Don't have access to the FCOM right now, but as I remember it, the Gen 1 Line Pb isolates Gen 1 from the network apart from supplying the No 1 Fuel Pumps only in each tank.
The smoke procedure asks you, after you have taken certain measures but still have the smoke, to consider the Emerg Elec Config so you will end up taking both gennies off line, but with Gen 1 still supplying a fuel pump in each tank and the Emerg Gennie supplying the emergency network.
Hope that helps
mcdhu