Sizing GEC for outdoor dry-type xfmr

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wbalsam1

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Upper Jay, NY
iwire recently posted this on another thread and it got me to wondering something:

iwire said:
...Here a common power company requirement around pad mount transformers is four 3/4" x 10' ground rods at each corner of the pad, looped together with 4/0 bare cad welded to each rod with a 4/0 bare cad welded to the ring on each side running into the wiring compartment.
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Hers's my Q: How is the grounding electrode conductor sized for a primary transformer over 600 volts and a secondary of 120/240?
My only answer (so far) is Table 250.66 having to do with the size of the derived phase conductors of the SDS.
Help, please. :smile:
 
They're rod electrodes, so you really don't need anything bigger than #6. Number 6 is about the smallest you're going to be able to cadweld easily without fusing it off too.
 
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