मुफ्त ग्राउंड रॉड गहराई कैलकुलेटर
अर्थिंग रॉड की सही गहराई निकालें। मिट्टी की प्रतिरोधकता और मानक के अनुसार गहराई की गणना करें।
Ground Resistance
0.0 ohms
Ground Resistance vs Soil Resistivity
सूत्र
Ground Rod Resistance
R = (rho / (2 x pi x L)) x ln(4L / a)
Where rho is soil resistivity in ohm-meters, L is the rod driven depth in meters, and a is the rod radius in meters. The NEC requires a single ground rod to achieve 25 ohms or less; otherwise a second rod is required.
हल किया गया उदाहरण
8-ft ground rod (5/8 in diameter) in 100 ohm-m soil.
- 01L = 8 x 0.3048 = 2.438 m
- 02a = 0.3125 x 0.0254 = 0.00794 m
- 03R = 100 / (2 x pi x 2.438) x ln(4 x 2.438 / 0.00794)
- 04R = 6.527 x ln(1228) = 6.527 x 7.11 = 46.4 ohms
- 05Exceeds 25 ohms; install a second rod at least 6 ft away.
अक्सर पूछे जाने वाले प्रश्न
What does soil resistivity depend on?
Soil resistivity varies with moisture, temperature, mineral content, and soil type. Wet clay may be 10-50 ohm-m, while dry sand or rock can exceed 1,000 ohm-m.
What if one rod does not meet 25 ohms?
The NEC (250.56) requires a supplemental ground electrode if the first rod exceeds 25 ohms. Two rods are always acceptable regardless of resistance.
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