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[patpappas]

A double wide trailer has one separate 125 amp main panel in each half, each half is fed from its own 125 amp disconnect switch on the outside of the trailer, both of these disconnects are feed from one 400 amp non fused disconnect switch (neutral pulled straight through) installed next to the utility meter socket. For the 125 amp disconnect breakers mounted outside of the double wide, should each disconnect be grounded to earth separately or together?

 

[barbeer]

250.58 Common Grounding Electrode.
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 effectively bonded together shall be considered as a single grounding electrode system in this sense.