Q. How is the grounding electrode conductor (GEC) sized when it’s to be connected to a concrete-encased electrode?
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A. If the GEC is connected to one or more concrete-encased electrodes, as permitted in Sec. 250.52(A)(3), the portion of the GEC that’s the sole connection to the concrete-encased electrode(s) isn’t required to be larger than 4 AWG copper [250.66(B)].