Types of Armored Cable Swa/ Sta Armoured Power Cable Armoured Cable

Material: Both cable types use high-purity copper (99.95% purity) or aluminum (99.5% purity) conductors. Copper Conductors offer superior conductivity (58 MS/m) and are preferred for high-load applications, while aluminum (37 MS/m) provides a cost-effective, lightweight alternative.

Stranding: Conductors are stranded to enhance Flexibility, with configurations varying by cross-sectional area (from 10mm² to 630mm²). For example, a 50mm² copper conductor consists of 37 strands of 1.3mm diameter, while a 120mm² conductor uses 37 strands of 2.0mm diameter.

Resistance: At 20°C, copper conductor resistance ranges from 0.183Ω/km (10mm²) to 0.015Ω/km (630mm²); Aluminum Conductors range from 0.308Ω/km (10mm²) to 0.025Ω/km (630mm²).

XLPE Insulation: Used in medium-voltage (1kV to 110kV) cables, with thickness ranging from 0.7mm (10mm²) to 4.5mm (630mm²). It offers a long-term operating temperature of 90°C, short-circuit (5s) temperature tolerance of 250°C, and insulation resistance >1000 MΩ·km.

PVC Insulation: Common in low-voltage (0.6/1kV) cables, with thickness from 0.6mm (10mm²) to 2.0mm (630mm²). Operating temperature is 70°C continuously, 160°C for short circuits, and insulation resistance >500 MΩ·km.

SWA: Galvanized steel wires (diameter 1.2mm to 3.0mm) are spirally wound with a lay length of 12-20 times the cable diameter. The number of wires varies: 6 wires for 10mm² cables, 12 wires for 120mm², and 24 wires for 630mm². Tensile strength of the steel wire is ≥350 MPa.

STA: Galvanized steel tape (thickness 0.3mm to 0.8mm) applied via spiral winding (overlap 15-20%) or longitudinal wrapping. Tape width ranges from 20mm to 60mm, with tensile strength ≥300 MPa and zinc coating thickness ≥80μm for corrosion resistance.

Material: PVC or PE (polyethylene) sheaths. PVC Sheaths (thickness 1.0mm to 3.0mm) offer flame retardancy (IEC 60332-1) and Chemical Resistance. PE sheaths (thickness 1.2mm to 3.5mm) provide better impact resistance and low-temperature flexibility (-40°C).

Mechanical Properties: Sheath tensile strength ≥12 MPa, elongation at break ≥150% for PVC; ≥14 MPa and ≥300% for PE.

SWA: 10mm² (55A), 50mm² (185A), 120mm² (310A), 630mm² (620A).

STA: 10mm² (50A), 50mm² (175A), 120mm² (295A), 630mm² (590A).

Minimum bending radius: 12×OD (fixed installation), 20×OD (dynamic installation) for both types.

Maximum pulling tension: Swa Cables (10kN for 10mm², 50kN for 630mm²) exceed STA cables (8kN for 10mm², 40kN for 630mm²) due to stronger armouring.

High-Tension Environments: Ideal for direct burial across railways, highways, and riverbeds, where the steel wire armouring resists longitudinal pulling forces during installation and ground movement. Used in cross-country power links between substations.

Vertical Installations: Deployed in high-rise buildings, elevator shafts, and cable risers, where their tensile strength prevents sagging. They power emergency lighting, fire systems, and HVAC in skyscrapers.

Mobile Equipment Connections: In mines, ports, and construction sites, SWA cables connect cranes, excavators, and drilling rigs. Their flexibility and impact resistance withstand constant movement and rough handling.

Marine and Offshore: Used on ships, oil rigs, and coastal facilities. The galvanized steel wires resist saltwater corrosion, while the armouring protects against anchor drag and wave impact.

Underground Distribution: Dominant in urban power grids, residential areas, and industrial parks for direct burial. The steel tape armouring shields against soil pressure, root intrusion, and rodent damage. Common in feeder lines from transformers to distribution cabinets.

Conduit and Duct Installations: Pulled through PVC or metal ducts in commercial buildings and tunnels. STA’s radial strength resists crushing from adjacent pipes or concrete pouring.

Low-Traffic Areas: Used in parks, campuses, and rural electrification projects, where soil pressure is moderate. They power streetlights, irrigation systems, and small community facilities.

Corrosive Environments: With PE sheaths, STA cables operate in chemical plants, wastewater treatment facilities, and landfills. The sheath prevents chemical ingress, while the steel tape resists abrasion.

Copper: Oxygen-free copper (OFC) minimizes oxidation, ensuring stable conductivity over time. Annealed to reduce brittleness, enhancing flexibility for stranding and installation.

Aluminum: Alloyed with magnesium and silicon (AA 8030 series) to improve strength and corrosion resistance. Lightweight (1/3 the weight of copper) reduces transportation costs and eases handling.

XLPE: Cross-linked via peroxide or electron beam radiation, forming a thermoset structure. Resistant to water treeing (critical for underground use) and thermal aging, extending service life to 40+ years.

