |
| 65 mm | 65 mm (±2 mm) | TCSG065 |
| 75 mm | 75 mm (±2 mm) | TCSG075 |
| 100 mm | 100 mm (±2 mm) | TCSG0100 |
Which Trefoil Clamp Should You Use?
| Site condition | Recommended clamp |
|---|---|
| HT cables at a substation or power plant | ERDA-tested nylon trefoil clamp at the rated fault level |
| Outdoor cable trays in sun | UV-resistant nylon or HDPP clamp |
| Coastal or chemical plant | FRP or HDPP clamp |
| LT distribution in buildings | Nylon or PVC clamp |
| Fault level above 50 kA RMS | A clamp tested at the higher rating; ask our engineers |
Trefoil Clamp Price in India
A trefoil clamp in India typically costs Rs. 32 to Rs. 117 per piece, excluding GST, depending on material, size, short circuit rating, fasteners and order quantity. Indicative ex-works prices by type are below:
| Type | Size | Indicative price per piece |
|---|---|---|
| Nylon / HDPP trefoil clamp, TCSG019 | 19 mm | Rs. 32 to Rs. 117 (Contact SG Power for Latest Price) |
| PVC trefoil clamp | 19 mm to 68 mm | Rs. 35 to Rs. 40 (Contact SG Power for Latest Price) |
| FRP trefoil clamp | 19 mm to 68 mm | Rs. 45 to Rs. 49 (Contact SG Power for Latest Price) |
Prices are ex-works per piece and exclude GST. * Prices are indicative. For the latest price, contact SG Power.
Bulk project orders receive volume pricing. Send your cable outer diameter, fault level and quantity for a firm trefoil clamp price.
Technical Specifications
The SG Power TCSG019 trefoil clamp is a 19 mm, black, UV-resistant nylon / HDPP clamp for three single-core cables, ERDA tested at 50 kA RMS / 125 kA peak and rated for 5 °C to 70 °C.
| Parameter | Specification |
|---|---|
| Product | Trefoil clamp for three single-core cables |
| Model | TCSG019 |
| Material | Nylon / HDPP |
| Shape | Standard triangular (trefoil) |
| Colour | Black |
| Suitable cable outer diameter | 19 mm (±2 mm) |
| Short circuit withstand | 50 kA RMS / 125 kA peak, tested at ERDA |
| Working temperature | 5 °C to 70 °C |
| UV resistance | Yes |
| Flame retardance | UL 94 V-0 or V-2 |
| Halogen content | Halogen-free |
| Mounting | Tray, ladder, rack or trench support; vertical or horizontal |
| Fasteners | Bolts, nuts and washers |
| Reference standard | Designed to IEC 61914 |
How to Select a Trefoil Clamp
To select a trefoil clamp, match the clamp size to the cable outer diameter, check its tested short circuit rating against the system fault level, set the spacing from the test report and choose a material that suits the site. Follow these five steps:
Measure the cable outer diameter. Choose the clamp size whose range covers it, including any tolerance.
Find the fault level. Take the prospective short circuit current (kA RMS) and peak current at the cable location from the system study. Peak current is usually about 2.5 times the RMS value.
Check the clamp rating. The clamp's tested peak current must be equal to or above the system peak current.
Set the clamp spacing. The force between cables in trefoil is about F = 0.17 x ip² / S, where F is in N/m, ip is the peak current in kA and S is the distance between cable centres in m (equal to the cable diameter in trefoil). Use the spacing from the test report so the force per clamp stays within the tested value.
Match the environment. Use UV-resistant material outdoors and FRP or HDPP in corrosive areas.
Example:50 mm cables with a 125 kA peak fault give F = 0.17 x 125² / 0.05 = about 53,000 N/m. Clamp spacing must follow the tested spacing for this force, typically with intermediate straps between clamps.
Why Choose SG Power as Your Trefoil Clamps Manufacturer?
Short circuit tested: our trefoil clamps are tested at ERDA to 50 kA RMS / 125 kA peak, and the test report is shared with every offer.
Built for outdoor duty: black, UV-resistant material works from 5 °C to 70 °C on open trays and racks.
Non-magnetic design: polymer clamps do not heat up from induced currents around single-core cables.
Direct from the manufacturer: no traders in between, so pricing and dispatch are controlled at source.
Bulk project capacity: we supply large quantities to EPC contractors and utilities on fixed schedules.
