Question: The smallest size grounding electrode conductor connected to a ground ring from a 2 2 5 - A , main breaker service panelboard is _

The smallest size grounding electrode conductor connected to a ground ring from a 225-A, main breaker service panelboard is ___ AWG. The service panelboard is fed with four 4/0 AWG conductors and the ground ring is a 2 AWG copper conductor.

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