The required depth for burying electrical cables in a trench varies by region and voltage level. However, a general guideline is as follows:

• Low Voltage (LV) cables (< 1kV): Typically buried at a minimum depth of 450-750 mm (18-30 inches).

• Medium/High Voltage (MV/HV) cables (> 1kV): Buried deeper, typically 750-1200 mm (30-48 inches). Under roads or driveways, depths are often increased, and cables are always installed within protective ducts. The trench should also have a bedding layer of fine soil or sand to protect the cable from sharp rocks and provide a good thermal environment.