Trench depth is a critical safety and performance factor that varies based on voltage and location. For Low Voltage (LV) cables (less than 1kV), the typical depth ranges from 450-750 mm. For Medium/High Voltage (MV/HV) cables (greater than 1kV), the depth is typically 750-1200 mm or deeper. Under roadways, these depths are often increased, and cables are placed in protective ducts.