Which statement best describes twin-and-earth cable usage?

• A. It is used only for data transmission
• B. It consists of two cores plus an outer shield
• C. It uses armor for outdoor use
• D. It is copper conductor used for fixed lighting and power circuits

Answer: (D)

Twin-and-earth cable is a simple fixed-wiring cable designed for building installations. It has two insulated copper conductors (live and neutral) plus an earth conductor, all enclosed in a single outer sheath. This arrangement is meant for permanent wiring, making it well suited to feed lighting and general power circuits inside premises. It’s not used for data transmission, nor is it inherently shielded or armored in its standard form; armor or shielding variants exist only in special cases. So describing it as copper conductor used for fixed lighting and power circuits best fits its typical use and construction.