SWA vs AWA Armored Cable: How to Avoid the Wrong Armour Type

When purchasing armored power cable for industrial projects, many buyers simply write “armoured cable” in the inquiry. However, this description is often not precise enough.

In engineering cable selection, SWA cable and AWA cable are not interchangeable structures. They are designed for different cable types and installation conditions.

SWA stands for Steel Wire Armour, while AWA stands for Aluminium Wire Armour. Both provide mechanical protection, but the key difference is not only material strength. In AC power systems, magnetic behavior is a critical factor, especially for single-core cables.

For this reason, understanding SWA vs AWA cable is important for buyers, EPC contractors, and project engineers who need to select the correct armoured cable structure according to project requirements.

What Is SWA Cable?

SWA cable means steel wire armoured cable. It uses a layer of galvanized steel wires around the cable core to provide mechanical protection.

SWA is commonly used in:

· multicore low voltage power cables

· underground cable installation

· industrial power distribution

· cable trenches

· outdoor fixed installation

· locations with mechanical damage risk

A typical SWA low voltage power cable may be described as:

0.6/1kV Cu/XLPE/SWA/PVC 4C x 50mm² compliant with IEC 60502-1

This means:

· 0.6/1kV: rated voltage

· Cu: copper conductor

· XLPE: cross-linked polyethylene insulation

· SWA: steel wire armour

· PVC: PVC outer sheath

· 4C x 50mm²: four cores, each 50mm²

· IEC 60502-1: applicable standard

SWA provides strong mechanical protection and is widely used for multicore power cables. For many industrial and building distribution projects, it is one of the most common armoured cable structures.

What Is AWA Cable?

AWA cable means aluminium wire armoured cable. Instead of steel wire, it uses aluminium wire armour around the cable core.

AWA is commonly used for:

· single-core AC power cables

· large cross-section power cables

· installations where non-magnetic armour is required

· power distribution systems with high current single-core cable routes

A typical AWA cable may be described as:

0.6/1kV Cu/XLPE/AWA/PVC 1C x 240mm² compliant with IEC 60502-1

This means:

· 0.6/1kV: rated voltage

· Cu: copper conductor

· XLPE: insulation

· AWA: aluminium wire armour

· PVC: outer sheath

· 1C x 240mm²: single core, 240mm²

· IEC 60502-1: applicable standard

The main reason for using AWA in single-core AC cables is that aluminium is non-magnetic. This helps avoid additional heating and losses that may occur when magnetic steel armour is used around a single-core AC conductor.

IEC 60502-1 specifies construction, dimensions, and test requirements for extruded solid-insulated power cables with rated AC voltages of 1kV and 3kV for fixed installations such as distribution networks and industrial installations.

SWA vs AWA Cable: Key Differences

The most important point is this:

SWA is commonly used for multicore power cables, while AWA is commonly used for single-core AC power cables.

This is not only a naming difference. It is related to how the cable behaves in an alternating current system.

Why Steel Armour Is Not Suitable for Many Single-Core AC Cables

In a multicore AC cable, the phase conductors are installed together inside the same cable structure. The magnetic fields generated by different phases tend to balance each other to some extent.

In a single-core AC cable, each phase is installed in a separate cable. When current flows through the conductor, it creates an alternating magnetic field around the cable.

If magnetic steel armour is used around a single-core AC conductor, this magnetic field may induce additional losses and heating in the armour.

That is why non-magnetic armour, such as aluminium wire armour, is commonly used for single-core AC power cables.

In practical terms:

· Multicore AC cable: SWA is commonly acceptable and widely used

· Single-core AC cable: AWA is usually preferred because it is non-magnetic

This is one of the most important technical points in SWA vs AWA cable selection. Industry references also note that single-core armoured cables in AC systems commonly use aluminium wire armour or other non-magnetic materials to avoid losses associated with magnetic armour.

When Should Buyers Choose SWA Cable?

Buyers may consider SWA cable when the project requires strong mechanical protection and the cable is a multicore power cable.

Typical scenarios include:

· underground power distribution

· industrial plant power supply

· building main distribution

· cable trench installation

· outdoor fixed cable routes

· power cable routes exposed to mechanical damage risk

SWA cable is especially common for 3-core, 4-core, and 5-core low voltage power cables.

For example:

0.6/1kV Cu/XLPE/SWA/PVC 4C x 95mm² power cable

This type of cable may be used in industrial distribution systems where both electrical performance and mechanical protection are required.

