Armored cable is an electrical cable designed with an additional metallic protective layer (armor) to provide enhanced mechanical protection, impact resistance, and durability. The armor is typically made of steel wire (SWA), steel tape (STA), or aluminum wire (AWA) and is installed between the inner bedding and the outer sheath. Armored cables are widely used in underground power distribution, industrial plants, substations, and outdoor installations where cables may be exposed to mechanical damage or harsh environments. Common standards include IEC 60502-1, BS 5467, and VDE 0276.
| Parameter | Steel Wire Armored (SWA) | Steel Tape Armored (STA) | Aluminum Wire Armored (AWA) |
|---|---|---|---|
| Armor Type | Galvanized steel wires | Galvanized steel tape | Aluminum wires |
| Typical Voltage Rating | 0.6/1 kV – 35 kV | 0.6/1 kV – 35 kV | 0.6/1 kV – 35 kV |
| Mechanical Protection | Very High | High | Medium–High |
| Flexibility | Better | Lower | Good |
| Magnetic Compatibility | Not suitable for single-core AC | Suitable for multi-core | Suitable for single-core AC |
| Typical Application | Underground/industrial | Buried fixed installations | Single-core HV/LV systems |
| Standard | IEC 60502 / BS 5467 | IEC 60502 | IEC 60502 |
Material: Annealed copper or aluminum
Function: Carries electrical current
Materials: PVC, XLPE, or EPR
Temperature Ratings:
PVC: 70°C
XLPE: 90°C
Separates insulation from armor
Usually made of PVC or extruded compound
Protects against:
Mechanical impact
Crushing forces
Rodent damage
Tensile stress
Materials: PVC, PE, LSZH
Protects against moisture, chemicals, and UV exposure
| Cable Type | Construction Example | Main Use Case |
|---|---|---|
| SWA Power Cable | Cu/XLPE/PVC/SWA/PVC | Underground LV power distribution |
| STA Control Cable | Cu/PVC/STA/PVC | Industrial control circuits |
| AWA Single-Core Cable | Al/XLPE/AWA/PE | Single-core AC systems |
| Armored Instrument Cable | Multi-pair + shield + armor | Process automation systems |
| LSZH Armored Cable | XLPE + armor + LSZH sheath | Public buildings and tunnels |
Direct burial installations
Resistant to soil pressure and excavation risks
Factories, petrochemical plants, mining operations
High mechanical stress environments
Exposed to UV, moisture, and physical impact
Often combined with XLPE insulation
Shielded + armored designs for EMI-sensitive systems
| Feature | Armored Cable | Unarmored Cable |
|---|---|---|
| Mechanical Protection | High | Low |
| Underground Installation | Suitable | Requires conduit protection |
| Cost | Higher | Lower |
| Weight | Heavier | Lighter |
| Durability | Excellent | Moderate |
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