dont laugh a buddy of mine did something like this the next owner of
his house will have to do a complete rewire.

he is a electrical engineer, retired, but plays fast and loose using
110 outlets for 220, and other nasties, like knob and tube, and 14
gauge wiring on 30 amp fuses.

he has a quaint idea, each floor should be on one fuse, so 220 doesnt
appear anywhere upstairs. he fails to realize 2 seperate failures would
have to occur at the same time, to generate 220 across 2 legs and
expose a person.