Professional Answer: The required burial depth varies significantly based on the cable's voltage, whether it is installed directly in the ground or in a conduit, and the location of the trench (e.g., under a footpath, road, or open ground). As a general guideline, low-voltage (LV) cables are often buried at a minimum depth of 450-750 mm, while high-voltage (HV) cables require a deeper burial of 750-1200 mm or more for enhanced safety and protection. For locations with heavy vehicle traffic, such as roads or driveways, the depth must be increased, and cables are typically encased in protective ducts and concrete for maximum mechanical protection. We provide a full range of equipment, from trenchers to cable pullers, designed to facilitate compliance with these varying depth requirements.