NEC 250.122

NEC 250.122

Minimum size equipment grounding (bonding) conductor.

Protection Rating Copper Conductor
15A 14 AWG
20A 12 AWG
30A – 60A 10 AWG
70A – 100A 8 AWG
110A – 200A 6 AWG
225A – 300A 4 AWG
350A – 400A 3 AWG
450A – 500A 2 AWG
600A 1 AWG
800A – 800A 1/0 AWG
1,000A 2/0 AWG
1,200A 3/0 AWG