Table 250.122 — Grounding Conductor Size

Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment

Max. circuit
breaker size
Conductor size (AWG or kcmil)
Copper Aluminum or copper-clad aluminum
15#14#12
20#12#10
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#3/0250
1600#4/0350
2000250400
2500350600
3000400600
4000500750
50007001200
60008001200

DISCLAIMER: All tables on this site are based on the 2011 National Electric Code. The law under your local jurisdiction may be different than what is presented here. Check your local jurisdiction's laws before attempting to do electrical work.

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