EFFECTS CURRENT PASSING THROUGH THE HUMAN BODY 23
The hazard electric current primarily depends the value the current passing through
the human body and its duration. remainder felt nothing.
Figure 4. 0,5% could not let go.e.e.3
Influence frequencies [according IEC 479 (1974), First edition].e. 99,5% could not let go.e.1.
. The diagram may help in
the evaluation risks for different frequencies.
Curve Let-go-current for 0,5% the persons tested, i.e. remainder felt nothing. 50% could not let go.
Curve Threshold perception for 99,5% persons tested, i.
Description curves:
Curve Conventional limits for current values normally not giving rise any reaction. Important parameters regarding the risk electric shock,
besides the current and time aspects, are:
- frequency the current,
- resistance the human body (depending the frequency). Based
on publication the Association for the Advancement Medical Instrumentation
(AAMI) July 1971.
Curve Let-go-current for 99,5% the persons tested, i.
Curve Let-go-current for 50% the persons tested, i.
Curve Threshold perception for 50% persons tested, i
