National standard leakage current of medical equipment

You basically understand. The reason why electrical equipment enclosure requires good grounding is to protect personal safety, so it is called "safe grounding". When the bushing is well grounded, the leakage current of the equipment is introduced into the earth through the grounding wire, and the contact resistance of the human body is large, so that no current will pass through the human body. If the equipment shell is poorly grounded, the human body will touch the shell to form shunt, and when the current passing through the human body is large, it will get an electric shock. It should be noted that the safety regulations stipulate that the insulation voltage of electrical equipment to the ground should reach 1000v, that is, the leakage current should be less than 1 Ma. Your 20mA must be wrong.