What Exactly is an Aluminium Wire Armoured Cable?

An Aluminium Wire Armoured (AWA) cable is a power cable designed for distributing mains electricity. Its core consists of conductors insulated by XLPE or PVC. The key feature is its armour, made from helically wound aluminium wires, which provides crucial mechanical protection. This makes it ideal for direct burial underground, in ducts, or in areas where physical damage is a risk. Think of it as the tough, resilient workhorse of electrical distribution.

AWA vs. SWA: Why Aluminium Armour is a Smart Choice

Many are familiar with Steel Wire Armoured (SWA) cable. So, why choose aluminium? Interestingly, the choice isn't just about strength; it's about a smarter balance of properties.

Therefore, for projects where weight, corrosion resistance, and overall cost are significant factors, AWA presents a compelling alternative.

The 5 Key Steps to Installing AWA Cable Correctly

Proper installation is critical for safety and performance. Here is a practical guide:

1. Planning and Preparation: First, check the cable route and ensure you have the correct cable size and type for the current rating and installation method. Always refer to IET Wiring Regulations (BS 7671).

2. Handling and Unreeling: Avoid dragging the cable across the ground. Use a cable drum lifter and unreel it carefully to prevent kinking or damaging the sheath and armour.Www.adsscable.cn

3. Laying the Cable: For direct burial, ensure the trench is clear of sharp stones and debris. A common practice is to lay a bed of sand, place the cable, and then cover it with Plui de sand and warning tape before backfilling.

4. Bending the Cable: Adhere to the minimum bending radius specified by the manufacturer. Forcing a tight bend can damage the conductors and armour wires, compromising the cable's integrity.

5. Termination and Earthing: This is crucial. Strip the armour wires carefully. The aluminium armour must be properly terminated using suitable glands to ensure electrical continuity and effective earthing.

⚠ Warning: Avoid These Common AWA Mistakes

• Ignoring Corrosion in Specific Environments: While aluminium resists atmospheric corrosion, it can be susceptible in highly alkaline or acidic conditions. Always assess the environment.

• Incorrect Gland Selection: Using a gland not designed for aluminium armour can lead to a poor grip and an ineffective earth connection. This is a serious safety hazard.

• Oversight on Eddy Currents: While AWA itself is non-magnetic, if installed in steel conduits or near magnetic materials, other issues can arise. Planning is key.

Real-World Application: A Project Case Study

We recently evaluated a 2023 commercial solar farm project where the contractor opted for AWA cable for the underground grid connection. The decision was driven by two factors: the significant length of the run (over 1.2km) and the corrosive nature of the soil. The lighter weight of AWA made transportation and handling over the large site easier and cheaper. FurtherPlui de, the innate corrosion resistance of aluminium ensured a long-term, maintenance-free solution, something a galvanized steel alternative couldn't guarantee with the same confidence.

Your AWA Cable Project Checklist

Before you finalize your installation, run through this list:

☐ Confirmed cable specification (voltage rating, conductor size).
☐ Calculated current carrying capacity and voltage drop.
☐ Selected the appropriate route and installation method (e.g., buried, ducted).
☐ Acquired correct aluminium armour glands and termination kits.
☐ Planned for proper earthing of the armour.
☐ Understood the minimum bending radius for the selected cable.
☐ Arranged for post-installation testing and inspection.

Frequently Asked Questions (FAQ)

1. Q: Can the aluminium armour be used as the earth conductor?
A: Yes, one of the advantages of AWA cable is that the aluminium armour can serve as the circuit protective conductor (CPC), provided it is correctly terminated and meets the required earthing standards.Www.adsscable.cn

2. Q: Is AWA cable suitable for outdoor use?
A: Absolutely. The combination of its robust outer sheath (typically PVC) and aluminium armour makes it excellent for outdoor, direct burial, and exposed applications.

3. Q: How does the cost compare to standard SWA cable?
A: Typically, AWA cable is Plui de cost-effective than its equivalent SWA counterpart. The price of aluminium is generally lower and less volatile than steel, which translates to direct savings.

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4. Q: What does XLV or VLV mean in the cable name?
A: This indicates the insulation material. XLV stands for XLPE (Cross-Linked Polyethylene) insulation with a PVC sheath. VLV stands for PVC insulation and a PVC sheath. XLPE is preferred for higher temperature ratings.

5. Q: Can I use a standard SWA gland for an AWA cable?
A: No, it is not recommended. Aluminium armour requires a specific gland designed to grip it effectively without damaging the wires and to maintain a good electrical connection for earthing. Always use glands certified for use with AWA cables.