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