Earthing Resistance ની ગણતરી કેવી રીતે કરવી
Earthing Resistance શું છે?
Measures electrical resistance of grounding system. Low resistance ensures safety by quickly dissipating faults to ground.
પગલું દ્વારા પગલું માર્ગદર્શિકા
- 1Rod length and diameter affect resistance
- 2Soil resistance varies (clay 10, loam 50, sand 1000+ ohms)
- 3Resistance ≈ (ρ ÷ L) × (ln(8L÷d) - 2)
- 4Target <5 ohms for safety (varies by code)
- 5Multiple rods in parallel reduce resistance
Worked Examples
ઇનપુટ
20 ohm rod, 2 meter deep
પરિણામ
5-10ohm
Common Mistakes to Avoid
- ✕Not measuring resistance after installation
- ✕Using single rod in high-resistance soil
Frequently Asked Questions
Why is low earthing resistance critical?
Allows fault current to return safely; high resistance causes dangerous voltages.
How do I improve earthing resistance?
Longer rods, lower soil resistance (add bentonite), multiple rods, better soil moisture.
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