This table lists the minimum sizes of grounding conductors for grounding raceways and equipment.

Ground Wire Size Table

Source: NFPA 70, National Electrical Code, Table 250-95
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.


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