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LPI Earthing Calculator

Important notes

  • This calculator provides estimates of earth electrode resistance and, importantly, the reduction in earth resistance achieved when using LPI’s RESLO and SRIM PLUS “earth enhancing compounds” (EEC). It provides the estimated number of 20 kg bags of EEC required.
  • This calculator is not intended to be used to produce an engineered earthing design. For such designs, please contact LPI.
  • “No EEC” assumes relatively undisturbed native soil around the electrode, i.e., a driven rod or horizontal electrode with compacted soil.

Global input

Horizontal Radials

Horizontal Radials Layout
Number of Bags of EEC
Earth Resistance (Ω)
No EEC
RESLO-20
SRIMPLUS-20

Vertical Earth Rods

Vertical Earth Rod Layout
Number of Bags of EEC
Earth Resistance (Ω)
No EEC
RESLO-20
SRIMPLUS-20

LPI Crow’s Foot Earth Grid

Crow's Foot Earth Grid Layout
Number of Bags of EEC
Earth Resistance (Ω)
No EEC
RESLO-20
SRIMPLUS-20

Constants

Electrode burial depth (mm)
500
Height of compound in trench (m)
0.03
Volume of 1 bag of EEC (m³)
0.0222
ρRESLO (Ωm)
0.53
ρSRIMPLUS (Ωm)
0.1
KRESLO & KSRIMPLUS
Computed dynamically from ρ, trench width, and constants