PART III. GROUNDING ELECTRODE SYSTEM AND GROUNDING ELECTRODE CONDUCTOR
250.62 Grounding Electrode Conductor—Material.
The grounding electrode conductor, or its jumpers, can be solid or stranded, insulated or bare, and it must be copper, except aluminum is permitted if it is not subjected to corrosive conditions and not within 18 in. of the earth [250.64(A)]. Figure 250.111
The NEC doesn't require the identification of the grounding electrode conductor or grounding electrode bonding jumpers. Common practice is to either not identify the conductor at all, or to apply green marking tape.
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