Grounding Electrode Calculator
Size grounding electrodes and conductors per NEC 250
Ground Rod Estimation
Enter if known from fall-of-potential test
Grounding Requirements
Grounding Electrode Conductor
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Ground Rods Required
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Estimated Resistance (single rod)
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NEC Resistance Limit
25 Ω
Bonding Jumper Size
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NEC 250.66 - GEC Sizing
| Service Conductor (Cu) | GEC Copper | GEC Aluminum |
|---|---|---|
| 2 AWG or smaller | 8 AWG | 6 AWG |
| 1 AWG - 1/0 AWG | 6 AWG | 4 AWG |
| 2/0 - 3/0 AWG | 4 AWG | 2 AWG |
| Over 3/0 - 350 kcmil | 2 AWG | 1/0 AWG |
| Over 350 - 600 kcmil | 1/0 AWG | 3/0 AWG |
| Over 600 - 1100 kcmil | 2/0 AWG | 4/0 AWG |