Effect of Electric Current on Human Body

At first Bruner (1967) states that "The threshold of perception  of electric shock is about 1 mA." At this level a tingling sensation is felt by the subject when there is a contact with an electrified object through skin. If the magnitude of electric increase the sensation of tingling gives way to contraction of muscles. The muscular contraction increase as current is increase. Finally a value current is reached at a point that the subject cannot release his grip on the current carrying conductor.
The maximum current at which the subject is still capable of releasing a conductor by using muscles directly simulated by the current is called LET GO CURRENT.
The value of this current is significant as an individual can withstand  without serious after effects, repeated exposures to his LET GO CURRENT for at least the time required for him to release the conductor.  Currents slightly in excess of LET GO CURRENT would not permit the individual to release his grip from the current carrying conductor.
Based on the experiment conducted on male and female it is generally accepted that the safe LET GO CURRENT approximately 9 mA for male and 6 mA for female.
At current level higher than the LET GO CURRENT the subject loses ability to control his own muscle actions and he/she unable to release grip on current carrying conductor. These currents are very painful. This type of accident called HOLD ON TYPE accident. current rage for this type accident is about 20-100 mA. These type of accident may cause physical injury due to powerful contraction of the skeletal muscles. the heart and respiration function usually continue because of uniform spread of current through out the whole body.
If current contract intact skin and passes through trunk ( about 100 mA or above) there is a likelihood of pulling the heart into ventricular fibrillation. In this accident the rhythmic action of heart ceases, pumping actions may stops and the pulse disappear.  the brain begins to die as it is robbed of its supply of oxygenated blood.
At a very high Currents is about 6 A or above, there is a danger of temporary respiratory paralysis and also of serious burns.
The tolerable current for human body man to man may vary. this reports is just got from many experiments.