Conversion using the Ground Wire Size Calculation Formula
National Electrical Code Table 250.122 determines the minimum required sizes of the ground conductor based on circuit breaker ratings. The general guideline is:
- A_ground = Ground conductor cross-sectional area (mm² or AWG)
- I_fault = Maximum fault current (Amps)
- K = Material-dependent constant (based on copper or aluminum)
Where:
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Ground Wire Size conversion chart
Amperage (A) | Copper Wire Size (AWG) | Aluminum Wire Size (AWG) |
---|---|---|
10 | 10 AWG | 8 AWG |
15 | 14 AWG | 12 AWG |
20 | 12 AWG | 10 AWG |
30 | 10 AWG | 8 AWG |
40 | 8 AWG | 6 AWG |
50 | 6 AWG | 4 AWG |
60 | 6 AWG | 4 AWG |
70 | 4 AWG | 2 AWG |
80 | 4 AWG | 2 AWG |
100 | 2 AWG | 1 AWG |
150 | 1 AWG | 1/0 AWG |
200 | 1/0 AWG | 2/0 AWG |