Grounding Grid Design: DECREMENT_FACTOR
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 | limiting value | notes | unit |
|---|---|---|---|---|
| DECREMENT_FACTOR | FAULT_DUR_0.08S_X_R_10 | 1.65 | X/R=10; Df per IEEE 80 Table 13.1 | dimensionless |
| DECREMENT_FACTOR | FAULT_DUR_0.1S_X_R_10 | 1.58 | X/R=10 | dimensionless |
| DECREMENT_FACTOR | FAULT_DUR_0.1S_X_R_20 | 1.76 | X/R=20 | dimensionless |
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