Earthing System Resistance Estimate
Basis of the result without GIM: BS 7430:2026
Selected parameters
- Layout
- Earth rods in a row
- Soil type
- Porous sandstone — 100 Ω·m
- Soil resistivity
- 100 Ω·m
- Drawing shows
- Without GIM
- GIM product
- KALOT GIM
- Buried conductor
- 6 m
- Conductor type
- Round copper wire 8 mm
- Earth rods
- 2 × 3 m
- Earth-rod diameter
- 16 mm
- Conductor burial depth
- 0.75 m
- Earth-rod spacing
- 6 m
- Earth-rod bonding
- By the buried conductor
Schematic view: Earth rods in a row
The drawing is schematic and not to scale; the written dimensions are the design basis.
- Earth rod, plate or pipe
- Buried conductor
- Conductive backfill
Final estimated resistance, with and without GIM
Without GIM (BS 7430:2026): 12.33 Ω
With KALOT GIM (GIM): 8.72 Ω
Total resistance of the bonded system.
Basis without GIM: BS 7430:2026, clauses 8.5.3 to 8.5.8 + numerical interaction model. Earth-rod part 18.07 Ω and buried conductor 21.47 Ω. Their mutual effect is calculated with a potential matrix in homogeneous soil. This combination is an engineering model and must be checked by a field test and a review by our technical team.
Materials for this design
No allowance for waste or overlap
| Item | Quantity |
|---|---|
| Earth rod 3 m, diameter 16 mm | 2 pcs |
| Round copper wire 8 mm | 6 m minimum |
| Electrical connection point (weld or suitable clamp) | 2 points |
| Item | Quantity |
|---|---|
| Earth rod 3 m, diameter 16 mm | 2 pcs |
| Round copper wire 8 mm | 6 m minimum |
| Electrical connection point (weld or suitable clamp) | 2 points |
| GIM around the earth rods, 15 cm hole | 8 bags (4 per earth rod) |
| GIM in the trench, 10 × 10 cm section | 4 bags |
| KALOT GIM, 15 kg bag | 12 bags |
| Mixing water for GIM | 96 L |
| Cement for mixing GIM | 24 kg |
These results are estimates. For use in a project they must be reviewed with our engineers and recalculated precisely for that project.
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