Introduction

STA (Steel Tape Armoured) cable is a type of power cable designed to provide enhanced mechanical protection through the application of steel tape armouring. It is commonly used in power distribution networks, industrial installations, and areas where the cable may be subjected to mechanical stress but requires a degree of flexibility.

Construction

• Conductor: Copper or aluminum conductor, typically stranded for flexibility.
• Insulation: Cross-linked polyethylene (XLPE) or polyvinyl chloride (PVC) for electrical insulation.
• Inner Sheath: PVC or other suitable material to bind the insulated conductors together.
• Armour: Two layers of steel tape applied helically over the inner sheath to provide mechanical protection.
• Outer Sheath: PVC or polyethylene to protect against environmental factors.

Technical Specifications

• Rated Voltage: Up to 35 kV
• Maximum Operating Temperature: 90°C
• Short-Circuit Temperature: 250°C (maximum 5 seconds)
• Minimum Installation Temperature: 0°C
• Minimum Bending Radius:
  • Single-core cables: 15 × overall diameter
  • Multi-core cables: 12 × overall diameter
• Standards: IEC 60502-1, BS 6346

Applications

STA cables are suitable for:

• Power distribution in industrial and residential buildings
• Underground installations where mechanical protection is required
• Outdoor installations with moderate mechanical stress
• Fixed installations in dry, moist, and wet environments

Advantages

• Mechanical Protection: Steel tape armour provides resistance against physical damage.
• Cost-Effective: Generally more economical than steel wire armoured (SWA) cables.
• Flexibility: More flexible than SWA cables, facilitating easier installation.
• Corrosion Resistance: Galvanized steel tape offers protection against corrosion.

Technical Data Table

Conclusion

STA (Steel Tape Armoured) cables offer a reliable and cost-effective solution for power distribution in environments where mechanical protection is necessary, but extreme mechanical stress is not anticipated. Their construction provides a balance between durability and flexibility, making them suitable for a variety of applications, including underground and outdoor installations. Compliance with international standards ensures safety and performance, making STA cables a preferred choice in many electrical installations.