If you have a multi unit dwelling (residential) with separate services (existing) and you do a panel changeout and it had no grounding per say. To bring up to code do you run all your grounds to 1 ground rod and water main or keep each service on their own ground rods and water mains (if several to bldg all existing) ??
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Where an ac system is connected to a grounding electrode in or at a building or structure, the same electrode shall be used to ground conductor enclosures and equipment in or on that building or structure. Where separate services, feeders, or branch circuits supply a building and are required to be connected to a grounding electrode(s), the same grounding electrode(s) shall be used.
Two or more grounding electrodes that are bonded together shall be considered as a single grounding electrode system in this sense.