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Any ideas where the double-luggeds go?

Ah, yes, now for the scary part. If the double-lugged 10/2 NM went to a 30A fusible disconnect, it would be in violation, but not so bad, comparatively speaking.

It in fact went to a GE main-lug panel inside the house, with five 1p 20A breakers feeding lighting & appliance circuits, and two 1p 40A breakers feeding a dryer receptacle (no handle tie). [Linked Image]