Grounding Resistance Calculator

Calculate grounding resistance for various grounding systems — free electrical engineering design tool

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Grounding Type

Type A (HV/EHV)Type B (Transformer)Type C (>300V LV)Type D (≤300V LV)

Resistance Limit

R \u2264 100 \u03A9

With ELCB

R \u2264 500 \u03A9

ELCB InstalledNo

Input Parameters

Soil Resistivity ρ (Ω·m)

Rod Length (m)

Rod Diameter (mm)

Number of Rods

Results

Single Rod Resistance

64.30 \u03A9

Current Ground Resistance

64.30 \u03A9

PASS (Limit: 100.0 \u03A9)

Required Number of Rods

1 rods

Achieved Resistance: 64.30 \u03A9

R = \u03C1 / (2\u03C0L) \u00D7 ln(4L/d)

Parallel: R_total = R_single / (n × η)

η ≈ 0.85 (coupling factor)