I wish to install a line from the generator to a sub-panel that has disconnect. The sub-panel feeds the whole house. The line would use a 30amp CB with interlock kit. The sub-panels ground and neutrals are separate, should the generator have a bonded neutral or a floating neutral?
The generator must have a floating neutral. This arrangement will rely on the neutral-ground bond at the main panel. You don't want two neutral-ground bonds in the system.
FYI to readers: with subpanels, the feeder between main and subpanel must be 4-wire with separate neutral and ground, and the neutrals isolated in the subpanel. We are talking North America (from context) in this conversation.