What is the Difference between an Armoured Cable and an Unarmoured Cable?

Oct. 10, 2025

In electrical engineering and power distribution, selecting the right cable type is essential for ensuring safety, reliability, and long-term system performance. Two of the most commonly compared cable types are armoured cables and unarmoured cables. Although both serve to transmit electrical power or signals, their design, application scenarios, and protection levels differ significantly.

As a global wire and cable manufacturer, Zhuhai Cable offers a wide range of both armoured and unarmoured cable products, including SWA/STA armoured power cables, XLPE power cables, control cables, solar cables, and building wires. Understanding the distinction between these two categories can help engineers and buyers choose the right solution for their specific project needs.

What is the Difference between an Armoured Cable and an Unarmoured Cable?cid=14

Structural Differences

Armoured Cable

An armoured cable includes an additional mechanical protection layer. The armor typically comes in several forms:

SWA (Steel Wire Armour): Used mainly for low-voltage power distribution.
STA (Steel Tape Armour): Used for medium-voltage and underground installations.
Aluminum wire/tape armour: Used where magnetic interference needs to be minimized.

This armoured layer is wrapped over the insulation and sheath to protect the core conductors.

Unarmoured Cable

Unarmoured cables do not include a mechanical protection layer. They consist mainly of:

conductor
insulation (PVC, XLPE, etc.)
inner sheath / outer sheath

They are simpler in structure and lighter in weight.

Mechanical Protection

Armoured Cable:

Provides strong resistance against external forces
Resists crushing, impact, rodents, digging damage
Suitable for harsh environments, underground burial, industrial plants, and outdoor installations

Because Zhuhai Cable provides robust SWA/STA armoured power cables, these products are often used in construction, infrastructure, and heavy-duty industrial applications where durability is critical.

Unarmoured Cable:

Lacks mechanical reinforcement
Requires installation in protected environments
Typically run in cable trays, conduits, or indoor locations

Zhuhai Cable’s unarmoured XLPE and PVC power cables are widely used in residential buildings, commercial facilities, and general electrical wiring.

Flexibility and Weight

Armoured Cable

Heavier due to the metal armour layer
Less flexible
Slightly more difficult to install, especially in tight spaces

Unarmoured Cable

Lighter and easier to handle
More flexible
Faster installation and routing

Cost Differences

Armoured Cable

More expensive due to the armour material and more complex production
Higher installation cost because of weight and stiffness
But lower risk of mechanical damage reduces long-term failure costs

Unarmoured Cable

Lower initial cost
Lower transportation and installation costs
But may require additional protection systems (trays, conduits)

Application Scenarios

Where Armoured Cables Are Used

Suitable for environments with physical risks:

Underground or direct burial
Industrial areas with machinery
Outdoor environments
Power distribution networks
Renewable energy projects (e.g., solar farms)

Zhuhai Cable’s STA/SWA series, ranging up to 35 kV, are used in many international infrastructure and utility projects.

Where Unarmoured Cables Are Used

Best for protected environments:

Indoor wiring
Control systems
Residential and commercial buildings
Conduits and cable trays
Solar photovoltaic wiring (e.g., Zhuhai Cable’s PV solar cables)

Safety and Standards

Both armoured and unarmoured cables manufactured by Zhuhai Cable comply with major certifications such as:

CE
CCC
ISO 9001
IEC/BS/DIN applicable standards depending on cable type

Armoured cables provide enhanced mechanical safety, while unarmoured cables rely on installation conditions for protection.

Conclusion

The main difference between an armoured cable and an unarmoured cable lies in the presence of a protective metal armour layer.

Armoured cables offer superior mechanical protection and are ideal for harsh environments.
Unarmoured cables are lighter, more flexible, and more suitable for controlled indoor installations.

Both types serve essential roles depending on project requirements. With its comprehensive product lineup—from SWA/STA armoured cables to XLPE and solar unarmoured cables—Zhuhai Cable provides reliable solutions for global power, construction, and industrial applications.

Next: Copper Cable vs. Aluminum Cables: How to Choose?

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