Answer: At Ningbo Changshi, we understand that selecting the correct installation method is critical for the longevity and reliability of the power system. The primary methods for laying 11kV underground cables include:

• Direct Laying: This is the most common and cost-effective method. It involves burying the cable directly in a trench. A fine sand bed is used to protect the cable from moisture and mechanical damage, followed by a layer of protective bricks or tiles.

• Draw-in System: Cables are pulled through pre-installed ducts or conduits, typically made of concrete or steel. This method is preferred in urban areas with high congestion of other utilities and allows for easier replacement or maintenance in the future.

• Trough Laying: Cables are laid in pre-cast concrete or fiberglass troughs, which are then covered. This method offers excellent protection and is often used in substations or industrial environments.