SWA Cable: 5 Key Components And Core Applications
Steel Wire Armoured (SWA) cable is a robust and hard-wearing power cable designed for high-stress applications, featuring steel wire protection to prevent damage.
Its construction makes it suitable for underground installation, power networks, and industrial use. As specialist distributors, we supply a comprehensive range of SWA cables and accessories to meet your project's specific demands.
This article covers the main components, common applications, and key types of SWA cable, helping you understand why it is a trusted solution for mechanical protection and power distribution. We will also detail how our wider range of electrical cables and services provides a complete solution.
What Is SWA Cable?
SWA cable is a mechanical, armoured electrical cable used for mains electricity supply. The armour provides mechanical protection, allowing the cable to withstand physical stress and be buried directly in the ground. It is most commonly used for external wiring or in industrial settings where equipment or environmental factors could damage the cable.
SWA cable is a vital part of our electrical cables range. We provide SWA for everything from large-scale construction projects to smaller domestic garden supplies.
What Are The 5 Main Components Of SWA Cable?
The 5 main components of SWA cable are the conductor, insulation, bedding, armour, and sheath. Each layer serves a specific protective or conductive purpose.
Layer-by-Layer Breakdown
- Conductor: This consists of plain stranded copper (or aluminium), which carries the electrical current.
- Insulation: Cross-linked polyethylene (XLPE) is typically used to insulate the conductors. It has high heat resistance and excellent dielectric strength.
- Bedding: A layer of Polyvinyl Chloride (PVC) separates the inner conductors from the steel armour.
- Armour: A layer of steel wires (or aluminium for single-core cables) provides the cable's signature mechanical protection.
- Sheath: A final outer layer, usually made of PVC, protects all the internal components from environmental damage, moisture, and chemical exposure.
Where Is SWA Cable Commonly Used?
SWA cable is commonly used in industrial applications, power networks, and construction projects. Its robust design is ideal for any installation where the cable may be subject to physical impact or abrasion.
Common SWA Installation Sites
We supply SWA cables for a wide variety of sectors. Common applications include:
- Underground Systems: It can be buried directly in the ground, making it perfect for external power supplies.
- Power Networks: Used extensively by utility companies for distributing power.
- Industrial Plants: Feeds power to heavy-duty machinery in factories and processing plants.
- Outdoor Lighting: Provides a protected power source for street lights and garden lighting.
- Construction Sites: Delivers temporary and permanent power in demanding site conditions.
Is SWA Cable Suitable For Underground Use?
Yes, SWA cable is the industry standard for direct burial underground. The steel wire armour provides excellent protection against soil compression and accidental damage from spades or excavation. When buried, it must be installed at the correct depth as defined by wiring regulations.
Is SWA Cable Waterproof?
No, SWA cable itself is not classified as waterproof, but it is highly water-resistant. The outer PVC sheath provides excellent protection against moisture ingress. For an installation to be fully waterproof, correctly specified SWA cable glands (such as CW or BW types) must be used at all terminations to create a secure, watertight seal.
What Are The Main Types Of SWA Cable?
The 2 main types of SWA cable are defined by their outer sheath and insulation, primarily BS 5467 and BS 6724. Both are commonly used, but their selection depends on the installation environment.
BS 5467 (PVC)
This is the most common type, featuring XLPE insulation and a black PVC outer sheath. It is versatile, robust, and suitable for most external and underground applications in the UK. We stock this as a standard item for general industrial and external wiring.
BS 6724 (LSZH)
This cable has Low Smoke Zero Halogen (LSZH) insulation and sheathing. It is specified for use in public areas or high-risk environments, such as railway tunnels, hospitals, and airports. In the event of a fire, it emits very low levels of smoke and no toxic halogen gases.
How Can We Help With Your SWA Cable Needs?
As specialist cable distributors, we provide a complete solution for SWA cable and all related equipment. We leverage our extensive stock and industry partnerships to supply everything you need for your installation, delivered directly to your site.
Essential SWA Accessories We Supply:
- SWA Cable Glands: Brass glands (CW, BW, E1W) to terminate the cable and earth the armour.
- Cable Cleats: To safely secure the cable to walls or trays.
- Cable Joints: For extending cable runs or repairing damage.
- Cable Lugs: To connect the conductors securely to equipment.
Our expertise covers the full spectrum of electrical cables, ensuring that every component you receive from us is compatible and certified to the correct standards.
Why Is SWA The Right Choice For Robust Cabling?
SWA is the right choice because it provides unparalleled mechanical protection without compromising electrical performance. Its multi-layer construction is specifically engineered to withstand physical stress, direct burial, and harsh environments. This reliability makes it the preferred cable for ensuring the safety and longevity of critical power supplies.
Your Partner For All Cable Types And Services
Contact Cable Services today to discuss your SWA cable requirements with our technical team.
For quick quote and expert advice, contact us today.
Tel: + 44 (0) 1978 340 450 Email: sales@cableservices.co.ukCable Services supply a wide range of products from leading brands, click here to see a sample range of cables that can offer:
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Tel: + 44 (0) 1978 340 450
Email: sales@cableservices.co.uk
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