Engineering support: our team helps you choose clamp size and spacing from your cable diameter and fault level.
One-source cable and earthing package: trefoil clamps, earthing strips, earthing electrodes and exothermic welding from one supplier.
Certifications and Testing
| Test or approval | Status |
|---|---|
| Short circuit withstand, 50 kA RMS / 125 kA peak | Tested at ERDA |
| Material test certificate | Supplied with each lot |
| Dimensional inspection | Routine, every lot |
| ISO 9001 quality management | Completed |
| Third-party inspection | Accepted at our works on request |
Trefoil Clamp Supplier Across India
SG Power supplies trefoil clamps from Noida to project sites across India, including Delhi, Gurugram, Faridabad, Ghaziabad, Mumbai, Pune, Ahmedabad, Bengaluru, Chennai, Hyderabad, Kolkata and Lucknow. Orders ship by road freight with packing lists and test documents for site inspection.
How to Choose a Trefoil Clamps Manufacturer or Supplier
Use this checklist when you compare trefoil clamp suppliers:
| Check | What to ask for | Why it matters |
|---|---|---|
| Short circuit test report | Report from a recognised lab such as ERDA or CPRI, with peak current, cable diameter and spacing | Untested clamps can break apart during a fault |
| Size range | Cable outer diameter range for each clamp size | A loose clamp lets cables move; a tight one damages the sheath |
| Material data | Material grade, UV resistance, flame retardance and temperature range | Outdoor and fire-risk areas need the right polymer |
| Tested spacing | Maximum clamp spacing at your fault level | Spacing decides how many clamps you need |
| Manufacturing source | Own factory, not a trader | Consistent quality and traceable lots |
| Documents | Datasheet, GA drawing, test certificates | Needed for consultant and client approval |
| Delivery capacity | Lead time for your full quantity | Cable laying schedules are tight |
Tender and BOQ Specification Text
Copy this text into your tender or bill of quantities and edit the values:
Supply of trefoil clamps for holding three single-core [XLPE] cables of [outer diameter] mm in trefoil formation on [cable tray / ladder / trench support]. Clamps shall be of black, UV-resistant [nylon / HDPP] material, suitable for 5 °C to 70 °C, and short circuit tested at a recognised laboratory for not less than [50] kA RMS / [125] kA peak. Supply shall include [stainless steel / galvanised] fasteners. The supplier shall submit the short circuit test report, datasheet and GA drawing for approval. Make: SG Power Products Pvt. Ltd. or approved equivalent.
Commercial and Inspection Terms
| Term | Details |
|---|---|
| Prices | Ex-works Noida, excluding GST and freight |
| Payment | 50% advance with purchase order, balance before dispatch |
| Lead time | 3 to 5 working days from advance, depending on quantity |
| Packing | Cartons with size and quantity marked |
| Inspection | At our works by the client or third party, on request |
| Documents | Test report, test certificate and packing list with each dispatch |
Applications by Industry
Trefoil clamps are used wherever single-core power cables run in three-phase circuits.
| Sector | Typical use |
|---|---|
| Substations and switchyards | HT single-core cables from transformers to switchgear |
| Thermal, hydro and solar power plants | Generator, transformer and inverter cable runs |
| Data centres | High-current LT feeders on trays and ladders |
| Switchgear and panel plants | Incoming and outgoing single-core cables |
| Steel, cement and process industries | Furnace, motor and plant feeders |
| Metro, railway and airport projects | Traction and station power cables in trenches and tunnels |
| Cable terminations and joints | Fixing cables near terminal and jointing kits |
Trefoil Clamp FAQs
Trefoil formation vs flat formation
| Feature | Trefoil formation | Flat formation |
|---|---|---|
| Layout | Three cables touching in a triangle | Three cables side by side |
| Reactance | Lower | Higher |
| Tray space | Less | More |
| Heat dissipation | Lower; may need derating | Better; higher current rating |
Request a Techno-Commercial Offer
Send us your requirement and our engineers will reply with a techno-commercial offer, the short circuit test report and the datasheet. Please include:
Cable outer diameter and number of circuits
Prospective fault level (kA RMS and peak)
Mounting (tray, ladder, rack or trench) and indoor or outdoor use
Quantity, site location and delivery schedule
Work directly with an experienced trefoil clamps manufacturer and supplier.