Requirements for Proper Earthing (Grounding)

 Requirements for Proper Earthing (Grounding)

📌 What is Earthing?

Earthing (Grounding) is the process of connecting electrical equipment to the earth so that fault current safely flows into the ground and prevents electric shock, fire, and equipment damage.

✅ Requirements for Proper Earthing

Low Earth Resistance

Residential: ≤ 5 ohms

Industrial: ≤ 1 ohm

Sensitive equipment: ≤ 0.5 ohm

Good Earthing Electrode

Copper rod / GI rod / plate

Installed deep (2–3 meters or more)

Good Soil Condition

Moist soil is best

Charcoal, salt, or bentonite can be used

Proper Earth Conductor

Correct size copper/GI wire

No loose joints or corrosion

Separate Earthing

Separate earthing for:

Power equipment

Lightning protection

Instruments

Regular Testing

Earth resistance must be checked periodically

🧠 Example

If a welding machine insulation fails, the fault current flows to the earth, not through the worker’s body — life is saved.

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