What is the minimum burial depth for a non-armoured cable installed in soil?

What is the minimum burial depth for a non-armoured cable installed in soil?

• A. 450 mm below the surface
• B. 150 mm
• C. 300 mm
• D. 600 mm below the surface

Answer: (A)

Direct burial of a non-armoured cable requires enough depth to protect the insulation from accidental contact and digging, since there’s no outer armour to resist impact. The standard minimum depth for this type of installation is 450 mm below the surface. This depth helps guard against garden tools, root growth, and shallow cultivation, reducing the chance of damage. If the cable were armoured or placed in a protective conduit, a shallower depth (around 300 mm) might be acceptable, but for non-armoured direct burial in soil, 450 mm is the typical requirement. Deeper depths, like 600 mm, are used in higher-risk locations such as under roads or in areas with greater mechanical disturbance.

Direct burial of a non-armoured cable requires enough depth to protect the insulation from accidental contact and digging, since there’s no outer armour to resist impact. The standard minimum depth for this type of installation is 450 mm below the surface. This depth helps guard against garden tools, root growth, and shallow cultivation, reducing the chance of damage. If the cable were armoured or placed in a protective conduit, a shallower depth (around 300 mm) might be acceptable, but for non-armoured direct burial in soil, 450 mm is the typical requirement. Deeper depths, like 600 mm, are used in higher-risk locations such as under roads or in areas with greater mechanical disturbance.