Soil Resistivity Profiling & Low-Impedance Earth Grid Design (IEEE 80)

Step and touch potential safety calculations for 33kV substation earth mats in high-resistivity soils.

1. Wenner 4-Point Soil Resistivity Survey

Accurate multi-depth apparent resistivity testing is mandatory for grounding design. High water table fluctuations in tropical soils require deep driven chemical earth rods and exothermic weld bonded copper grids.

2. Step & Touch Voltage Compliance

Under a maximum phase-to-ground fault current (e.g. 25 kA for 1 second), ground potential rise (GPR) must not create lethal surface voltage gradients. Crushed rock surfacing and perimeter ring conductors limit potential hazards to personnel.

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