Grounding Grid Design: TOUCH_VOLTAGE_LIMIT
IEEE 80 grounding grid design parameters including touch/step voltage safety limits (50 and 70 kg body weight), decrement factors by X/R ratio, and typical soil resistivity values by soil type.
| parameter type | condition | body weight kg (kg) | decrement factor (dimensionless) | limiting value | notes | unit |
|---|---|---|---|---|---|---|
| TOUCH_VOLTAGE_LIMIT | 50KG_BODY_0.1S | 50 | 1 | 116 | ts=0.1s fault clearing; Vs_touch=1000*(Ib*Zth) approx | V |
| TOUCH_VOLTAGE_LIMIT | 50KG_BODY_0.25S | 50 | 1 | 77.9 | ts=0.25s | V |
| TOUCH_VOLTAGE_LIMIT | 50KG_BODY_0.5S | 50 | 1 | 62.5 | ts=0.5s | V |
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