If these separate buildings have distribution sub panels, fed from a main panel on another building, the only place where neutral and ground are bonded is at that main service entrance panel. Separate buildings do not bond neutral and ground but DO have individual water bond and ground rod connections to their sub panel's ground bus not neutral.

Todd

Drake Chamberlin - Electrical Energy wrote:

In this situation, the rods do not need to be bonded together in this
way.   The locations are separate.  In the wiring for buildings, a ground
rod is bonded to the neutral at the disconnect for the separate
structure.  A separate conductor connecting the rods would create a
parallel neutral path.

Drake

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