Single-Rod Earthing Resistance Calculator
Declared thin vertical groundrod homogeneous-halfspace approximationρ/(2πL)[ln(4L/d)−1], diameter d, embedded L, d/L≤.1. Not layered ground, bonding/step touch limits, multiple rods, electrical-code compliance or safe earthing approval.
Description
Single-rod earthing models relate soil resistivity to embedded rod geometry.
Single-rod earthing models relate soil resistivity to embedded rod geometry.1
The thin-rod, uniform-soil approximation leaves layered soil and interactions with other electrodes outside its scope. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Single-Rod Earthing Resistance Calculator
Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the independently reviewed engineering model, geometry, material properties, units and governing reference edition.
How to use Single-Rod Earthing Resistance Calculator and understand its results
- Establish the independently reviewed engineering model, geometry, material properties, units and governing reference edition.
- Enter callerMatchedUniformSoilResistivityOhmMeters, actualRodEmbeddedLengthMeters, actualRodDiameterMeters, using the field meanings and rules below, then run the tool.
- Read result.conditionalSingleRodResistanceOhms. Interpret each field using the units, signs and evidence rules below.
- If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerMatchedUniformSoilResistivityOhmMeters | Caller matched uniform soil resistivity ohm meters | number | Required |
| actualRodEmbeddedLengthMeters | Actual rod embedded length meters | number | Required |
| actualRodDiameterMeters | Actual rod diameter meters | number | Required |
Require nonnegative matched uniform soil resistivity in ohm-meters and positive embedded length and diameter in meters. Require diameter/length≤0.1, allowing the boundary. Calculate rho/(2piL)×(ln(4L/d)−1) in ohms. Zero resistivity is accepted; the tool does not add layered-soil, contact or mutual-electrode models.
singleRodResistanceOhms=rhoOhmMeters/(2pi×lengthMeters)×[ln(4×lengthMeters/diameterMeters)−1] Apply the field units and exact ordering, boundary and evidence rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result containing the calculation or selected reference fields below | object |
| result.conditionalSingleRodResistanceOhms | Conditional Single Rod Resistance Ohms; use the units, sign convention and calculation stated above | number |
{
"input": {
"callerMatchedUniformSoilResistivityOhmMeters": 100,
"actualRodEmbeddedLengthMeters": 2,
"actualRodDiameterMeters": 0.02
},
"output": {
"result": {
"conditionalSingleRodResistanceOhms": 39.720812797009195
}
}
}Limitations and assumptions
The thin-rod, uniform-soil approximation leaves layered soil and interactions with other electrodes outside its scope. Results depend on the independently established measurement basis and the exact model assumptions above.
Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.
Alternative or Complementary methods
Use Lightning Risk Factor Calculator to examine a related aspect: Lightning risk assessment combines exposure, structure characteristics, loss categories and protective measures.
Use Bolt Preload Torque Calculator where its separate inputs and scope apply: A nut-factor torque model estimates tightening torque from preload and bolt diameter.
References
Similar or alternative tools
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