In the field of power distribution and industrial control, cables are not only carriers of electrical energy but also critical guarantees of safety and reliability. Among the many types of cables, SWA (Steel Wire Armoured Cable) and SWB (Steel Wire Braided Cable) are two that are often compared.
Both types provide mechanical protection, but they differ fundamentally in armouring methods, mechanical strength, flexibility, and application scenarios. For project contractors, engineers, and procurement managers, understanding these differences is essential for proper cable selection, cost optimization, and long-term system reliability.
This article provides an in-depth analysis of the technical characteristics and applications of SWA and SWB cables, and compares them with XLPE SWA Cable as a reference point. It also explains how choosing an IEC-certified manufacturer with extensive international experience can ensure safe, efficient, and reliable cable supply for diverse projects.
What Is SWA Cable?
SWA Cable (Steel Wire Armoured Cable) is one of the most widely used armoured cables. It is designed with strong circular steel wires as its protective layer, making it particularly suitable for underground installation and heavy-duty environments.
Construction of SWA Cable
1.Conductor: Copper or aluminum conductors, manufactured according to IEC 60228. Options include Class 2 (stranded) or Class 5 (flexible).
2.Insulation: Usually PVC (Polyvinyl Chloride) or XLPE (Cross-Linked Polyethylene). XLPE offers excellent thermal resistance, with continuous operation at 90°C.
3.Bedding and fillers: Maintain roundness and stability.
4.Armour: Circular steel wires provide resistance to both longitudinal and transverse mechanical stress.
5.Sheath: Typically PVC or LSF (Low Smoke and Fume), protecting against moisture, UV, and chemicals.
Applications of SWA Cable
·Underground cable installations
·Large-scale commercial and public buildings (airports, hospitals, universities)
·Industrial environments such as mining, metallurgy, petrochemical plants
·High mechanical stress environments (ports, tunnels, rail systems)
Common Specifications of SWA Cable
·Voltage rating: 0.6/1kV, with medium voltage options (6kV, 11kV) available
·Cross-sectional area: 16mm² – 500mm²
·Conductor types: Single-core, three-core, four-core
What Is SWB Cable?
SWB Cable (Steel Wire Braided Cable) uses fine steel wires woven into a braided layer, offering greater flexibility than SWA cables. It is well-suited for applications requiring frequent bending or mobility.
Construction of SWB Cable
1.Conductor: Copper, often multi-stranded for higher flexibility.
2.Insulation: Typically PVC or XLPE.
3.Braid: Fine steel wires woven in mesh form, providing both shielding and mechanical protection.
4.Sheath: PVC or LSF material for enhanced durability.
Applications of SWB Cable
·Power supply for mobile equipment
·Mechanical control circuits
·Medium mechanical protection requirements
·Locations with frequent vibration or movement
Common Specifications of SWB Cable
·Voltage rating: 0.6/1kV
·Cross-sectional area: 1.5mm² – 70mm²
·Core options: 2-core, 3-core, 4-core, and multi-core control cables
SWA vs. SWB: Core Differences
| Feature | SWA Cable | SWB Cable |
|---|---|---|
| Armour type | Circular steel wire | Fine steel wire braid |
| Mechanical strength | Very high, excellent resistance to crushing | Moderate, less than SWA |
| Flexibility | Rigid, less bendable | Highly flexible, easy to install |
| Application scenarios | Underground, heavy-duty, power transmission | Mobile equipment, control circuits |
| Common range | 16 – 500mm² | 1.5 – 70mm² |
👉 In short: SWA is stronger, SWB is more flexible.
Comparison with Other Cable Types (Taking XLPE SWA Cable as Example)
XLPE SWA Cable is a widely used variant of SWA, insulated with cross-linked polyethylene (XLPE). It delivers superior electrical and thermal performance compared with PVC-insulated or braided alternatives.
XLPE SWA Cable vs. SWB Cable
1.Thermal Performance
·XLPE SWA: Operates continuously at 90°C, short-circuit up to 250°C.
·SWB: Usually PVC-insulated, limited to 70°C continuous operation.
2.Current-Carrying Capacity
·XLPE SWA: Higher ampacity, suitable for main power distribution.
·SWB: Lower ampacity, designed for smaller loads and flexible wiring.
3.Application Environment
·XLPE SWA: Ideal for power transmission, heavy industry, and infrastructure.
·SWB: More appropriate for machinery, control systems, and mobility applications.
Thus, XLPE SWA Cable is optimized for strength and high performance, while SWB Cable emphasizes flexibility and convenience.
Installation Considerations
SWA Cable Installation
·Bending radius: Minimum 12D (D = cable diameter) to prevent damage to the armour.
·Fixing method: Secure with cable cleats, trays, or ducts.
·Earthing: The armour can serve as an earth conductor but must comply with IEC standards.
SWB Cable Installation
·Flexibility: Well-suited for cable trays and machine connections.
·Mechanical protection: Avoid installation in heavily loaded or buried environments.
·Earthing: Braided layer can be used as a screen and grounding conductor.
Our Strengths
We Specialize in Manufacturing IEC Standard Cables
Our product portfolio includes SWA, SWB, XLPE SWA, PVC SWA, STA, control cables, and unarmoured power cables, meeting the needs of diverse applications such as power transmission, industrial automation, and infrastructure.
Products Fully Comply with American Market Requirements
All cables are manufactured according to IEC standards and also meet UL and CSA requirements for North and South America.
Full Range of Specifications Starting from 16mm²
From low-voltage power cables to medium-voltage distribution systems, we cover the complete range of sizes and types.
Fast Delivery for Small and Large Orders
With modern production facilities and efficient supply chain management, we ensure rapid dispatch. Both large-scale projects and small custom orders can be delivered promptly.
Professional Technical Support with Reliable After-Sales Service
Our team of experienced electrical engineers provides full support in cable selection, installation guidance, and troubleshooting.
Extensive Global Experience and International Partnerships
We have supplied cables for projects including airports, mines, universities, ports, and energy facilities, with long-standing cooperation worldwide.
IEC-Certified Cables Ensuring Safety and Reliability
Every cable undergoes strict electrical performance tests, mechanical tests, and fire resistance tests, guaranteeing compliance with international standards.
Wide Range of Colors with Comprehensive Customization Options
We provide customization in materials, sizes, lengths, colors, performance, markings, and packaging, helping clients achieve tailored project requirements.
Contact Us
Dongguan Greater Wire & Cable Co., Ltd.
·Tel/WhatsApp/Wechat: +86 135 1078 4550 / +86 136 6257 9592
·Email: manager01@greaterwire.com