What is the purpose of using armoured or ducting for cables in external or buried sections?

• A. To provide mechanical protection from physical damage and moisture.
• B. To improve aesthetics.
• C. To reduce conduit cost.
• D. To allow easier heat dissipation.

Answer: (C)

The main idea is to keep cables safe where they’re exposed to the elements or buried underground. Armoured cables have a metal sheath that resists impacts, digging, abrasion, and physical damage, so the insulation and conductors stay protected. Ducting (a protective conduit) provides a sealed, sturdy passage for the conductors, shielding them from soil moisture and water ingress while making installation and future repairs easier. Together, they address the real hazards of outdoor or buried runs. Aesthetics, lowering cost, or improving heat dissipation aren’t the primary reasons; in fact, ducts and armour are chosen for protection and longevity in challenging locations.