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Here's a panel in a house only 3 years old. Note the conductors around the buss bolts, they come from the generator disco which is NOT a DPDT, only a DPST, and it feeds the whole panel... Not clearly visible are six single pole 30A breakers feeding the #12 and #14 receptacles and lights feeders.

He wanted me to put an indicator light in before the main so he could tell when the power came back on...