The greater the current inside the human body, the more obvious the physiological and pathological reactions of human beings, and the shorter the time causing ventricular fibrillation, the greater the fatal risk. According to the state of the human body, the current passing through the inside of the human body can be divided into three levels.
A. The minimum current that senses the current that the human body has sensed is called the perceived current. The average perceived current of the power frequency is 1.1MA for adult males, 0.7MA for adult females, and 5MA for direct current. Perceived current does not cause much damage to the body, but due to sudden stimulation, people may cause indirect accidents such as falling at high altitudes or at the water's edge or other dangerous environments.
B. Get rid of current The human body can get rid of the maximum current of the charged body after getting an electric shock to get rid of the current. The average frequency of power is getting rid of current, adult male 16MA; adult female 10MA; direct current is 50MA, children are smaller. This also has an important relationship with the form of electric shock.
C, lethal current (ventricular fibrillation current)
The minimum current that is life-threatening in a short period of time after a human body has an electric shock is called a lethal current (ventricular fibrillation current). Under normal circumstances, when the power frequency current of the human body exceeds 50MA, the heart will stop beating and there is a fatal danger. Experiments have shown that when the current is greater than 30MA, the heart will be at risk of ventricular fibrillation, so 30MA is another limit as a fatal current.
The leakage current of the leakage protector is also set to 30MA, which is the reason.
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