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Grounding Electrode for AC Systems
Table 250-66
Copper Service-Entrance Conductors
Size of Largest Service-Entrance Conductor or
Equivalent Area for Parallel Conductorsa
Size of Grounding Copper Electrode Conductor
 Size of Grounding Aluminum Electrode Conductorb
Aluminum Service-Entrance Conductors
Size of Largest Service-Entrance Conductor or
Equivalent Area for Parallel Conductorsa
Size of Grounding Copper Electrode Conductor
 Size of Grounding Aluminum Electrode Conductorb
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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