There is a 300 rule. Between 200 and 300 near misses there will be an accident.
How often are they pulling the cord out of the 3 prong base leavening it in the receptacle? Where I work at (manufacturing plant) they pull the ground pin out of the fan cords leavening them in the receptacles.
Our plant had a 4 hour seminar on how to plug and unplug something. The funny thing was it was all based on 110 plugs. At the end I asked about a twist lock and everyone just looked at me (220), don?t think any know what I was asking about except for the matinees workers.