A professional underground electrical installation is a multi-step process that demands meticulous planning, precision, and the right tools to ensure safety and long-term reliability.

1. Site Survey and Planning: Before any digging, a comprehensive site survey is performed to identify the cable route. This includes locating existing underground utilities (e.g., gas, water) by calling the local utility marking service. A detailed plan outlines the trench depth, route, and locations for manholes or vaults.

2. Excavation and Conduit Laying: Trenches are dug to the specified depth, which varies based on local regulations and the type of cable/conduit. Once the trench is ready, a protective layer of sand is laid at the bottom. The conduit or duct system is then assembled and laid in the trench.

3. Cable Pulling: This is the most critical and equipment-intensive step. A pulling rope is fed through the conduit using a duct rodder or a cable snake. The cable is then attached to the rope using a Swivel and pulling grip and is pulled through the conduit using a hydraulic cable puller or winch. This process requires a controlled, steady force to avoid damaging the cable.

4. Terminating and Splicing: At the ends of the run, the cable is terminated and connected to switchgear or transformers using specialized termination kits. Where two cable sections must be joined, a splice kit is used to create a durable, waterproof connection.

5. Backfilling and Restoration: Once the cables are installed and tested, the trench is backfilled and compacted in layers to prevent future ground settling. A warning tape is often buried a few inches below the surface to alert anyone who might dig in the area in the future. The site is then restored to its original condition.