About Lesson
Installation Practices
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Excavation
- Trenching: Excavate trenches for laying grounding conductors and creating the grounding grid.
- Depth: Typically, grounding conductors are buried at a depth of 0.5 to 1 meter to ensure stability and protection from physical damage.
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Laying Conductors
- Grid Formation: Lay conductors in a grid pattern with intersections bonded securely.
- Connections: Use exothermic welding, crimping, or bolted connections to ensure low-resistance and durable joints.
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Electrode Installation
- Driving Electrodes: Drive rod electrodes into the ground at specified intervals to achieve the desired grounding resistance.
- Backfill Materials: Use conductive backfill materials like bentonite to enhance electrode performance.
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Bonding and Connections
- Bonding Jumpers: Install bonding jumpers to connect metallic structures and equipment to the grounding grid.
- Testing: Perform continuity and resistance tests to verify the integrity of connections.
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Inspection and Testing
- Initial Testing: Conduct earth resistance testing using methods like the fall-of-potential test.
- Periodic Testing: Regularly inspect and test the earthing system to ensure continued performance.