what is the maximum current level a human body can withstand before sustaining injury

       LOW VOLTAGE HAZARD

     Why Low Voltage is considered more dangerous than H.V?

            Generally electric hazard occurs due to low voltage, rather than high voltage because high voltages are inaccessible as they give warning to approaching persons prior to contact due to their electrostatic fields. But low voltages give no such warning and are felt only when they are
approached or touched. Therefore, low voltages are considered more dangerous than high voltages.   

        Effects of current on human body according to its magnitude

	Magnitude	Effect
Low Currents	Upto 1 ma	No sensation
	1 to 8 ma	Sensation of shock
	8 to 15 ma	Painful shock
Medium current	15 to 20 ma	Loss of muscular control
	20 to 50 ma	Severe muscular contraction
High currents	50 to 100 ma	Probable heart failure
	100 to 200 ma	Heart failure certain
	Above 200 ma	Severe burns and muscular contraction

            At low currents person may let go himself of the circuit.

At medium currents (10 to 20 ma) the victim cannot let up himself of the circuit. The voltage required to produce such currents may be as low as 42 volts D.C or 110 volts A.C.