Online Calculators and Tables to Help You Determine Proper Wire Size
This table lists the minimum sizes of grounding conductors for grounding raceways and equipment.
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Ground Wire Size Table
| Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc. Not Exceeding (Amperes) | Copper (AWG or kcmil) | Aluminum (AWG or kcmil) |
|---|---|---|
| 60 | 10 | 8 |
| 100 | 8 | 6 |
| 200 | 6 | 4 |
| 300 | 4 | 2 |
| 400 | 3 | 1 |
| 500 | 2 | 1/0 |
| 600 | 1 | 2/0 |
| 800 | 1/0 | 3/0 |
| 1000 | 2/0 | 4/0 |
| 1200 | 3/0 | 250 |
| 1600 | 4/0 | 350 |
| 2000 | 250 | 400 |
| 2500 | 350 | 600 |
| 3000 | 400 | 600 |
| 4000 | 500 | 800 |
| 5000 | 700 | 1200 |
| 6000 | 800 | 1200 |
Note: View wire size charts from the list below.
Maximum Allowable Ampacities for Conductors in Raceway, Cable or Earth (30°C)
Maximum Allowable Ampacities for Conductors in Free Air (30°C)
Maximum Allowable Ampacities for Conductors in Raceway, Cable or Earth (40°C)
Maximum Allowable Ampacities for Conductors in Free Air (40°C)
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