What this covers
- Soil resistivity interpretation — deriving a layered soil model from measured field data.
- Earth grid design — conductor layout, spacing, depth and rod arrangement.
- Step and touch voltage — calculated against tolerable limits for the fault duration and surface layer used.
- Ground potential rise — magnitude and the transferred potential implications for incoming services and communications.
- Conductor sizing — thermal sizing of earth conductors for the fault duty and duration.
- Earthing arrangement — solid, resistance or resonant earthing and the fault current each produces.
- Lightning and surge — coordination with lightning protection and surge arrester earthing.
What you receive
- Earthing design report with the soil model and calculation basis
- Earth grid layout drawings
- Step, touch and ground potential rise calculations against tolerable limits
- Conductor sizing calculations
- Test and verification requirements for commissioning
Standards and references
Design is carried out to IEEE 80 for substation earthing and IEC 61936-1 for AC installations above 1 kV, with soil measurement to IEEE 81 and conductor sizing to IEC 60949.
Related services
Load Flow Analysis
Steady-state studies of voltage profile, power distribution and loading across the network.
Short Circuit Analysis
Fault current calculations to verify equipment ratings and underpin protection coordination.
Arc Flash Studies
Incident energy analysis and PPE categories to protect people working on live equipment.
Need earthing system design scoped?
Work directly with the engineers doing the analysis — clear scoping from the first conversation.
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