Size of largest ungrounded service entrance conductor awg kcmil size of grounding electrode conductor awg kcmil. Where the grounding electrode conductor is connected to a single or multiple rod pipe or plate electrode s or any combination thereof as permitted in 250 52 a 5 or a 7 that portion of the conductor that is the sole connection to the grounding electrode s shall not be required to be larger than 6 awg copper wire or 4 awg. The size of the grounding electrode conductor of a grounded or ungrounded ac system shall not be less than given in table 250 66.
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