Why are the sockets in hospital wards using this kind of jack?

Because this plug is the national standard regulations, so the hospital will be used, and a lot of equipment in the hospital, such as operating beds, ventilators, monitors, etc., if the use of other plugs, it will damage these devices, so the doctors are using this plug. Medical plugs are generally divided into three kinds, one has two plugs, one is three plugs, and one is a one-piece. There are two plugs, generally three-pronged plug, this plug can be used for a variety of equipment, such as operating beds, ventilators, etc.? Three-pronged plug, generally used in medical equipment, such as monitors, operating beds and so on.