Armouring

“Armoured” originates from the metal armour worn by ancient soldiers. The purpose of this armour was to protect the body from sword attacks, resist impact, and improve survivability in battle. Similarly, when a metal protective layer is added to the outside of a cable, it is like putting a “suit of armor” on the cable. Therefore, this type of cable is called an Armoured Cable.

Function of Armoured Cables

The purpose of adding a metal armor layer to a cable is not to improve its electrical conductivity, but to enhance its physical protection capability, such as resisting extrusion and impact, withstanding certain pressure, preventing rodent bites, and extending the service life of the cable.

Main Application

Armoured cables are mainly used in direct underground burial, outdoor power transmission and distribution, industrial plants, mining areas, construction sites, cable trenches, and other environments where cables may be exposed to mechanical damage. They are especially suitable for locations where there is a risk of compression, impact, or rodent attacks. 

Classification

The most common classification of armoured cables is based on the armour material: steel tape armoured(STA), steel wire armoured(SWA), and aluminium wire armoured(AWA). Each type has different applications:

1. Steel Tape Armoured Cable (STA)

Steel tape is wrapped around the cable as the armour layer.
The main purpose is to provide resistance to compression and external impact.
STA cables are suitable for direct underground burial and horizontal installations, and the cost is relatively lower.

2. Steel Wire Armoured Cable (SWA)

Round steel wires are used as the armour layer which increase high tensile strength of cables, making it suitable for vertical installations, cable shafts, and high-rise buildings. SWA cables are commonly used for three-core and multi-core cables.

3. Aluminium Wire Armoured Cable (AWA)

Aluminium wires are used as the armour layer. It is mainly used for single-core cables and suitable for AC power systems.It helps avoid magnetic losses.