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| Home > Industry Tables & Calculators > Service Equipment Grounding Table |
 Service Equipment Grounding Table |
Table 250.66 Grounding Electrode Conductor
for Alternating-Current System |
Size of Largest Ungrounded
Service-Entrance Conductor
or Equivalent Area for
Parrell Conductorsa
(AWG/kcmil) |
Size of Grounding
Electrode Conductor
(AWG/kcmil) |
| Copper |
Aluminum or
Copper-Clad
Aluminum |
Copper |
Aluminum or
Copper-Clad
Aluminum |
| 2 or smaller |
1 or smaller |
8 |
6 |
| 1 or 1/0 |
2/0 or 3/0 |
6 |
4 |
| 2/0 or 3/0 |
4/0 or 250 |
4 |
2 |
Over 3/0
through 350 |
Over 250
through 500 |
2 |
1/0 |
Over 350
through 600 |
Over 500
through 900 |
1/0 |
3/0 |
Over 600
through 1100 |
Over 900
through 1750 |
2/0 |
4/0 |
| Over 1100 |
Over 1750 |
3/0 |
250 |
Notes:
1. Where multiple sets of service-entrance conductors are used as permitted in 230.40, Exception No.2, the equivalent size of the largest service-entrance conductor shall be determined by the largest sum of the areas of the corresponding conductors of each set.
2. Where there are no service-entrance conductors, the grounding electrode conductor size shall be determined by the equivalent size of the largest service-entrance conductor required for the load to be served.
aThis table also applies to the derived conductors of seperately derived ac systems.
bSee installation restrictions in Section 250-64(A). |
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