Trying to understand quads and when you would or would not use them. Correct me if I'm wrong here.
They obviously save space. They look like a bit like two tandems side-by-side, but arranged for balancing load (phase). It looks like they could be used for 4 single branch circuits, or 2 mwbc, or a pair of 240 circuits. The toggles for the outer pair or inner pair might be mechanically joined when used for 240 circuits, but all 4 are never joined. What else?