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Grounding Conductor Size Selector Table 250-122 Calculator by electrician2.com Select Rating or setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, conduit, etc. Not Exceeding (Amperes) 15 Amperes 20 Amperes 30 Amperes 40 Amperes 60 Amperes 100 Amperes 200 Amperes 300 Amperes 400 Amperes 500 Amperes 600 Amperes 800 Amperes 1000 Amperes 1200 Amperes 1600 Amperes 2000 Amperes 2500 Amperes 3000 Amperes 4000 Amperes 5000 Amperes 6000 Amperes Size of copper grounding conductor Size of Aluminum grounding conductor