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Grid resistance, ground potential rise and tolerable touch/step limits per IEEE Std 80, plus BS 7430 electrode sizing. Mesh/step voltage (the pass/fail safety check), two-layer soil, parallel electrodes and transferred potential are subscriber features.
AAJappsEngineering Calculation Report
Earthing Grid Design Calculator
IEEE Std 80, BS 7430
Generated
For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.
Soil model
Ω·m
m
Wenner 4-pin / two-layer soil model
Subscriber
A uniform single-resistivity soil model (left) is used for all free-tier calculations. Layered soil modelling refines the effective resistivity seen by the grid for sites with real stratified ground.
Fault & protection
A
s
Grid geometry
m
m
m
m
m
Conductor sizing (BS 7430 / IEEE 80)
Single electrode resistance (BS 7430)
m
m
Single electrode resistance RE33.493 Ω
Parallel electrode system
Subscriber
m
Parallel system resistance9.142 Ω
Transferred potential (offsite hazard)
Subscriber
Not yet implemented in this calculator — this section describes the IEEE 80 §17 transferred-potential check but doesn't compute it yet. Applies when a metallic conductor crosses the grid boundary and could carry the ground potential rise largely undiminished to someone standing on true remote earth; treat any such crossing as a hazard to review manually against §17 until this is built.
Grid design assistant
Subscriber
Not yet implemented in this calculator — mesh/step voltage checking itself (above) is now unlocked, but this auto-search assistant for a compliant spacing hasn't been built yet. Adjust grid geometry manually and re-check the mesh/step result in the panel to the right.
Quick results
Grid resistance Rg
2.2851 Ω
Sverak formula · IEEE 80 Eq. 57
Ground potential rise GPR
22,850.7 V
IG × Rg = 10,000 × 2.2851
Tolerable touch voltage
188.7 V
Tolerable step voltage
262.5 V
Minimum conductor size
31.3 mm²
Adiabatic · IEEE 80 / BS 7430
Mesh & step voltage
Mesh voltage Em
FAIL
6,813.0 V
Tolerable Etouch = 188.7 V
Step voltage Es
FAIL
2,650.9 V
Tolerable Estep = 262.5 V
✕ Grid does NOT satisfy IEEE 80 — increase conductor density, add ground rods, or reduce soil resistivity.