The issue is a parallel neutral situation or more correctly objectionable current on the grounding conductor. If you have multiple grounding points the EGC is paralleling the neutral. Since most PoCos will bond the metyer base the answer they used for years here was you nipple 3 wires into the service disconnect in PVC. Now the NEC has softened the language and says you can have line side bonding where the equipment is grouped but the MBJ is still in the service disconnect enclosure.
