Estimates the touch voltage that could appear on exposed conductive parts from an unbalanced neutral or earth-fault current flowing through a ground-path impedance, and compares it against IEC 60364-4-41's conventional touch-voltage limits (50V dry/normal, 25V wet/conductive locations).
Standards followed
IEC 60364-4-41 (protection against electric shock)IEC 60479-1 (commonly-cited 1000Ω reference body resistance, used only for the contextual body-current estimate)
What it can do
- Ground potential rise from the imbalance current and ground-path impedance.
- Touch voltage from an adjustable touch-voltage factor (fraction of GPR appearing across the body — geometry/site dependent).
- Pass/fail against the IEC 60364-4-41 limit for the selected environment.
- Contextual estimated body current using the commonly-cited 1000Ω reference body resistance.
Example problem
15A imbalance current, 2Ω ground path, touch factor 1.0 (worst case), dry environment.
- Ground potential rise = 15 × 2 = 30V.
- Touch voltage = 30 × 1.0 = 30V.
- Dry limit = 50V → 30V ≤ 50V, pass.
Pass, with an estimated body current of ≈30mA for context.
Want the full step-by-step version?
The touch-voltage factor is genuinely site/geometry dependent (soil resistivity, bonding, distance from the grounding point) — 1.0 is the conservative worst case; a real assessment should use a proper ground-potential-rise study or measurement for the specific location.