ECN Forum Forums Code Related Discussion NEC & other Code issues Grounding electrode from inside subpanel??

250.66
States The size of the grounding electrode conductor of a Grounded or ungrounded ac system (SHALL) not be less then given in Table 250.66 (EXCEPT) as permitted in 250.66 (A) though (C).
A = connections to Rod, Pipe, or Plate. # 6 copper
B Concrete cased electrodes # 4 copper
C Ground rings not larger then required by ground ring.
All others must compy with table such as water lines, building steel ect.\

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