PVC: Formulated with plasticizers (dioctyl phthalate) for flexibility and stabilizers (calcium/zinc compounds) to resist heat degradation. Cost-effective but less durable than XLPE in high temperatures.

SWA Steel Wires: Hot-dip galvanized low-carbon steel (EN 10219) with a zinc coating to prevent rust. Wires undergo tensile testing to ensure consistent strength.

STA Steel Tapes: Cold-rolled steel (EN 10130) with galvanization. Tapes are slit to width and deburred to avoid sheath puncturing during wrapping.

PVC: Flame-retardant grade (FR-PVC) with additives like antimony trioxide. Resistant to oils, acids, and UV radiation, suitable for outdoor and industrial use.

PE: High-density polyethylene (HDPE) with impact modifiers. Impermeable to moisture, making it ideal for wet environments. UV-stabilized grades prevent degradation in sunlight.

SWA: Typically round with a smooth outer surface. The spiral steel wires create a ridged texture under the sheath, visible in cross-section. Available in black (standard) or orange (high-visibility for construction zones).

STA: Round or slightly flattened, depending on tape wrapping. Spiral-wound STA has a subtle helical pattern; longitudinally wrapped STA is smoother. Colors include black, gray, and yellow (for hazardous areas).

Core Configuration: Multi-Core designs (2C to 4C) for three-phase power, with a neutral conductor. Filler materials (polypropylene ropes) ensure circularity, and a non-woven tape binds cores before armouring.

Copper/aluminum rods are drawn into wires via diamond dies, reducing diameter from 8mm to 1.0-3.0mm.

Wires are stranded in a planetary stranding machine, twisted at a lay length of 16-20×wire diameter. Annealing follows in a nitrogen atmosphere furnace (350°C for copper, 300°C for aluminum) to soften the metal.

For XLPE: Insulation compound (base polymer + cross-linking agents) is extruded over conductors at 120-150°C. The Insulated Core passes through a curing tube (180-200°C) for chemical cross-linking, then cooled in water.

For PVC: PVC compound is extruded at 160-180°C, forming a continuous layer. No curing is needed; the insulation cools immediately in a water bath.

Insulated Conductors are cabled together with fillers using a bow-type machine, ensuring uniform tension. A non-woven polyester tape is wrapped around the core to prevent abrasion during armouring.

SWA: Steel wires are payed off from reels, pre-formed to match the cable’s lay length, then spirally wrapped around the cabled core using a rotating head. Tension is controlled to avoid wire breakage or core deformation.

STA: Steel tapes are unwound, flattened, and wrapped around the core—either spirally (overlapping) or longitudinally (butt-welded seams for continuous protection). A tension roller ensures tight wrapping without creasing.

The Armoured Core is fed into a sheath extruder, where PVC or PE is melted (170-200°C) and applied over the armouring. The sheath is cooled in a water bath, with laser gauges monitoring thickness.

Conductors: Resistance testing (IEC 60228) and strand integrity checks.

Insulation: Dielectric strength (AC voltage test at 2.5×rated voltage for 5min) and thickness measurement.

Armouring: Adhesion testing (sheath peel strength ≥1.5N/mm) and corrosion resistance (salt spray test per ASTM B117 for 96 hours).

Final Cable: Partial discharge testing (for medium voltage) and flame retardancy verification.

SWA Cables: Wound onto steel reels (diameter 800mm to 2500mm) due to higher weight. Reels have flanges reinforced with ribs to withstand tension during unwinding. 10mm²-50mm² cables: 500m/reel; 120mm²-630mm²: 250m/reel.

STA Cables: Wound onto wooden or steel reels (diameter 600mm to 2000mm). Wooden reels (plywood flanges) are cost-effective for low-voltage, small-diameter cables (10mm²-35mm²).

A UV-resistant polyethylene film wraps the coiled cable to block moisture and dust. For long-term storage (>6 months), a layer of kraft paper is added to absorb condensation.

SWA reels include a steel banding (25mm width) to secure the cable end, preventing unwinding during handling.

Cable type (SWA/STA), conductor size, voltage rating, and core count

Material specifications (insulation, sheath, conductor)

Batch number, production date, and compliance marks (CE, UL, IEC)

Handling symbols: “Do Not Stack,” “Use Crane Here,” “Store Below 50°C”

Road: Flatbed trucks with reel chocks and chain restraints for steel reels. SWA cables (heavier) use trucks with reinforced beds. Enclosed trailers shield STA cables from rain/snow.

Rail: Railcars with reel saddles (adjustable to reel diameter) prevent lateral movement. Cables are loaded via overhead cranes with soft slings (nylon webbing) to avoid flange damage.

Sea/Air: Container shipping for international orders. Reels are secured to container floors with twist locks; desiccants (1kg/10m³) control humidity. Air freight uses lightweight wooden crates for urgent deliveries.

