If overcurrent protection is not provided at the source of a separately derived system, the grounding electrode conductor must be electrically isolated from the disconnecting means at the building or structure.

Question

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The grounding electrode conductor must be bonded to the system grounded conductor at the separately derived system. This ensures a low-impedance path for fault currents to facilitate the operation of overcurrent protective devices.

If Overcurrent Protection Is Not Provided at the Source of a Separately