Originally Posted By: Greg Fretwell
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What was the ground electrode?
If it was just a rod or two the #6
is all you need but it does need to be in some kind of conduit and if the conduit is metal it must be bonded at both ends.
250.66(A) Connections to Rod, Pipe, or Plate Electrodes. Where the grounding electrode conductor is connected to rod, pipe, or plate electrodes as permitted in 250.52(A)(5) or 250.52(A)(6), that portion of the conductor that is the sole connection to the grounding electrode shall not be required to be larger than 6 AWG copper wire or 4 AWG aluminum wire.
The strange thing is you still have to "bond" a metal cold water pipe with #4 (200a service) even if it is plastic where it leaves the house and into the ground.
250.104(A)(1) General. Metal water piping system(s) installed in or attached to a building or structure shall be bonded to the service equipment enclosure, the grounded conductor at the service, the grounding electrode conductor where of sufficient size, or to the one or more grounding electrodes used. The bonding jumper(s) shall be sized in accordance with Table 250.66 except as permitted in
and (A)(3)<multiple buildings>.
250 is a fun section that can get a doughnut fight going in an inspector meeting.