HT cable (High Tension cable) is a critical component in medium to high voltage electrical systems, designed to carry large amounts of electricity over long distances or into heavy-load equipment. If you're in power distribution, industrial automation, or infrastructure development, understanding HT cables is essential for selecting the right product and ensuring safe, efficient energy transmission.
ht cable
What Is an HT Cable?
HT cables, short for High Tension cables, are designed to transmit electrical energy at voltages above 1.1 kV up to 33 kV. These cables are typically used in substations, power plants, factories, and underground distribution networks.
They are built with robust insulation and sheathing materials to withstand high electrical stress, environmental exposure, and mechanical wear.
HT Cable Construction
A standard HT cable consists of multiple layers, each engineered for safety, conductivity, and durability:
Conductor: Usually made of high-conductivity copper or aluminum
Insulation: Commonly XLPE (Cross-linked Polyethylene) or EPR, suitable for high voltage
Semiconducting layers: Ensure uniform electric field distribution
Metallic screen: Typically copper tape or wire for earthing and fault protection
Sheath/Jacket: Usually PVC, PE, or LSZH (Low Smoke Zero Halogen) for outer protection
Some HT cables also include armouring (like steel tape or wire) for added mechanical protection.
Types of HT Cables
Depending on the application, HT cables come in various configurations:
Single-core or multi-core
Unarmoured or armoured
PVC sheathed, XLPE insulated
With or without metallic screen
Voltage Ranges:
1.1 kV – 6.6 kV
11 kV
22 kV
33 kV
HT Cable Applications
HT cables are used across industries where high voltage power transmission is required:
Substations & power distribution networks
Industrial manufacturing plants
Mining and oil & gas operations
Renewable energy systems (wind, solar farms)
Infrastructure (metro rail, airports, smart cities)
HT Cable vs LT Cable: What’s the Difference?
| Feature | HT Cable | LT Cable |
|---|---|---|
| Voltage Rating | 1.1 kV to 33 kV | Up to 1.1 kV |
| Application | High-load, long-distance transmission | Domestic & small commercial loads |
| Insulation Type | XLPE, EPR | PVC, XLPE |
| Cost | Higher due to specs | Lower due to lighter construction |
HT Cable Standards
To ensure safety and performance, HT cables are manufactured according to national and international standards, including:
IEC 60502-2 – Power cables with extruded insulation for rated voltages from 6 kV to 30 kV
IS 7098 (Part II) – Indian standard for XLPE insulated HT cables
BS 6622 – British standard for medium voltage power cables
How to Choose the Right HT Cable
When selecting an HT cable, consider the following:
Voltage Rating (e.g. 11 kV, 22 kV, 33 kV)
Current Carrying Capacity – Match cable size to load
Installation Environment – Underground, duct, overhead?
Type of Conductor – Copper or aluminum?
Armouring Requirement – Based on mechanical risks
Sheathing and Insulation – XLPE for thermal and electrical resistance
Need help sizing the cable? Use our voltage drop calculator or consult our technical team for assistance.
HT Cable Price and Suppliers
At TOT Wire & Cable, we supply HT cables from 1.1 kV up to 33 kV, available in copper or aluminum, armoured or unarmoured. We offer competitive prices for both domestic and export markets. Custom lengths, certifications (like BIS, IEC), and delivery options available.
Conclusion
HT cables are essential for safe, high-efficiency transmission in medium and high voltage electrical systems. Whether for industrial use or power grid infrastructure, choosing the right HT cable ensures reliable performance, long service life, and regulatory compliance.
💡 Need a quotation or cable size recommendation?
Contact TOT Wire & Cable – your trusted source for high-performance HT cables.
