When installing cables for external or buried sections, what protection is typically used?

• A. Armoured cable or conduit with proper gland entries.
• B. Unarmoured single-core cable without protection.
• C. Direct burial of flexible cords.
• D. Open run of conductors with no protection.

Answer: (B)

When runs are outside the building or buried underground, cables must be protected from moisture, dirt, and physical damage. The standard approach is to place the conductors inside a protective barrier such as armoured cable or a conduit system. The armour or conduit shields the wires, while properly rated gland entries at terminations seal and secure the connection, keeping moisture out and providing strain relief. Using unarmoured single‑core cable, direct burial of flexible cords, or leaving conductors exposed would leave the installation vulnerable to damage and environmental conditions, which is not acceptable for external or buried sections.