Cables play a vital role in electrical systems, and choosing the right type is crucial for safety and efficiency. One commonly used type is unarmoured cable, which is widely used in indoor and low-risk applications. But what exactly is unarmoured cable, and how does it differ from other types? In this article, we’ll explore what unarmoured cable is, its advantages, applications, types, and installation guidelines.
What is Unarmoured Cable?
Unarmoured cable is a type of electrical cable without any protective metallic layer. Unlike armoured cables, which have an additional layer of steel or aluminum for mechanical protection, unarmoured cables rely on their insulation and outer sheath for safety. These cables are used in environments where mechanical damage is unlikely, making them ideal for indoor wiring, low-voltage systems, and flexible connections.
Key Features of Unarmoured Cable
Lightweight and Flexible
Unarmoured cables are lightweight and easier to handle, making them suitable for applications that require flexibility.
Cost-Effective
Since they lack an additional metallic protective layer, unarmoured cables are more affordable compared to armoured alternatives.
Easy to Install
Without a heavy protective layer, unarmoured cables are easier to cut, bend, and install, reducing labor costs and time.
Suitable for Low-Risk Environments
These cables are best used in areas where physical damage is minimal, such as indoor wiring, residential buildings, and control systems.
Variety of Insulation Options
Unarmoured cables come with different insulation materials, such as:
- PVC (Polyvinyl Chloride) – Used for general wiring and household applications.
- XLPE (Cross-Linked Polyethylene) – Provides better thermal resistance and durability.
- Rubber Insulated – Common in flexible and temporary installations.
Applications of Unarmoured Cable
Indoor Electrical Wiring
Unarmoured cables are widely used in residential and commercial buildings for power distribution.
Lighting Systems
These cables are used in lighting circuits, especially in homes, offices, and hotels.
Control and Instrumentation Wiring
Industries use unarmoured cables for control panels, instrumentation, and automation systems.
Telecommunication Networks
Unarmoured cables are used for low-voltage signal transmission, including telephone and data cables.
Temporary Installations
Due to their flexibility and ease of installation, they are ideal for temporary electrical setups at construction sites and events.
Types of Unarmoured Cable
Single-Core Unarmoured Cable
Used for simple electrical connections, such as wiring for appliances and power circuits.
Multi-Core Unarmoured Cable
Contains multiple conductors, making it suitable for complex electrical systems and industrial applications.
Low-Voltage Unarmoured Cable
Designed for applications below 1kV, commonly used in households and small commercial setups.
High-Temperature Unarmoured Cable
Specially designed to withstand extreme heat, commonly used in industrial furnaces and heat-sensitive environments.
Difference Between Armoured and Unarmoured Cable
| Feature | Armoured Cable | Unarmoured Cable |
| Protection | High (Metallic Armour) | Low (No Armour) |
| Weight | Heavy | Lightweight |
| Flexibility | Less Flexible | More Flexible |
| Cost | Expensive | Affordable |
| Usage | Harsh environments | Low-risk areas |
Advantages of Using Unarmoured Cable
Lower Cost
Since unarmoured cables do not have a protective metallic layer, they are cheaper than armoured cables.
Better Flexibility
Unarmoured cables are easy to bend and route, making them ideal for applications where space is limited.
Simplified Installation
Without extra layers, these cables reduce installation time and labor costs.
Ideal for Indoor Use
They work well in homes, offices, and buildings where mechanical damage is not a concern.
Disadvantages of Unarmoured Cable
Less Protection Against Physical Damage
Since these cables lack a metallic shield, they are more vulnerable to impact, crushing, or rodent damage.
Not Suitable for Underground Use
Unarmoured cables are not recommended for direct burial, as they lack the necessary protection against moisture and external forces.
Limited Outdoor Use
They require additional protective conduits if used outdoors, increasing costs.
How to Install Unarmoured Cable Safely
Choose the Right Cable Type
Select the appropriate voltage rating, insulation, and conductor size for your specific application.
Use Conduits for Added Protection
If installing unarmoured cables in exposed areas, run them through conduits to prevent damage.
Follow Proper Cable Routing
Avoid running cables near sharp objects, heat sources, or wet areas to extend their lifespan.
Ensure Secure Connections
Use proper cable glands and connectors to maintain a reliable electrical connection.
Regular Maintenance Checks
Inspect unarmoured cables for wear, damage, or insulation breakdown to prevent electrical failures.
Conclusion
Unarmoured cables are an essential component in modern electrical systems, offering affordability, flexibility, and ease of installation. While they lack the protective armor of their counterparts, they are perfect for indoor, low-risk environments such as residential wiring, lighting systems, and control applications.When used in the right conditions and installed properly, unarmoured cables provide a reliable and cost-effective solution for electrical connections.
FAQs
Can unarmoured cable be used outdoors?
Yes, but it should be installed in protective conduits to prevent damage from environmental factors.
Is unarmoured cable safe for underground installation?
No, it is not recommended for direct burial as it lacks mechanical protection against soil pressure and moisture.
What is the main advantage of unarmoured cable?
Its cost-effectiveness and flexibility make it ideal for indoor electrical wiring and control applications.
Can unarmoured cable carry high voltage?
Yes, but it is generally used for low to medium voltage applications, and high-voltage versions require extra insulation.
How can I protect unarmoured cable from damage?
Use cable trays, conduits, and proper installation practices to extend its lifespan and enhance safety.