By Jianyun Cable – Leading Manufacturer of High-Quality Electrical Cables

Steel wire armoured cable (SWA) remains one of the most reliable choices for power distribution in challenging environments. In 2026, with growing infrastructure demands, understanding what steel wire armoured cable is used for helps ensure safe and durable installations.

What is Steel Wire Armoured Cable?

Steel wire armoured cable is a low-voltage power cable featuring galvanized steel wire armouring over insulated conductors. Rated typically at 600/1000V, it provides robust mechanical protection while maintaining flexibility for mains electricity supply.

Unlike standard cables, SWA's armour layer shields against impact, crushing, and rodent damage, making steel wire armoured cable ideal for direct burial and exposed runs.

Construction of SWA Cable

The typical build of steel wire armoured cable includes:

• Stranded copper or aluminium conductors
• XLPE or PVC insulation
• PVC bedding for cushioning
• Galvanized steel wire armour
• PVC or LSZH outer sheath

This multi-layer design ensures steel wire armoured cable withstands harsh conditions while delivering reliable power.

Main Uses and Applications

Steel wire armoured cable is primarily used where mechanical protection is essential:

• Underground power distribution and direct burial installations
• Industrial plants, factories, and warehouses
• Outdoor lighting and street power supplies
• Construction sites and temporary power
• Railways, tunnels, and infrastructure projects

In these settings, steel wire armoured cable protects against digging accidents, heavy loads, and environmental stress.

Key Advantages

Choosing steel wire armoured cable offers several benefits:

• Excellent resistance to mechanical damage
• Suitable for direct burial without additional conduit
• Long service life in outdoor/exposed locations
• Armour can serve as circuit protective conductor (CPC)
• Available in LSZH for reduced smoke in fires

Safety Tips for Handling SWA Cable

Safety is paramount when working with steel wire armoured cable:

• Always isolate power before handling or terminating
• Use proper PPE including cut-resistant gloves
• Earth the armour correctly to prevent shock hazards
• Avoid using single-core SWA in AC circuits due to eddy currents
• Inspect for damage before installation

More safety guidance available in our blog post on Electric Cable Safety Tips.

Installation Best Practices

Proper installation maximizes the benefits of steel wire armoured cable:

• Bury at minimum 600mm depth with warning tape
• Use approved SWA glands for secure termination
• Respect minimum bending radius (typically 8-12 times diameter)
• Test insulation resistance after installation
• Follow manufacturer guidelines for clipping and support

Relevant Standards

For more on standards, see our guide to Top Certifications for Electrical Cables.

SWA vs AWA Cable

FAQ

Can steel wire armoured cable be used indoors?

Yes, but LSZH versions are recommended for enclosed spaces to minimize smoke in case of fire.

Is SWA cable suitable for direct burial?

Absolutely – it's one of the primary uses, provided buried at adequate depth with warning markers.

What is the difference between SWA and ordinary power cable?

SWA includes steel wire armour for mechanical protection, making it far more durable in exposed or buried applications.