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In the field of electrical engineering, steel tape armoured cable (STA cable) is one of the most commonly used types of power cables. It is designed to provide mechanical protection, durability, and resistance to external environmental factors, making it ideal for industrial and underground applications.
With the increasing demand for reliable power transmission systems, steel tape armoured cable has become essential in construction, power distribution, and infrastructure projects. This article will explore its definition, applications, restrictions, stripping techniques, and key considerations for its usage.
Steel tape armoured cable is a type of electrical cable reinforced with a layer of steel tape armour to protect it from mechanical damage. It is primarily used in environments where the cable might be subjected to mechanical stress or impact.
A standard steel tape armoured cable consists of the following layers:
Conductor – The core of the cable, made of copper or aluminum.
Insulation – Provides electrical isolation between conductors and prevents short circuits.
Inner Sheath – Covers the insulation and offers additional protection.
Steel Tape Armour – A protective layer made of galvanized steel tape to enhance mechanical strength.
Outer Sheath – A PVC or PE sheath that protects against environmental factors.
There are different types of steel tape armoured cables, including:
Low-voltage steel tape armoured cable (LV STA cable): Used for power distribution in buildings and industrial plants.
Medium-voltage steel tape armoured cable (MV STA cable): Suitable for underground and industrial applications.
High-voltage steel tape armoured cable (HV STA cable): Utilized for large-scale power transmission.
Steel tape armoured cable is widely used in various industries due to its durability and mechanical protection. Below are some key application areas:
Steel tape armoured cables are commonly used for underground power distribution because of their high resistance to mechanical stress and moisture. The steel tape armour protects the cable from external forces such as soil pressure and accidental digging.
Industries require reliable power transmission, and steel tape armoured cables are ideal for harsh industrial environments. These cables are used in factories, refineries, and chemical plants to ensure safe and efficient power distribution.
Large infrastructure projects, such as bridges, tunnels, and highways, require durable electrical wiring. Steel tape armoured cable is preferred in these applications due to its ability to withstand environmental wear and tear.
Power stations and substations use steel tape armoured cables to connect transformers, switchgear, and distribution systems. These cables provide mechanical protection and ensure stable power transmission.
In areas with extreme weather conditions, such as coastal regions, deserts, and mountainous terrains, steel tape armoured cable is used because of its resistance to external damage, corrosion, and UV exposure.
The mining and oil & gas sectors require cables that can endure harsh conditions. Steel tape armoured cables are used in these industries due to their robustness and ability to resist mechanical stress, flames, and chemical exposure.
Although steel tape armoured cable is highly durable, there are specific environments where it is not recommended due to its limitations.
Steel tape armoured cables are not suitable for applications requiring high flexibility, such as robotic arms, drag chains, or moving machinery, because the steel tape armour restricts bending.
For underwater or deep-sea applications, steel wire armoured cable (SWA cable) is preferred over steel tape armoured cable due to its higher tensile strength and better corrosion resistance.
Extreme heat environments, such as furnaces or steel mills, may degrade the outer sheath of steel tape armoured cables unless they are specifically designed for high-temperature resistance.
If the outer sheath of the cable is not UV-resistant, prolonged exposure to direct sunlight can lead to cracks and degradation of the cable insulation.
In areas with aggressive chemicals, the outer sheath of the steel tape armoured cable may deteriorate over time. In such cases, special chemical-resistant cables should be used.
Stripping steel tape armoured cable requires precision and the right tools to avoid damaging the inner conductors. Here is a step-by-step guide:
Cable stripping knife
Wire cutters
Insulation removal tool
Pliers
Measure and Mark the Cutting Point
Determine the length of the cable to be stripped and mark it with a marker.
Score the Outer Sheath
Use a cable stripping knife to carefully cut around the outer sheath, ensuring not to damage the underlying steel tape armour.
Remove the Outer Sheath
Peel off the outer sheath by applying slight pressure and pulling it away.
Cut the Steel Tape Armour
Use wire cutters to carefully cut along the length of the steel tape armour. Avoid cutting too deeply to prevent damaging the insulation.
Peel Off the Steel Tape
Carefully remove the steel tape armour by bending it slightly until it separates from the inner layers.
Strip the Inner Sheath
Use an insulation removal tool to strip the inner sheath, exposing the conductors.
Prepare the Conductors for Termination
Once the conductors are exposed, they can be connected to terminals or other electrical components.
Steel tape armoured cable is a robust and reliable solution for power distribution in various industrial and infrastructure applications. Its steel tape armour provides excellent mechanical protection, making it ideal for underground, industrial, and harsh environmental conditions. However, it is not suitable for highly flexible, marine, or extreme temperature applications.
Understanding how to strip and handle steel tape armoured cable properly ensures safe and efficient installation. With the growing demand for power transmission solutions, steel tape armoured cable continues to be a crucial component in modern electrical systems.
1. What is the difference between steel tape armoured cable and steel wire armoured cable?
Steel tape armoured cable (STA) provides mechanical protection with layers of steel tape, whereas steel wire armoured cable (SWA) uses steel wires, offering better flexibility and tensile strength, making SWA more suitable for underground and marine applications.
2. Can steel tape armoured cable be used outdoors?
Yes, but the outer sheath must be UV-resistant to prevent degradation from direct sunlight exposure.
3. How do I choose the right steel tape armoured cable?
Consider factors such as voltage rating, environmental conditions, mechanical stress, and installation requirements before selecting a steel tape armoured cable.
4. Is steel tape armoured cable fire-resistant?
Standard steel tape armoured cables are not inherently fire-resistant, but fire-resistant and flame-retardant versions are available for special applications.
5. Can steel tape armoured cable be buried directly underground?
Yes, steel tape armoured cables are designed for direct burial, offering protection against soil pressure and mechanical damage.