As goofy as it sounds to say it, I have found more of this type of garbage work than I ever care to mention. My favourite so far was finding a ten gauge wire attached to the main feeder bus of a 1200A distribution panel/cabinet affair.
It is an old piece of equipment with sections for breakers of various sizes depending on the section you are looking at. It was fed by bus duct and if you remove the front covers the three main buses are right there at the bottom running laterally along the length. Wide open, no blast shields or covering of any kind. This thing is built like a dining room buffet cabinet(about 8 feet long) rather than being upright like an I-line or Spectra panel. Anyway, it is old and dangerous but what is worse is the wire I found. Some genius had drilled and tapped the bus and put a copper grounding lug on it and then attached a 10 gauge wire to it and ran it over to a motor control cabinet and attached it to a tiny little box switch. It ran exit lights or something. Anyway, I would not have want to be near that wire connection if it ever shorted out. That tenner would have evapourated like boiling water during a dead short. Geez, I always like following up brother "electricians" who do this ****.