DeltaDave
New Member
Out of curiosity, I saw a 120v subpanel, next to the main panel, where the subpanel circuit neutrals and grounds remained in the main panel (bonded). The subpanel is grounded to the main panel by a 6" metal conduit. A 60 amp double pole breaker in the main panel feeds the sub and the sub has a few 20 amp breakers in it for separate new circuits in the building. I know the NEC requires separate neutral and ground bars in a subpanel. WHY does the NEC not allow neutrals and grounds for a subpanel to stay in the main panel when it is on the same building?