2core Armored Cable Optimal Uses in Power Transmission

Imagine needing to power your garden lighting system or supply electricity to tools in your garage. You’d want a cable that withstands outdoor exposure while resisting physical damage. In such cases, a 2-core armored cable might be the ideal solution—durable, adaptable, but when is it the best choice?

A 2-core armored cable consists of two insulated conductors, typically color-coded blue and brown, encased in a layer of galvanized steel wire armor (SWA). This steel armor acts as a protective shield, safeguarding the cable against impacts, crushing, chemical corrosion, and even rodent damage. The design ensures longevity and reliable power transmission.

To understand its advantages, let’s examine its layered structure:

• Conductor: Stranded copper wires for optimal conductivity and flexibility during installation.
• Insulation: Cross-linked polyethylene (XLPE) provides heat resistance, corrosion protection, and electrical insulation to prevent short circuits.
• Color Coding: Blue and brown cores comply with International Electrotechnical Commission (IEC) standards for easy identification.
• Filling: PVC material fills gaps between cores, enhancing structural integrity.
• Steel Armor: Galvanized steel wires offer robust mechanical protection.
• Outer Sheath: Black PVC resists weathering, abrasion, and chemicals.

This cable is suited for scenarios where a separate earth wire isn’t required:

• Outdoor Lighting: Gardens, pathways, or landscape fixtures.
• Power Tools: Workshops, garages, or construction sites.
• Small Appliances: Non-grounded household devices.
• Control Circuits: Automation systems or sensors.

The choice hinges on grounding needs:

• 2-Core: Suitable when no dedicated earth wire is needed. While the steel armor can serve as a grounding path, this isn’t recommended for critical safety applications.
• 3-Core: Essential for live, neutral, and earth connections, ensuring comprehensive protection.

Though possible, using steel armor as a ground conductor poses risks:

• Higher resistance may compromise protection.
• Corrosion can degrade conductivity over time.
• Armor damage could lead to grounding failure.

For reliable grounding, a 3-core cable with a proper earth wire is advised.

Proper installation ensures safety and performance:

• Select cable size based on current load and distance.
• Use specialized tools (e.g., cable strippers, crimping tools).
• Secure connections and fix cables with clamps or ties.
• Protect exposed sections with conduits or trays.
• Consult a licensed electrician for complex setups.

Cable clamps prevent movement and damage. Choose corrosion-resistant materials (stainless steel or PVC) and ensure proper sizing for a snug fit.

• Conductor: Stranded copper
• Insulation: XLPE
• Voltage Rating: 600/1000V
• Temperature Range: -0°C to 90°C
• Standards: BS5467 (Power Cables)