Low-Voltage SWA Armoured Cable: Sizes, Applications, and Selection Guide
Low-voltage SWA armoured cable is a power cable with steel wire armour designed to provide mechanical protection in fixed installations. It is commonly specified for systems rated at 0.6/1 kV, with conductor size, core count, insulation, and outer sheath selected to suit the electrical load and installation environment. Typical applications include building power distribution, industrial equipment, and outdoor cable routes, but the correct specification depends on more than load current alone. We recommend confirming current capacity, voltage drop, fault protection, installation conditions, and applicable local standards before placing an order.
Who This Guide Is For
This guide is for electrical contractors, project engineers, distributors, and procurement teams comparing cable options for low-voltage projects. It explains how SWA construction works, which size and material choices matter, and what information to include in an RFQ. It is intended as a purchasing and specification overview, not a substitute for engineering design or local electrical regulations. Final cable selection should be checked by a qualified designer using project-specific data.
What Is Low-Voltage SWA Cable?
SWA stands for steel wire armoured. In a typical construction, one or more conductors are surrounded by insulation, laid up with any required fillers or bedding, protected by steel wire armour, and finished with an outer sheath. The armour helps resist mechanical damage during handling and installation and can provide a protective path in an electrical fault when the design and termination arrangement support that function. It does not make a cable immune to crushing, corrosion, water ingress, or incorrect installation.
Common Construction Options
Conductor material is often copper or aluminium. Copper is commonly selected where conductivity, compact dimensions, or connection practices are priorities; aluminium may be considered where weight or material cost is important, subject to compatible glands, terminals, and design calculations. Insulation and sheath materials should match the temperature, moisture, chemical, UV, and fire-performance requirements of the route.
PVC and XLPE are common insulation options, while outer sheaths may be PVC or another specified compound, including low-smoke or halogen-free options where the project requires them. As a general reference, PVC-insulated cable designs are often associated with a maximum conductor operating temperature of 70°C, and XLPE designs with 90°C, subject to the applicable cable standard and product construction. These are design ratings, not permission to operate a cable above its specified limits.
Sizes, Cores, and Key Specifications
Cable size is normally stated as conductor cross-sectional area in square millimetres (mm²), together with the number of cores. A project may call for a small control or auxiliary power cable, or a larger feeder cable; available sizes and configurations vary by manufacturer, standard, and construction. A size cannot be selected reliably from equipment wattage alone because installation method, ambient conditions, grouping, route length, and protective-device coordination also affect the result.
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| Specification | What to confirm |
|---|---|
| Rated voltage | For example, whether a 0.6/1 kV cable is appropriate for the system and local requirements. |
| Conductor | Copper or aluminium, cross-sectional area, stranding, and conductor class required by the design. |
| Core count | Number of power cores, plus any neutral or earth arrangement required for the circuit. |
| Insulation and sheath | Material, temperature rating, fire-performance requirements, and resistance to environmental exposure. |
| Armour and termination | Armour material, gland compatibility, bonding method, and whether the route requires additional protection. |
Applications and Cable Matching
Low-voltage SWA is used in fixed power distribution where a cable may be exposed to mechanical hazards, such as industrial sites, plant rooms, building services, and suitable outdoor routes. It can be considered for direct burial only when the cable construction, installation method, soil conditions, and project requirements permit it. Burial depth, warning measures, jointing, and protection should follow the applicable regulations and project specification. The word “armoured” should not be treated as a blanket approval for every underground or hazardous environment.
Match the Construction to the Route
For a route with potential impact or abrasion, assess whether the armour and sheath provide the required protection or whether conduit, ducting, or other safeguards are also needed. For wet, corrosive, or chemically exposed locations, verify the sheath’s suitability and the quality of joints and cable entries. For single-core AC circuits, the armour and installation arrangement require particular attention because magnetic effects can occur with steel armour; the design may call for a non-magnetic armour solution. Confirm this point with the cable designer and applicable standard rather than assuming a standard multicore construction is suitable.
How to Select a Suitable SWA Cable
- Define the electrical duty. Record the system voltage, load current, starting or inrush conditions where relevant, and protective-device details. Identify whether the cable carries three-phase, single-phase, or another circuit arrangement.
- Measure the route and installation conditions. Document cable length, installation method, ambient temperature, grouping with other cables, and exposure to moisture, sunlight, chemicals, or physical damage. These factors can affect current capacity and the required cable construction.
- Check the conductor size by calculation. Confirm current-carrying capacity, voltage drop, short-circuit withstand, and protective-device coordination under the relevant design rules. A longer run may require a larger conductor even when the load current is unchanged.
- Specify materials and cores. State copper or aluminium, conductor area, core count, insulation, sheath, armour, and any fire or environmental requirements. Include any restrictions on single-core use or termination hardware.
- Confirm compliance and installation details. Name the required national or project standard and confirm cable markings, glands, lugs, earthing or bonding arrangements, and installation accessories. Requirements differ across markets, so a generic product description is not enough for approval.
Pricing, MOQ, and Lead-Time Considerations
Price depends on factors such as conductor material and size, core count, insulation and sheath compounds, armour construction, order quantity, and packaging. Copper and aluminium options should be compared on a complete installed-design basis rather than purchase price alone, because conductor dimensions and compatible accessories may differ. Minimum order quantities and production lead times are supplier- and specification-dependent; buyers should request current details rather than rely on a general estimate.
For a useful quotation, provide the cable datasheet or full technical schedule, required quantity, delivery destination, preferred reel lengths, and target delivery date. If substitutions are acceptable, state which properties are mandatory and which can be offered as alternatives for review. This helps suppliers quote comparable products and reduces the risk of a technically unsuitable substitution.
Supplier Evaluation Checklist
- Can the supplier confirm the exact construction, voltage rating, conductor material, and applicable standard?
- Are technical datasheets and product marking details available for review before order confirmation?
- Can the supplier clarify reel lengths, packaging, MOQ, production schedule, and shipping terms?
- Are cable glands, terminations, and installation requirements clearly addressed in the project documentation?
- Does the supplier identify deviations or assumptions instead of presenting them as confirmed compliance?
At Zhongdong Cable Co., Ltd., we support B2B buyers by reviewing requested cable specifications and discussing suitable construction options for their stated application. Share the voltage, conductor material and size, core count, applicable standard, quantity, and delivery requirements so we can assess the request and confirm available options. Our quotation should be evaluated against the project’s approved technical requirements before procurement.
Key Takeaways
- Low-voltage SWA cable combines insulated conductors with steel wire armour for fixed power applications where mechanical protection is relevant.
- Common reference ratings include 0.6/1 kV, while conductor temperature limits depend on insulation and the cable’s declared specification.
- Choose size through electrical calculations that account for load, route length, installation conditions, voltage drop, and fault protection.
- Confirm armour, sheath, glands, and installation method against the environment and local requirements, especially for single-core AC circuits and burial.
Conclusion: What to Do Before You Buy
The right low-voltage SWA armoured cable is the one whose electrical rating, conductor size, construction, and installation method meet the project design—not simply the cable with the largest conductor or the lowest quoted price. Start by documenting the load, route, environment, and required standard, then have the cable size and protection checked by a qualified designer. Once those details are confirmed, request quotations using a complete technical schedule so suppliers can respond on a like-for-like basis. Contact Zhongdong Cable Co., Ltd. with your project requirements to discuss specification options, quantity, and delivery planning.