When Should Buyers Choose AWA Cable?

Buyers may consider AWA cable when the project uses single-core AC power cables.

Typical scenarios include:

· high-current power distribution

· large conductor size cable routes

· single-core cable systems

· power plants

· industrial substations

· large infrastructure power systems

For example:

0.6/1kV Al/XLPE/AWA/PVC 1C x 400mm² power cable

In this case, AWA provides mechanical protection while avoiding the magnetic effects that may occur with steel armour in AC single-core systems.

Is AWA Weaker Than SWA?

Many buyers assume that AWA is simply a “lighter” or “weaker” version of SWA. This is not the right way to understand it.

SWA and AWA are selected for different engineering reasons.

SWA focuses mainly on mechanical protection and is widely used in multicore armoured power cables.

AWA focuses on non-magnetic performance and is commonly used in single-core AC cables where magnetic armour may cause additional heating or losses.

So the question is not:

Which one is stronger?

The correct question is:

Which armour type is suitable for this cable structure and AC system?

What About STA Cable?

In addition to SWA and AWA, buyers may also see STA cable, which means Steel Tape Armour.

STA is often used for fixed installation where compression resistance and mechanical protection are required. It is commonly found in some underground, direct burial, or cable trench applications.

However, STA is less flexible than wire armour and is not the same as SWA.

A simplified comparison:

When sending an inquiry, buyers should avoid using only the word “armoured.” The exact armour type should be specified.

Common Procurement Mistakes

Mistake 1: Writing Only “Armoured Cable”

This is too vague. It does not tell the supplier whether SWA, AWA, or STA is required.

A better inquiry should clearly state:

Cu/XLPE/SWA/PVC

or:

Cu/XLPE/AWA/PVC

depending on the cable design.

Mistake 2: Using Steel Armour for Single-Core AC Cables

For single-core AC cables, magnetic steel armour may create additional losses and heating. AWA or other non-magnetic armour is usually more suitable.

Mistake 3: Choosing by Price Only

SWA and AWA should not be selected only by material cost. The correct selection depends on cable core structure, AC/DC system type, installation conditions, and project standards.

Mistake 4: Ignoring Installation Environment

Armour selection should also consider:

· direct burial

· cable trench

· cable tray

· outdoor exposure

· mechanical damage risk

· bending and pulling conditions

Mistake 5: Not Confirming the Applicable Standard

For low voltage power cables in many international projects, IEC 60502-1 is often used as a reference standard. Buyers should confirm whether the required cable structure, voltage rating, and testing requirements match the project specification.

Professional Inquiry Examples

To reduce communication errors, buyers should write full cable structure descriptions.

Example 1: Multicore SWA Power Cable

0.6/1kV Cu/XLPE/SWA/PVC 4C x 50mm² compliant with IEC 60502-1

This describes a copper conductor, XLPE insulated, steel wire armoured, PVC sheathed, four-core low voltage power cable.

Example 2: Single-Core AWA Power Cable

0.6/1kV Cu/XLPE/AWA/PVC 1C x 240mm² compliant with IEC 60502-1

This describes a copper conductor, XLPE insulated, aluminium wire armoured, PVC sheathed, single-core low voltage power cable.

Example 3: Aluminum Conductor AWA Cable

0.6/1kV Al/XLPE/AWA/PVC 1C x 400mm² compliant with IEC 60502-1

This describes a single-core aluminium conductor power cable with XLPE insulation, aluminium wire armour, and PVC sheath.

SWA vs AWA Cable Selection Checklist

Conclusion

In armoured power cable selection, SWA vs AWA cable is not only a matter of material choice.

SWA cable is commonly used for multicore power cables where strong mechanical protection is required. AWA cable is commonly used for single-core AC power cables because aluminium armour is non-magnetic and helps avoid additional heating and losses caused by magnetic steel armour.

When purchasing armored power cable, buyers should not simply write “armoured cable.” They should clearly define the cable structure, such as:

0.6/1kV Cu/XLPE/SWA/PVC 4C x 50mm² compliant with IEC 60502-1

or:

0.6/1kV Cu/XLPE/AWA/PVC 1C x 240mm² compliant with IEC 60502-1

In one sentence:

The right armour type is not only about protection strength — it is about matching the cable core structure, AC system behavior, installation environment, and project standard.