How is ground rod resistance calculated?

For a single vertical rod: R = ρ/(2πL) × ln(4L/d), where ρ is soil resistivity (Ω·m), L is rod length (m), and d is rod diameter (m). This formula assumes a uniform soil model.

What is acceptable grounding resistance?

Typical targets: <5 application.

How do parallel rods reduce resistance?

Parallel rods reduce total resistance, but not proportionally due to mutual interference. For N rods spaced at distance s: R_total ≈ R_single/N × (1 + interaction factor). Rods should be spaced at least 2× rod length apart for best efficiency.

What are typical soil resistivity values?

Wet clay: 10-100 Ω·m. Loam/garden soil: 50-200 Ω·m. Sand: 200-3000 Ω·m. Gravel: 3000-10000 Ω·m. Rock: 10000+ Ω·m. Soil resistivity varies greatly with moisture, temperature, and mineral content.

How do I measure soil resistivity?

The Wenner four-pin method is most common: four equally-spaced probes driven into the ground. A current is passed through the outer probes and voltage measured across the inner probes. ρ = 2πaR, where a is probe spacing and R is measured resistance.

मुक्त अभियांत्रिकी साधन

ग्राउंडिंग कॅल्क्युलेटर

R = ρ/(2πL) × ln(4L/d) वापरून ग्राउंड रॉड प्रतिरोध मोजा. एकेरी आणि समांतर रॉड संरचनांना समर्थन.

IEEE 80एकेरी / समांतर रॉड्समातीचा प्रतिरोधांक

Results

एकूण ग्राउंड प्रतिरोध

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एकेरी रॉड प्रतिरोध

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संरचना

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स्थिती

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एकेरी रॉड प्रतिरोध

मातीच्या प्रतिरोधांकाचा संदर्भ

मातीचा प्रकार	ρ (Ω·m)
ओलसर चिकणमाती	10–100
लोम / बागेची माती	50–200
वाळू	200–3000
खडी	3000–10000
खडक	10000+

Grounding Calculator — Ground Rod Resistance | Vibromera

Published by Nikolai Shelkovenko on फेब्रुवारी 15, 2026 एप्रिल 5, 2026

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एकेरी रॉड प्रतिरोध

मातीच्या प्रतिरोधांकाचा संदर्भ

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