One type of cable suitable for installation in soil with a high impact resistance pipe in an industrial or commercial building and state minimum burial depth?

One type of cable suitable for installation in soil with a high impact resistance pipe in an industrial or commercial building and state minimum burial depth?

• A. SWA; buried at least 450 mm
• B. NYY; buried 300 mm
• C. PVC; buried 100 mm
• D. LSF; buried 600 mm

Answer: (A)

The key idea is providing mechanical protection for underground cables in demanding industrial or commercial environments. Steel Wire Armoured (SWA) cable has a steel armour that guards the conductors from physical impact, moisture, and damage when buried in soil or installed in protective ducts. That armour makes it suitable for direct burial in soil, even where a heavy-duty protective pipe is present, because it resists crushing and disturbance. The minimum burial depth of about 450 mm is chosen to keep the cable well below the area likely to be disturbed by surface loads and activities, providing reliable protection in an industrial setting. The other cable types either lack armour or rely on insulation and sheathing alone, which don’t offer the same level of mechanical protection for direct burial, and the stated depths either don’t meet the protection needs or aren’t appropriate for direct underground installation.

The key idea is providing mechanical protection for underground cables in demanding industrial or commercial environments. Steel Wire Armoured (SWA) cable has a steel armour that guards the conductors from physical impact, moisture, and damage when buried in soil or installed in protective ducts. That armour makes it suitable for direct burial in soil, even where a heavy-duty protective pipe is present, because it resists crushing and disturbance. The minimum burial depth of about 450 mm is chosen to keep the cable well below the area likely to be disturbed by surface loads and activities, providing reliable protection in an industrial setting. The other cable types either lack armour or rely on insulation and sheathing alone, which don’t offer the same level of mechanical protection for direct burial, and the stated depths either don’t meet the protection needs or aren’t appropriate for direct underground installation.