Nec Grounding: 250.66
NEC Table 250.122 — minimum equipment grounding conductor sizes based on overcurrent protective device rating
| nec table | record id | grounding electrode conductor al | grounding electrode conductor cu | service entrance conductor al | service entrance conductor cu | table title |
|---|---|---|---|---|---|---|
| 250.66 | 250.66-1 | 6 AWG | 8 AWG | 1/0 AWG or smaller | 2 AWG or smaller | Grounding Electrode Conductor for AC Systems |
| 250.66 | 250.66-2 | 4 AWG | 6 AWG | 2/0 AWG or 3/0 AWG | 1 AWG or 1/0 AWG | Grounding Electrode Conductor for AC Systems |
| 250.66 | 250.66-3 | 2 AWG | 4 AWG | 4/0 AWG or 250 kcmil | 2/0 AWG or 3/0 AWG | Grounding Electrode Conductor for AC Systems |
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