Reels are lifted via axle holes (steel reels) or forklift tines under flanges (wooden reels). Never lift by the cable itself.

SWA reels require two-point lifting due to uneven weight distribution from spiral armouring.

During loading, reels are spaced ≥300mm apart to prevent collision. Edges are padded with rubber mats to avoid sheath scuffing.

Cables are transported at -20°C to 50°C. In cold climates, heated containers prevent PVC sheath cracking. In hot climates, reflective tarps reduce solar heating.

Avoid prolonged exposure to salt spray during sea transport; reels are wrapped in anti-corrosive film.

Standard Cables (0.6/1kV, 10-120mm²) ship within 3-5 business days. Custom lengths or medium-Voltage Cables require 7-14 days.

Online tracking provides real-time shipment updates, with alerts for delays (weather, customs).

Customers receive a 48-hour delivery window. For construction sites, delivery is coordinated with site managers to avoid storage congestion.

Lift-gate service is available for locations without forklifts, with trained personnel assisting in reel placement.

Customers verify reel condition (no flange damage), cable length (matches order), and sheath integrity (no cuts/scratches).

A delivery receipt is signed, noting any discrepancies for claims processing.

Commercial invoice and packing list

Test certificates (insulation resistance, voltage withstand, armouring strength)

Installation guide with bending radius charts and termination recommendations

Material safety data sheets (MSDS) for insulation and sheath compounds

Conductor resistance (using a micro-ohmmeter)

Insulation thickness (via calipers)

Armouring adhesion (peel test)

Flame retardancy (small-scale vertical burn test)

Engineers provide on-site or remote guidance for installation, including proper termination methods (compression lugs for SWA, crimp connectors for STA).

CAD drawings of cable routing and bending diagrams are available for complex projects.

10-year warranty covers manufacturing defects (e.g., insulation voids, armouring detachment). Normal wear (e.g., sheath abrasion from improper installation) is excluded.

Warranty claims are processed within 5 business days, with replacement cables shipped expedited if critical systems are affected.

For post-warranty issues, technicians assess damage (e.g., sheath punctures, armouring corrosion) and offer cost-effective repairs. Sheath repairs use heat-shrink sleeves; armouring damage may require section replacement.

Bulk replacement discounts are available for large-scale projects, with 旧电缆回收计划 (old cable recycling programs) to promote sustainability.

Free workshops for installers cover proper handling, termination, and testing. Sessions include live demonstrations of crimping tools and insulation resistance meters.

Online resources (videos, manuals, FAQs) are updated quarterly to address emerging installation challenges, such as compatibility with smart grid sensors.

A dedicated customer portal allows users to submit performance feedback, which is reviewed by the R&D team. Common issues (e.g., sheath degradation in high-UV areas) drive material upgrades.

Annual surveys of industrial clients inform new product development, such as SWA cables with enhanced fire resistance for data centers.

IEC 60502-1: Governs low-voltage (up to 1kV) Power Cables, specifying conductor, insulation, and armouring requirements.

BS 6346: British standard for Armoured Cables, detailing construction, testing, and marking for SWA and STA types.

UL 44: Underwriters Laboratories standard for Insulated power cables, ensuring flame retardancy and electrical safety for North American markets.

CE Marking: Indicates compliance with EU directives (2014/35/EU for low voltage), allowing free movement within the European Economic Area.

Cables undergo third-party testing by organizations like SGS, Intertek, and DEKRA. Certificates validate compliance with standards for:

For Middle Eastern markets, cables are tested for resistance to sand abrasion (per ISO 12135) and high-temperature endurance (60°C ambient).

In Southeast Asia, humidity resistance testing (95% RH at 40°C for 1000 hours) ensures performance in tropical climates.

North American variants include UL-listed conductors and meet NEC (NFPA 70) requirements for burial depth and conduit fill.

Copper and aluminum are sourced from recycled content (minimum 30% for copper, 40% for aluminum) to reduce mining impact. Suppliers are audited for compliance with responsible mining standards (e.g., ICMM Principles).

XLPE and PVC compounds use bio-based plasticizers (where possible) to reduce reliance on petroleum derivatives. Halogen-free options (LSZH sheaths) are available for environmentally sensitive areas.

Factories use energy-efficient extrusion lines (variable frequency drives) and waste heat recovery systems, cutting carbon emissions by 20% compared to conventional processes.

Water used in cooling baths is recycled (closed-loop systems), reducing consumption by 50,000 liters per month per production line.

Cables are 95% recyclable: copper/Aluminum Conductors are melted and reused; steel armouring is recycled into new steel products; plastic sheaths are pelletized for secondary applications (e.g., pipe insulation).

A take-back program offers clients discounts on new orders in exchange for old cables, diverting 500+ tons of waste from landfills annually.

The carbon footprint of a 100m length of 50mm² SWA cable is 120kg CO₂e, calculated from cradle to gate. Manufacturers offset this via reforestation projects, achieving carbon-neutral status for select product lines.