The bottom pic in your first post is a meter base. Is it on the end of the house near the 100 amp panel? Is there another meter base somewhere else on your house that has a meter in it? If so, I bet it feeds the 200 amp panel.....and somehow the 200 amp panel feeds the 100 amp panel since the empty meter base no longer does. I'd about bet that the wires that come from the bottom lugs of the unused meter base still go into the 100 amp panel, and are just taped up and pushed to the side. If they are still hooked up to the main breaker in the 100 amp panel, they are hot all the time if the 100 amp panel is fed by one of the lower breakers. As long as there is a metal cover for that old meter base, and a glass or plastic cover for the hole where the meter goes, it will be safe. If there is no glass or plastic cover for the vacant meter hole, I will be glad to send you one if you want it. All it does is keeps birds from building nests in the box, or nosey little boys from sticking their fingers in there and getting bit if it's hot! :eek:
