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Cable Tray Manual Cooper B-Line, Inc
Appendix Sheet 7
Reprinted with permission from NFPA 70-1999, the National Electrical Code®, Copyright© 1998, National Fire
Protection Association, Quincy, MA 02269. This reprinted material is not the complete and official position of the National
Fire Protection Association, on the referenced subject which is represented only by the standard in its entirety.
Table 250.122. Minimum Size Equipment Grounding
Conductors for Grounding Raceways and Equipment
Rating or Setting of Size
Automatic Overcurrent (AWG or kcmil)
Device in Circuit Ahead
of Equipment, Conduit, Aluminum or
etc., Not Exceeding Copper-Clad
(Amperes) Copper Aluminum*
15 14 12
20 12 10
30 10 8
40 10 8
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