The design of a 66kV cable trench is vital for the long-term reliability and safety of the installation. Key factors include:

• Trench Dimensions: The width and depth must be adequate to accommodate the cables and ensure proper clearances, preventing thermal interference and mechanical stress.

• Cable Bedding and Backfill: The material surrounding the cable must have a low thermal resistivity to effectively dissipate heat generated by the cable. Materials like crushed limestone or granite dust are commonly used for this purpose.

• Cable Protection: Warning tapes, concrete slabs, or bricks are installed above the cable to prevent accidental damage during future excavation work.

• Clearance from Other Utilities: Strict separation distances must be maintained from other services like gas, water, and telecommunications to comply with safety standards.