250.122: Equipment Grounding Conductor (EGC)

Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment.

Source: NEC 2020

The Math Shortcut

Use the Grounding Calculator

Rating/Setting of OCPD (Amps)	EGC Size (Cu)	EGC Size (Al/Cu-Clad Al)
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	3/0	250 kcmil
1600	4/0	350 kcmil
2000	250 kcmil	400 kcmil

Related NEC Tables

Table 250.66: Grounding Electrode (GEC)Table 250.102(C)(1): Bonding Jumper Sizing

Professional Usage

This data is provided for informational purposes only. Always verify with the latest edition of the National Electrical Code (NFPA 70) and consult with a licensed electrical professional or AHJ (Authority Having Jurisdiction) before performing any electrical work.

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