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 |
| |
(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 |
Reprinted with permission from NFPA
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.
| Appendix Sheet 7 |
Cable Tray Manual | Cooper |
51
