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Grounding Grid Design: DECREMENT FACTOR
FAULT DUR 1.0S X R 10 to FAULT DUR 1.0S X R 40
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 | standard | unit |
|---|---|---|---|---|
| DECREMENT FACTOR | FAULT DUR 1.0S X R 10 | 1.05 | IEEE Std 80-2013 | dimensionless |
| DECREMENT FACTOR | FAULT DUR 1.0S X R 20 | 1.09 | IEEE Std 80-2013 | dimensionless |
| DECREMENT FACTOR | FAULT DUR 1.0S X R 40 | 1.12 | IEEE Std 80-2013 | dimensionless |
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