An armored power cable adds a metallic layer between insulation and outer sheath, and that single decision changes how the cable survives, is grounded, and is installed. Steel-tape armored power cable suits ducts and direct burial where crushing, not pulling, is the threat; steel-wire armour carries tensile load in vertical shafts, while aluminium wire armour offers lighter weight with comparable fault-current capacity. The armour must be earthed: verify its cross-section withstands prospective fault current, and remember single-core AC cables in magnetic armour overheat from sheath circulating currents unless armour and shield are bonded correctly. Where corrosive soil or chemicals exist, galvanised or copper wire, or a polyethylene oversheath over the armour, prevents the steel from rusting through years early. Termination demands the right gland: armour glands clamp and bond the wires, and bend radius should stay near twelve times overall diameter to avoid tape displacement. Never rely on armour as the sole ground path without calculation.
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