I'm still confused. Both houses have grounds, so all circuits will have proper ground wiring.
The old house essentially becomes a subpanel of the new house at that point. So do sub panels need hot/neutral, AND ground connecting them? If so, why?
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No, It doesn't matter in the main panel. Yes, it matters in the sub panel. First, REMOVE the bonding strap that connects the two bus bars in the sub-panel. Then in the sub, it should be visually obvious that one of the bus bars is insulated from the case. If not, use a volt meter to find out. The insulated one is for neutral. The one that conducts to the case is ground.
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What is the purpose of removing the bonding in the sub, but not in the main panel?
Visuals probably helps explain these questions.