Grounding & Lightning

Earthing Resistance

Calculate the ground resistance of a single vertical rod using Dwight's formula. Includes IEC 60364 / IEC 62305 compliance check.

Standards: IEC 60364-5-54 IEC 62305 BNBC

Earthing Resistance — Single Rod

Calculate the ground resistance of a single vertical rod using Dwight's formula. Used for LPS earthing design and general electrical earthing verification per IEC 62305 and BNBC.

Soil resistivity (ρ)

Use a measured value from a soil test for accuracy.

Rod length

Common values: 1.5 m, 2.4 m, 3 m.

Rod diameter

Number of rods in parallel

rods

Rods should be spaced ≥ 2× rod length apart for this formula to apply.

Results will appear here after you calculate.

For estimation purposes only. Results are indicative and based on simplified engineering models. Always consult a qualified engineer before making design or investment decisions. Sustech Technology Ltd accepts no liability for decisions made based on these calculations.

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