Build my own cabin - DIY projects

NEC 2005: Table 250.66

 

Grounding Electrode Conductor for AC systems
Size of Largest Ungrounded Service Entrance Conductor*  (AWG/kcmil) Size of Grounding Electrode Conductor (AWG/kcmil)
Copper Aluminum Copper Aluminum
2 or smaller 1/0 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
*or Equivalent Area for Parallel Conductors

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